鈩?/div>
Series Resistor in Outputs
(Preliminary)
General Description
The Fairchild Switch FST32245 provides 8-bits of high-
speed CMOS TTL-compatible bus switching in a standard
鈥?45 pin-out. The low On Resistance of the switch allows
inputs to be connected to outputs without adding propaga-
tion delay or generating additional ground bounce noise.
The device is organized as an 8-bit switch. When OE is
LOW, the switch is ON and Port A is connected to Port B.
When OE is HIGH, the switch is OPEN and a high-imped-
ance state exists between the two ports.
The FST32245 has an equivalent 25
鈩?/div>
series resistors to
reduce signal-reflection noise, eliminating the need for
external terminating resistors.
Features
s
25
鈩?/div>
switch connection between two ports
s
Minimal propagation delay through the switch
s
Low l
CC
s
Zero bounce in flow-through mode
s
Control inputs compatible with TTL level
Ordering Code:
Order Number
FST32245WM
FST32245QSC
FST32245MTC
Package Number
M20B
MQA20
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Logic Diagram
Connection Diagram
Pin Descriptions
Pin Name
OE
A
B
NC
Description
Bus Switch Enable
Bus A
Bus B
No Connect
Truth Table
Input OE
L
H
Function
Connect
Disconnect
漏 2001 Fairchild Semiconductor Corporation
DS500473
www.fairchildsemi.com
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