ICS844003I Datasheet, PDF (4/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844003I
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER
TABLE 3C. OUTPUT BANK CONFIGURATION SELECT FUNCTION TABLE
Inputs
DIV_SELA1 DIV_SELA0
0
0
Outputs
QA
÷1
Inputs
DIV_SELB1 DIV_SELB0
0
0
0
1
÷2
0
1
1
0
÷4
1
1
÷5
1
0
1
1
Outputs
QB
÷1
÷2
÷4
÷5
TABLE 3D. FEEDBACK DIVIDER CONFIGURATION SELECT FUNCTION TABLE
FB_DIV
0
1
Inputs
Feedback Divide
÷20
÷24
TEST_CLK
CLK_ENx
nQA0,
nQB0:nQB1
QA0,
QB0:QB1
Disabled
Enabled
FIGURE 1. CLK_EN TIMING DIAGRAM
TABLE 3E. CLK_ENA SELECT FUNCTION TABLE
Inputs
CLK_ENA
0
1
Outputs
QA0
nQA0
LOW
HIGH
Active
Active
TABLE 3F. CLK_ENB SELECT FUNCTION TABLE
Inputs
CLK_ENB
0
1
Outputs
QB0:QB1
nQB0:nQB1
LOW
HIGH
Active
Active
844003AGI
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4
REV. B AUGUST 25, 2005