Fairchild FST16233 service manual

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FST16233
16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch

FST16233 16-Bit to 32-Bit Multiplexer/Demult iplexer Bus Switch

September 1997
Revised December 1999

General Description

The Fairchild Swi tch FST16233 is a 16-bit to 32-bit hig h­speed CMOS TTL-compatible multiplexer/demultiplexer
bus switch. The low on resistance of the switch allows
inputs to be connect ed to out puts wit hout adding prop aga­tion delay or generating additional ground bounce noise.

The device can be used in applications where two buses
need to be addressed simu ltaneously. The FST16233 c an
be used as two 8-bit to 16-b it mul tiplexer s or as one 16-bit
to 32-bit multiplexer.

Two select (SEL
inputs provide switch enable and multiplexer select control.
The FST16233 is designed to prevent through-current

when switching buses.

, SEL0) and two test (TEST0, TEST1)

1

Features

■ 4Ω switch connection between two ports.

■ Minimal propagation delay through the switch.

■ Low l

■ Zero bounce in flow-through mode.

■ Control inputs compatible with TTL level.

.

CC

Ordering Code:

Order Number Package Number Package Description

FST16233MEA MS56A 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
FST16233MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.

Logic Diagram

© 1999 Fairchild Semiconductor Corporation DS500055 www.fairchildsemi.com

Connection Diagram Pin Descriptions

Pin Name Description

SEL

, SEL

FST16233

TEST

0

, TEST

0

ABus A
, B

B

1

Truth Table

Inputs

SEL TEST

LL A = B
HL A = B
XHA = B1 and A = B

1

1

2

Select Inputs

Test Inputs

Bus B

Function

1
2

2

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