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W320-04H Datasheet(PDF) 12 Page - Cypress Semiconductor

Part No. W320-04H
Description  200-MHz Spread Spectrum Clock Synthesizer/Driver with Differential CPU Outputs
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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W320-04H Datasheet(HTML) 12 Page - Cypress Semiconductor

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W320-04
Document #: 38-07010 Rev. *B
Page 12 of 18
PWRGD# Timing Diagrams
PWRDWN# Deassertion
10-30
µs min.
100-200
µs max.
< 3 ms
66BUFF1/GMCH
66BUFF0,2
PCI
PWR_DWN#
CPU
CPU#
3V66
66IN
USB
REF
PCI_F (APIC)
Note: PCI_STOP# asserted LOW
GND VRM 5/12V
PWRGD#
VID [3:0]
BSEL [1:0]
PWRGD# FROM
VRM
PWRGD# FROM
NPN
Possible glitch while Clock VCC is coming
up. Will be gone in 0.2–0.3 mS delay.
VCC CPU CORE
PWRGD#
VCC W320 CLOCK
0.2 -- 0.3 ms
delay
Wait for
PWRGD#
Sample
BSELS
CLOCK STATE
State 0
State 1
State 2
S tate 3
ON
OFF
OFF
CLOCK VCO
CLOCK OUTPUTS
Figure 2. CPU Power Before Clock Power
ON
GEN


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