1/9 april 2001 n high speed: t pd = 4.2ns (typ.) at v cc = 5v n low power dissipation: i cc = 4 m a(max.) at t a =25c n high noise immunity: v nih = v nil = 28 % v cc (min.) n 50 w transmission line driving capability n symmetrical output impedance: |i oh | = i ol = 24ma (min) n balanced propagation delays: t plh @ t phl n operating voltage range: v cc (opr) = 2v to 6v n pin and function compatible with 74 series 240 n improved latch-up immunity description the 74ac240 is an advanced high-speed cmos octal bus buffer (3-state) fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos tecnology. g control input governs four bus buffers. this device is designed to be used with 3 state memory address drivers, etc. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74ac240 octal bus buffer with 3 state outputs (inverted) pin connection and iec logic symbols order codes package tube t & r dip 74ac240b sop 74ac240m 74ac240mtr tssop 74AC240TTR tssop dip sop obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 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 occour. functional operation under these condit ions is not implied. recommended operating conditions 1) v in from 30% to 70% of v cc pin no symbol name and function 11g output enable input 2, 4, 6, 8 1a1 to 1a4 data inputs 9, 7, 5, 3 2y1 to 2y4 data outputs 11, 13, 15, 17 2a1 to 2a4 data inputs 18, 16, 14, 12 1y1 to 1y4 data outputs 19 2g output enable input 10 gnd ground (0v) 20 v cc positive supply voltage inputs output g an yn llh lhl hxz 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 50 ma i cc or i gnd dc v cc or ground current 400 ma t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c symbol parameter value unit v cc supply voltage 2 to 6 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 dt/dv input rise and fall time v cc = 3.0, 4.5 or 5.5v (note 1) 8 ns/v obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 3/9 dc specifications 1) maximum test duration 2ms, one output loaded at time 2) incident wave switching is guaranteed on transmission lines with impedances as low as 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. v ih high level input voltage 3.0 v o = 0.1 v or v cc -0.1v 2.1 1.5 2.1 2.1 v 4.5 3.15 2.25 3.15 3.15 5.5 3.85 2.75 3.85 3.85 v il low level input voltage 3.0 v o = 0.1 v or v cc -0.1v 1.5 0.9 0.9 0.9 v 4.5 2.25 1.35 1.35 1.35 5.5 2.75 1.65 1.65 1.65 v oh high level output voltage 3.0 i o =-50 m a 2.9 2.99 2.9 2.9 v 4.5 i o =-50 m a 4.4 4.49 4.4 4.4 5.5 i o =-50 m a 5.4 5.49 5.4 5.4 3.0 i o =-12 ma 2.56 2.46 2.4 4.5 i o =-24 ma 3.86 3.76 3.7 5.5 i o =-24 ma 4.86 4.76 4.7 v ol low level output voltage 3.0 i o =50 m a 0.002 0.1 0.1 0.1 v 4.5 i o =50 m a 0.001 0.1 0.1 0.1 5.5 i o =50 m a 0.001 0.1 0.1 0.1 3.0 i o =12 ma 0.36 0.44 0.5 4.5 i o =24 ma 0.36 0.44 0.5 5.5 i o =24 ma 0.36 0.44 0.5 i i input leakage current 5.5 v i = v cc or gnd 0.1 1 1 m a ioz high impedance output leakage current 5.5 v i = v ih or v il v o = v cc or gnd 0.5 2.5 5 m a i cc quiescent supply current 5.5 v i = v cc or gnd 44080 m a i old dynamic output current (note 1, 2) 5.5 v old = 1.65 v max 75 50 ma i ohd v ohd = 3.85 v min -75 -50 ma obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 4/9 ac electrical characteristics (c l = 50 pf, r l = 500 w , input t r = t f = 3ns) (*) voltage range is 3.3v 0.3v (**) voltage range is 5.0v 0.5v 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 or equivalent (includes jig and probe capacitance) r l = r 1 = 500 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. t plh t phl propagation delay time 3.3 (*) 1.5 5.7 8.0 1.5 9.0 1.5 11.0 ns 5.0 (**) 1.5 4.2 6.5 1.5 7.0 1.5 8.5 t pzl t pzh output enable time 3.3 (*) 1.5 7.0 10.5 1.5 11.0 1.5 13.0 ns 5.0 (**) 1.5 5.0 8.0 1.5 8.5 1.5 10.5 t plz t phz output disable time 3.3 (*) 1.5 7.0 10.5 1.5 11.5 1.5 13.5 ns 5.0 (**) 1.5 6.5 9.0 1.5 9.5 1.5 11.0 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 5 pf c out output capacitance 5.0 9 pf c pd power dissipation capacitance (note 1) 5.0 f in = 10mhz 21 pf test switch t plh , t phl open t pzl , t plz 2v cc t pzh , t phz open obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 5/9 waveform 1: propagation delays (f=1mhz; 50% duty cycle) waveform 2: output enable and disable time (f=1mhz; 50% duty cycle) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 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 b0.45 0.018 b1 0.25 0.010 d 25.4 1.000 e8.5 0.335 e2.54 0.100 e3 22.86 0.900 f7.10.280 i3.930.155 l3.3 0.130 z1.340.053 p001j plastic dip-20 (0.25) mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 7/9 dim. mm inch min. typ. max. min. typ. max. a2.650.104 a1 0.10 0.20 0.004 0.007 a2 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 c0.50 0.020 c1 45 (typ.) d 12.60 13.00 0.496 0.512 e 10.00 10.65 0.393 0.419 e1.27 0.050 e3 11.43 0.450 f 7.40 7.60 0.291 0.299 l 0.50 1.27 0.19 0.050 m0.750.029 s8 (max.) p013l so-20 mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 8/9 dim. mm inch min. typ. max. min. typ. max. a1.10.433 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 0.85 0.9 0.95 0.335 0.354 0.374 b 0.19 0.30 0.0075 0.0118 c 0.09 0.2 0.0035 0.0079 d 6.4 6.5 6.6 0.252 0.256 0.260 e 6.25 6.4 6.5 0.246 0.252 0.256 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0 o 4 o 8 o 0 o 4 o 8 o l 0.50 0.60 0.70 0.020 0.024 0.028 c e b a2 a e1 d 1 pin 1 identification a1 l k e tssop20 mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac240 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 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
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