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MAX3890ECB

+3.3V, 2.5Gbps, SDH/SONET 16:1 Serializer with Clock Synthesis and LVDS Inputs

Maxim Integrated 

19-1498; Rev 1; 12/99

EVAALVUAAILTAIOBNLEKIT

+3.3V, 2.5Gbps, SDH/SONET 16:1 Serializer

with Clock Synthesis and LVDS Inputs

General Description

The MAX3890 serializer is ideal for converting 16-bit-

wide, 155Mbps parallel data to 2.5Gbps serial data in

ATM and SDH/SONET applications. Operating from a

single +3.3V supply, this device accepts low-voltage

differential-signal (LVDS) clock and data inputs for

interfacing with high-speed digital circuitry, and deliv-

ers positive-referenced emitter-coupled logic (PECL)

serial data and clock outputs. A fully integrated phase-

locked loop (PLL) synthesizes an internal 2.5GHz serial

clock from a 155.52MHz, 77.76MHz, 51.84MHz, or

38.88MHz reference clock. A loopback data output is

provided to facilitate system diagnostic testing.

The MAX3890 is available in the extended temperature

range (-40°C to +85°C) in a 64-pin TQFP exposed-pad

(EP) package.

Applications

2.5Gbps SDH/SONET Transmission Systems

2.5Gbps ATM/SONET Access Nodes

Add/Drop Multiplexers

Digital Cross-Connects

ATM Backplanes

Features

o Single +3.3V Supply

o 495mW Power Consumption

o Exceeds ANSI, ITU, and Bellcore Specifications

o 155Mbps (16-bit wide) Parallel to 2.5Gbps Serial

Conversion

o Clock Synthesis for 2.5Gbps

o Multiple Clock Reference Frequencies

(155.52MHz, 77.76MHz, 51.84MHz, 38.88MHz)

o LVDS Parallel Clock and Data Inputs

o Additional High-Speed Output for System

Loopback Testing

Ordering Information

PART

TEMP. RANGE

MAX3890ECB

-40°C to +85°C

*EP = Exposed pad

PIN-PACKAGE

64 TQFP-EP*

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

155MHz REF CLOCK INPUT

+3.3V TTL

OVERHEAD

GENERATION

PDI0+ RCLK+ RCLK- CLKSET VCC SOS

PDI0-

SDO+

SDO-

PDI15+

PDI15-

PCLKI+

MAX3890

PCLKI-

PCLKO+

PCLKO-

GND

FIL+

SCLKO+

SCLKO-

FIL- SLBO+ SLBO-

330nF

THIS SYMBOL REPRESENTS A TRANSMISSION LINE

OF CHARACTERISTIC IMPEDANCE (Z0 = 50Ω).

+3.3V

130Ω

130Ω

+3.3V

VCC

82Ω

82Ω +3.3V

MAX3867

130Ω

130Ω

82Ω

82Ω

OPTIONAL CONNECTION TO MAX3880

FOR SYSTEM LOOPBACK TESTING.

________________________________________________________________ Maxim Integrated Products 1

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

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