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参数资料
| 型号： | MPC990FA |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP52 |
| 封装： | PLASTIC, TQFP-52 |
| 文件页数： | 3/7页 |
| 文件大小： | 106K |
| 代理商： | MPC990FA |
MPC990
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
253
FUNCTION TABLE 2
fselFB2
fselFB1
fselFB0
QFB
0
1
0
1
0
1
÷2
÷4
÷6
÷8
1
0
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
Test_Clk
MR
—
Reset Outputs
SYNC_Sel
SYNC Outputs
Match Qc Outputs
xtal
Osc
Figure 2. MPC990 Logic Diagram
VCO
PHASE
DETECTOR
LPF
PLL_En
VCO_Sel
xtal1
xtal2
Test_Clk
Ref_Sel
Ext_FB
Qa0
Qa1
Qa2
Qa3
Qb0
Qb1
Qb2
Qb3
Qc0
Qc1
Qc2
Qd0
Qd1
QFB
FREQUENCY
GENERATOR
SYNC
MR
fsela0:3
fselFB0:2
SYNC_Sel
(Pulldown)
NOTE: Ext_FB has internal pulldowns, while Ext_FB has external pullups to ensure
stability under open input conditions.
2
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