SY58621L

Precision 3.2Gbps CML/LVPECL Backplane

Transceiver with Integrated Loopback

Precision Edge is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

January 2006

M9999-012006-B

General Description

The SY58621L is a low jitter, high-speed transceiver

with a variable swing LVPECL transmitter buffer and a

CML high-gain receiver optimized for precision telecom

and enterprise server transmission line and backplane

data management. The SY58621L distributes data to

3.2Gbps guaranteed over temperature and voltage.

The SY58621L transmitter differential input includes

Micrel’s unique, patented 3-pin input termination

architecture that directly interfaces to any (AC- or DC-

coupled) differential signal as small as 100mV

the signal path. The receiver differential input is

optimized to interface directly to AC-coupled signals as

source-terminated CML and the transmitter output is

variable swing 80mV to 800mV LVPECL with extremely

fast rise/fall time.

To support remote self-testing, the SY58621L features a

high-speed loopback test mode. The input control signal

LOOPBACK enables an internal loopback path from the

transmitter input to the receiver output.

The SY58621L operates from a 3.3V ±10% supply and

is guaranteed over the full industrial temperature range

of –40°C to +85°C. The SY58621L is part of Micrel’s

high-speed, Precision Edge

®

product line. For

applications that requires a CML receiver and

transmitter, consider the SY58620L.

All support documentation can be found on Micrel’s web

Applications

∑ Backplane management

∑ Active cable transceivers

∑ SONET/SDH data/clock applications

∑ 4X Fibre Channel applications

Precision Edge

®

Features

∑ Guaranteed AC performance over temperature and

voltage:

- Maximum Throughput 3.2Gbps

∑ Transmitter

- Patented input termination directly interfaces to AC-

or DC-coupled differential inputs

- Variable swing LVPECL output

∑ Receiver

- 32dB high-gain Input

- Internal 50Ω input termination

- Accepts AC-coupled input signals as small as 10mV

∑ Loss-of-Signal (LOS)

- High-gain, TTL-compatible LOS output with internal

4.75kΩ pull-up

- Programmable LOS level set

∑ Ultra-low jitter design

∑ Patent-pending MUX isolates the receiver and the

transmitter channels minimizing on crosstalk

∑ Selectable loopback diagnostic mode

∑ Output enables on transmitter and receiver outputs

∑ Power supply +3.3V ±10%

∑ Industrial temperature range -40°C to +85°C

∑ Available in 24-pin (4mm x 4mm) QFN

Markets

∑ Precision telecom

∑ Enterprise server

∑ ATE

∑ Test and measurement