ICS87974I Datasheet, PDF (5/16 Pages) Integrated Device Technology – Fully integrated PLL

ICS87974I
LOW SKEW, 1-TO-15,
LVCMOS/LVTTL CLOCK GENERATOR
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter
Test Conditions
C_IN
R_PULLUP
R_PULLDOWN
C_PD
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Power Dissipation Capacitance
(per output); Note 1
V_DD, V_DDA, V_DDOx = 3.465V
R_OUT
Output Impedance
NOTE 1: V_DDOx denotes V_DDOA, V_DDOB, V_DDOC, V_DDOFB.
Minimum
Typical
4
51
51
Maximum
Units
pF
KΩ
KΩ
15
pF
5
7
12
Ω
TABLE 3A. OUTPUT CONTROL PIN FUNCTION TABLE
Inputs
nMR/OE
CLK_EN
0
X
1
0
1
1
QA0:QA4
HiZ
LOW
Enable
Outputs
QB0:QB4
QC0:QC3
HiZ
HiZ
LOW
LOW
Enable
Enable
QFB
HiZ
Enable
Enable
TABLE 3B. OPERATING MODE FUNCTION TABLE
Inputs
PLL_SEL
0
1
Operating Mode
Bypass
PLL
TABLE 3C. PLL INPUT FUNCTION TABLE
Inputs
CLK_SEL
PLL Input
0
CLK0
1
CLK1
TABLE 3D. SELECT PIN FUNCTION TABLE
SEL_A
0
1
QAx
÷2
÷4
SEL_B
0
1
QBx
÷2
÷4
SEL_C
0
1
QCx
÷4
÷6
TABLE 3E. FB SELECT FUNCTION TABLE
Inputs
FB_SEL1
FB_SEL0
0
0
1
0
0
1
1
1
Outputs
QFB
÷4
÷6
÷8
÷ 12
TABLE 3F. VCO SELECT FUNCTION TABLE
Inputs
VCO_SEL
fVCO
0
VCO/2
1
VCO/4
87974CYI
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5
REV. E JULY 26, 2010