General Description

The MAX9121/MAX9122 quad low-voltage differential sig-

naling (LVDS) differential line receivers are ideal for appli-

cations requiring high data rates, low power, and low

noise. The MAX9121/MAX9122 are guaranteed to receive

data at speeds up to 500Mbps (250MHz) over controlled-

impedance media of approximately 100

Ω. The transmis-

sion media may be printed circuit (PC) board traces or

cables.

The MAX9121/MAX9122 accept four LVDS differential

inputs and translate them to LVCMOS outputs. The

MAX9122 features integrated parallel termination resis-

tors (nominally 107

Ω), which eliminate the requirement

for four discrete termination resistors and reduce stub

lengths. The MAX9121 inputs are high impedance and

require an external termination resistor when used in a

point-to-point connection.

The devices support a wide common-mode input range of

0.05V to 2.35V, allowing for ground potential differences

and common-mode noise between the driver and the

receiver. A fail-safe feature sets the output high when the

inputs are open, or when the inputs are undriven and

shorted or parallel terminated. The EN and EN inputs con-

trol the high-impedance output. The enables are common

to all four receivers. Inputs conform to the ANSI TIA/EIA-

644 LVDS standard. Flow-through pinout simplifies PC

board layout and reduces crosstalk by separating the

LVDS inputs and LVCMOS outputs. The MAX9121/

MAX9122 operate from a single +3.3V supply, and are

specified for operation from -40°C to +85°C. These

devices are available in 16-pin TSSOP and SO packages.

Refer to the MAX9123 data sheet for a quad LVDS line dri-

ver with flow-through pinout.

Applications

Digital Copiers

Laser Printers

Cellular Phone Base Stations

Add/Drop Muxes

Digital Cross-Connects

DSLAMs

Network Switches/Routers

Backplane Interconnect

Clock Distribution

____________________________Features

o Integrated Termination Eliminates Four External

Resistors (MAX9122)

o Flow-Through Pinout

Simplifies PC Board Layout

Reduces Crosstalk

o Pin Compatible with DS90LV048A

o Guaranteed 500Mbps Data Rate

o 300ps Pulse Skew (max)

o Conform to ANSI TIA/EIA-644 LVDS Standard

o Single +3.3V Supply

o Fail-Safe Circuit

Quad LVDS Line Receivers with

Integrated Termination and Flow-Through Pinout

________________________________________________________________ Maxim Integrated Products

1

Typical Application Circuit

19-1909; Rev 0; 6/01

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.

EVALUATION

KIT

AVAILABLE

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX9121EUE

-40

°C to +85°C

16 TSSOP

MAX9121ESE

-40

°C to +85°C

16 SO

MAX9122EUE

-40

°C to +85°C

16 TSSOP

MAX9122ESE

-40

°C to +85°C

16 SO

Pin Configuration appears at end of data sheet.

MAX9123

MAX9122

107

Ω

107

Ω

107

Ω

107

Ω

100

Ω SHIELDED TWISTED CABLE OR MICROSTRIP PC BOARD TRACES

LVDS SIGNALS

LVTTL/LVCMOS

DATA OUTPUT

LVTTL/LVCMOS

DATA INPUT