W254B, W255, W255H /PW255HT Selling Leads, Datasheet
MFG:CYPRESS Package Cooled:N/A D/C:09+
W254B, W255, W255H /PW255HT Datasheet download
Part Number: W254B
MFG: CYPRESS
Package Cooled: N/A
D/C: 09+
W254B, W255, W255H /PW255HT
- Table of contents:
Info of W254B
Info of W255
Info of W255H /PW255HT
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About W255H
PDF/DataSheet Download
Datasheet: W255H
File Size: 132256 KB
Manufacturer: CYPRESS [Cypress Semiconductor]
Download : Click here to Download
About W255H
PDF/DataSheet Download
Datasheet: W255H
File Size: 132256 KB
Manufacturer: CYPRESS [Cypress Semiconductor]
Download : Click here to Download
About W255H
PDF/DataSheet Download
Datasheet: W255H
File Size: 132256 KB
Manufacturer: CYPRESS [Cypress Semiconductor]
Download : Click here to Download
W254B Maximum Ratings
| Absolute Maximum DC Power Supply | ||||
| Parameter | Description | Min. | Max. | Unit |
| VDD3 VDDQ2 |
3.3V Core Supply Voltage 2.5V I/O Supply Voltage |
0.5 0.5 |
4.6 3.6 |
V V |
| VDDQ3 TS |
3.3V Supply Voltage Storage Temperature |
0.5 65 |
4.6 150 |
V |
| Absolute Maximum DC I/O | ||||
| Parameter | Description | Min. | Max. | Unit |
| Vih3 |
3.3V Input High Voltage | 0.5 | 4.6 | V |
| Vil3 ESD prot. |
3.3V Input Low Voltage Input ESD Protection |
0.5 2000 |
V V | |
W254B Features
• Maximized EMI suppression using Cypress's Spread Spectrum technology (0.5% and ±0.5%)
• Single chip system FTG for Mobile Intel® Platforms
• Two CPU outputs
• Seven copies of PCI clock (one Free Running)
• Seven SDRAM clock (one DCLK for Memory Hub)
• Two copies of 48 MHz clock (non-spread spectrum) optimized for USB reference input and video DOT clock
• Three 3V66 Hublink/AGP outputs
• One VCH clock (48 MHz non-SSC or 66.67 MHz SSC)
• One APIC outputs
• One buffered reference output
• Supports frequencies up to 133 MHz
• SMBus interface for programming
• Power management control inputs
• Single chip system FTG for Mobile Intel® Platforms
• Two CPU outputs
• Seven copies of PCI clock (one Free Running)
• Seven SDRAM clock (one DCLK for Memory Hub)
• Two copies of 48 MHz clock (non-spread spectrum) optimized for USB reference input and video DOT clock
• Three 3V66 Hublink/AGP outputs
• One VCH clock (48 MHz non-SSC or 66.67 MHz SSC)
• One APIC outputs
• One buffered reference output
• Supports frequencies up to 133 MHz
• SMBus interface for programming
• Power management control inputs
W254B Connection Diagram
W255 General Description
The W255 is a 3.3V/2.5V buffer designed to distribute high-speed clocks in PC applications. The part has 24 outputs. Designers can configure these outputs to support four unbuffered DDR DIMMS or to support three unbuffered standard SDRAM DIMMs and two DDR DIMMS. The W255 can be used in conjunction with the W250 or similar clock synthesizer for the VIA Pro 266 chipset.
The W255 also includes an SMBus interface which can enable or disable each output clock. On power-up, all output clocks are enabled (internal pull up).
W255 Maximum Ratings
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
(per MIL-STD-883, Method 3015)
DC Input Voltage (except BUF_IN) ............... 0.5V to VDD+0.5
Storage Temperature.................................. 65°C to +150°C
Static Discharge Voltage .............................................. > 2000V
(per MIL-STD-883, Method 3015)
W255 Features
• One input to 24-output buffer/driver
• Supports up to 4 DDR DIMMs or 3 SDRAM DIMMS
• One additional output for feedback
• SMBus interface for individual output control
• Low skew outputs (< 100 ps)
• Supports 266-, 333-, and 400-MHz DDR SDRAM
• Dedicated pin for power management support
• Space-saving 48-pin SSOP package
• Supports up to 4 DDR DIMMs or 3 SDRAM DIMMS
• One additional output for feedback
• SMBus interface for individual output control
• Low skew outputs (< 100 ps)
• Supports 266-, 333-, and 400-MHz DDR SDRAM
• Dedicated pin for power management support
• Space-saving 48-pin SSOP package
W255 Connection Diagram
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