MPC990 データシートの表示（PDF） - Motorola => Freescale
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MPC990 Datasheet PDF : 9 Pages
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FUNCTION TABLE 2
fselFB2
fselFB1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
fselFB0
0
1
0
1
0
1
0
1
QFB
÷2
÷4
÷6
÷8
÷8
÷16
÷24
÷32
MPC990 MPC991
FUNCTION TABLE 3
Control Pin
Logic ‘0’
PLL_En
VCO_Sel
Ref_Sel
MR
SYNC_Sel
Enable PLL
fVCO
xtal or ECL/PECL
—
SYNC Outputs
Logic ‘1’
Bypass PLL
fVCO/2
Test_Clk
Reset Outputs
Match Qc Outputs
VCO_Sel (Pulldown)
PLL_En (Pulldown)
(Pulldown)
Qa0
Ref_Sel
(Pulldown)
Qa0
Test_Clk
Qa1
ECL_Clk
Qa1
ECL_Clk
MPC991
PHASE
DETECTOR
VCO
Qa2
Qa2
Ext_FB
LPF
Qa3
Ext_FB
Qa3
Qb0
(Pulldown)
MR
Qb0
Qb1
fsela0:3 (Pulldown)
Qb1
FREQUENCY
GENERATOR
Qb2
Qb2
SYNC
Qb3
Qb3
Qc0
fselFB0:2 (Pulldown)
Qc0
Qc1
Qc1
Qc2
Qc2
Qd0
SYNC_Sel (Pulldown)
Qd0
Qd1
Qd1
Xtal
Osc
QFB
MPC990
QFB
NOTE: ECL_Clk, Ext_FB have internal pulldowns, while ECL_Clk, Ext_FB have external
pullups to ensure stability under open input conditions.
Figure 2. MPC990/991 Logic Diagram
TIMING SOLUTIONS
3
BR1333 — Rev 6
MOTOROLA
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