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PDF W40S11-02 Data sheet ( Hoja de datos )

Número de pieza W40S11-02
Descripción SDRAM Buffer - 2 DIMM (Mobile)
Fabricantes Cypress Semiconductor 
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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
• I2C 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.
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
Block Diagram
Pin Configuration
SDATA
SCLOCK
Serial Port
Device Control
BUF_IN
OE
SDRAM0
SDRAM1
SDRAM2
SDRAM3
SDRAM4
SDRAM5
SDRAM6
SDRAM7
SDRAM8
SDRAM9
VDD
SDRAM0
SDRAM1
GND
VDD
SDRAM2
SDRAM3
GND
BUF_IN
VDD
SDRAM8
GND
VDD
SDATA [1]
1
2
3
4
5
6
7
8
9
10
11
12
13
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
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. **

1 page




W40S11-02 pdf
W40S11-02
How To Use the Serial Data Interface
Electrical Requirements
Figure 1 illustrates electrical characteristics for the serial inter-
face bus used with the W40S11-02. Devices send data over
the bus with an open drain logic output that can (a) pull the bus
line LOW, or (b) let the bus default to logic 1. The pull-up resis-
tor on the bus (both clock and data lines) establish a default
logic 1. All bus devices generally have logic inputs to receive
data.
Although the W40S11-02 is a receive-only device (no data
write-back capability), it does transmit an acknowledgedata
pulse after each byte is received. Thus, the SDATA line can
both transmit and receive data.
The pull-up resistor should be sized to meet the rise and fall
times specified in AC parameters, taking into consideration to-
tal bus line capacitance.
VDD
VDD
SERIAL BUS DATA LINE
SERIAL BUS CLOCK LINE
CLOCK IN
CLOCK OUT
SDCLK
DATA IN
N DATA OUT
~ 2k
~ 2k
SDATA
N
CLOCK IN
SCLOCK
DATA IN
DATA OUT
SDATA
N
CHIP SET
(SERIAL BUS MASTER TRANSMITTER)
CLOCK DEVICE
(SERIAL BUS SLAVE RECEIVER)
Figure 1. Serial Interface Bus Electrical Characteristics
5

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W40S11-02 arduino
Package Diagrams (continued)
28-Pin Small Shrink Outline Package (SSOP, 209 mils)
W40S11-02
© Cypress Semiconductor Corporation, 1999. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize
its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.

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