W256

Features:

• One input to 12 output buffer/drivers
• Supports up to 2 DDR DIMMs or 3 SDRAM DIMMS
• One additional output for feedback
• SMBus interface for individual output control
• Low skew outputs (< 100 ps)
• Supports 266 MHz and 333 MHz DDR SDRAM
• Dedicated pin for power management support
• Space-saving 28-pin SSOP package


Pinout




Specifications

Supply Voltage to Ground Potential .................0.5 to +7.0V
DC Input Voltage (except BUF_IN) ........... 0.5V to VDD+0.5
Storage Temperature ..............................65°C to +150°C
Static Discharge Voltage ............................................>2000V


Description

The W256 is a 3.3V/2.5V buffer designed to distribute high-speed clocks in PC applications. The part has 12 outputs. Designers can configure these outputs to support 3 unbuffered standard SDRAM DIMMs and 2 DDR DIMMs. The W256 can be used in conjunction with the W250-02 or similar clock synthesizer for the VIA Pro 266 chipset.
The W256 also includes an SMBus interface which can enable or disable each output clock. On power-up, all output clocks are enabled (internal pull-up).