1/9 august 2001 n high speed: t pd = 12ns (typ.) at v cc = 4.5v n low power dissipation: i cc = 4 m a(max.) at t a =25c n compatible with ttl outputs : v ih = 2v (min.) v il = 0.8v (max) n balanced propagation delays: t plh @ t phl n symmetrical output impedance: |i oh | = i ol = 6ma (min) n pin and function compatible with 74 series 540 description the 74hct540 is an advanced high-speed cmos octal bus buffer (3-state) fabricated with silicon gate c 2 mos technology. the m74hct540 is an inverting buffer. the 3-state control gate operates as a two input and such that if either g1 and g2 are high, all eight output are in the high impedance state. in order to enhance pc board layout the m74hct540 offer a pinout having inputs and outputs on opposite sides of the package. the m74hct540 is designed to directly interface hsc 2 mos systems with ttl and nmos components. all inputs are equipped with protection circuits against static discharge and transient excess voltage. m74hct540 octal bus buffer with 3 state outputs (inverted) pin connection and iec logic symbols order codes package tube t & r dip M74HCT540B1R sop m74hct540m1r m74hct540rm13tr tssop m74hct540ttr tssop dip sop
m74hct541 2/9 input and output equivalent circuit pin description truth table x : dont care z : high impedance absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditi ons is not implied (*) 500mw at 65 c ; derate to 300mw by 10mw/ c from 65 c to 85 c recommended operating conditions pin no symbol name and function 1, 19 g1 , g2 output enable inputs 2, 3, 4, 5, 6, 7, 8, 9 a1 to a8 data inputs 18, 17, 16, 15, 14, 13, 12, 11 y1 to y8 bus outputs 10 gnd ground (0v) 20 v cc positive supply voltage input output g1 g2 an yn hxxz xhxz llhl lllh symbol parameter value unit v cc supply voltage -0.5 to +7 v v i dc input voltage -0.5 to v cc + 0.5 v v o dc output voltage -0.5 to v cc + 0.5 v i ik dc input diode current 20 ma i ok dc output diode current 20 ma i o dc output current 35 ma i cc or i gnd dc v cc or ground current 70 ma p d power dissipation 500(*) mw t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c symbol parameter value unit v cc supply voltage 4.5 to 5.5 v v i input voltage 0 to v cc v v o output voltage 0 to v cc v t op operating temperature -55 to 125 c t r , t f input rise and fall time (v cc = 4.5 to 5.5v) 0 to 500 ns
m74hct541 3/9 dc specifications ac electrical characteristics (c l = 50 pf, input t r = t f = 6ns) symbol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. v ih high level input voltage 4.5 to 5.5 2.0 2.0 2.0 v v il low level input voltage 4.5 to 5.5 0.8 0.8 0.8 v v oh high level output voltage 4.5 i o =-20 m a 4.4 4.5 4.4 4.4 v i o =-6.0 ma 4.18 4.31 4.13 4.10 v ol low level output voltage 4.5 i o =20 m a 0.0 0.1 0.1 0.1 v i o =6.0 ma 0.17 0.26 0.33 0.40 i i input leakage current 5.5 v i = v cc or gnd 0.1 1 1 m a i oz high impedance output leakage current 5.5 v i = v ih or v il v o = v cc or gnd 0.5 5 10 m a i cc quiescent supply current 5.5 v i = v cc or gnd 44080 m a d i cc additional worst case supply current 5.5 per input pin v i = 0.5v or v i = 2.4v other inputs at v cc or gnd 2.0 2.9 3.0 ma symbol parameter test condition value unit v cc (v) c l (pf) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. t tlh t thl output transition time 4.5 50 6 12 15 18 ns t plh t phl propagation delay time 4.5 50 12 20 25 30 ns 4.5 150 16 25 31 38 t pzl t pzh output enable time 4.5 50 r l = 1 k w 18 30 38 45 ns 4.5 150 22 34 43 51 t plz t phz output disable time 4.5 50 r l = 1 k w 19 27 34 41 ns
m74hct541 4/9 capacitive characteristics 1) c pd is defined as the value of the ics internal equivalent capacitance which is calculated from the operating current consumption without load. (refer to test circuit). average operating current can be obtained by the following equation. i cc(opr) = c pd x v cc x f in + i cc /8 (per circuit) test circuit c l = 50pf/150pf or equivalent (includes jig and probe capacitance) r 1 = 1k w or equivalent r t = z out of pulse generator (typically 50 w ) symbol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. c in input capacitance 5.0 5101010pf c pd power dissipation capacitance (note 1) 5.0 34 pf test switch t plh , t phl open t pzl , t plz v cc t pzh , t phz gnd
m74hct541 5/9 waveform 1: propagation delay times (f=1mhz; 50% duty cycle) waveform 2 : output enable and disable times (f=1mhz; 50% duty cycle)
m74hct541 6/9 dim. mm. inch min. typ max. min. typ. max. a1 0.254 0.010 b 1.39 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 d 25.4 1.000 e 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 f 7.1 0.280 i 3.93 0.155 l 3.3 0.130 z 1.34 0.053 plastic dip-20 (0.25) mechanical data p001j
m74hct541 7/9 dim. mm. inch min. typ max. min. typ. max. a 2.65 0.104 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 c 0.5 0.020 c1 45 (typ.) d 12.60 13.00 0.496 0.512 e 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 11.43 0.450 f 7.40 7.60 0.291 0.300 l 0.50 1.27 0.020 0.050 m 0.75 0.029 s8 (max.) so-20 mechanical data po13l
m74hct541 8/9 dim. mm. inch min. typ max. min. typ. max. a 1.2 0.047 a1 0.05 0.15 0.002 0.004 0.006 a2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 d 6.4 6.5 6.6 0.252 0.256 0.260 e 6.2 6.4 6.6 0.244 0.252 0.260 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0 80 8 l 0.45 0.60 0.75 0.018 0.024 0.030 tssop20 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 0087225c
m74hct541 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2001 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom ? http://www.st.com 9/9
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