W40S11-02
SDRAM Buffer - 2 DIMM (Mobile)
Features
Key Specifications
• Ten skew-controlled CMOS outputs (SDRAM0:9)
• Supports two SDRAM DIMMs
Supply Voltages:........................................... V = 3.3V±5%
DD
Operating Temperature:.................................... 0°C to +70°C
Input Threshold: .................................................. 1.5V typical
• Ideal for high-performance systems designed around
Intel®’s latest Mobile chip set
2
Maximum Input Voltage:.......................................V + 0.5V
DD
• I C Serial configuration interface
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
• 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 15Ω, which
is ideal for driving SDRAM DIMMs.
Pin Configuration
Block Diagram
SDATA
SCLOCK
Serial Port
Device Control
VDD
SDRAM0
SDRAM1
GND
1
2
3
4
5
6
7
8
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VDD
SDRAM7
SDRAM6
GND
OE
SDRAM0
SDRAM1
VDD
VDD
SDRAM2
SDRAM3
GND
BUF_IN
VDD
SDRAM5
SDRAM4
GND
SDRAM2
SDRAM3
SDRAM4
SDRAM5
SDRAM6
[1]
9
OE
10
11
12
13
14
VDD
SDRAM9
GND
GND
SCLOCK
SDRAM8
GND
VDD
[1]
[1]
SDATA
SDRAM7
SDRAM8
SDRAM9
BUF_IN
Note:
1. Internal pull-up resistor of 250K on SDATA, SCLOCK, and OE
inputs (should not be relied upon for pulling up to VDD).
Intel is a registered trademark of Intel Corporation.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
September 29, 1999, rev. **