( DataSheet : www.DataSheet4U.com )
ICS650-07B Broadcom Clock Source
Description
The ICS650-07B is a low cost, low jitt...
( DataSheet : www.DataSheet4U.com )
ICS650-07B Broadcom Clock Source
Description
The ICS650-07B is a low cost, low jitter, high performance clock synthesizer customized for Broadcom. Using analog Phase-Locked Loop (PLL) techniques, the device accepts a 25.00 MHz clock or fundamental mode crystal input to produce multiple output clocks of 25.0 MHz, two 125.0 MHz, 133.33 MHz, and a selectable 33.3/66.6 MHz clock. All output clocks are frequency locked together. The ICS650-07B outputs all have 0 ppm synthesis error. Do not use the 125 MHz outputs to drive Gigabit Ethernet SERDES. Instead, the 25 MHz clock can be driven into our ICS601 in the X5 mode. The ICS601 has low enough jitter and phase noise for all popular SERDES.
Features
Packaged in 20 pin narrow (150 mil) SSOP (QSOP) 25.00 MHz fundamental crystal or clock input Four fixed output clocks of 25 MHz, 133.33 MHz, and two copies of 125 MHz One selectable output clock of 33.3 or 66.6 MHz Zero ppm synthesis error in all clocks PCI clock switching occurs within 1 µs Ideal for Broadcom’s BCM5600 chipset Full
CMOS output swing Advanced, low power, sub-micron
CMOS process 3.0 V to 5.5 V operating
voltage
Block Diagram
VDD GND
4
3
Output Buffer
PCI CLK 125.00 MHz 125.00 MHz 133.33 MHz
PS
Clock Synthesis and Control Circuitry
Output Buffer Output Buffer
25.00 MHz crystal or clock
X1 Clock Buffer/ Crystal Oscillator
Output Buffer
Output Buffer
25.00 MHz
X2
OE (all outputs)
Optional crystal capacito...