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ICS650-14B Datasheet, PDF (1/4 Pages) Integrated Circuit Systems – Networking System Clock | |||
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PRELIMINARY INFORMATION
ICS650-14B
Networking System Clock
Description
The ICS650-14B is a low cost, low jitter, high
performance clock synthesizer customized for
networking systems applications. Using analog
Phase-Locked Loop (PLL) techniques, the device
accepts a 25.0 MHz clock or fundamental mode
crystal input to produce multiple output clocks of
one fixed 25.0 MHz, a four (plus one) frequency
selectable bank, and two frequency selectable
clocks. All output clocks are frequency locked
together. The ICS650R-14B outputs
all have 0 ppm synthesis error.
Block Diagram
Features
⢠Packaged in 20 pin (150 mil) SSOP (QSOP)
⢠25.00 MHz fundamental crystal or clock input
⢠One fixed output clock of one 25.0 MHz
⢠One bank of four frequency selectable
output clocks
⢠Three frequency selectable clock outputs
⢠Zero ppm synthesis error in all clocks
⢠Ideal for networking systems
⢠Full CMOS output swing
⢠Advanced, low power, sub-micron CMOS process
⢠3.0V to 5.5V operating voltage
⢠Industrial temperature range available
2
SELA 0:1
SELB 0:1 2
SELC
VDD GND
22
Clock Synthesis
and Control
Circuitry
25.00 MHz
crystal or clock
X1/ICLK
X2
Clock
Buffer/
Crystal
Oscillator
Output 4
Buffer
Output
Buffer
Output
Buffer
Output
Buffer
CLKA 1:4
CLKA5
CLKB
CLKC
Output
Buffer
25.00 MHz
OE (All outputs)
Optional crystal capacitors are shown and may be required for tuning of initial accuracy (determined once per board).
MDS 650-14B A
1
Revision 082800
Printed 11/15/00
Integrated Circuit Systems, Inc. ⢠525 Race Street ⢠San Jose ⢠CA ⢠95126â¢(408)295-9800tel⢠www.icst.com
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