March 2008

© 2001 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSTD3125 • Rev. 1.0.2

FSTD3125 — 4-Bit Bus Switch with Level Shifting

Features

4

Ω Switch Connection between Two Ports

Minimal Propagation Delay through the Switch

Zero Bounce in Flow-through Mode

Control Inputs Compatible with TTL Level

TruTranslation Voltage Translation from 5.0V

Inputs to 3.3V Outputs

Description

Fairchild switch FSTD3125 provides four high-speed

CMOS TTL-compatible bus switches. The low on

resistance of the switch allows inputs to be connected

to

outputs

without

adding

propagation

delay

or

generating additional ground bounce noise. A diode to

shifting between 5V inputs and 3.3V outputs.

The device is organized as four one-bit switches with

separate /OE inputs. When /OE is LOW, the switch is

ON and port A is connected to port B. When /OE is

HIGH, the switch is OPEN and a high-impedance state

exists between the two ports.

Ordering Information

Part Number

Operating

Temperature

Range

Package

Packing

Method

FSTD3125MTC

-40 to 85°C

14-Lead, Thin Shrink Small Outline Package (TSSOP) JEDEC

MO-153, 4mm Wide

Tube

FSTD3125MTCX

-40 to 85°C

14-Lead, Thin Shrink Small Outline Package (TSSOP), JEDEC

MO-153, 4mm Wide

Tape and Reel

All packages are lead free per JEDEC: J-STD-020B standard.

Technology Description

The Fairchild switch family derives from and embodies Fairchild’s proven switch technology used for several years in its

74LVX3L384 (FST3384) bus switch product.

1A

4A

3A

2A

1B

2B

3B

4B

1

23

4

56

8

10

9

13

11

12

Figure 1. Logic Diagram