FST16861 20-Bit Bus Switch
March 2000
Revised March 2000
FST16861
20-Bit Bus Switch
General Description
The Fairchild Switch FST16861 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.
Features
s
4鈩?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
FST16861MTD
Package Number
MTD48
Package Description
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Connection Diagram
Logic Diagram
Truth Table
Pin Descriptions
Pin Name
OE
1
, OE
2
1A, 2A
1B, 2B
Description
Bus Switch Enables
Bus A
Bus B
OE
1
L
L
H
H
Inputs
OE
2
L
H
L
H
Inputs/Outputs
1A, 1B
1A
=
1B
1A
=
1B
Z
Z
2A, 2B
2A
=
2B
Z
2A
=
2B
Z
漏 2000 Fairchild Semiconductor Corporation
DS500318
www.fairchildsemi.com
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