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PI6C484321FBE Datasheet(PDF) 4 Page - Pericom Semiconductor Corporation

Part # PI6C484321FBE
Description  260MHz Crystal-to-3.3V Differential LVPECL Frequency Synthesizer
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Manufacturer  PERICOM [Pericom Semiconductor Corporation]
Direct Link  http://www.pericom.com
Logo PERICOM - Pericom Semiconductor Corporation

PI6C484321FBE Datasheet(HTML) 4 Page - Pericom Semiconductor Corporation

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4
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
4
pF
RPULLUP
Input Pullup resistor
51
kΩ
RPULLDOWN
Input Pulldown resistor
51
Parallel and Serial Modes Function Table
Inputs
Conditions
MR nP_LOAD
M
N
S_LOAD S_CLOCK S_DATA
H
X
X
X
X
X
X
Reset mode, forces outputs LOW.
L
L
Data
Data
X
X
X
Data on M and N input passed directly to the M
divider. TEST output forced LOW
L
Data
Data
L
X
X
Data is latched into input registers and remains
loaded until next LOW transition or until a serial
event occurs
L
H
X
X
L
Data
Serial input mode. Shift register is loaded with data
on S-DATA on each rising edge of S_CLOCK
L
H
X
X
L
Data
Contents of the shift register are passed to the M
divider
L
H
X
X
L
Data
M divider and N output divider values are latched
L
H
X
X
L
X
X
Parallel or serial input do not affect shift registers
L
H
X
X
H
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
64
32
16
8
4
2
1
M8
M7
M6
M5
M4
M3
M2
M1
M0
625
25
0
0
0
0
1
1
0
0
1
650
26
0
0
0
0
1
1
0
1
0
675
27
0
0
0
0
1
1
0
1
1
775
31
0
0
0
0
1
1
1
1
1
Programmable Output Divider FunctionTable
Inputs
N Divider
Value
Output Frequency (MHz)
N1
N0
Min.
Max.
0
0
3
106.67
366.67
0
1
4
80
275
1
0
5
64
220
1
1
6
53.33
183.33
Notes:
Fout_min = Fvco_min / N = 320MHz / N
Fout_max = Fvco_max /N = 1100MHz / N


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