Fairchild FST16861 20-Bit Bus Switch Data Handbook
Summary
A 20-bit high-speed CMOS bus switch providing low-resistance connection between two ports with TTL-compatible control inputs. Features minimal propagation delay, zero bounce in flow-through mode, and low ICC power consumption. Organized as 10-bit or 20-bit bus switch with active-low enable control. Available in 48-lead TSSOP package. Designed for digital system designers and electronics engineers requiring reliable bus switching in board-level applications such as data communication interfaces, memory systems, and peripheral bus isolation.
Page 1 Text Content
16861 20-B it B s S itch
March 2000 Revised June 2005
FST16861 20-Bit Bus Switch General Description Features The Fairchild Switch FST16861 provides 20-bits of high- ■4: switch connection between two ports speed CMOS TTL-compatible bus switching. The low On
■Minimal propagation delay through the switch
Resistance of the switch allows inputs to be connected to
■Low l CC
outputs without adding propagation delay or generating
additional ground bounce noise. ■Zero bounce in flow-through mode The device is organized as a 10-bit or 20-bit bus switch. ■Control inputs compatible with TTL level
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.
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 Inputs/Outputs
Pin Descriptions
OE1 OE2 1A, 1B 2A, 2B
1A 1B 2A 2B Pin Name Description
1A 1B OE1, OE2 Bus Switch Enables
2A 2B 1A, 2A Bus A
1B, 2B Bus B
© 2005 Fairchild Semiconductor Corporation DS500318 www.fairchildsemi.com
Page Summary Contents For Fairchild FST16861 20-Bit Bus Switch Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 4 |
| File Size | 154.26 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What supply voltage range does the FST16861 operate at?
The recommended operating supply voltage is 4.0V to 5.5V.
How do I enable the FST16861 bus switch?
Set OE1 and OE2 to LOW to connect the A and B ports.
Is propagation delay added by the switch?
No, it adds no propagation delay besides RC delay from on resistance and load capacitance.
What package does the FST16861MTD use?
It uses a 48-Lead TSSOP package, JEDEC MO-153, 6.1mm wide.