74LVC646A 데이터 시트보기 (PDF) - Philips Electronics

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74LVC646A

Octal bus transceiver/register (3-State)

Philips Electronics 

Philips Semiconductors

Octal bus transceiver/register (3-State)

Product specification

74LVC646A

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

VI

A n, B n

INPUT

GND

t PLH

V OH

Bn,A n

OUTPUT

V OL

VM

VM

t PHL

VI

S AB , S BA

INPUT

GND

V OH

t PHL

Bn,A n

OUTPUT

V OL

VM

VM

t PLH

SV00759

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

times.

SV00761

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

VI

An, B n

INPUT

GND

VOH

CPAB, CP BA

OUTPUT

VOL

VOH

Bn, A n

OUTPUT

VOL

VM

th

tsu

VM

tW

1/fmax

tPHL

th

tsu

tPLH

VI

OE INPUT

GND

VCC

OUTPUT

LOW–to–OFF

OFF–to–LOW

VOL

VOH

OUTPUT

HIGH–to–OFF

OFF–to–HIGH

GND

VM

tPLZ

VX

tPHZ

VY

outputs

enabled

tPZL

VM

tPZH

outputs

disabled

VM

outputs

enabled

SV00758

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

times.

SV00760

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.

1998 Jul 29

9

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