Preliminary

© 2001 Fairchild Semiconductor Corporation

DS500420

www.fairchildsemi.com

May 2001

Revised May 2001

FST16244

16-Bit Bus Switch (Preliminary)

General Description

The Fairchild Switch FST16244 provides 16-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 16-bit switch. There are four

4-bit switches with separate output enable inputs. When

OE is LOW, the switch in ON and Port A is connected to

Port B. When OE is HIGH, the switch OFF and a high

impedance state exists between the A and B Ports.

Features

s 4

Ω switch connection between two ports.

s Minimal propagation delay through the switch.

s Zero bounce in flow-through mode.

s Control inputs compatible with TTL level.

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Logic Diagram

Pin Descriptions

Truth Table

H

= HIGH Voltage Level L = LOW Voltage Level Z = High Impedance

Order Number

Package Number

Package Description

FST16244MTD

MTD48

48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Pin Name

Description

Output Enable Input (Active LOW)

Bus A

Bus B

Inputs

Outputs

A, B

LA Port

= B Port

HZ