Features: Precision 1:4, LVPECL fanout buffer
Guaranteed AC performance over temperature/ voltage:
• >4GHz fMAX (clock)
• <100ps tr / tf Times
• <300ps tpd
• <15ps max skew
Low jitter performance
• <10pspp total jitter (clock)
• <1psrms random jitter (data)
• <10pspp deterministic jitter (data)
Accepts an input signal as low as 100mV
Unique input termination and VT pin accepts DC-coupled and AC-coupled differential inputs: LVPECL, LVDS, and CML
100k LVPECL compatible 800mV swing output
Power supply 2.5V ±5% and 3.3V ±10%
40°C to +85°C temperature range
Available in 16-pin (3mm * 3mm) MLF™ package
ApplicationAll SONET and All GigE clock distribution
Fibre Channel clock and data distribution
Backplane distribution
High-end, low skew, multiprocessor synchronous clock distribution
Pinout
SpecificationsPower Supply Voltage (VCC ) .................... 0.5V to +4.0V
Input Voltage (VIN) ...................................... 0.5V to VCC
LVPECL Output Current (IOUT)
Continuous ............................................................50mA
Surge ...................................................................100mA
Source or sink current on VT pin
VT Current ........................................................ ±100mA
Source or sink current on IN, /IN
Input Current ..................................................... ±50mA
Source or sink current on VREF-AC(4)
VREF Current .................................................... ±1.5mA
Soldering, (20 seconds) ........................................ 260°C
Storage Temperature Range (TS) .........65°C to +150°C
DescriptionThe SY58021U is a 2.5V/3.3V precision, high-speed, fully differential 1:4 LVPECL fanout buffer. Optimized to provide four identical output copies with less than 15ps of skew and less than 10pspp total jitter, the SY58021U can process clock signals as fast as 4GHz.
The differential input includes Micrel's unique, 3-pin input termination architecture interfaces to differential LVPECL, CML, and LVDS signals (AC- or DC-coupled) as small as 100mV without any level-shifting or termination resistor networks in the signal path. For AC-coupled input interface applications, an on-board output reference voltage (VREFAC) is provided to bias the VT pin. The outputs are 100k LVPECL compatible, with extremely fast rise/fall times guaranteed to be less than 100ps.The SY58021U operates from a 2.5V ±5% supply or 3.3V ±10% supply and is guaranteed over the full industrial temperature range (40°C to +85°C). For applications that require faster rise/fall times, or greater bandwidth, consider the SY58022U 1:4 fanout buffer with 400mV LVPECL output swing, or the SY58020U 1:4 CML fanout buffer. The SY58021U is part of Micrel's high-speed, Precision Edge® product line.All support documentation can be found on Micrel's web site at www.micrel.com.
SY58021U Data Sheet
