2023 Microchip Technology Inc. and its subsidiaries DS20006800A-page 1
SY58022U
Features
• Precision 1:4, 400 mV LVPECL Fanout Buffer
• Ensured AC Performance over Temperature and 
Voltage:
- >5.5 GHz fMAX Clock
- <80 ps tr/tf Times
- <250 ps (VIN ≥300 mV) tPD
- <15 ps Maximum Skew
• Low Jitter Performance: 60 fsRMS Phase Jitter
• Accepts an Input Signal as Low as 100 mV
• Unique Input Termination and VT Pin Accepts DC- 
and AC-Coupled Differential Inputs: LVPECL, 
LVDS, and CML
• 400 mV LVPECL Compatible Outputs
• Power Supply: 2.5V ±5% and 3.3V ±10%
• –40°C to +85°C Temperature Range
• Available in a 16-Lead 3 mm x 3 mm VQFN 
Package
Applications
• All SONET and All GigE Clock Distribution
• Fibre Channel Clock and Data Distribution
• Backplane Distribution
• Data Distribution: OC-48, OC-48+FEC, XAUI
• High-End, Low-Skew, Multiprocessor 
Synchronous Clock Distribution
General Description
The  SY58022U  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 15 ps
of  skew  and  less  than  10 ps
PP  total  jitter,  the
SY58022U  can  process  clock  signals  as  fast  as
5.5 GHz.
The differential input includes Microchip’s unique, 3-pin
input  termination architecture  interfaces to differential
LVPECL, CML, and LVDS signals (AC- or DC-coupled)
as  small  as  100 mV  without  any  level-shifting  or
termination  resistor  networks  in  the  signal  path.  For
AC-coupled  input  interface  applications,  an  on-board
output reference voltage (VREF-AC) is provided to bias
the  VT  pin.  The  outputs  are  400 mV  LVPECL
compatible with extremely fast rise/fall times ensured to
be less than 80 ps.
The  SY58022U  operates  from a  2.5V  ±5%  supply or
3.3V ±10% supply and is ensured over the full industrial
temperature range (–40°C to +85°C). For applications
that  require  greater output  swing  or  CML  compatible
outputs, consider the SY58021U 1:4 fanout buffer with
LVPECL  outputs,  or  the  SY58020U  1:4  fanout  buffer
with 400 mV CML outputs.
Package Type
SY58022U
3 mm x 3 mm VQFN (M)
(Top View)