SN74ALVCH162268

12-BIT TO 24-BIT REGISTERED BUS EXCHANGER

WITH 3-STATE OUTPUTS

SCES018G – AUGUST 1995 – REVISED JUNE 1999

2

POST OFFICE BOX 655303

description (continued)

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN74ALVCH162268 is characterized for operation from –40

°C to 85°C.

Function Tables

OUTPUT ENABLE

INPUTS

OUTPUTS

CLK

OEA

OEB

A

1B, 2B

↑

H

H

Z

Z

↑

HL

Z

Active

↑

L

H

Active

Z

↑

L

L

Active

Active

A-TO-B STORAGE

(OEB = L)

INPUTS

OUTPUTS

CLKENA1

CLKENA2

CLK

A

1B

2B

H

H

X

X

1B0‡

2B0‡

L

L

↑

LL†

X

L

L

↑

HH†

X

X

L

↑

LX

L

X

L

↑

H

X

H

† Two CLK edges are needed to propagate data.

‡ Output level before the indicated steady-state input

conditions were established

B-TO-A STORAGE

(OEA = L)

INPUTS

OUTPUT

CLKEN1B

CLKEN2B

CLK

SEL

1B

2B

A

H

X

X

H

X

X

A0‡

X

HX

L

X

X

A0‡

L

L

↑

HL

X

L

L

L

↑

HH

X

H

X

L

↑

LXL

L

X

L

↑

L

X

H

H

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

established