PI6C3420ATE datasheet(4/5 Pages) PERICOM

4 / 5 page

PS8848B

08/29/06

PI6C3420A

27 MHz Spread Spectrum

Clock Synthesizer

Reference circuit for graphic chipset application(1-4)

Application Information

Crystal Load Capacitors

If a crystal is used with the device, the external trim capacitors CLtrim are used to adjust the effective capacitance to match the

required crystal load capacitance. The CLtrim value can be derived from formula CLtrim = 2*CL – (Cs + Ci). Typical CLtrim = 28pF

when crystal load = 18pF, stray capacitance Cs = 3pF and XTAL pins capacitance = 5pF.

CLtrim

Xtal

Notes:

1. PI6C3420A can accept a 14.31818MHz reference clock or crystal clock.

2. Power supply pin decoupling capacitors should be placed as close as possible to VDD pin. Via's at the VDD pin should be avoided.

3. Spread select pin's (S0 and S1):

Pin 3 (27M_SSC/S0) and Pin 6 (X2/S1) provide logic state strapping function. When strapping resistor connects to VDD, S0 and S1 are

set to logic HIGH. When strapping resistor connects to Ground, S0 or S1 will set to logic LOW.

4. Refer to "Spread Spectrum Selection Table", for more details on the strapping logic.

Strapping to high

VDD

3,6

0.1µF 0.01µF

Strapping to low

VDD

3,6

0.1µF 0.01µF

Recommended Crystal Specification

Pericom recommends: SRX7316-E Crystal for optimum performance.

Parameter

Value

Units

Mode of oscillation, and cut

Fundamental AT

Frequency

14.318

MHz

Frequency tolerance

±20

PPM

Tempurature

±30

PPM

Load Cap

Equivalent series resistance

Ω

Drive to level

100

µW

Aging Stability

±5

PPM/YR

Size = Length x Width x Height

11.18(.440) x 4.65(.183) x 13.46(.530)

mm(inch)

Note: Pericom's SRX7316-E - 14.318 MHz

series resonant crystal is recommended.

06-0278

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