FST32245 查看數據表（PDF） - Fairchild Semiconductor
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FST32245 Datasheet PDF : 5 Pages
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Preliminary
June 2001
Revised June 2001
FST32245
Octal Bus Switch with 25Ω 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
’245 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 25Ω series resistors to
reduce signal-reflection noise, eliminating the need for
external terminating resistors.
Features
s 25Ω switch connection between two ports
s Minimal propagation delay through the switch
s Low lCC
s Zero bounce in flow-through mode
s Control inputs compatible with TTL level
Ordering Code:
Order Number Package Number
Package Description
FST32245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
FST32245QSC
MQA20
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
FST32245MTC
MTC20
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 “X” 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
© 2001 Fairchild Semiconductor Corporation DS500473
www.fairchildsemi.com
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