ICS84321I Datasheet, PDF (4/16 Pages) Integrated Circuit Systems – 260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS84321I
260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
TABLE 3A. PARALLEL AND SERIAL MODE FUNCTION TABLE
MR nP_LOAD M
H
X
X
Inputs
N S_LOAD
X
X
S_CLOCK
X
S_DATA
X
Conditions
Reset. Forces outputs LOW.
L
L
Data Data
X
L
↑
Data Data
L
L
H
XX
L
L
H
XX
↑
X
X
Data on M and N inputs passed directly to the M
divider and N output divider. TEST output forced LOW.
X
X
Data is latched into input registers and remains loaded
until next LOW transition or until a serial event occurs.
↑
Data
Serial input mode. Shift register is loaded with data on
S_DATA on each rising edge of S_CLOCK.
L
Data
Contents of the shift register are passed to the
M divider and N output divider.
L
H
XX
↓
L
Data M divider and N output divider values are latched.
L
H
XX
L
X
X Parallel or serial input do not affect shift registers.
L
H
XX
H
NOTE: L = LOW
H = HIGH
X = Don't care
↑ = Rising edge transition
↓ = Falling edge transition
↑
Data S_DATA passed directly to M divider as it is clocked.
TABLE 3B. PROGRAMMABLE VCO FREQUENCY FUNCTION TABLE (NOTE 1)
VCO Frequency
(MHz)
M Divide
256
M8
128
M7
64
M6
32
M5
16
M4
8
M3
4
M2
2
M1
1
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
NOTE 1: These M divide values and the resulting frequencies correspond to crystal or TEST_CLK input frequency
of 25MHz.
TABLE 3C. PROGRAMMABLE OUTPUT DIVIDER FUNCTION TABLE TABLE 3D. COMMONLY USED CONFIGURATION FUNCTION TABLE
Inputs
N1 N0
00
01
10
11
N Divider
Value
3
4
5
6
Output Frequency (MHz)
Minimum Maximum
206.7
260
155
195
124
156
103.3
130
Crystal
(MHz)
19.44
19.53125
25
25
25.50
25.50
25.50
38.88
Input
M Divider
Value
32
32
25
25
25
25
25
16
N Divider
Value
4
4
4
5
3
4
6
4
Output Frequency
(MHz)
155.52
156.25
156.25
125
212.50
159.375
106.25
155.52
84321AYI
www.icst.com/products/hiperclocks.html
4
REV. A OCTOBER 10, 2003