© 2005 Fairchild Semiconductor Corporation

DS500043

www.fairchildsemi.com

August 1997

Revised January 2005

FST3125

4-Bit Bus Switch

General Description

The Fairchild Switch FST3125 provides four high-speed

CMOS TTL-compatible bus switches. The low on resis-

tance of the switch allows inputs to be connected to out-

puts without adding propagation delay or generating

additional ground bounce noise.

The device is organized as four 1-bit switches with sepa-

rate 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.

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.

Pb-Free package per JEDEC J-STD-020B.

Order Number

Package

Package Description

Number

FST3125M

M14A

14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

FST3125MX_NL

M14A

Pb-Free 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

FST3125QSC

MQA16

16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide

FST3125MTC

MTC14

14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

FST3125MTCX_NL

MTC14

Pb-Free 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide