ICS9248BF-195

Overview

The ICS9248BF-195 is a frequency generator and integrated buffer designed for notebook applications utilizing Intel Pentium II/III or AMD K6 processors with chipset architectures such as the 440BX, MX, or VIA PM/PL/PLE. It generates up to 25 clock outputs from a single 14.318MHz crystal input, supporting frequencies up to 140MHz. The device operates on a 3.135V to 3.465V supply within a commercial temperature range of 0°C to 70°C. Key features include spread spectrum modulation for EMI reduction and I2C programmability for power management control.

Feature Summary

• Generates 25 buffered clock outputs including CPU, SDRAM, PCI, and reference signals.
• Supports spread spectrum modulation to reduce system EMI by 8dB to 10dB.
• Enables power management functions (CLK, PCI, stop, and power down modes) via I2C programming.
• Utilizes an external 14.318MHz crystal oscillator for clock generation.

Applications

• Notebook designs using Intel Pentium II/III processors.
• Systems based on AMD K6 processors.
• Motherboards with 440BX, MX, or VIA PM/PL/PLE 133 style chipsets.

Procurement Notes

Verify that the specific ordering suffix matches the required package type and lead-free status. Confirm the revision designator aligns with the intended hardware version. Ensure the supplier provides documentation confirming the component meets the specified electrical characteristics for the target operating temperature range.

Selection Notes

Select this component for systems requiring a single-chip solution for multiple clock domains in legacy notebook platforms. Ensure the design supports the required 14.318MHz crystal input. Verify that the I2C interface is available for configuring frequency selection and power management states according to the system's power requirements.

Part Context

This part belongs to the ICS9248 series of frequency generators. The 'BF' designation indicates the specific package variant, which is a 48-pin SSOP. The '-195' suffix identifies the specific frequency configuration and feature set tailored for Pentium II/III and K6 processor platforms.

Replacement Considerations

Direct replacements must match the 48-SSOP package and pinout. Compatible alternatives include other ICS9248 variants with different suffixes if the frequency and voltage requirements are identical. Cross-model substitution requires verification of register compatibility and output drive strengths.

FAQ

How is the frequency selected?

Frequency can be selected via hardware latched inputs (FS pins) at power-up or dynamically controlled through I2C programming.

What is the maximum supported frequency?

The device supports frequencies up to 140MHz, with typical configurations supporting up to 137MHz.

Does the device support EMI reduction?

Yes, it includes spread spectrum modulation capabilities that can reduce system EMI by 8dB to 10dB.