W40S11-23 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – Clock Buffer/Driver

W40S11-23
Features
• Thirteen skew-controlled CMOS clock outputs
(SDRAM0:12)
• Supports three SDRAM DIMMs
• Ideal for high-performance systems designed around
Intel’s latest chip set
• I²C serial configuration interface
• Clock 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, 300-mil
SOIC (Small Outline Integrated Circuit)
Overview
The Cypress W40S11-23 is a low-voltage, thirteen-output
clock buffer. Output buffer impedance is approximately 15Ω,
which is ideal for driving SDRAM DIMMs.
Block Diagram
Clock Buffer/Driver
Key Specifications
Supply Voltages:........................................... V_DD = 3.3V±5%
Operating Temperature:.................................... 0°C to +70°C
Input Threshold: .................................................. 1.5V typical
Maximum Input Voltage: .......................................V_DD + 0.5V
Input Frequency:............................................... 0 to 133 MHz
BUF_IN to SDRAM0:12 Propagation Delay: ...... 1.0 to 5.0 ns
Output Edge Rate:.............................................. >1.5 V/ns
Output Clock Skew: .................................................. ±250 ps
Output Duty Cycle: .................................. 45/55% worst case
Output Impedance: ...............................................15Ω typical
Output Type: ................................................ CMOS rail-to-rail
Pin Configuration
SDATA
SCLOCK
Serial Port
Device Control
BUF_IN
SDRAM0
SDRAM1
SDRAM2
SDRAM3
SDRAM4
SDRAM5
SDRAM6
SDRAM7
SDRAM8
SDRAM9
SDRAM10
SDRAM11
SDRAM12
SOIC
VDD 1
SDRAM0 2
SDRAM1 3
GND 4
VDD 5
SDRAM2 6
SDRAM3 7
GND 8
BUF_IN 9
SDRAM4 10
SDRAM5 11
SDRAM12 12
VDD 13
SDATA^[1]
14
28 VDD
27 SDRAM11
26 SDRAM10
25 GND
24 VDD
23 SDRAM9
22 SDRAM8
21 GND
20 VDD
19 SDRAM7
18 SDRAM6
17 GND
16
15
GSCNLDOCK_[1]
Note:
1. Internal pull-up resistor of 250K on SDATA and SCLOCK inputs
(not CMOS level).
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
September 28, 1999 rev. **