SN54GTL1655, SN74GTL1655

16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVERS

WITH LIVE INSERTION

SCBS696E – JULY 1997 – REVISED NOVEMBER 1999

4

POST OFFICE BOX 655303

Function Tables

FUNCTION†

INPUTS

OUTPUT

MODE

OEAB

LEAB

CLK

A

B

MODE

H

X

X

X

Z

Isolation

L

HX

L

L

Transparent

L

HX

H

H

Transparent

L

L

↑

LL

Registered

L

L

↑

HH

Registered

L

LH

X

B0‡

Previous State

L

L

L

X

B0§

Previous State

† A-to-B data flow is shown. B-to-A flow is similar, but uses OEBA, LEBA,

and CLK.

‡ Output level before the indicated steady-state input conditions were

established, provided that CLK was high before LEAB went low

§ Output level before the indicated steady-state input conditions were

established

OUTPUT ENABLE

INPUTS

OUTPUTS

OE

OEAB

OEBA

A PORT

B PORT

L

L

L

Active

Active

L

LH

Z

Active

L

H

L

Active

Z

L

HH

Z

Z

H

X

X

Z

Z

B-PORT EDGE-RATE CONTROL (VERC)

INPUT VERC

OUTPUT

LOGIC

LEVEL

NOMINAL

VOLTAGE

B PORT

EDGE RATE

H

VCC

Slow

L

GND

Fast