ICS9341
ICS9341 is 133MHz Clock Generator and Integrated Buffer manufactured by Renesas.
Description
The ICS9341 generates all clocks required for high speed Power PC RISC microprocessor systems. Generating clocks in phase with an external reference frequency. Spread Spectrum may be enabled by driving the SS_EN pin active. Spread spectrum typically reduces system EMI by 8d B to 10d B. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9341 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.
Block Diagram
Features
Generates the following system clocks:
- 4-CPUA (3.3V, up to 133MHz)
- 4-CPUB (3.3V, up to 133MHz)
- 8-PCI (3.3V, 33.3MHz)
- 1-OUT (3.3v, 64MHz)
- 1-OUT/2 (3.3V, OUT/2MHz)
- 2-REF (3.3V, 14.318MHz)
Up to 133MHz frequency support.
Stop clocks for power management Spread Spectrum for EMI control
±.25% center spread
Skew characteristics:
- CPU
- CPU: <350ps
- CPU
- PCI: <500ps
- PCI
- PCI: <500ps
X1
X2
CPUB_STOP# OUT_SEL (0:1)
PCI_STOP# SS_EN
PLL Spread Spectrum
C o n t r
PLL2 o l
PD#
/4 /2
STOP
/3 /6 /5
/2
/4 /5 /6 /8
STOP
Power Groups:
VDDREF, GNDREF = REF, X1, X2 GNDPCI, VDDPCI = PCICLK VDD66, GND66 = 3V66 VDD48, GND48 = 48MHz VDDCOR, GNDCOR = PLL Core VDDLCPU/2 , GNDLCPU/2 = CPU/2 VDDLIOAPIC, GNDIOAPIC = IOAPIC
2 REF (0:1) CPUCLKA...
