| Part Number | ICS9248-50 |
| Manufacturer | Integrated Circuit Systems |
| Title | Frequency Generator & Integrated Buffers |
| Description | The ICS9248-50 is the Main clock solution for Notebook designs using the Intel 440BX style chipset. Along with an SDRAM buffer such as the ICS9179... |
| Features |
• Generates the following system clocks: - 2 CPU (2.5V) up to 100MHz. - 6 PCI (3.3V) @ 33.3MHz (Includes one free running). - 2 REF clks (3.3V) at 14.318MHz. Skew characteristics: - CPU – CPU175ps - PCI – PCI 500ps - CPU(early) – PCI = 1.5ns – 4ns. Supports Spread Spectrum modulation for CPU and ... |
| File Size | 261.94KB |
| Datasheet |
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ICS9248-55 : The ICS9248-55 is a Clock Synthesizer chip for Pentium and PentiumPro CPU based Desktop/Notebook systems that will provide all necessary clock timing. Features include four CPU and eight PCI clocks. Three reference outputs are available equal to the crystal frequency. Additionally, the device meets the Pentium power-up stabilization requirement, assuring that CPU and PCI clocks are stable within 2ms after power-up. PD# pin enables low power mode by stopping crystal OSC and PLL stages. Other power management features include CPU_STOP#, which stops CPU (0:3) clocks, and PCI_STOP#, which stops PCICLK (0:6) clocks. High drive CPUCLK outputs typically provide greater than 1 V/ns slew rate into 20.
ICS9248-55 : The ICS9248-55 is a Clock Synthesizer chip for Pentium and PentiumPro CPU based Desktop/Notebook systems that will provide all necessary clock timing. Features include four CPU and eight PCI clocks. Three reference outputs are available equal to the crystal frequency. Additionally, the device meets the Pentium power-up stabilization requirement, assuring that CPU and PCI clocks are stable within 2ms after power-up. PD# pin enables low power mode by stopping crystal OSC and PLL stages. Other power management features include CPU_STOP#, which stops CPU (0:3) clocks, and PCI_STOP#, which stops PCICLK (0:6) clocks. High drive CPUCLK outputs typically provide greater than 1 V/ns slew rate into 20.
ICS9248-56 : The ICS9248-56 is the Main clock solution for Notebook designs using the Intel 440BX style chipset. Along with an SDRAM buffer such as the ICS9179-03, it provides all necessary clock signals for such a system. Spread spectrum may be enabled by driving pin 26, SPREAD# active (Low) at power-on. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-56 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. Features • Generates the following system clocks: - 2CPU(2.5V) up to 100MHz. - 6 PCI(3.3V) @ 33.