LVECL/LVPECL PROGRAMMABLE CLOCK GENERATOR AND 1:15 FANOUT BUFFER
Description
Micrel, Inc.
3.
3V, 1.
5GHz ÷1/÷2 DIFFERENTIAL LVECL/LVPECL PROGRAMMABLE CLOCK
Precision Edge®
PrecisionSYE1d00gEe2®22L
GENERATOR AND 1:15 FANOUT BUFFER
SY100E222L
FEATURES
■ Four programmable output banks and 15 total LVPECL-compatible differential outputs
■ Pin-compatible, plug-in replacement to MC100LVE222FA
■ fMAX clock = 1.
5GHz ■ 50ps output-to-output skew ■ Four output banks with independent ÷1, ÷2
frequency control ■ 100k compatible I/O ■ Power supply 3.
3V ±10% ■ –40°C to +85°C temperature range ■ Available in 52-pin LQFP package
APPLICATIONS
■ SONET/SDH channel applications ■ Fibre Channel multi-channel applications ■ Gigabit Ethernet multi-channel applications
FUNCTIONAL BLOCK DIAGRAM
CLK_SEL
CLK0 /CLK0
VBB CLK1
/CLK1
MR FSELA
2:1 MUX
÷1 CLK
÷2
FSELB
FSELC FSELD
2:1 MUX
2:1 MUX
2:1 MUX
2:1 MUX
1:2 FOB QA0 /QA0
QA1 /QA1 1:3 FOB QB0 /QB0
QB1 /QB1
QB2 /QB2 1:4 FOB QC0 /QC0
QC1 /QC1
QC2 /QC2
QC3 /QC3 1:6 FOB QD0 /QD0
QD1 /QD1
QD2 /QD2
QD3 /QD3
QD4 /QD4
QD5 /QD5
Precision Edge is a registered trademark of Micrel, Inc.
M9999-021511 hbwhelp@micrel.
com or (408) 955-1690
DESCRIPTION
Precision Edge®
The SY100E222L is a low-skew, low-jitter device capable of receiving a high-speed LVECL/LVPECL input in either a single-ended or differential configuration.
For single-ended configurations, a VBB output reference is supplied by the SY100E222L.
A 2:1 input multiplexer selects from two differential input pairs by means of the CLK_SEL input select.
The internal programmable divider for each of the four banks generates a ÷1 or ÷2 frequency of the selected input.
The ÷1/÷2 divider outputs can be asynchronously synchronized with the master reset (MR) input so that the outputs will start out in a known state.
The 15 total outputs are partitioned into four independently selected output banks in a 2/3/4/6 fanout configuration.
Each of the four banks can independently select the ÷1 or ÷2 output frequency by means of the four separate frequency select pins (FSELA-FSEL...
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