74LVC646AD datasheet(8/16 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC646A

Octal bus transceiver/register (3-State)

1998 Jul 29

AC CHARACTERISTICS

GND = 0 V; tr = tf v 2.5 ns; CL = 50 pF

LIMITS

SYMBOL

PARAMETER

WAVEFORM

VCC = 3.3V ±0.3V

VCC = 2.7V

VCC =

1.2V

UNIT

MIN

TYP1

MAX

MIN

MAX

TYP

tPHL/tPLH

Propagation delay

An, Bn to Bn, An

Figures 1, 6

1.5

3.9

6.8

1.5

7.8

tPHL/tPLH

Propagation delay

CPAB, CPBA to Bn, An

Figures 2, 6

1.5

4.6

7.6

1.5

8.6

tPHL/tPLH

Propagation delay

SAB, SBA to Bn, An

Figures 3, 6

1.5

4.9

8.5

1.5

9.5

tPZH/tPZL

3-State output enable time

OEn to An, Bn

Figures 4, 6

1.5

4.5

7.8

1.5

8.8

tPHZ/tPLZ

3-State output disable time

OEn to An, Bn

Figures 4, 6

1.5

3.9

6.1

1.5

7.1

tPZH/tPZL

3-State output enable time

DIR to An, Bn

Figures 5, 6

1.5

4.6

7.9

1.5

8.9

tPHZ/tPLZ

3-State output disable time

DIR to An, Bn

Figures 5, 6

1.5

3.5

6.0

1.5

7.0

Clock pulse width

HIGH or LOW

CPAB or CPBA

Figure 1, 3

3.3

1.9

–

3.3

–

tsu

Set-up time

An, Bn to CPAB, CPBA

Figure 2

1.6

0.35

–

1.6

–

Hold time

An, Bn to CPAB, CPBA

Figure 2

1.0

–0.3

–

1.0

–

fmax

Maximum clock pulse frequency

Figure 2

150

250

–

125

–

NOTE:

1. These typical values are at VCC = 3.3V and Tamb = 25°C.

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