ICS8431-11 Datasheet, PDF (3/13 Pages) Integrated Circuit Systems – 255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8431-11
255MHZ, LOW JITTER,
LVPECL FREQUENCY SYNTHESIZER
TABLE 3A. SSC CONTROL INPUT FUNCTION TABLE
Inputs
SSC_CTL1 SSC_CTL0
0
0
0
1
TEST_I/O
Source
Internal
PLL
SSC
Disabled
Enabled
Outputs
FOUT,
nFOUT
fXTAL ÷ 32
fXTAL x M
32
TEST_I/O
fXTAL ÷ 16
÷M
Hi-Z
1
0
External Disabled Test Clk
Input
1
1
PLL
Disabled
fXTAL x M
32
Hi-Z
NOTE 1: Used for in house debug and characterization.
Operational Modes
PLL bypass; Oscillator, oscillator, M and N
dividers test mode. NOTE 1
Default SSC; Modulation Factor = ½ Percent
PLL Bypass Mode,
(1MHz≤ Test Clk ≤ 200MHz); NOTE 1
No SSC Modulation
TABLE 3B. PROGRAMMABLE VCO FREQUENCY FUNCTION TABLE (NOTE 1)
VCO Frequency
(MHz)
M Count
256
M8
128
M7
64
M6
32
M5
16
M4
8
M3
4
M2
2
M1
1
M0
190
190
0
1
0
1
1
1
1
1
0
191
191
0
1
0
1
1
1
1
1
1
192
192
0
1
1
0
0
0
0
0
0
193
193
0
1
1
0
0
0
0
0
1
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
508
508
1
1
1
1
1
1
1
0
0
509
509
1
1
1
1
1
1
1
0
1
510
510
1
1
1
1
1
1
1
1
0
NOTE 1: Assumes a 16MHz crystal.
ICS8431CM-11
www.icst.com/products/hiperclocks.html
3
REV. A JULY 11, 2001