參數(shù)資料
型號: FST3384A
文件頁數(shù): 64/178頁
文件大?。?/td> 3973K
代理商: FST3384A
Preliminary
1999 Fairchild Semiconductor Corporation
DS500319
www.fairchildsemi.com
September 1999
Revised December 1999
F
FST162861
20-Bit Bus Switch with 25
Series Resistors in Outputs
(Preliminary)
General Description
The Fairchild Switch FST162861 provides 20-Bits of high-
speed CMOS TTL-compatible bus switching. The low on
resistance of the switch allows inputs to be connected to
outputs without adding propagation delay or generating
additional ground bounce noise.
The device is organized as a 10-bit or 20-Bit bus switch.
When OE
1
is LOW, the switch is ON and Port 1A is con-
nected to Port 1B. When OE
2
is LOW, Port 2A is connected
to Port 2B. When OE
X
is HIGH, a high impedance state
exists between the A and B ports. The FST162861 has an
equivalent 25
series resistors to reduce signal-reflection
noise, eliminating the need for external terminating resis-
tors.
Features
I
25
switch connection between two ports.
I
Minimal propagation delay through the switch.
I
Low l
CC
.
I
Zero bounce in flow-through mode.
I
Control inputs compatible with TTL level.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Pin Descriptions
Logic Diagram
Truth Table
Order Number
FST162861MTD
Package Number
MTD48
Package Description
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Name
Description
OE
1
, OE
2
1A, 2A
1B, 2B
Bus Switch Enables
Bus A
Bus B
Inputs
Inputs/Outputs
OE
1
L
L
H
H
OE
2
L
H
L
H
1A, 1B
2A, 2B
1A
=
1B
1A
=
1B
Z
Z
2A
=
2B
Z
2A
=
2B
Z
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