SN54ABTH32318, SN74ABTH32318

18-BIT TRI-PORT UNIVERSAL BUS EXCHANGERS

SCBS180E – JUNE 1992 – REVISED MAY 1997

3

POST OFFICE BOX 655303

description (continued)

The SN54ABTH32318 is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74ABTH32318 is characterized for operation from –40

°C to 85°C.

Function Tables

STORAGE†

INPUTS

OUTPUT

CLKA

LEA

A

OUTPUT

↑

L

L

L

↑

LH

H

H

LX

Q0‡

L

LX

Q0‡

X

HL

L

X

H

H

H

† A-port register shown. B and C ports are

similar but use CLKB, CLKC, LEB, and

LEC.

‡ Output level before the indicated

steady-state

input

conditions

were

established

A-PORT OUTPUT

INPUTS

OUTPUT A

OEA

SELA

OUTPUT A

H

X

Z

L

H

Output of C register

L

L

Output of B register

B-PORT OUTPUT

INPUTS

OUTPUT B

OEB

SELB

OUTPUT B

H

X

Z

L

H

Output of A register

L

L

Output of C register

C-PORT OUTPUT

INPUTS

OUTPUT C

OEC

SELC

OUTPUT C

H

X

Z

L

H

Output of B register

L

L

Output of A register