7LVC646APWDH datasheet(9/16 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC646A

Octal bus transceiver/register (3-State)

1998 Jul 29

AC WAVEFORMS

VM = 1.5V at VCC w 2.7V

VM = 0.5V * VCC at VCC t 2.7V

VOL and VOH are the typical output voltage drop that occur with the

output load.

VX = VOL + 0.3V at VCC w 2.7V

VX = VOL + 0.1VCC at VCC < 2.7V

VY = VOH – 0.3V at VCC w 2.7V

VY = VOH – 0.1VCC at VCC < 2.7V

SV00761

V M

A n , B n

INPUT

B n , A n

OUTPUT

t PHL

t PLH

GND

V OL

V I

V OH

Figure 1. Input An, Bn to output Bn, An propagation delays.

SV00760

An, B n

INPUT

CPAB, CPBA

OUTPUT

Bn, A n

OUTPUT

tPHL

tPLH

1/fmax

tsu

GND

VOL

VOH

Figure 2. An, Bn to CPAB, CPBA set-up and hold times, clock

CPAB, CPBA pulse width, maximum clock pulse frequency and

the CPAB, CPBA to output Bn, An propagation delays.

SV00759

S AB , S BA

INPUT

B n , A n

OUTPUT

PLH

PHL

GND

V OL

V OH

Figure 3. Input SAB, SBA to output Bn, An propagation delay

times.

SV00758

outputs

disabled

outputs

enabled

outputs

enabled

tPHZ

tPZH

tPZL

tPLZ

VOL

VCC

GND

VOH

OE INPUT

OUTPUT

HIGH–to–OFF

OFF–to–HIGH

OUTPUT

LOW–to–OFF

OFF–to–LOW

Figure 4. Input OE to output An, Bn 3-State enable and disable

times.

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