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W234_02 Datasheet, PDF (1/14 Pages) Cypress Semiconductor – Dual Direct Rambus™ Clock Generator
W234
Dual Direct Rambus™ Clock Generator
Features
• Differential clock source for Direct Rambus™ memory
subsystem for up to 1.6-Gb/s serial data transfer rate
• Provide synchronization flexibility: the Rambus® Chan-
nel can optionally be synchronous to an external sys-
tem or processor clock
• Power managed output allows Rambus Channel clock
to be turned off to minimize power consumption for
mobile applications
• Works with Cypress CY2210-2, CY2210-3, CY2215,
W133, W158, W159, W161, and W167B to support Intel®
architecture platforms
• Low-power CMOS design packaged in a 28-pin, 173-mil
TSSOP package
Overview
The Cypress W234 provides dual channel differential clock
signals for a Direct Rambus memory subsystem. It includes
signals to synchronize the Direct Rambus Channel clock to an
external system clock but can also be used in systems that do
not require synchronization of the Rambus clock.
Key Specifications
Supply Voltage: ................................... VDD = 3.3V ± 0.165V
Operating Temperature: ................................... 0°C to +70°C
Input Threshold: .................................................. 1.5V typical
Maximum Input Voltage: .......................................VDD + 0.5V
Maximum Input Frequency: ..................................... 100 MHz
Output Duty Cycle: .................................. 40/60% worst case
Output Type:........................... Rambus signaling level (RSL)
Block Diagram
Pin Configuration
PCLKM0
SYNCLKN0
Phase
Alignment
Output
Logic
REFCLK
MULT0:2
S0:2
PLL
Test
Logic
CLK0
VDDIR
1
CLK0#
REFCLK
2
VDD
3
SYNCLKN0
4
PCLKM0
5
GND
6
VDD
7
GND
8
SYNCLKN1
9
PCLKM1
10
VDD
11
VDDIPD
12
STOP#
13
PWR_DWN#
14
28
S0
27
S1
26
S2
25
GND
24
CLK0#
23
CLK0
22
VDD
21
VDD
20
CLK1
19
CLK1#
18
GND
17
MULT0
16
MULT1
15
MULT2
PCLKM1
SYNCLKN1
Phase
Alignment
Output
Logic
CLK1
CLK1#
PWR_DWN#
STOP#
Direct Rambus is a trademark and Rambus is a registered trademark of Rambus Inc.
Intel is a registered trademark of Intel Corporation.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07232 Rev. *B
Revised December 21, 2002