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W40S11-02 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – SDRAM Buffer - 2 DIMM (Mobile)
W40S11-02
SDRAM Buffer - 2 DIMM (Mobile)
Features
• Ten skew-controlled CMOS outputs (SDRAM0:9)
• Supports two SDRAM DIMMs
• Ideal for high-performance systems designed around
Intel®’s latest mobile chip set
• SMBus serial configuration interface
• Skew between any two outputs is less than 250 ps
• 1 to 5 ns propagation delay
• DC to 133-MHz operation
• Single 3.3V supply voltage
• Low power CMOS design packaged in a 28-pin, 209-mil
SSOP (Shrink Small Outline Package)
Overview
The Cypress W40S11-02 is a low-voltage, ten-output clock
buffer. Output buffer impedance is approximately 15:, which
is ideal for driving SDRAM DIMMs.
Block Diagram
Key Specifications
Supply Voltages: ........................................... VDD = 3.3V±5%
Operating Temperature:.................................... 0°C to +70°C
Input Threshold:...................................................1.5V typical
Maximum Input Voltage: ...................................... VDD + 0.5V
Input Frequency:...............................................0 to 133 MHz
BUF_IN to SDRAM0:9 Propagation Delay:........ 1.0 to 5.0 ns
Output Edge Rate: ................................................. >1.5 V/ns
Output Skew: ............................................................ ±250 ps
Output Duty Cycle:...................................45/55% worst case
Output Impedance: ....................................... 15 ohms typical
Output Type: ............................................... CMOS rail-to-rail
Pin Configuration
SDATA
SCLOCK
Serial Port
Device Control
BUF_IN
OE
SDRAM0
SDRAM1
SDRAM2
SDRAM3
SDRAM4
SDRAM5
SDRAM6
SDRAM7
SDRAM8
SDRAM9
VDD 1
SDRAM0 2
SDRAM1 3
GND 4
VDD 5
SDRAM2 6
SDRAM3 7
GND 8
BUF_IN 9
VDD 10
SDRAM8 11
GND 12
VDD 13
SDATA [1] 14
28 VDD
27 SDRAM7
26 SDRAM6
25 GND
24 VDD
23 SDRAM5
22 SDRAM4
21 GND
20 OE [1]
19 VDD
18 SDRAM9
17 GND
16 GND
15 SCLOCK[1]
Note:
1. Internal pull-up resistor of 250K on SDATA, SCLOCK, and OE in-
puts (should not be relied upon for pulling up to VDD).
Rev 1.0, Dec. 01, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:(408) 855-0555 Fax:(408) 855-0550
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