ICS9148B-04

Features:

· 3.3V outputs: SDRAM, PCI, REF, 48/24MHz
· 2.5V or 3.3V outputs: CPU, IOAPIC
· 20 ohm CPU clock output impedance
· 20 ohm PCI clock output impedance
· Skew from CPU (earlier) to PCI clock - 1 to 4 ns, center 2.6 ns.
· No external load cap for CL=18pF crystals
· ±250 ps CPU, PCI clock skew
· 400ps (cycle to cycle) CPU jitter
· Smooth frequency switch, with selections from 50 to 83.3 MHz CPU.
· I²C interface for programming
· 2ms power up clock stable time
· Clock duty cycle 45-55%.
· 48 pin 300 mil SSOP package
· 3.3V operation, 5V tolerant input.


Pinout




Specifications

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


Description

The ICS9148B-04 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.

Features include four CPU, seven PCI and Twelve SDRAM clocks. Two reference outputs are available equal to the crystal frequency. Plus the IOAPIC output powered by VDDL1. One 48 MHz for USB, and one 24 MHz clock for Super IO. Spread Spectrum built in - ±1.5% modulation to reduce the EMI. Serial programming I²C interface allows changing functions, stop clock programing and Frequency selection. Rise time adjustment for VDD at 3.3V or 2.5V CPU.

Additionally, the ICS9148B-04 meets the Pentium power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up. It is not recommended to use I/O dual function pin for the slots (ISA, PCI, CPU, DIMM). The add on card might have a pull up or pull down.