The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FEATURES:

• Bus switches provide zero delay paths

• Extended commercial range of –40

°C to +85°C

• Low switch on-resistance:

FST163xxx – 5

Ω

FST1632xxx — 28

Ω

• TTL-compatible input and output levels

• ESD > 2000V per MIL-STD-883, Method 3015;

> 200V using machine model (C = 200pF, R = 0)

• Available in SSOP, TSSOP and TVSOP

COMMERCIAL TEMPERATURE RANGE

MAY 1996

©1997 Integrated Device Technology, Inc.

DSC-3474/4

1

IDT74FST163383

IDT74FST1632383

ADVANCE INFORMATION

20-BIT BUS EXCHANGE

SWITCH

no noise of their own while providing a low resistance path for

an external driver. These devices connect input and output

ports through an n-channel FET. When the gate-to-source

junction of this FET is adequately forward-biased the device

conducts and the resistance between input and output ports

is small. Without adequate bias on the gate-to-source junction

applied, the device has hot insertion capability.

The low on-resistance and simplicity of the connection

between input and output ports reduces the delay in this path

to close to zero.

The FST1632xxx integrates terminating resistors in the

device, thus eliminating the need for external 25

Ω series

resistors.

The FST163383 and FST1632383 each provide four 4-bit

TTL- compatible ports that support 2 way bus exchange. The

BX pin controls the bus exchange and the BE pin serves as the

enable pin.

PIN DESCRIPTION

Pin Names

I/O

Description

I/O

Buses A, B

I/O

Buses C, D

I

Bus Switch Enable (Active LOW)

I

Bus Exchange

3474 drw 01

3474 tbl 01

DESCRIPTION:

The FST163383/1632383 belong to IDT's family of Bus

switches. Bus switch devices perform the function of connect-

ing or isolating two ports without providing any inherent

current sink or source capability. Thus they generate little or

FUNCTIONAL BLOCK DIAGRAM