1/8 april 2001 n high speed: t pd = 4ns (typ.) at v cc = 5v n low power dissipation: i cc = 2 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 20 n improved latch-up immunity description the 74ac20 is an advanced high-speed cmos dual 4-input nand gate fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos tecnology. the internal circuit is composed of 3 stages including buffer output, which enables high noise immunity and stable output. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74ac20 dual 4-input nand gate pin connection and iec logic symbols order codes package tube t & r dip 74ac20b sop 74ac20m 74AC20MTR tssop 74ac20ttr tssop dip sop obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac20 2/8 input and output equivalent circuit pin description truth table x : dont care 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. recommended operating conditions 1) v in from 30% to 70% of v cc pin no symbol name and function 1, 9 1a to 2a data inputs 2, 10 1b to 2b data inputs 3, 11 n.c. not connected 4, 12 1c to 2c data inputs 5, 13 1d to 2d data inputs 6, 8 1y to 2y data outputs 7 gnd ground (0v) 14 v cc positive supply voltage abcdy lxxxh xlxxh xxlxh xxxlh hhhhl 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 100 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)
74ac20 3/8 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 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 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 i cc quiescent supply current 5.5 v i = v cc or gnd 22040 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 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 5.0 8.5 1.0 10.0 1.0 11.0 ns 5.0 (**) 1.5 4.0 7.0 1.0 9.0 1.0 10.5 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac20 4/8 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 /2 (per gate) 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 ) waveform: propagation delays (f=1mhz; 50% duty cycle) 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 4 pf c pd power dissipation capacitance (note 1) 5.0 f in = 10mhz 33 pf obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac20 5/8 dim. mm inch min. typ. max. min. typ. max. a1 0.51 0.020 b 1.39 1.65 0.055 0.065 b0.5 0.020 b1 0.25 0.010 d200.787 e8.5 0.335 e2.54 0.100 e3 15.24 0.600 f7.10.280 i5.10.201 l3.3 0.130 z 1.27 2.54 0.050 0.100 p001a plastic dip-14 mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac20 6/8 dim. mm inch min. typ. max. min. typ. max. a1.750.068 a1 0.1 0.2 0.003 0.007 a2 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 c0.5 0.019 c1 45 (typ.) d 8.55 8.75 0.336 0.344 e 5.8 6.2 0.228 0.244 e1.27 0.050 e3 7.62 0.300 f 3.8 4.0 0.149 0.157 g 4.6 5.3 0.181 0.208 l 0.5 1.27 0.019 0.050 m0.680.026 s8 (max.) p013g so-14 mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac20 7/8 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 0.20 0.0035 0.0079 d 4.9 5 5.1 0.193 0.197 0.201 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 tssop14 mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
74ac20 8/8 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 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
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