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1/13 july 2001 n high speed: t pd = 25 ns (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 = 6ma (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 356 description the m74hc356 is an high speed cmos 8 channel multiplexer/register (3-state) fabricated with silicon gate c 2 mos technology. this device contains an 8 channel digital multiplexer with an 8-input data register and a 3-bit address input register with 3-state outputs. the one of eight input data will be provided on the y output pin (non-inverted output) and w output pin (inverted output) determined by the address data. the information at the data inputs ( d0 to d7) is stored in the 8-bit flip-flop at the positive going edge of clock input (clock). the information at the address inputs (s0 to s2) is stored in the 3-bit latch at the negative pulse on sc input. these outputs are disabled to be high-impedance when input g1 is held high, input g2 is held high or input g3 is held low. this device is suitable for interfacing with bus lines in a bus organized system. the m74hc356 is similar in function to the m74hc354, which has an 8-bit latch as the data register instead of an 8-bit flip-flop. all inputs are equipped with protection circuits against static discharge and transient excess voltage. m74hc356 pin connection and iec logic symbols order codes package tube t & r dip m74hc356b1r sop m74hc356m1r M74HC356RM13TR tssop m74hc356ttr tssop dip sop 8 channel multiplexer/register with latches (3 state)
m74hc356 2/13 input and output equivalent circuit pin description truth table x : don't care z : high impedance * : this column shows the input address setup with sc low. d0n....d7n : the level of steady state inputs at input d1 through d7, respectively, before the most recent low to high transition of data control. pin no symbol name and function 8, 7, 6, 5, 4, 3, 2, 1 d0 to d7 data inputs 9 clock clock input (low to high, edge-triggered) 11 sc latch enable input (active low) 14, 13, 12 s0, s1, s2 select inputs 15, 16 g1, g2 output enable inputs (active low) 17 g3 output enable input (active high) 18 w 3 - state multiplexer output (active low) 19 y 3 - state multiplexer output (active high) 10 gnd ground (0v) 20 v cc positive supply voltage inputs outputs select * clock output enables wy s2 s1 s0 g1 g2 g3 xxxxhxxzz xxxxxhxzz xxxxxxlzz lll llh d0 d0 lll llh d0n d0n llh llh d1 d1 llh llh d1n d1n lhl llh d2 d2 lhl llh d2n d2n lhh llh d3 d3 lhh llh d3n d3n hll llh d4 d4 hll llh d4n d4n hlh llh d5 d5 hlh llh d5n d5n hhl l lh d6 d6 hhl l lh d6n d6n hhh l lh d7 d7 hhh l lh d7n d7n
m74hc356 3/13 truth table of internal latch x : don't care qn : data stored at the trailing edge of the most recent st pulse. truth table of internal latch (flip flop) x : don't care qn : no change. logic diagram inputs outputs dstq q lhlh hhhl x l qn qn dckq l l h h x qn
m74hc356 4/13 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 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 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
m74hc356 5/13 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 =-6.0 ma 4.18 4.31 4.13 4.10 6.0 i o =-7.8 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 =6.0 ma 0.17 0.26 0.33 0.40 6.0 i o =7.8 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 oz high impedance output leakage current 6.0 v i =v ih or v il v o =v cc or gnd 0.5 5 5 m a i cc quiescent supply current 6.0 v i =v cc or gnd 44080 m a
m74hc356 6/13 ac electrical characteristics (c l = 50 pf, input t r =t f = 6ns) 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 50 25 60 75 90 ns 4.5 7121518 6.0 6101315 t plh t phl propagation delay time (clock - y, w) 2.0 50 99 240 300 360 ns 4.5 28 48 60 72 6.0 22 41 51 61 2.0 150 117 280 350 420 4.5 33 56 70 84 6.0 26 48 60 71 t plh t phl propagation delay time (sn - y, w) 2.0 50 111 260 325 390 ns 4.5 32 52 65 78 6.0 24 44 55 66 2.0 150 128 300 375 450 4.5 37 60 75 90 6.0 28 51 64 77 t plh t phl propagation delay time (sc - y, w) 2.0 50 115 270 340 405 ns 4.5 33 54 68 81 6.0 25 46 58 69 2.0 150 132 310 390 465 4.5 38 62 78 93 6.0 29 53 66 79 t pzl t pzh high impedance output enable time 2.0 50 r l =1k w 48 125 155 190 ns 4.5 14 25 31 38 6.0 11 21 26 32 2.0 150 r l =1k w 65 165 205 250 4.5 19 33 41 50 6.0 15 28 35 43 t plz t phz high impedance outout disable time 2.0 50 r l =1k w 43 155 195 235 ns 4.5 18 31 39 47 6.0 16 26 33 40 f max maximum clock frequency 2.0 50 6.2 20 5 4.2 mhz 4.5 31 80 25 21 6.0 37 82 30 25 t w(l) t w(h) minimum pulse width (clock) 2.0 50 25 75 95 110 ns 4.5 6151922 6.0 6131619 t w(l) minimum pulse width (sc) 2.0 50 13 75 95 110 ns 4.5 6151922 6.0 6131619 t s minimum set-up time (dn to clock) 2.0 50 21 50 65 75 ns 4.5 4101315 6.0 3 9 11 13 t s minimum set-up time (sn to clock) 2.0 50 9506575 ns 4.5 2101315 6.0 2 9 11 13
m74hc356 7/13 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. (refer to test circuit). average operating current can be obtained by the following equation. i cc(opr) =c pd xv cc xf in +i cc 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 ) t h minimum hold time (dn,sn to clock) 2.0 50 555 ns 4.5 5 5 5 6.0 5 5 5 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 59 pf test switch t plh ,t phl open t pzl ,t plz v cc t pzh ,t phz gnd 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.
m74hc356 8/13 waveform 1 : propagation delay times (f=1mhz; 50% duty cycle) waveform 2 : setup and hold times (f=1mhz; 50% duty cycle)
m74hc356 9/13 waveform 3 : propagation delay times, minimum pulse width (f=1mhz; 50% duty cycle) waveform 4 : output enable and disable time (f=1mhz; 50% duty cycle)
m74hc356 10/13 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
m74hc356 11/13 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
m74hc356 12/13 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 8 0 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
m74hc356 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 13/13

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