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1/11 june 2001 n high speed: f max = 160 mhz (typ.) at v cc = 5v n low power dissipation: i cc = 2 m a (max.) at t a =25c n compatible with ttl outputs: v ih = 2v (min.), v il = 0.8v (max) n power down protection on inputs & outputs n symmetrical output impedance: |i oh | = i ol = 8 ma (min) n balanced propagation delays: t plh @ t phl n operating voltage range: v cc (opr) = 4.5v to 5.5v n pin and function compatible with 74 series 74 n improved latch-up immunity description the 74vhct74a is an advanced high-speed cmos dual d-type flip flop with preset and clear fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos technology. a signal on the d input is transferred to the q output during the positive going transition of the clock pulse. clr and pr are independent of the clock and accomplished by a low setting on the appropriate input. power down protection is provided on all inputs and outputs and 0 to 7v can be accepted on inputs with no regard to the supply voltage. this device can be used to interface 5v to 3v since all inputs are equipped with ttl threshold. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74vhct74a dual d-type flip flop with preset and clear pin connection and iec logic symbols order codes package tube t & r sop 74VHCT74AM 74VHCT74AMtr tssop 74vhct74attr tssop sop
74vhct74a 2/11 input equivalent circuit pin description truth table x : dont care logic diagram this logic diagram has not be used to estimate propagation delays pin no symbol name and function 1, 13 1clr , 2clr asyncronous reset - direct input 2, 12 1d, 2d data inputs 3, 11 1ck, 2ck clock input (low to high, edge triggered) 4, 10 1pr , 2pr asyncronous set - direct input 5, 9 1q, 2q true flip-flop outputs 6, 8 1q , 2q complement flip-flop outputs 7 gnd ground (0v) 14 v cc positive supply voltage inputs outputs function clr pr dckq q l h x x l h clear h l x x h l preset llxxhh hhl lh hhh hl hhx q n q n no change
74vhct74a 3/11 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 1) v cc = 0v 2) high or low state recommended operating conditions 1) v cc = 0v 2) high or low state 3) vin from 0.8v to 2v symbol parameter value unit v cc supply voltage -0.5 to +7.0 v v i dc input voltage -0.5 to +7.0 v v o dc output voltage (see note 1) -0.5 to +7.0 v v o dc output voltage (see note 2) -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 t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c symbol parameter value unit v cc supply voltage 4.5 to 5.5 v v i input voltage 0 to 5.5 v v o output voltage (see note 1) 0 to 5.5 v v o output voltage (see note 2) 0 to v cc v t op operating temperature -55 to 125 c dt/dv input rise and fall time (see note 3) (v cc = 5.0 0.5v) 0 to 20 ns/v
74vhct74a 4/11 dc specifications ac electrical characteristics (input t r = t f = 3ns) (*) 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 4.5 to 5.5 222v v il low level input voltage 4.5 to 5.5 0.8 0.8 0.8 v v oh high level output voltage 4.5 i o =-50 m a 4.4 4.5 4.4 4.4 v 4.5 i o =-8 ma 3.94 3.8 3.7 v ol low level output voltage 4.5 i o =50 m a 0.0 0.1 0.1 0.1 v 4.5 i o =8 ma 0.36 0.44 0.55 i i input leakage current 0 to 5.5 v i = 5.5v or gnd 0.1 1.0 1.0 m a i cc quiescent supply current 5.5 v i = v cc or gnd 22020 m a i cc additional worst case supply current 5.5 one input at 3.4v, other input at v cc or gnd 1.35 1.5 1.5 ma i opd output leakage current 0 v out = 5.5v 0.5 5.0 5.0 m a symbol parameter test condition value unit v cc (v) c l (pf) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. t plh t phl propagation delay time ck to q or q 5.0 (*) 15 5.8 7.8 1.0 9.0 1.0 9.0 ns 5.0 (*) 50 6.3 8.8 1.0 10.0 1.0 10.0 t plh t phl propagation delay time pr or clr to q or q 5.0 (*) 15 7.6 10.4 1.0 12.0 1.0 12.0 ns 5.0 (*) 50 8.1 11.4 1.0 13.0 1.0 13.0 t w ck pulse width high or low 5.0 (*) 5.0 5.0 5.0 ns t w pr or clr pulse width low 5.0 (*) 5.0 5.0 5.0 ns t s setup time d to ck high or low 5.0 (*) 5.0 5.0 5.0 ns t h hold time d to ck high or low 5.0 (*) 0.0 0.0 0.0 ns t rem removal time pr or clr to ck 5.0 (*) 3.5 3.5 3.5 ns f max maximum clock frequency 5.0 (*) 15 100 160 80 80 mhz 5.0 (*) 50 80 140 65 65
74vhct74a 5/11 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 =15/50pf or equivalent (includes jig and probe capacitance) r t = z out of pulse generator (typically 50 w ) symbol parameter test condition value unit t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. c in input capacitance 6101010pf c pd power dissipation capacitance (note 1) 21 pf
74vhct74a 6/11 waveform 1: propagation delays, setup and hold times (f=1mhz; 50% duty cycle)
74vhct74a 7/11 waveform 2: propagation delays (f=1mhz; 50% duty cycle) waveform 3: removal times (f=1mhz; 50% duty cycle)
74vhct74a 8/11 waveform 4: pulse width
74vhct74a 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 8.55 8.75 0.336 0.344 e 5.8 6.2 0.228 0.244 e 1.27 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 m 0.68 0.026 s8 (max.) so-14 mechanical data po13g
74vhct74a 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 80 8 l 0.45 0.60 0.75 0.018 0.024 0.030 tssop14 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 0080337d
74vhct74a 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 11/11

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