74HC670 datasheet(7/9 Pages) PHILIPS

7 / 9 page

December 1990

Philips Semiconductors

Product speciﬁcation

4 x 4 register ﬁle; 3-state

74HC/HCT670

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr =tf = 6 ns; CL =50pF

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT

VCC

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min.

typ.

max. min. max. min.

max.

tPHL/ tPLH

propagation delay

RA, RB to Qn

4.5

Fig.6

tPHL/ tPLH

propagation delay

WE to Qn

4.5

Fig.7

tPHL/ tPLH

propagation delay

Dn to Qn

4.5

Fig.7

tPZH/ tPZL

3-state output enable time

RE to Qn

4.5

Fig.9

tPHZ/ tPLZ

3-state output disable time

RE to Qn

4.5

Fig.9

tTHL/ tTLH

output transition time

4.5

Fig.6

write enable pulse width

LOW

4.5

Fig.8

tsu

set-up time

Dn to WE

4.5

Fig.8

tsu

set-up time

WA, WB to WE

−2

4.5

Fig.8

hold time

Dn to WE

−1

4.5

Fig.8

hold time

WA, WB to WE

4.5

Fig.8

tlatch

latch time

WE to RA, RB

4.5

Fig.8

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