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