1. Overview & Purpose

️· The ICS604 is a clock generator designed for Intel graphics systems. It provides a stable clock signal derived from a crystal oscillator.
️· Primarily used to generate precise clock frequencies for graphics processors.

2. Key Features & Specifications

️· Operating Frequency: Generates frequencies around 14.31818 MHz (crystal input) for derived frequencies like 48.0 MHz and 24.576 MHz.
️· Input: Requires a crystal oscillator (parallel resonant, fundamental mode).
️· Outputs: Provides multiple clock outputs derived from the crystal input.
️· Voltage: Operates with supply voltages VDDC and VDDIO (typically 5V).
️· Package: Available in an 8-pin SOIC package.

3. Absolute Maximum Ratings

️· Supply Voltage (VDDC/VDDIO): -0.5V to 7V
️· Input Voltages: -0.5V to (VDDC + 0.5)V
️· Ambient Operating Temperature: 0°C to 70°C
️· Storage Temperature: -65°C to 150°C

4. Electrical Characteristics (Important Values)

️· Input High Voltage (VIH): (VDDIO/2) + 1V
️· Input Low Voltage (VIL): (VDDIO/2) - 1V
️· Output High Voltage (VOH): VDDIO - 0.4V (at a specific output current)
️· Output Low Voltage (VOL): 0.4V (at a specific output current)
️· Frequency Error (vs. Target): Very low, measured in parts per million (ppm) – critical for accurate timing. Example: at 48.0 MHz, the error is 0 ppm.
️· Jitter: Relatively low jitter values, crucial for reliable clock signals.

5. External Components

️· Decoupling Capacitors: 0.01 µF capacitors are *essential* between VDDC and GND, and VDDIO and GND, placed as close as possible to the IC.
️· Crystal: A parallel resonant, fundamental mode crystal is required. The datasheet provides guidance on selecting the correct crystal and external capacitors for resonant operation. Use formula: C L - 6)*2.
️· Termination Resistors: A 33Ω resistor can be used at the output pins when driving 50Ω lines.

6. Ordering Information

️· ICS604M: 8-pin SOIC, 0°C to 70°C temperature range.
️· ICS604MT: 8-pin SOIC on tape and reel, 0°C to 70°C temperature range.