Member of Texas Instruments’ Widebus+

Family

5-Ω Switch Connection Between Two Ports

TTL-Compatible Input Levels

Flow-Through Architecture Optimizes PCB

Layout

Ioff Supports Partial-Power-Down Mode

Operation

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

description

The SN74CBT34X245 provides 32 bits of

high-speed TTL-compatible bus switching. The

low on-state resistance of the switch allows

connections to be made with minimal propagation

delay.

The device is organized as four 8-bit bus switches,

two 16-bit bus switches, or one 32-bit bus switch.

When output enable (OE) is low, the switch is on,

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

high, the switch is open, and the high-impedance

state exists between the two ports.

This device is fully specified for partial-powerdown

applications using Ioff. The Ioff circuitry

disables the outputs, preventing damaging

current backflow through the device when it is

powered down.