FEATURES

• 16-bit universal bus interface

• 5 V I/O Compatible

• 3-State buffers

• Output capability: +64 mA/–32 mA

• TTL input and output switching levels

• Input and output interface capability to systems at 5 V supply

• Bus-hold data inputs eliminate the need for external pull-up

resistors to hold unused inputs

• Live insertion/extraction permitted

• Power-up 3-State

• Power-up reset

• No bus current loading when output is tied to 5 V bus

• Latch-up protection exceeds 500mA per JEDEC Std 17

• ESD protection exceeds 2000 V per MIL STD 883 Method 3015

and 200 V per Machine Model

DESCRIPTION

The 74ALVT16543 is a high-performance BiCMOS product

designed for VCC operation at 2.5 V or 3.3 V with I/O compatibility

up to 5 V. The device can be used as two 8-bit transceivers or one

16-bit transceiver.

The 74ALVT16543 contains two sets of eight D-type latches, with

separate control pins for each set. Using data flow from A to B as an

example, when the A-to-B Enable (nEAB) input and the A-to-B Latch

Enable (nLEAB) input are LOW, the A-to-B path is transparent.

A subsequent LOW-to-HIGH transition of the nLEAB signal puts the

A data into the latches where it is stored and the B outputs no longer

change with the A inputs. With nEAB and nOEAB both LOW, the

3-State B output buffers are active and display the data present at

the outputs of the A latches.

Control of data flow from B to A is similar, but using the nEBA,

nLEBA, and nOEBA inputs.

Active bus-hold circuitry is provided to hold unused or floating data

inputs at a valid logic level.