Revised June 2005
20-Bit Bus Switch with 25: Series Resistors in Outputs
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 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 OEX 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-
s 25: 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.
MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pb-Free 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
Note 1: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Note 2: “_NL” indicates Pb-Free product (per JEDEC J-STD-020B). Device is available in Tape and Reel only.
© 2005 Fairchild Semiconductor Corporation DS500319