FST16861 Datasheet, PDF (1/4 Pages) Fairchild Semiconductor – 20-Bit Bus Switch

March 2000
Revised June 2005
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 OE₁ is LOW, the switch is ON and Port 1A is con-
nected to Port 1B. When OE₂ 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: 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 Package Number
Package Description
FST16861MTD
MTD48
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 “X” to the ordering code.
Logic Diagram
Connection Diagram
Truth Table
Inputs
OE₁
OE₂
L
L
L
H
H
L
H
H
Inputs/Outputs
1A, 1B
2A, 2B
1A 1B
1A 1B
Z
Z
2A 2B
Z
2A 2B
Z
Pin Descriptions
Pin Name
OE₁, OE₂
1A, 2A
1B, 2B
Description
Bus Switch Enables
Bus A
Bus B
© 2005 Fairchild Semiconductor Corporation DS500318
www.fairchildsemi.com