ICS9148-82

Features:

·Generates the following system clocks:
             - 3 CPU(2.5V/3.3V) upto 100MHz.
             - 6 PCI(3.3V) @ 33.3MHz
             - 3AGP(3.3V) @ 2 x PCI
             - 13 SDRAMs(3.3V) up to 100MHz
             - 1 REF (3.3V) @ 14.318MHz
·Skew characteristics:
             - CPU - CPU<250ps
             - CPU(early) ñ PCI : 1-4ns, Center 2.6ns
             - AGP - PCI: 500ps
·Supports Spread Spectrum modulation & I2C programming for Power Management, Frequency Select
·Efficient Power management scheme through PCI and CPU STOP CLOCKS.
·Uses external 14.318MHz crystal
·48 pin 300mil SSOP.


Pinout




Specifications

Supply Voltage . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .  . . . . . 7.0 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . .. . GND - 0.5 V to VDD +0.5 V
Ambient Operating Temperature . . . . . . . .  . . .. . .. . ..  0 to +70
Storage Temperature . . . . . . . . . . . . . . . . . . .. . . . . -65 to +150


Description

The ICS9148-82 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix. Eight different reference frequency multiplying factors are externally selectable with smooth frequency transitions. Spread spectrum may be enabled through I2C programming.

Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9148-82 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.

Serial programming I2C interface allows changing functions, stop clock programming and frequency selection. The SDRAM12 output may be used as a feed back into an off chip PLL.