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MPC990 Datasheet(PDF) 3 Page - Motorola, Inc

Part No. MPC990
Description  LOW VOLTAGE PLL CLOCK DRIVER
Download  9 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MPC990 Datasheet(HTML) 3 Page - Motorola, Inc

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


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