1/10 april 2001 n high speed: t pd = 6ns (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 280 n improved latch-up immunity description the 74ac280 is an advanced high-speed cmos 9 bit parity generator fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos tecnology. it is composed of nine data inputs (a to i) and odd/ even parity outputs ( s odd and s even). the nine data inputs control the output conditions. when the number of high level input is odd, s odd output is kept high and s even output low. conservely, when the output is even, s even output is kept high and s odd low. the ic generates either odd or even parity making it flexible application. the word-length capability is easly expanded by cascading. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74ac280 9 bit parity generator pin connection and iec logic symbols order codes package tube t & r dip 74AC280B sop 74ac280m 74ac280mtr tssop 74ac280ttr tssop dip sop
74ac280 2/10 input and output equivalent circuit pin description truth table logic diagram pin no symbol name and function 5, 6 s even so dd parity outputs 8, 9, 10, 11, 12, 13, 1, 2, 4 a to i data inputs 3 nc no connection 7 gnd ground (0v) 14 v cc positive supply voltage number of inputs a - i that are high outputs s even s odd 0, 2, 4, 6, 8 h l 1, 3, 5, 7, 9 l h
74ac280 3/10 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 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 200 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
74ac280 4/10 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 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 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 (input - s odd, s even) 3.3 (*) 1.5 8.0 17.0 1.0 18.5 1.0 18.5 ns 5.0 (**) 1.5 6.0 13.0 1.0 14.5 1.0 14.5
74ac280 5/10 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 /n (per circuit) test circuit c l = 50pf or equi valent (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. c in input capacitance 5.0 4 pf c pd power dissipation capacitance (note 1) 5.0 f in = 10mhz 65 pf
74ac280 6/10 waveform: propagation delays (f=1mhz; 50% duty cycle)
74ac280 7/10 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
74ac280 8/10 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
74ac280 9/10 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
74ac280 10/10 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
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