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FSTU16861

20-Bit Bus Switch with −2V Undershoot Protection

Fairchild Semiconductor 

May 2001

Revised May 2001

FSTU16861

20-Bit Bus Switch with −2V Undershoot Protection

General Description

The Fairchild Switch FSTU16861 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 A and B Ports are

protected against undershoot to support an extended

range to 2.0V below ground. Fairchild’s integrated Under-

shoot Hardened Circuit (UHC) senses undershoot at the

I/O and responds by preventing voltage differentials from

developing and turning the switch on. When OE is HIGH,

the switch is OPEN and a high-impedance state exists

between the two ports.

Features

s Undershoot hardened to −2V (A and B Ports)

s 4Ω 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

s See Application Note AN-5008 for details

Ordering Code:

Order Number Package Number

Package Description

FSTU16861MTD

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.

UHC is a trademark of Fairchild Semiconductor Corporation.

© 2001 Fairchild Semiconductor Corporation DS500422

www.fairchildsemi.com

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