Clock Fanout Buffer 18-OUT 48-Pin SSOP

The CY2318ANZ is a 3.3V buffer designed to distribute high-speed clocks in PC applications. The part has 18 outputs, 16 of which can be used to drive up to four SDRAM DIMMs, and the remaining can be used for external feedback to a PLL. The device operates at 3.3V and outputs can run up to 100 MHz, thus making it compatible with Pentium II processors. The CY2318ANZ can be used in conjunction with the CY2280, CY2281, CY2282 or similar clock synthesizer for a complete Pentium II motherboard solution. The CY2318ANZ also includes an I2C interface which can enable or disable each output clock. On power-up, all output clocks are enabled (internal pull up). A separate Output Enable pin facilitates testing on ATE.

• One input to 18 output buffer/driver
• Supports up to four SDRAM DIMMs
• Two additional outputs for feedback
• I2C™ interface for individual output control
• Low skew outputs (< 250 ps)
• Up to 100 MHz operation
• Dedicated OE pin for testing
• Space-saving 48-pin SSOP package
• 3.3V operation