Fairchild FST34X2245 service manual

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FST34X2245

FST34X2245 32-Bit Bus Switch with 25

December 2001
Revised December 2001

32-Bit Bus Switch with 25

General Description

The Fairchild Swit ch FS T34X22 45 pr ovide s 32-b its o f high
speed CMOS TTL-comp atible bus switch ing in a standa rd
flow-through mode. The low On Resistance of the switch
allows inputs to be c onnected to outputs without adding
propagation delay or generatin g additiona l ground boun ce
noise.

The device is organized as a 32-bit swi tch. When OE
LOW, the switch is ON and Port A is connecte d to P ort B.
When OE
ance state exists between the two ports.

The FST34X2245 has equivalent 25
reduce signal-reflection noise, eliminating the need for
external terminating resistors.

is HIGH, the switch is OPEN and a high-imped-

Ω series resistors to

Ω Series Resistors in Outputs

Features

■ 25Ω switch connection between two ports

■ Minimal propagation delay through the switch

■ Low l

CC

■ Zero bounce in flow-through mode

■ Control inputs compatible with TTL level

is

■ 32-bit version of FST32245

■ Packaged in 20.5mm 80-lead package

Ordering Code:

Order Number Package Number Package Description

FST34X2245QSP MQA80A 80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide

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

Logic Diagram

Ω

Series Resistors in Outputs

© 2001 Fairchild Semiconductor Corporation DS500594 www.fairchildsemi.com

Connection Diagram Pin Descriptions

Pin Name Description

OE

n

A

FST34X2245

n

B

n

NC No Connect

Function Table

Bus Switch Enable

Bus A
Bus B

Input OE

n

L Connect
H Disconnect

Function

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