MAXIM MAX9420–MAX9423 Quad Differential LVECL-to-LVPECL Translators

19-2285; Rev 0; 1/02

Quad Differential LVECL-to-LVPECL Translators

General Description Features

The MAX9420–MAX9423 are extremely fast, low-skew >500m V Differential Output at 3.0GHz Clock quad LVECL-to-LVPECL translators designed for high-

336ps (typ) Propagation Delay in Asynchronous

speed signal and clock driver applications. The

devices feature ultra-low propagation delay of 336ps Mode

and channel-to-channel skew of 17ps.

17ps (typ) Channel-to-Channel Skew

The four channels can be operated synchronously with

Integrated 50Ω Outputs (MAX9421/MAX9423)

an external clock, or in asynchronous mode, deter- mined by the state of the SEL input. An enable input Integrated 100Ω Inputs (MAX9422/MAX9423) provides the ability to force all the outputs to a differen-

Synchronous/Asynchronous Operation

tial low state. These devices operate with a negative supply voltage of -2.0V to -3.6V, compatible with LVECL input signals.

Ordering Information

The positive supply range is 2.375V to 3.6V for differen- tial LVPECL output signals.

TEMP PIN- DATA

PART OUTPUT

A variety of input and output terminations are offered for RANGE PACKAGE INPUT

maximum design flexibility. The MAX9420 has open

MAX9420EHJ -40°C to +85°C 32 TQFP Open Open

inputs and open-emitter outputs. The MAX9421 has

MAX9420EGJ* -40°C to +85°C 32 QFN Open Open

open inputs and 50Ω series outputs. The MAX9422 has

MAX9421EHJ -40°C to +85°C 32 TQFP Open 50Ω

100Ω differential input impedance and open-emitter

outputs. The MAX9423 has 100Ω differential input MAX9421EGJ* -40°C to +85°C 32 QFN Open 50Ω

impedance and 50Ω IN series outputs. IN

MAX9422EHJ -40°C to +85°C 32 TQFP 100Ω Open

The MAX9420–MAX9423 are specified for operation IN IN MAX9422EGJ* -40°C to +85°C 32 QFN 100Ω Open from -40°C to +85°C, and are offered in space-saving

MAX9423EHJ -40°C to +85°C 32 TQFP 100Ω 50Ω

32-pin 5mm ✕ 5mm TQFP and 32-lead 5mm ✕ 5mm

OU T3 OU T0 MAX9423EGJ* -40°C to +85°C 32 QFN 100Ω 50Ω

QFN packages.

OU T3 OU T0 *Future product—contact factory for availability.

Applications

GN GN

Data and Clock Driver and Buffer

IN IN

Central Office Backplane Clock Distribution

IN IN

Pin Configurations

DSLAM Backplane

TOP VIEW

Base Station ATE

1VEE VCC

SEL OUT1

SEL OUT1

CLK GND

MAX9420 CLK MAX9421 GND MAX9422

EN OUT2

MAX9423

EN OUT2

Functional Diagram appears at end of data sheet.

8VEE VCC

TQFP (5mm x 5mm)

Pin Configurations continued at end of data sheet.

Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.