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d a t a sh eet product speci?cation file under integrated circuits, ic06 september 1993 integrated circuits 74hc/hct4538 dual retriggerable precision monostable multivibrator for a complete data sheet, please also download: the ic06 74hc/hct/hcu/hcmos logic family specifications the ic06 74hc/hct/hcu/hcmos logic package information the ic06 74hc/hct/hcu/hcmos logic package outlines
september 1993 2 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 features separate reset inputs triggering from leading or trailing edge output capability: standard i cc category: msi power-on reset on-chip general description the 74hc/hct4538 are high-speed si-gate cmos devices and are pin compatible with 4538 of the 4000b series. they are specified in compliance with jedec standard no. 7a. the 74hc/hct4538 are dual retriggerable-resettable monostable multivibrators. each multivibrator has an active low trigger/retrigger input (n a 0 ), an active high trigger/retrigger input (na 1 ) , an overriding active low direct reset input (n r d ), an output (nq) and its complement (n q), and two pins (nc tc and nrc tc ) for connecting the external timing components c t and r t . typical pulse width variation over temperature range is 0.2%. the 4538 may be triggered by either the positive or the negative edges of the input pulse. the duration and accuracy of the output pulse are determined by the external timing components c t and r t . the output pulse width (t) is equal to 0.7 r t c t . the linear design techniques guarantee precise control of the output pulse width. a low level at n r d terminates the output pulse immediately. schmitt-trigger action in the trigger inputs makes the circuit highly tolerant to slower rise and fall times. quick reference data gnd = 0 v; t amb = 25 c; t r = t f = 6 ns notes 1. c pd is used to determine the dynamic power dissipation (p d in m w): p d = c pd v cc 2 f i +? (c l v cc 2 f o ) + + 0.48 c ext v cc 2 f o + d 0.8 v cc where: f i = input frequency in mhz f o = output frequency in mhz ? (c l v cc 2 f o ) = sum of outputs c l = output load capacitance in pf v cc = supply voltage in v d = duty factor in % c ext = timing capacitance in pf 2. for hc the condition is v i = gnd to v cc for hct the condition is v i = gnd to v cc - 1.5 v ordering information see 74hc/hct/hcu/hcmos logic package information . symbol parameter conditions typical unit hc hct t phl / t plh propagation delay n a 0 ,na 1 to nq, n qc l = 15 pf; v cc = 5 v 27 30 ns c i input capacitance 3.5 3.5 pf c pd power dissipation capacitance per multivibrator notes 1 and 2 136 138 pf
september 1993 3 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 pin description pin no. symbol name and function 1, 15 1c tc ,2c tc external capacitor connections 2, 14 1rc tc , 2rc tc external resistor/capacitor connections 3, 13 1 r d ,2 r d direct reset inputs (active low) 4, 12 1a 1 ,2a 1 trigger inputs (low-to-high, edge-triggered) 5, 11 1 a 0 ,2 a 0 trigger inputs (high-to-low, edge-triggered) 6, 10 1q, 2q pulse outputs 7, 9 1 q, 2 q complementary pulse outputs 8 gnd ground (0 v) 16 v cc positive supply voltage fig.1 pin configuration. fig.2 logic symbol. fig.3 iec logic symbol.
september 1993 4 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 fig.4 functional diagram. fig.5 connection of the external timing components r t and c t . (1) connect c tc (pins 1 and 15) to gnd (pin 8). function table notes 1. h = high voltage level l = low voltage level x = dont care - = low-to-high transition = high-to-low transition = one high level output pulse = one low level output pulse inputs outputs n a 0 na 1 n r d nq n q lh h - h xx l lh fig.6 timing diagram. (1) positive edge triggering. (2) positive edge retriggering (pulse lengthening). (3) negative edge triggering. (4) reset (pulse shortening). (5) v ref1 and v ref2 are internal reference voltages. (6) t = 0.7 r t c t (see also fig.5).
september 1993 5 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 handbook, full pagewidth mba338 v ref2 ref1 v gnd nc tc nrc tc enable enable v cc power - on reset v cc nr d na 1 na 0 nq nq fig.7 logic diagram (v ref1 and v ref2 are internal reference voltages).
september 1993 6 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 dc characteristics for 74hc for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: standard i cc category: msi ac characteristics for 74hc gnd = 0 v; t r = t f = 6 ns; c l = 50 pf symbol parameter t amb ( c) unit test conditions 74hc v cc (v) other + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max. t plh propagation delay n a 0 ,na 1 to nq 85 31 25 265 53 45 330 66 56 400 80 68 ns 2.0 4.5 6.0 fig.8 t phl propagation delay n a 0 ,na 1 to n q 83 30 24 265 53 45 330 66 56 400 80 68 ns 2.0 4.5 6.0 fig.8 t phl propagation delay n r d to nq 80 29 23 265 53 45 330 66 56 400 80 68 ns 2.0 4.5 6.0 fig.8 t plh propagation delay n r d to n q 83 30 24 265 53 45 340 68 58 400 80 68 ns 2.0 4.5 6.0 fig.8 t thl / t tlh output transition time 19 7 6 75 15 13 95 19 16 110 22 19 ns 2.0 4.5 6.0 fig.8 t w n a 0 pulse width low 80 16 14 17 6 5 100 20 17 120 24 20 ns 2.0 4.5 6.0 fig.8 t w na 1 pulse width high 80 16 14 17 6 5 100 20 17 120 24 20 ns 2.0 4.5 6.0 fig.8 t w n r d pulse width low 80 16 14 19 7 6 100 20 17 120 24 20 ns 2.0 4.5 6.0 fig.8 t w nq, n q pulse width high or low 0.63 0.70 0.77 0.602 0.798 0.595 0.805 ms 5.0 fig.8; r t = 10 k w ; c t = 0.1 m f t rem removal time r d to n a 0 ,na 1 35 7 6 6 2 2 45 9 8 55 11 9 ns 2.0 4.5 6.0 fig.8
september 1993 7 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 non-standard dc characteristics for 74hc voltages are referenced to gnd (ground = 0 v) note 1. this measurement can only be carried out after a trigger pulse is applied. t rt retrigger time n a 0 ,na 1 - - - 455+x 80+x 55+x - - - - - - ns 2.0 4.5 6.0 fig.8 x=c ext / (4.5 v cc ) r ext external timing resistor 10 2 1000 1000 k w 2.0 5.0 c ext external timing capacitor no limits pf 5.0 symbol parameter t amb ( c) unit test conditions 74hc v cc (v) v i (v) other + 25 - 40 to + 85 - 40 to + 125 min. typ max. min. max. min. max. i i input leakage current nrc ext 0.5 5.0 10.0 m a 6.0 2.0 or gnd v cc or gnd; note 1 symbol parameter t amb ( c) unit test conditions 74hc v cc (v) other + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max.
september 1993 8 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 dc characteristics for 74hct for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: standard i cc category: msi note to hct types the value of additional quiescent supply current ( d i cc ) for a unit load of 1 is given in the family specifications. to determine d i cc per input, multiply this value by the unit load coefficient shown in the table below. ac characteristics for 74hct gnd = 0 v; t r = t f = 6 ns; c l = 50 pf input unit load coefficient n a 0 ,na 1 n r d 0.50 0.65 symbol parameter t amb ( c) unit test conditions 74hct v cc (v) other + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max. t plh propagation delay n a 0 ,na 1 to nq 35 60 75 90 ns 4.5 fig.8 t phl propagation delay n a 0 ,na 1 to n q 35 60 75 90 ns 4.5 fig.8 t phl propagation delay n r d to nq 35 60 75 90 ns 4.5 fig.8 t plh propagation delay n r d to n q 35 60 75 90 ns 4.5 fig.8 t thl / t tlh output transition time 7 15 19 21 ns 4.5 fig.8 t w n a 0 pulse width low 20 11 25 30 ns 4.5 fig.8 t w na 1 pulse width high 16 5 20 24 ns 4.5 fig.8 t w n r d pulse width low 20 11 25 30 ns 4.5 fig.8 t w nq, n q pulse width high or low 0.63 0.70 0.77 0.602 0.798 0.595 0.805 ms 5.0 fig.8; r t = 10 k w ; c t = 0.1 m f t rem removal time r d to n a 0 , na1 7 2 9 11 ns 4.5 fig.8 t rt retrigger time n a 0 ,na 1 - 80+x -- ns 4.5 fig.8 x=c ext / (4.5 v cc ) r ext external timing resistor 2 1000 k w 5.0 c ext external timing capacitor no limits pf 5.0
september 1993 9 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 non-standard dc characteristics for 74hct voltages are referenced to gnd (ground = 0 v) note 1. this measurement can only be carried out after a trigger pulse is applied. ac waveforms symbol parameter t amb ( c) unit test conditions 74hct v cc (v) v i (v) other + 25 - 40 to + 85 - 40 to + 125 min. typ max. min. max. min. max. i i input leakage current nrc ext 0.5 5.0 10.0 m a 5.5 2.0 or gnd v cc or gnd; note 1 fig.8 waveforms showing the input (na 1 ,n a 0 ,n r d ) to output (nq, n q) propagation delays, the output transition times, the input and output pulse widths, the removal time from direct reset (n r d ) to input (na 1 ,n a 0 ), and the input retrigger time. (1) hc : v m = 50%; v i = gnd to v cc . hct: v m = 1.3 v; v i = gnd to 3 v.
september 1993 10 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 application information fig.9 retriggerable monostable circuitry. (a) rising-edge triggered; (b) falling-edge triggered. (a) (b) fig.10 non-retriggerable monostable circuitry. (a) rising-edge triggered; (b) falling-edge triggered. (a) (b)
september 1993 11 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 fig.11 power-down protection circuit. power-down considerations a large capacitor (c x ) 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 through the input protection diodes. to avoid this possibility, use a damping diode (d x ) preferably a germanium or schottky type diode able to withstand large current surges and connect as shown in fig.11. fig.12 typical pulse width accuracy versus external capacitance; v cc = 4.5 v; t amb = 25 c. fig.13 typical pulse width accuracy versus external resistance; v cc = 4.5 v; t amb = 25 c.
september 1993 12 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 fig.14 typical pulse width accuracy versus external capacitance; r ext = 10 k w ;v cc = 4.5 v; t amb = 25 c. fig.15 typical pulse width accuracy versus power supply; c ext = 1 nf; t amb = 25 c. fig.16 typical pulse width accuracy versus power supply; c ext = 100 nf; t amb = 25 c.
september 1993 13 philips semiconductors product speci?cation dual retriggerable precision monostable multivibrator 74hc/hct4538 package outlines see 74hc/hct/hcu/hcmos logic package outlines . fig.17 typical pulse width accuracy versus temperature; c ext = 1 nf; v cc = 4.5 v. fig.18 typical pulse width accuracy versus temperature; c ext =1 m f; v cc = 4.5 v.

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