ICS8752 Datasheet, PDF (3/15 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER

Integrated
Circuit
Systems, Inc.
ICS8752
LOW SKEW, 1-TO-8
LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER
TABLE 3. CONTROL INPUT FUNCTION TABLE
Inputs
Outputs
MR/nOE PLL_SEL CLK_SEL
1
X
X
DIV_
SELA1
X
DIV_
SELA0
X
DIV_
SELB1
X
DIV_
SELB0
X
QAx
Hi-Z
QBx
Hi-Z
0
1
X
0
0
0
0
fVCO/2
fVCO/4
0
1
X
0
1
0
1
fVCO/4
fVCO/6
0
1
X
1
0
1
0
fVCO/6
fVCO/8
0
1
X
1
1
1
1
fVCO/8
fVCO/12
0
0
0
0
0
0
0
fCLK0/2
fCLK0/4
0
0
0
0
1
0
1
fCLK0/4
fCLK0/6
0
0
0
1
0
1
0
fCLK0/6
fCLK0/8
0
0
0
1
1
1
1
fCLK0/8
fCLK0/12
0
0
1
0
0
0
0
fCLK1/2
fCLK1/4
0
0
1
0
1
0
1
fCLK1/4
fCLK1/6
0
0
1
1
0
1
0
fCLK1/6
fCLK1/8
0
0
1
1
1
1
1
fCLK1/8
fCLK1/12
NOTE: For normal operation, MR/nOE is LOW. When MR/nOE is HIGH, all ouputs are disabled.
TABLE 4A. QA OUTPUT FREQUENCY W/FB_IN = QB
Inputs
FB_IN
DIV_ DIV_
SELB1 SELB0
QB Output
Divider Mode
(NOTE 2)
CLK0, CLK1 (MHz)
(NOTE 1)
Minimum Maximum
DIV_
SELA1
0
QB
0
0
÷4
0
55
120
1
1
0
QB
0
1
0
÷6
36.66
80
1
1
0
0
QB
1
0
÷8
27.5
60
1
1
0
QB
1
1
0
÷12
18.33
40
1
1
NOTE 1: VCO frequency range is 220MHz to 480MHz.
NOTE 2: QA output frequency equal to CLKx frequency times the multiplier;
QB output frequency equal to CLKx.
DIV_
SELA0
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
QA Output
Divider Mode
÷2
÷4
÷6
÷8
÷2
÷4
÷6
÷8
÷2
÷4
÷6
÷8
÷2
÷4
÷6
÷8
Outputs
QA Multiplier
(NOTE 2)
2
1
0.667
0.5
3
1.5
1
0.75
4
2
1.33
1
6
3
2
1.5
8752CY
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3
REV. A AUGUST 19, 2002