Integrated
Circuit
Systems, Inc.
ICS84320-01
780MH
Z
, C
RYSTAL
-
TO
-3.3V D
IFFERENTIAL
LVPECL F
REQUENCY
S
YNTHESIZER
T
ABLE
3A. P
ARALLEL
AND
S
ERIAL
M
ODE
F
UNCTION
T
ABLE
Inputs
Conditions
S_CLOCK
X
X
X
↑
L
L
X
↑
S_DATA
X
X
X
Data
Data
Data
X
Data
Reset. Forces outputs LOW.
Data on M and N inputs passed directly to the M
divider and N output divider. TEST output forced LOW.
Data is latched into input registers and remains loaded
until next LOW transition or until a serial event occurs.
Serial input mode. Shift register is loaded with data on
S_DATA on each rising edge of S_CLOCK.
Contents of the shift register are passed to the
M divider and N output divider.
M divider and N output divider values are latched.
Parallel or serial input do not affect shift registers.
S_DATA passed directly to M divider as it is clocked.
X
X
L
L
↑
↓
L
H
MR
H
L
L
L
L
L
L
L
nP_LOAD
X
L
↑
H
H
H
H
H
M
X
Data
Data
X
X
X
X
X
N
X
Data
Data
X
X
X
X
X
S_LOAD
NOTE: L = LOW
H = HIGH
X = Don't care
↑
= Rising edge transition
↓
= Falling edge transition
T
ABLE
3B. P
ROGRAMMABLE
VCO F
REQUENCY
F
UNCTION
T
ABLE
VCO Frequency
(MHz)
625
•
700
•
M Divide
25
•
28
•
256
M8
0
•
0
•
128
M7
0
•
0
•
64
M6
0
•
0
•
32
M5
0
•
0
•
16
M4
1
•
1
•
8
M3
1
•
1
•
4
M2
0
•
1
•
2
M1
0
•
0
•
1
M0
1
•
0
•
1
775
31
0
0
0
0
1
1
1
1
NOTE 1: These M divide values and the resulting frequencies correspond to crystal or TEST_CLK input frequency
of 25MHz.
T
ABLE
3C. P
ROGRAMMABLE
O
UTPUT
D
IVIDER
F
UNCTION
T
ABLE
Inputs
N1
0
0
1
1
N0
0
1
0
1
N Divider Value
1
2
4
8
Output Frequency (MHz)
Minimum
620
310
155
77.5
Maximum
780
390
195
97.5
84320AY-01
www.icst.com/products/hiperclocks.html
4
REV. A AUGUST 24, 2004
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
