Philips Semiconductors

Product specification

74ALVT16501

2.5V/3.3V 18-bit universal bus transceiver (3-State)

1998 Feb 13

4

FUNCTION TABLE

INPUTS

Internal

OUTPUTS

OPERATING MODE

OEAB

LEAB

CPAB

An

Registers

Bn

L

H

X

X

X

Z

Disabled

L

↓

X

h

H

Z

Disabled Latch data

L

↓

X

I

L

Z

Disabled, Latch data

L

L

H or L

X

NC

Z

Disabled, Hold data

L

L

↑

h

H

Z

Disabled Clock data

L

L

↑

I

L

Z

Disabled, Clock data

H

H

X

H

H

H

Transparent

H

H

X

L

L

L

Transparent

H

↓

X

h

H

H

Latch data & display

H

↓

X

I

L

L

Latch data & display

H

L

↑

h

H

H

Clock data & display

H

L

↑

I

L

L

Clock data & display

H

L

H or L

X

H

H

Hold data & display

H

L

H or L

X

L

L

Hold data & display

NOTE: A-to-B data flow is shown; B-to-A flow is similar but uses OEBA, LEBA, and CPBA.

H = High voltage level

h

= High voltage level one set-up time prior to the Enable or Clock transition

L

= Low voltage level

I

= Low voltage level one set-up time prior to the Enable or Clock transition

NC= No Change

X = Don’t care

Z = High Impedence ”off” state

↓ = High-to-Low Enable or Clock transition