74HC646 datasheet(8/12 Pages) PHILIPS

8 / 12 page

September 1993

Philips Semiconductors

Product speciﬁcation

Octal bus transceiver/register; 3-state

74HC/HCT646

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

An,Bn to Bn,An

4.5

Fig.6

tPHL/ tPLH

propagation delay

CPAB,CPBA to Bn,An

4.5

Fig.7

tPHL/ tPLH

propagation delay

SAB,SBA to Bn,An

4.5

Fig.8

tPZH/ tPZL

3-state output enable time

OE to An,Bn

4.5

Fig.9

tPHZ/ tPLZ

3-state output disable time

OE to An,Bn

4.5

Fig.9

tPZH/ tPZL

3-state output enable time

DIR to An,Bn

4.5

Fig.10

tPHZ/ tPLZ

3-state output disable time

DIR to An,Bn

4.5

Fig.10

tTHL/ tTLH

output transition time

4.5

Fig.6 and Fig.8

clock pulse width

HIGH or LOW

CPAB or CPBA

4.5

Fig.7

tsu

set-up time

An,Bn to CPAB,CPBA

4.5

Fig.7

hold time

An,Bn to CPAB,CPBA

4.5

Fig.7

fmax

maximum clock pulse

frequency

MHz

4.5

Fig.7

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