SY54020AR Datasheet, PDF (1/14 Pages) Micrel Semiconductor – Low Voltage 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer with /EN 3.2Gbps, 3.2GHz

SY54020AR
Low Voltage 1.2V/1.8V/2.5V CML 1:4 Fanout
Buffer with /EN 3.2Gbps, 3.2GHz
General Description
The SY54020AR is a fully differential, low voltage
1.2V/1.8V/2.5V CML 1:4 Fanout Buffer with active-low
Enable (/EN). The Enable is synchronous so that the
outputs will only be enabled/disabled when they are
already in the LOW state. This avoids any chance of
generating a runt clock pulse when the device is
enabled/disabled as can happen with an asynchronous
control. When this device is used as a clock fanout,
disabling the downstream clock may reduce system
power. The SY54020AR can process clock signals as
fast as 3.2 GHz or data patterns up to 3.2Gbps.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that interfaces to LVPECL,
LVDS or CML differential signals as small as 100mV
(200mV_pp) without any level-shifting or termination
resistor networks in the signal path. For AC-coupled
input interface applications, an internal voltage
reference is provided to bias the V_T pin. The outputs are
CML, with extremely fast rise/fall times guaranteed to be
less than 100ps.
The SY54020AR operates from a 2.5V ±5% core supply
and a 1.2V, 1.8V or 2.5V ±5% output supply and is
guaranteed over the full industrial temperature range (–
40°C to +85°C).
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Functional Block Diagram
Features
Precision Edge^®
• 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer
• Active-low Enable (/EN) input to disable the outputs
• Guaranteed AC performance over temperature and
voltage:
– DC-to > 3.2Gbps Data throughput
– DC-to > 3.2GHz Clock throughput
– <320 ps propagation delay (IN-to-Q)
– <20ps within-device skew
– <100 ps rise/fall times
• Ultra-low jitter design
– <1ps_RMS cycle-to-cycle jitter
• High-speed CML outputs
• 2.5V ±5% V_CC , 1.2/1.8V/2.5V ±5% V_CCO power supply
operation
• Industrial temperature range: –40°C to +85°C
• Available in 16-pin (3mm x 3mm) MLF^® package
Applications
• SONET clock and data distribution
• Fibre Channel clock and data distribution
• Gigabit Ethernet clock and data distribution
Markets
• Storage
• ATE
• Test and measurement
• Enterprise networking equipment
• High-end servers
• Access
• Metro area network equipment
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 2009
M9999-041409-A
[e-mail] or [phone]