PI6C106 데이터 시트보기 (PDF) - Pericom Semiconductor

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PI6C106

Pentium/ProTM System Clock Chip

Pericom Semiconductor 

PI6C106

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PD# Timing Diagram

The power down selection is used to put the part into a very low power state without turning off the power to the part. PD# is

an asynchronous active low input. This signal is synchronized internal by the PI6C106 prior to its control action of

powering down the clock synthesizer. Internal clocks will not be running after the device is put in power down state. When PD# is active

(low) all clocks are driven to a low state and held prior to turning off the VCOs and the Crystal oscillator. The power on latency is guaranteed

to be less than 3ms. The power down latency is less than three CPUCLK cycles. PCI_STOP# and CPU_STOP# are don’t care signals during

the power down operations.

CPUCLK

(Internal)

PCICLK

(Internal)

PD#

CPUCLK

(0:2)

PCICLK_E, PCICLK_F,

PCICLK (0:4)

REF, IOAPIC

INTERNAL

VCOs

INTERNAL

CRYSTAL OSC.

Notes:

1. All timing is referenced to the Internal CPUCLK (defined as inside the PI6C106 device).

2. PD# is an asynchronous input and metastable conditions may exist. This signal is synchronized inside the PI6C106.

3. The shaded sections on the VCO and the Crystal signals indicate an active clock is being generated.

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PS8546A 07/13/01

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