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1. general description the 74hc123; 74hct123 are high-speed si-g ate cmos devices and are pin compatible with low-power schottky ttl (lsttl). they are specified in co mpliance with jedec standard no. 7a. the 74hc123; 74hct123 are dual retriggerabl e monostable multivib rators with output pulse width control by three methods: 1. the basic pulse is programmed by se lection of an external resistor (r ext ) and capacitor (c ext ). 2. once triggered, the basic output pulse width may be extended by retriggering the gated active low-going edge input (na ) or the active high-going edge input (nb). by repeating this process, the ou tput pulse period (nq = high, nq = low) can be made as long as desired. alternatively an output delay can be terminated at any time by a low-going edge on input nrd , which also inhibits the triggering. 3. an internal connection from nrd to the input gates makes it possible to trigger the circuit by a high-going signal at input nrd as shown in the function table. schmitt-trigger action in the na and nb inputs, makes the circuit highly tolerant to slower input rise and fall times. the 74hc123; 74hct123 are identical to the 74hc423; 74hct423 but can be triggered via the reset input. 2. features and benefits ? dc triggered from active high or active low inputs ? retriggerable for very long pulses up to 100 % duty factor ? direct reset terminates output pulse ? schmitt-trigger action on all inputs except for the reset input ? esd protection: ? hbm jesd22-a114f exceeds 2000 v ? mm jesd22-a115-a exceeds 200 v ? specified from ? 40 ? cto+85 ? c and from ? 40 ? cto+125 ? c 74hc123; 74hct123 dual retriggerable monostab le multivibrator with reset rev. 7 ? 25 august 2011 product data sheet
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 2 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 3. ordering information 4. functional diagram table 1. ordering information type number package temperature range name description version 74hc123n ? 40 ? c to +125 ? c dip16 plastic dual in-line package; 16 leads (300 mil) sot38-4 74hct123n 74hc123d ? 40 ? c to +125 ? c so16 plastic small outline package; 16 leads; body width 3.9 mm sot109-1 74hct123d 74hc123db ? 40 ? c to +125 ? c ssop16 plastic shrink small outline package; 16 leads; body width 5.3 mm sot338-1 74hct123db 74hc123pw ? 40 ? c to +125 ? c tssop16 plastic thin shrink small outline package; 16 leads; body width 4.4 mm sot403-1 74hct123pw 74HC123BQ ? 40 ? c to +125 ? c dhvqfn16 plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; 16 terminals; body 2.5 ? 3.5 ? 0.85 mm sot763-1 fig 1. functional diagram 1q q 2rd rd s 13 1rext/cext 15 1cext 14 1q q 4 9 001aaa610 1rd 2a 1 1a 10 2b 2 11 3 1b t q rd s 2rext/cext 7 2cext 6 2q 5 q 2q 12 t
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 3 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset fig 2. logic symbol fig 3. iec logic symbol 1q q 2rd rd s 2rext/cext 13 7 1rext/cext 15 2cext 6 1cext 14 2q 5 1q q 4 2q 12 9 mna515 1rd 2a 11a 10 2b 2 11 3 1b t mna516 cx & 6 5 12 rcx r 7 9 11 10 cx & 14 13 4 rcx r 15 1 3 2 fig 4. logic diagram mna518 nrext/cext v cc v cc v cc r nrd na nb r cl cl cl cl cl nq nq r r
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 4 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 5. pinning information 5.1 pinning 5.2 pin description (1) the die substrate is attached to this pad using conductive die attach mate rial. it can not be used as supply pin or input. fig 5. pin configuration for dip16, so16, ssop16 and tssop16 fig 6. pin configuration for dhvqfn16 74hc123 74hct123 1a v cc 1b 1rext/cext 1rd 1cext 1q 1q 2q 2q 2cext 2rd 2rext/cext 2b gnd 2a 001aaa698 1 2 3 4 5 6 7 8 10 9 12 11 14 13 16 15 001aaf046 74hc123 2rext/cext 2b 2cext 2rd 2q 2q 1q 1q 1rd 1cext 1b 1rext/cext gnd 2a 1a v cc transparent top view 7 10 6 11 5 12 4 13 3 14 2 15 8 9 1 16 terminal 1 index area v cc (1) table 2. pin description symbol pin description 1a 1 negative-edge triggered input 1 1b 2 positive-edge triggered input 1 1rd 3 direct reset low and posit ive-edge triggered input 1 1q 4 active low output 1 2q 5 active high output 2 2cext 6 external capacitor connection 2 2rext/cext 7 external resistor and capacitor connection 2 gnd 8 ground (0 v) 2a 9 negative-edge triggered input 2 2b 10 positive-edge triggered input 2 2rd 11 direct reset low and posit ive-edge triggered input 2 2q 12 active low output 2 1q 13 active high output 1 1cext 14 external capacitor connection 1 1rext/cext 15 external resistor and capacitor connection 1 v cc 16 supply voltage
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 5 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 6. functional description [1] h = high voltage level; l = low voltage level; x = don?t care; ? = low-to-high transition; ? = high-to-low transition; = one high level output pulse; = one low level output pulse. [2] if the monostable was triggered before this condition was established, the pulse will continue as programmed. 7. limiting values [1] for dip16 package: p tot derates linearly with 12 mw/k above 70 ? c. [2] for so16 package: p tot derates linearly with 8 mw/k above 70 ? c. [3] for ssop16 and tssop16 packages: p tot derates linearly with 5.5 mw/k above 60 ? c. [4] for dhvqfn16 package: p tot derates linearly with 4.5 mw/k above 60 ? c. table 3. function table [1] input output nrd na nb nq nq l xxl h xhxl [2] h [2] xxl l [2] h [2] hl ? h ? h ? lh table 4. limiting values in accordance with the absolute maximum rating system (iec 60134). voltages are referenced to gnd (ground = 0 v). symbol parameter conditions min max unit v cc supply voltage ? 0.5 +7 v i ik input clamping current v i < ? 0.5 v or v i >v cc + 0.5 v - ? 20 ma i ok output clamping current v o < ? 0.5 v or v o > v cc + 0.5 v - ? 20 ma i o output current except for pins nrext/cext; v o = ? 0.5 v to (v cc +0.5v) - ? 25 ma i cc supply current - 50 ma i gnd ground current - ? 50 ma t stg storage temperature ? 65 +150 ?c p tot total power dissipation dip16 package [1] - 750 mw so16 package [2] - 500 mw ssop16 package [3] - 500 mw tssop16 package [3] - 500 mw dhvqfn16 package [4] - 500 mw
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 6 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 8. recommended operating conditions 9. static characteristics table 5. recommended operating conditions symbol parameter conditions 74hc123 74hct123 unit min typ max min typ max v cc supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 v v i input voltage 0 - v cc 0-v cc v v o output voltage 0 - v cc 0-v cc v ? t/ ? v input transition rise and fall rate nrd input v cc = 2.0 v - - 625 - - - ns/v v cc = 4.5 v - 1.67 139 - 1.67 139 ns/v v cc = 6.0 v - - 83 - - - ns/v t amb ambient temperature ? 40 +25 +125 ? 40 +25 +125 ?c table 6. static characteristics at recommended operating conditions; volt ages are referenced to gnd (ground = 0 v). symbol parameter conditions 25 ?c ? 40 ?c to +85 ? c ? 40 ? c to +125 ?c unit min typ max min max min max 74hc123 v ih high-level input voltage v cc = 2.0 v 1.5 1.2 - 1.5 - 1.5 - v v cc = 4.5 v 3.15 2.4 - 3.15 - 3.15 - v v cc = 6.0 v 4.2 3.2 - 4.2 - 4.2 - v v il low-level input voltage v cc = 2.0 v - 0.8 0.5 - 0.5 - 0.5 v v cc = 4.5 v - 2.1 1.35 - 1.35 - 1.35 v v cc = 6.0 v - 2.8 1.8 - 1.8 - 1.8 v v oh high-level output voltage v i =v ih or v il i o = ? 20 ? a; v cc = 2.0 v 1.9 2.0 - 1.9 - 1.9 - v i o = ? 20 ? a; v cc = 4.5 v 4.4 4.5 - 4.4 - 4.4 - v i o = ? 20 ? a; v cc = 6.0 v 5.9 6.0 - 5.9 - 5.9 - v i o = ? 4ma; v cc = 4.5 v 3.98 4.32 - 3.84 - 3.7 - v i o = ? 5.2 ma; v cc = 6.0 v 5.48 5.81 - 5.34 - 5.2 - v v ol low-level output voltage v i =v ih or v il i o =20 ? a; v cc = 2.0 v - 0 0.1 - 0.1 - 0.1 v i o =20 ? a; v cc = 4.5 v - 0 0.1 - 0.1 - 0.1 v i o =20 ? a; v cc = 6.0 v - 0 0.1 - 0.1 - 0.1 v i o =4ma; v cc = 4.5 v - 0.15 0.26 - 0.33 - 0.4 v i o = 5.2 ma; v cc = 6.0 v - 0.16 0.26 - 0.33 - 0.4 v i i input leakage current v i =v cc or gnd; v cc =6.0v - - ? 0.1 - ? 1.0 - ? 1.0 ? a i cc supply current v i =v cc or gnd; i o =0a; v cc =6.0v - - 8.0 - 80 - 160 ? a
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 7 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset c i input capacitance -3.5- - - - - pf 74hct123 v ih high-level input voltage v cc = 4.5 v to 5.5 v 2.0 1.6 - 2.0 - 2.0 - v v il low-level input voltage v cc = 4.5 v to 5.5 v - 1.2 0.8 - 0.8 - 0.8 v v oh high-level output voltage v i =v ih or v il ; v cc =4.5v i o = ? 20 ? a 4.4 4.5 - 4.4 - 4.4 - v i o = ? 4 ma 3.98 4.32 - 3.84 - 3.7 - v v ol low-level output voltage v i =v ih or v il ; v cc =4.5v i o =20 ? a - 0 0.1 - 0.1 - 0.1 v i o = 4.0 ma - 0.15 0.26 - 0.33 - 0.4 v i i input leakage current v i =v cc or gnd; v cc =5.5v - - ? 0.1 - ? 1.0 - ? 1.0 ? a i cc supply current v i =v cc or gnd; i o =0a; v cc =5.5v - - 8.0 - 80 - 160 ? a ? i cc additional supply current per input pin; i o =0a; v i =v cc ? 2.1 v; other inputs at v cc or gnd; v cc = 4.5 v to 5.5 v pins na , nb - 35 125 - 160 - 170 ? a pin nrd - 50 180 - 225 - 245 ? a c i input capacitance -3.5- - - - - pf table 6. static characteristics ?continued at recommended operating conditions; volt ages are referenced to gnd (ground = 0 v). symbol parameter conditions 25 ?c ? 40 ?c to +85 ? c ? 40 ? c to +125 ?c unit min typ max min max min max
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 8 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 10. dynamic characteristics table 7. dynamic characteristics voltages are referenced to gnd (ground = 0 v); c l = 50 pf unless otherwise specified; for test circuit see figure 12 . symbol parameter conditions 25 ?c ? 40 ? c to +85 ?c ? 40 ? c to +125 ?c unit min typ max min max min max 74hc123 t pd propagation delay nrd , na , nb to nq or nq ; c ext = 0 pf; r ext =5k ? ; see figure 9 [1] v cc = 2.0 v - 83 255 - 320 - 385 ns v cc = 4.5 v - 30 51 - 64 - 77 ns v cc = 5 v; c l = 15 pf - 26 - - - - - ns v cc = 6.0 v - 24 43 - 54 - 65 ns nrd (reset) to nq or nq ; c ext =0pf; r ext =5k ? ; see figure 9 v cc = 2.0 v - 66 215 - 270 - 325 ns v cc = 4.5 v - 24 43 - 54 - 65 ns v cc = 5 v; c l = 15 pf - 20 - - - - - ns v cc = 6.0 v - 19 37 - 46 - 55 ns t t transition time see figure 9 [1] v cc = 2.0 v - 19 75 - 95 - 110 ns v cc = 4.5 v - 7 15 - 19 - 22 ns v cc = 6.0 v - 6 13 - 16 - 19 ns t w pulse width na low; see figure 10 v cc = 2.0 v 100 8 - 125 - 150 - ns v cc = 4.5 v 20 3 - 25 - 30 - ns v cc = 6.0 v 17 2 - 21 - 26 - ns nb high; see figure 10 v cc = 2.0 v 100 17 - 125 - 150 - ns v cc = 4.5 v 20 6 - 25 - 30 - ns v cc = 6.0 v 17 5 - 21 - 26 - ns nrd low; see figure 11 v cc = 2.0 v 100 14 - 125 - 150 - ns v cc = 4.5 v 20 5 - 25 - 30 - ns v cc = 6.0 v 17 4 - 21 - 26 - ns nq high and nq low; v cc =5.0v; see figure 10 and 11 [2] c ext = 100 nf; r ext = 10 k ? -450- - - - - ? s c ext = 0 pf; r ext =5k ? -75- - - - -ns
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 9 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset t rtrig retrigger time na ,nb; c ext = 0 pf; r ext = 5 k ? ; v cc = 5.0 v; see figure 10 [3] [4] -110- - - - - ns r ext external timing resistor see figure 7 v cc = 2.0 v 10 - 1000 - - - - k ? v cc = 5.0 v 2 - 1000 - - - - k ? c ext external timing capacitor v cc = 5.0 v; see figure 7 [4] --- - - - -pf c pd power dissipation capacitance per monostable; v i = gnd to v cc [5] -54- - - - -pf 74hct123 t phl high to low propagation delay nrd , na , nb to nq or nq ; c ext = 0 pf; r ext = 5k ? ; see figure 9 v cc = 4.5 v - 30 51 - 64 - 77 ns v cc = 5 v; c l =15pf - 26 - - - - - ns nrd (reset) to nq or nq ; c ext =0pf; r ext =5k ? ; see figure 9 v cc = 4.5 v - 27 46 - 58 - 69 ns v cc = 5 v; c l =15pf - 23 - - - - - ns t plh low to high propagation delay nrd , na , nb to nq or nq ; c ext = 0 pf; r ext =5k ? ; see figure 9 v cc = 4.5 v - 28 51 - 64 - 77 ns v cc = 5 v; c l =15pf - 26 - - - - - ns nrd (reset) to nq or nq ; c ext =0pf; r ext = 5k ? ; see figure 9 v cc = 4.5 v - 23 46 - 58 - 69 ns v cc = 5 v; c l =15pf - 23 - - - - - ns t t transition time v cc = 4.5 v; see figure 9 [1] - 7 15 - 19 - 22 ns table 7. dynamic characteristics ?continued voltages are referenced to gnd (ground = 0 v); c l = 50 pf unless otherwise specified; for test circuit see figure 12 . symbol parameter conditions 25 ?c ? 40 ? c to +85 ?c ? 40 ? c to +125 ?c unit min typ max min max min max
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 10 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset [1] t pd is the same as t phl and t plh ; t t is the same as t thl and t tlh [2] for other r ext and c ext combinations see figure 7 . if c ext > 10 nf, the next formula is valid. t w =k ? r ext ? c ext , where: t w = typical output pulse width in ns; r ext = external resistor in k ? ; c ext = external capacitor in pf; k = constant = 0.45 for v cc = 5.0 v and 0.55 for v cc =2.0v. the inherent test jig and pin capacitance at pins 15 and 7 (nrext/cext) is approximately 7 pf. [3] the time to retrigger the monostable multivibrator depends on the values of r ext and c ext . the output pulse width will only be extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. if c ext >10 pf, the next formula (at v cc = 5.0 v) for the setup time of a retrigger pulse is valid: t rtrig = 30 + 0.19 ? r ext ? c ext 0.9 +13 ? r ext 1.05 , where: t rtrig = retrigger time in ns; c ext = external capacitor in pf; r ext = external resistor in k ? . the inherent test jig and pin capacitance at pins 15 and 7 (nrext/cext) is 7 pf. [4] when the device is powered-up, initiate the device via a reset pulse, when c ext <50pf. [5] c pd is used to determine the dynamic power dissipation (p d in ? w). p d =c pd ? v cc 2 ? f i + ? (c l ? v cc 2 ? f o ) + 0.75 ? c ext ? v cc 2 ? f o +d ? 16 ? v cc where: f i = input frequency in mhz; f o = output frequency in mhz; d = duty factor in %; c l = output load capacitance in pf; v cc = supply voltage in v; c ext = timing capacitance in pf; ? (c l ? v cc 2 ? f o ) sum of outputs. t w pulse width v cc = 4.5 v na low; see figure 10 20 3 - 25 - 30 - ns nb high; see figure 10 20 5 - 25 - 30 - ns nrd low; see figure 11 20 7 - 25 - 30 - ns nq high and nq low; v cc =5.0v; see figure 10 and 11 [2] c ext = 100 nf; r ext = 10 k ? -450- - - - - ? s c ext = 0 pf; r ext =5k ? -75- - - - -ns t rtrig retrigger time na ,nb; c ext = 0 pf; r ext = 5 k ? ; v cc = 5.0 v; see figure 10 [3] [4] -110- - - - - ns r ext external timing resistor v cc = 5.0 v; see figure 7 2-1000- - - -k ? c ext external timing capacitor v cc = 5.0 v; see figure 7 [4] --- - - - -pf c pd power dissipation capacitance per monostable; v i = gnd to v cc [5] -56- - - - -pf table 7. dynamic characteristics ?continued voltages are referenced to gnd (ground = 0 v); c l = 50 pf unless otherwise specified; for test circuit see figure 12 . symbol parameter conditions 25 ?c ? 40 ? c to +85 ?c ? 40 ? c to +125 ?c unit min typ max min max min max
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 11 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset v cc = 5.0 v; t amb = 25 ? c. (1) r ext = 100 k ? (2) r ext = 50 k ? (3) r ext = 10 k ? (4) r ext = 2 k ? c ext = 10 nf; r ext = 10 k ? to 100 k ? . t amb = 25 ? c. fig 7. typical output pulse width as a function of the external capacitor value fig 8. 74hc123 typical ?k? factor as function of v cc 001aaa611 10 3 10 2 10 5 10 4 10 6 t w (ns) 10 c ext (pf) 110 4 10 3 10 10 2 (2) (3) (4) (1) v cc (v) 08 6 24 001aaa612 0.4 0.2 0.6 0.8 'k' factor 0
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 12 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 11. waveforms measurement points are given in table 8 . v ol and v oh are typical voltage output levels that occur with the output load. fig 9. propagation delays from inputs (na , nb, nrd ) to outputs (nq, nq ) and output tr ansition times 001aaa771 nb input t w t w t plh v m v oh v m v m t w t plh t thl t w t phl t phl v m t w t plh na input nrd input nq output nq output v m t tlh v y v x v y v x t phl t phl t plh (reset) (reset) v ol v oh v ol v i v i v i gnd gnd gnd
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 13 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset nrd = high fig 10. output pulse control using retrigger pulse mna521 t w t w t w t w t w nb input na input nq output t rtrig na = low fig 11. output pulse control using reset input nrd mna522 t w t w t w nb input nrd input nq output
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 14 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset test data is given in table 8 . definitions test circuit: r t = termination resistance should be equal to output impedance z o of the pulse generator. c l = load capacitance including jig and probe capacitance. r l = load resistance. s1 = test selection switch. fig 12. test circuit for measuring switching times v m v m t w t w 10 % 90 % 0 v v i v i negative pulse positive pulse 0 v v m v m 90 % 10 % t f t r t r t f 001aad983 dut v cc v cc v i v o r t r l s1 c l open g table 8. test data type input load s1 position v i t r , t f c l r l t phl , t plh 74hc123 v cc 6 ns 15 pf, 50 pf 1 k ? open 74hct123 3 v 6 ns 15 pf, 50 pf 1 k ? open
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 15 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 12. application information 12.1 timing component connections the basic output pulse width is essentially determined by the values of the external timing components r ext and c ext . 12.2 power-up considerations when the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of r ext and c ext . this output pulse can be eliminated using the circuit shown in figure 14 . (1) for minimum noise generation it is recommended to ground pins 6 (2cext) and 14 (1cext) externally to pin 8 (gnd). fig 13. timing component connections 001aaa854 c ext r ext na nb v cc ncext nrd nrext/cext nq nq gnd 123 13 (5) 4 (12) 15 (7) 14 (6) 3 (11) 8 1 (9) 2 (10) (1) fig 14. power-up output pulse elimination circuit 001aaa613 v cc reset nrd c ext r ext na nb v cc ncext gnd nrext/cext nq nq 123 13 (5) 4 (12) 15 (7) 14 (6) 8 1 (9) 2 (10) 3 (11)
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 16 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 12.3 power-down considerations a large capacitor c ext may cause problems when powering-down the monostable due to the energy stored in this capacitor. when a system containing this device is powered-down or a rapid decrease of v cc to zero occurs, the monostable may sustain damage, due to the capacitor discharging thro ugh the input protection diodes. to avoid this possibility, use a damping diode (d ext ) preferably a germanium or schottky type diode able to withstand large current surges and connect as shown in figure 15 . fig 15. power-down protection circuit 001aaa614 d ext nrd c ext r ext na nb v cc ncext nrext/cext nq nq 123 13 (5) 4 (12) 15 (7) 1 (9) 2 (10) 3 (11) gnd 14 (6) 8
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 17 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 13. package outline fig 16. package outline sot38-4 (dip16) references outline version european projection issue date iec jedec jeita sot38-4 95-01-14 03-02-13 m h c (e ) 1 m e a l seating plane a 1 w m b 1 b 2 e d a 2 z 16 1 9 8 e pin 1 index b 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. unit a max. 12 b 1 (1) (1) (1) b 2 cd e e m z h l mm dimensions (inch dimensions are derived from the original mm dimensions) a min. a max. b max. w m e e 1 1.73 1.30 0.53 0.38 0.36 0.23 19.50 18.55 6.48 6.20 3.60 3.05 0.254 2.54 7.62 8.25 7.80 10.0 8.3 0.76 4.2 0.51 3.2 inches 0.068 0.051 0.021 0.015 0.014 0.009 1.25 0.85 0.049 0.033 0.77 0.73 0.26 0.24 0.14 0.12 0.01 0.1 0.3 0.32 0.31 0.39 0.33 0.03 0.17 0.02 0.13 dip16: plastic dual in-line package; 16 leads (300 mil) sot38-4
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 18 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset fig 17. package outline sot109-1 (so16) x w m a a 1 a 2 b p d h e l p q detail x e z e c l v m a (a ) 3 a 8 9 1 16 y pin 1 index unit a max. a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p qz ywv references outline version european projection issue date iec jedec jeita mm inches 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 10.0 9.8 4.0 3.8 1.27 6.2 5.8 0.7 0.6 0.7 0.3 8 0 o o 0.25 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. 1.0 0.4 sot109-1 99-12-27 03-02-19 076e07 ms-012 0.069 0.010 0.004 0.057 0.049 0.01 0.019 0.014 0.0100 0.0075 0.39 0.38 0.16 0.15 0.05 1.05 0.041 0.244 0.228 0.028 0.020 0.028 0.012 0.01 0.25 0.01 0.004 0.039 0.016 0 2.5 5 mm scale so16: plastic small outline package; 16 leads; body width 3.9 mm sot109-1
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 19 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset fig 18. package outline sot338-1 (ssop16) unit a 1 a 2 a 3 b p cd (1) e (1) eh e ll p qz ywv references outline version european projection issue date iec jedec jeita mm 0.21 0.05 1.80 1.65 0.25 0.38 0.25 0.20 0.09 6.4 6.0 5.4 5.2 0.65 1.25 7.9 7.6 1.03 0.63 0.9 0.7 1.00 0.55 8 0 o o 0.13 0.2 0.1 dimensions (mm are the original dimensions) note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. sot338-1 99-12-27 03-02-19 (1) w m b p d h e e z e c v m a x a y 1 8 16 9 a a 1 a 2 l p q detail x l (a ) 3 mo-150 pin 1 index 0 2.5 5 mm scale ssop16: plastic shrink small outline package; 16 leads; body width 5.3 mm sot338-1 a max. 2
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 20 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset fig 19. package outline sot403-1 (tssop16) unit a 1 a 2 a 3 b p cd (1) e (2) (1) eh e ll p qz ywv references outline version european projection issue date iec jedec jeita mm 0.15 0.05 0.95 0.80 0.30 0.19 0.2 0.1 5.1 4.9 4.5 4.3 0.65 6.6 6.2 0.4 0.3 0.40 0.06 8 0 o o 0.13 0.1 0.2 1 dimensions (mm are the original dimensions) notes 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. plastic interlead protrusions of 0.25 mm maximum per side are not included. 0.75 0.50 sot403-1 mo-153 99-12-27 03-02-18 w m b p d z e 0.25 18 16 9 a a 1 a 2 l p q detail x l (a ) 3 h e e c v m a x a y 0 2.5 5 mm scale tssop16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm sot403-1 a max. 1.1 pin 1 index
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 21 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset fig 20. package outline sot763-1 (dhvqfn16) terminal 1 index area 0.5 1 a 1 e h b unit y e 0.2 c references outline version european projection issue date iec jedec jeita mm 3.6 3.4 d h 2.15 1.85 y 1 2.6 2.4 1.15 0.85 e 1 2.5 0.30 0.18 0.05 0.00 0.05 0.1 dimensions (mm are the original dimensions) sot763-1 mo-241 - - - - - - 0.5 0.3 l 0.1 v 0.05 w 0 2.5 5 mm scale sot763-1 dhvqfn16: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; 16 terminals; body 2.5 x 3.5 x 0.85 mm a (1) max. a a 1 c detail x y y 1 c e l e h d h e e 1 b 27 15 10 9 8 1 16 x d e c b a terminal 1 index area ac c b v m w m e (1) note 1. plastic or metal protrusions of 0.075 mm maximum per side are not included. d (1) 02-10-17 03-01-27
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 22 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 14. abbreviations 15. revision history table 9. abbreviations acronym abbreviation cmos complementary metal oxide semiconductor dut device under test esd electrostatic discharge hbm human body model lsttl low-power schottky transistor-transistor logic mm machine model table 10. revision history document id release date data sheet status change notice supersedes 74hc_hct123 v.7 20110825 product data sheet - 74hc_hct123 v.6 modifications: ? waveform figure 9 updated (errata). 74hc_hct123 v.6 20110314 product data sheet - 74hc_hct123 v.5 74hc_hct123 v.5 20090713 product data sheet - 74hc_hct123 v.4 74hc_hct123 v.4 20060616 product data sheet - 74hc_hct123 v.3 74hc_hct123 v.3 20040511 product s pecification - 74hc_hct123_cnv v.2 74hc_hct123_cnv v.2 19980708 product specification - -
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 23 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset 16. legal information 16.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 16.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 16.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use in automotive applications ? this nxp semiconductors product has been qua lified for use in automotive applications. the product is not desi gned, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be ex pected to result in personal injury, death or severe property or environmental dam age. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification.
74hc_hct123 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 7 ? 25 august 2011 24 of 25 nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from national authorities. 16.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. 17. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors 74hc123; 74hct123 dual retriggerable monostable multivibrator with reset ? nxp b.v. 2011. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 25 august 2011 document identifier: 74hc_hct123 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 18. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 ordering information . . . . . . . . . . . . . . . . . . . . . 2 4 functional diagram . . . . . . . . . . . . . . . . . . . . . . 2 5 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 5.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 6 functional description . . . . . . . . . . . . . . . . . . . 5 7 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 recommended operating conditions. . . . . . . . 6 9 static characteristics. . . . . . . . . . . . . . . . . . . . . 6 10 dynamic characteristics . . . . . . . . . . . . . . . . . . 8 11 waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12 application information. . . . . . . . . . . . . . . . . . 15 12.1 timing component connections . . . . . . . . . . . 15 12.2 power-up considerations . . . . . . . . . . . . . . . . 15 12.3 power-down considerations . . . . . . . . . . . . . . 16 13 package outline . . . . . . . . . . . . . . . . . . . . . . . . 17 14 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 22 15 revision history . . . . . . . . . . . . . . . . . . . . . . . . 22 16 legal information. . . . . . . . . . . . . . . . . . . . . . . 23 16.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 23 16.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 16.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 16.4 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 24 17 contact information. . . . . . . . . . . . . . . . . . . . . 24 18 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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