General Description

The MAX9390/MAX9391 dual 2 x 2 crosspoint switches

perform high-speed, low-power, and low-noise signal

distribution. The MAX9390/MAX9391 multiplex one of two

differential input pairs to either or both low-voltage differ-

ential signaling (LVDS) outputs for each channel.

Independent enable inputs turn on or turn off each differ-

ential output pair.

Four LVCMOS/LVTTL logic inputs (two per channel) con-

trol the internal connections between inputs and outputs.

This flexibility allows for the following configurations: 2 x 2

crosspoint switch, 2:1 mux, 1:2 splitter, or dual repeater.

This makes the MAX9390/MAX9391 ideal for protection

switching in fault-tolerant systems, loopback switching for

diagnostics, fanout buffering for clock/data distribution,

and signal regeneration.

Fail-safe circuitry forces the outputs to a differential low

condition for undriven inputs or when the common-

mode voltage exceeds the specified range. The

MAX9390 provides high-level input fail-safe detection

for LVDS, HSTL, and other GND-referenced differential

inputs. The MAX9391 provides low-level input fail-safe

differential inputs.

(PRBS) jitter ensures reliable communications in high-

speed links that are highly sensitive to timing error,

especially those incorporating clock-and-data recovery,

or serializers and deserializers. The high-speed switch-

ing performance guarantees 1.5GHz operation and less

than 65ps (max) skew between channels.

LVDS inputs and outputs are compatible with the

TIA/EIA-644 LVDS standard. The LVDS outputs drive

100

Ω loads. The MAX9390/MAX9391 are offered in a

32-pin TQFP and 5mm x 5mm thin QFN package with

exposed paddle and operate over the extended tem-

perature range (-40°C to +85°C).

Also refer to the MAX9392/MAX9393 with flow-through

pinout.

Applications

High-Speed Telecom/Datacom Equipment

Central-Office Backplane Clock Distribution

DSLAM

Protection Switching

Fault-Tolerant Systems

Features

o 1.5GHz Operation with 250mV Differential Output

Swing

o AC Specifications Guaranteed for 150mV

Differential Input

o Signal Inputs Accept Any Differential Signaling

Standard

o LVDS Outputs for Clock or High-Speed Data

o High-Level Input Fail-Safe Detection (MAX9390)

o Low-Level Input Fail-Safe Detection (MAX9391)

o +3.0V to +3.6V Supply Voltage Range

o LVCMOS/LVTTL Logic Inputs Control Signal

Routing

Anything-to-LVDS Dual 2 x 2

Crosspoint Switches

________________________________________________________________ Maxim Integrated Products

1

TOP VIEW

MAX9390

MAX9391

TQFP

32

28

29

30

31

25

26

27

10

13

15

14

16

11

12

9

17

18

19

20

21

22

23 OUTA0

OUTA0

ENA0

GND

OUTA1

OUTA1

ENA1

2

3

4

5

6

7

8

OUTB0

OUTB0

GND

OUTB1

OUTB1

1

ENB1

ENB0

PART

TEMP RANGE

PIN-PACKAGE

MAX9390EHJ

-40°C to +85°C

32 TQFP

MAX9390ETJ*

-40°C to +85°C

32 Thin QFN

MAX9391EHJ

-40°C to +85°C

32 TQFP

MAX9391ETJ*

-40°C to +85°C

32 Thin QFN

Pin Configurations

Ordering Information

19-2829; Rev 1; 7/03

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.

*Future product—contact factory for availability.

Pin Configurations continued at end of data sheet.

Functional Diagram and Typical Operating Circuit appear at

end of data sheet.