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FSTU16211

24-Bit Bus Switch with −2V Undershoot Protection (Preliminary)

Fairchild Semiconductor 

Preliminary

May 2001

Revised May 2001

FSTU16211

24-Bit Bus Switch with −2V Undershoot Protection

(Preliminary)

General Description

The Fairchild Switch FSTU16211 provides 24-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 12-bit or 24-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. The A and B Ports are protected against under-

shoot to support an extended range to 2.0V below ground.

Fairchild’s integrated Undershoot Hardened Circuit

(UHC) senses undershoot at the I/O and responds by

preventing voltage differentials from developing and turn-

ing the switch on.

Features

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

s Slower output enable times to prevent signal disruption

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 Applications Note AN-5008 for details

Ordering Code:

Order Number Package Number

Package Description

FSTU16211MTD

MTD56

56-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 DS500389

www.fairchildsemi.com

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