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PI6C102-16BH

Spread Spectrum Clock Synthesizer for Mobile Pentium II

Pericom Semiconductor 

PI6C102-16

Spread Spectrum Clock Synthesizer

for Mobile Pentium II 1122334455667788990011223344556677889900112233445566778899001122112233445566778899001122334455667788990011223344556677889900112211223344556677889900112233445566778899001122334455667788990011221122334455667788990011223344556677889900112233445566778899001122112233445566778899001122

Minimum and Maximum Expected Capacitive Loads

Clock

Min. Load Max. Load Units

Notes

CPU Clocks (HCLK)

10

20

1 device load, possible 2 loads

PCI Clocks (PCLK)

30

30

pF Meets PCI 2.1 requirements

REF, 48MHz

10

20

1 device load

Notes:

1. Maximum rise/fall times are guaranteed at maximum specified load for each type of output buffer.

2. Minimum rise/fall times are guaranteed at minimum specified load for each type of output buffer.

3. Rise/fall times are specified with pure capacitive load as shown. Testing is done with an

additional 500Ω resistor in parallel.

Design Guidelines to Reduce EMI

1. Place series resistors and CI capacitors as close as possible to the respective clock pins. Typical value

for CI is 10pF. Series resistor value can be increased to reduce EMI provided that the rise and fall time

are still within the specified values.

2. Minimize the number of “vias” of the clock traces.

3. Route clock traces over a continuous ground plane or over a continuous power plane. Avoid routing

clock traces from plane to plane (refer to rule #2).

4. Position clock signals away from signals that go to any cables or any external connectors.

PI6C102-16

2

CPUCLK

32Ω

6

33Ω

PCICLK

REF

22Ω/33Ω

CL

CL

CL

1 Device load

Meets PCI2.1 Req.

1 Device load

10

P8399-1 06/11/99

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