2 / 13 page
FS8160
Page 2
April 2003
Pin Descriptions
Functional Block Diagram
Number
Name
I/O
Description
1
FOLD
O
Multiplexed CMOS level output (see Programming Description section)
2
XIN
I
Reference crystal oscillator or external clock input with internally biased amplifier
3
XOUT
O
Reference crystal oscillator output used with external resonator
4
VSSA
—
Ground (aux PLL)
5
FINA
I
VCO frequency input with internally biased input amplifier (aux PLL)
6
VDDA
—
Nominal 3.0 V supply voltage (aux PLL)
7
DOA
O
Single-ended charge pump output (aux PLL)
8
ENA
I
Enable control input; normal operation when high, power-down mode when low (aux PLL)
9
ENM
I
Enable control input; normal operation when high, power-down mode when low (main PLL)
10
DOM
O
Single-ended charge pump output (main PLL)
11
VDDM
—
Nominal 3.0 V supply voltage (main PLL)
12
FINM
I
VCO frequency input with internally biased input amplifier (main PLL)
13
VSSM
—
Ground (main PLL)
14
LE
I
Latch enable input
15
DATA
I
Serial data input
16
CLK
I
Shift register clock input
PFD
FOLD
FINM
DATA
CLK
LE
ENM
CONTROL
LOGIC
R-COUNTER
SHIFT REGISTER
AUX LATCH
FOLD
DOM
FINA
LOCK
DETECTOR
ENA
N-COUNTER
MAIN LATCH
N-COUNTER
R-COUNTER
PFD
CHARGE
PUMP
LOCK
DETECTOR
OSC
CHARGE
PUMP
MAIN
PRESCALER
AUX
PRESCALER
XOUT
XIN
DOA
MUX
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