Fairchild Semiconductor FST33X257 Datasheet
FST33X257
24:12 Multiplexer/Demultiplexer Bus Switch
FST33X257 24:12 Multiplexer/Demultiplexer Bus Switch
May 2002
Revised July 2002
General Description
The Fairchild Switch FST33X257 is a 24:12 high-speed
CMOS TTL-compatible multiplexer/demultiplexer bus
switch. The low On Resistance of t he switch allows inputs
to be connected to outputs without adding propagation
delay or generating additional ground bounce noise.
When OE
the selected B Port output . When OE
is OPEN and a high-impedan ce state exists between the
two ports.
is LOW, the select pin connects the A Port to
x
is HIGH, the switch
x
Features
■ 4Ω 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
Ordering Code:
Order Number
FST33X257QSP MQA48A 48-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the or dering code.
Package
Number
Package Descript ion
© 2002 Fairchild Semiconductor Corporation DS500724 www.fairchildsemi.com
Logic Diagram Connection Diagram
FST33X257
www.fairchildsemi.com 2
Pin Descriptions
Pin Name Description
OE
x
S
x
ABus A
B
1–B2
Truth Table
S
X H Disconnect
LL A
HL A = B
OE
x
Bus Switch Enable
x
Select Input
Bus B
Function
= B
1
2
Loading...