© 2002 Fairchild Semiconductor Corporation

DS500729

www.fairchildsemi.com

May 2002

Revised May 2002

74LVXZ161284

Low Voltage IEEE 161284 Translating Transceiver

with Power-Up Protection

General Description

The LVXZ161284 contains eight bidirectional data buffers

and eleven control/status buffers to implement a full

IEEE 1284 compliant interface. The device supports the

IEEE 1284 standard and is intended to be used in an

Extended Capabilities Port mode (ECP). The pinout allows

for easy connection from the Peripheral (A-side) to the

Host (cable side).

Outputs on the cable side can be configured to be either

open drain or high drive (

± 14 mA) and are connected to a

outputs to be driven by a higher supply voltage than

the A-side. The pull-up and pull-down series termination

resistance of these outputs on the cable side is optimized

to drive an external cable. In addition, the C inputs and the

B and Y outputs on the cable side contain internal pull-up

proper input termination and pull-ups for open drain output

mode.

Outputs on the Peripheral side are standard low-drive

CMOS outputs designed to interface with 3V logic. The DIR

pins.

This device also has an added power-up protection feature

Features

I Supports IEEE 1284 Level 1 and Level 2 signaling

standards for bidirectional parallel communications

between personal computers and printing peripherals

I Translation capability allows outputs on the cable side to

interface with 5V signals

I All inputs have hysteresis to provide noise margin

I B and Y output resistance optimized to drive external

cable

I B and Y outputs in high impedance mode during power

down

I C inputs and B, Y outputs on cable side have internal 1.4

k

Ω pull-up resistors

I Flow-through pin configuration allows easy interface

between the “Peripheral and Host”

I Replaces the function of two (2) 74ACT1284 devices

I Power-up protection prevents errors when the printer is

powered on but no valid signal is at the input pins

Ordering Code

Order Number

Package

Number

Package Description

74LVXZ161284MEA

MS48A

48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" Wide

[RAIL]

74LVXZ161284MEX

MS48A

48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" Wide

[TAPE and REEL]

74LVXZ161284MTD

MTD48

48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

[RAIL]

74LVXZ161284MTX

MTD48

48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

[TAPE and REEL]