SY58621L
Precision 3.2Gbps CML/LVPECL Backplane
Transceiver with Integrated Loopback
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.
Precision Edge®
Features
∑ Guaranteed AC performance over temperature and
voltage:
- Maximum Throughput 3.2Gbps
- <160ps tr/tf time
∑ Transmitter
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
(200mVPP) without any termination resistor network in
the signal path. The receiver differential input is
optimized to interface directly to AC-coupled signals as
small as 10mV (20mVPP). The receiver output is 50_
source-terminated CML and the transmitter output is
variable swing 80mV to 800mV LVPECL with extremely
fast rise/fall time.
- 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
(20mvPP)
- 400mV (800mVPP) differential CML output swing
∑ Loss-of-Signal (LOS)
- High-gain, TTL-compatible LOS output with internal
4.75kΩ pull-up
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.
- Programmable LOS level set
∑ Ultra-low jitter design
- <5psRMS random jitter
∑ 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%
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
site at: www.micrel.com.
∑ Industrial temperature range -40°C to +85°C
∑ Available in 24-pin (4mm x 4mm) QFN
Applications
∑ Backplane management
Markets
∑ Active cable transceivers
∑ Precision telecom
∑ Enterprise server
∑ ATE
∑ SONET/SDH data/clock applications
∑ 4X Fibre Channel applications
∑ Test and measurement
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
M9999-012006-B
hbwhelp@micrel.com or (408) 955-1690
January 2006