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Advance Information
FS8308
Page 3
April 2003
Pin Descriptions
Block Diagram
Number
Name
I/O
Description
1XIN
I
Reference crystal oscillator or external clock input with internally biased amplifier
(any external input to XIN must be ac-coupled)
2
XOUT
O
Reference crystal oscillator or external clock output
3
VDD2
POWER
Nominal 3.0 V supply voltage
4
NC
NC
No connection
5
DO
O
Single-ended charge pump output for passive low-pass filter
6
VSS
GND
Ground
7FIN
I
VCO frequency input with internally biased input amplifier
(any external input to FIN must be ac-coupled)
8
VDD1
POWER
Nominal 1.0 V supply voltage
9
NC
NC
No connection
10
LD
O
Lock detector output (high when PLL is locked)
11
CLK
I
Shift register clock input
12
DATA
I
Serial data input
13
LE
I
Latch enable input
14
SW
O
Switchover terminal for constant of loop filter or a general open drain output
15
TEST
I
Test mode control input with internal pull-down resistor
16
BO
O
Terminal of reference crystal oscillator buffer output
PFD
CHARGE
PUMP
FIN
DATA
CLK
LE
TEST
XIN
CONTROL
LOGIC
N-COUNTER
R-COUNTER
SHIFT REGISTER
N-LATCH
R-LATCH
÷ 8
÷ 64/65
LD
DO
XOUT
LOCK
DETECTOR
WINDOW
GENERATOR
S-LATCH
SW
BO
SW
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