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1/11 july 2001 n high speed: t pd = 16ns (typ.) at v cc =6v n low power dissipation: i cc =4 m a(max.) at t a =25 c n high noise immunity: v nih =v nil =28%v cc (min.) n symmetrical output impedance: |i oh |=i ol = 4ma (min) n balanced propagation delays: t plh @ t phl n wide operating voltage range: v cc (opr) = 2v to 6v n pin and function compatible with 74 series 237 description the m74hc237 is an high speed cmos 3 to 8 line decoder fabricated with silicon gate c 2 mos technology. when gl goes from low to high, the address present at the select inputs (a, b, c) is stored in the latches. as long as gl remains high no address changes will be recognized. output enable controls, g1 and g2 control the state of the outputs independently of the select or latch-enable inputs. all of the outputs are low unless g1 is high and g2 is low. the m74hc237 is ideally suited for the implementation of glitch-free decoders in stored-address applications in bus oriented systems. all inputs are equipped with protection circuits against static discharge and transient excess voltage. m74hc237 3 to 8 line decoder latch pin connection and iec logic symbols order codes package tube t & r dip m74hc237b1r sop m74hc237m1r M74HC237RM13TR tssop m74hc237ttr tssop dip sop
m74hc237 2/11 input and output equivalent circuit pin description truth table x : don't care pin no symbol name and function 1, 2, 3 a, b, c data inputs 4 gl latch enable input 5 g2 data enable input (active low) 6 g1 data enable input (active high) 15, 14, 13, 12, 11, 10, 9, 7 y0 to y7 decoder outputs 8 gnd ground (0v) 16 v cc positive supply voltage inputs outputs enable select gl g2 g1 c b a y0 y1 y2 y3 y4 y5 y6 y7 xxlxxxllllllll xhxxxxllllllll llhlllhlllllll llhllhlhllllll llhlhlllhlllll llhlhhlllhllll llhhllllllhlll llhhlhlllllhll llhhhlllllllhl llhhhhlllllllh h l h x x x outputs corresponding to stored address h: all others l
m74hc237 3/11 logic diagram this logic diagram has not be used to estimate propagation delays absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied (*) 500mw at 65 c; derate to 300mw by 10mw/ c from 65 cto85 c recommended operating conditions 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 25 ma i cc or i gnd dc v cc or ground current 50 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 2to6 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 = 2.0v 0 to 1000 ns v cc = 4.5v 0 to 500 ns v cc = 6.0v 0 to 400 ns
m74hc237 4/11 dc specifications symbol parameter test condition value unit v cc (v) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. v ih high level input voltage 2.0 1.5 1.5 1.5 v 4.5 3.15 3.15 3.15 6.0 4.2 4.2 4.2 v il low level input voltage 2.0 0.5 0.5 0.5 v 4.5 1.35 1.35 1.35 6.0 1.8 1.8 1.8 v oh high level output voltage 2.0 i o =-20 m a 1.9 2.0 1.9 1.9 v 4.5 i o =-20 m a 4.4 4.5 4.4 4.4 6.0 i o =-20 m a 5.9 6.0 5.9 5.9 4.5 i o =-4.0 ma 4.18 4.31 4.13 4.10 6.0 i o =-5.2 ma 5.68 5.8 5.63 5.60 v ol low level output voltage 2.0 i o =20 m a 0.0 0.1 0.1 0.1 v 4.5 i o =20 m a 0.0 0.1 0.1 0.1 6.0 i o =20 m a 0.0 0.1 0.1 0.1 4.5 i o =4.0 ma 0.17 0.26 0.33 0.40 6.0 i o =5.2 ma 0.18 0.26 0.33 0.40 i i input leakage current 6.0 v i =v cc or gnd 0.1 1 1 m a i cc quiescent supply current 6.0 v i =v cc or gnd 44080 m a
m74hc237 5/11 ac electrical characteristics (c l = 50 pf, input t r =t f = 6ns) capacitive characteristics 1) c pd is defined as the value of the ic's internal equivalent capacitance which is calculated from the operating current consumption without load. symbol parameter test condition value unit v cc (v) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. t tlh t thl output transition time 2.0 30 75 95 110 ns 4.5 8151922 6.0 7131619 t plh t phl propagation delay time (a, b, c - y) 2.0 60 180 225 270 ns 4.5 19 36 45 54 6.0 16 31 38 46 t plh t phl propagation delay time (g1 - y) 2.0 45 140 175 210 ns 4.5 15 28 35 42 6.0 13 24 30 36 t plh t phl propagation delay time (g2 - y) 2.0 45 140 175 210 ns 4.5 15 28 35 42 6.0 13 24 30 36 t plh t phl propagation delay time (gl - y) 2.0 65 190 240 285 ns 4.5 21 38 48 57 6.0 18 32 41 48 t w(l) minimum pulse width (gl) 2.0 10 75 95 110 ns 4.5 6151922 6.0 6131619 t s minimum set-up time (a, b, c - gl) 2.0 12 50 65 75 ns 4.5 3101315 6.0 2 9 11 13 t h minimum hold time (a, b, c - gl) 2.0 25 30 40 ns 4.5 5 6 8 6.0 5 5 7 symbol parameter test condition value unit v cc (v) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. c in input capacitance 5.0 5101010pf c pd power dissipation capacitance (note 1) 5.0 52 pf
m74hc237 6/11 test circuit c l = 50pf or equivalent (includes jig and probe capacitance) r t =z out of pulse generator (typically 50 w ) waveform 1: propagation delay time (f=1mhz; 50% duty cycle)
m74hc237 7/11 waveform 2: setup and hold time, minimum pulse width (gl) (f=1mhz; 50% duty cycle)
m74hc237 8/11 dim. mm. inch min. typ max. min. typ. max. a1 0.51 0.020 b 0.77 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 d 20 0.787 e 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 f 7.1 0.280 i 5.1 0.201 l 3.3 0.130 z 1.27 0.050 plastic dip-16 (0.25) mechanical data p001c
m74hc237 9/11 dim. mm. inch min. typ max. min. typ. max. a 1.75 0.068 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 c 0.5 0.019 c1 45 (typ.) d 9.8 10 0.385 0.393 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 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 m 0.62 0.024 s8 (max.) so-16 mechanical data po13h
m74hc237 10/11 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 4.9 5 5.1 0.193 0.197 0.201 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 8 0 8 l 0.45 0.60 0.75 0.018 0.024 0.030 tssop16 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 0080338d
m74hc237 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 infringe ment of patents or other righ ts of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this pub lication are subject to change without notice. thi s pub lication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authori zed for use as critical components in life suppo rt 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 - swit zerland - united kingdom ? http://w ww.st.com 11/11

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