PI6C484321 datasheet(4/9 Pages) PERICOM

4 / 9 page

PS8765A

08/01/05

PI6C484321

260MHz Crystal-to-3.3V Differential

LVPECL Frequency Synthesizer

Pin Characteristics

Symbol

Parameter

Min.

Typ.

Max.

Units

CIN

Input capacitance

RPULLUP

Input Pullup resistor

kΩ

RPULLDOWN

Input Pulldown resistor

Parallel and Serial Modes Function Table

Inputs

Conditions

MR nP_LOAD

S_LOAD S_CLOCK S_DATA

Reset mode, forces outputs LOW.

Data

Data on M and N input passed directly to the M

divider. TEST output forced LOW

↑

Data

Data is latched into input registers and remains

loaded until next LOW transition or until a serial

event occurs

↑

Data

Serial input mode. Shift register is loaded with data

on S-DATA on each rising edge of S_CLOCK

↑

Data

Contents of the shift register are passed to the M

divider

↓

Data

M divider and N output divider values are latched

Parallel or serial input do not affect shift registers

↑

Data

S_Data passed directly to M divider as it is clocked

Notes: L = Low, H = High, X = Don't care,

↑ = Rising Edge, and ↓ = Falling edge Transition

Programmable VCO Frequency Example Based On 25MHz input

VCO Freq.

M Divider

256

128

625

650

675

775

Programmable Output Divider FunctionTable

Inputs

N Divider

Value

Output Frequency (MHz)

Min.

Max.

106.67

366.67

275

220

53.33

183.33

Notes:

Fout_min = Fvco_min / N = 320MHz / N

Fout_max = Fvco_max /N = 1100MHz / N

PI6C484321 Datasheet(PDF) 4 Page - Pericom Semiconductor Corporation

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