ICS87931I Datasheet, PDF (3/14 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER

Integrated
Circuit
Systems, Inc.
ICS87931I
LOW SKEW, 1-TO-6
LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER
TABLE 3A. CONTROL INPUT FUNCTION TABLE
Inputs
Function
Control Pin
Logic 0
Logic 1
CLK_SEL
CLK0, nCLK0
CLK1
PLL_SEL
Bypass PLL
PLL Enabled
EXTFB_SEL
Internal Feedback
EXT_FB
POWER_DN
VCO/1
VCO/2
nMR
Master Reset/Output Hi Z
Enable Outputs
DIV_SELA:DIV_SELC QA(÷2); QB(÷2); QC(÷4) QA(÷4); QB(÷4); QC(÷6)
TABLE 3B. CLK_ENX FUNCTION TABLE
Inputs
CLK_EN1
0
0
1
1
CLK_EN0
0
1
0
1
QAx
Toggle
LOW
Toggle
Toggle
DIV_SELA:DIVSELC
QBx
LOW
LOW
LOW
Toggle
QCx
LOW
Toggle
Toggle
Toggle
TABLE 4A. VCO FREQUENCY FUNCTION TABLE
Inputs
Outputs
DIV_ DIV_ DIV_
QAx
QBx
QCx
SELA SELB SELC _{POWER_DN = 0 POWER_DN = 1 POWER_DN = 0 POWER_DN = 1 POWER_DN = 0 POWER_DN = 1}
0
0
0
VCO/2
VCO/4
VCO/2
VCO/4
VCO/4
VCO/8
0
0
1
VCO/2
VCO/4
VCO/2
VCO/4
VCO/6
VCO/12
0
1
0
VCO/2
VCO/4
VCO/4
VCO/8
VCO/4
VCO/8
0
1
1
VCO/2
VCO/4
VCO/4
VCO/8
VCO/6
VCO/12
1
0
0
VCO/4
VCO/8
VCO/2
VCO/4
VCO/4
VCO/8
1
0
1
VCO/4
VCO/8
VCO/2
VCO/4
VCO/6
VCO/12
1
1
0
VCO/4
VCO/8
VCO/4
VCO/8
VCO/4
VCO/8
1
1
1
VCO/4
VCO/8
VCO/4
VCO/8
VCO/6
VCO/12
TABLE 4B. INPUT REFERENCE FREQUENCY TO OUTPUT FREQUENCY FUNCTION TABLE (INTERNAL FEEDBACK ONLY)
Inputs
Outputs
DIV_ DIV_ DIV_
QAx
QBx
QCx
SELA SELB SELC _{POWER_DN = 0 POWER_DN = 1 POWER_DN = 0 POWER_DN = 1 POWER_DN = 0 POWER_DN = 1}
0
0
0
4x
2x
4x
2x
2x
x
0
0
1
4x
2x
4x
2x
4/3x
2/3x
0
1
0
4x
2x
2x
x
2x
x
0
1
1
4x
2x
2x
x
4/3x
2/3x
1
0
0
2x
x
4x
2x
2x
x
1
0
1
2x
x
4x
2x
4/3x
2/3x
1
1
0
2x
x
2x
x
2x
x
1
1
1
2x
x
2x
x
4/3x
2/3x
87931BYI
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3
REV. A JUNE 23, 2003