參數(shù)資料
型號: MPC9855
廠商: Motorola, Inc.
英文描述: Clock Generator for PowerQUICC and PowerPC Microprocessors
中文描述: 微處理器時鐘發(fā)生器為PowerQUICC和PowerPC
文件頁數(shù): 8/12頁
文件大?。?/td> 267K
代理商: MPC9855
Timing Solutions
8
Freescale Semiconductor
MPC9855
Figure 4. MPC9855 AC Test Reference (LVCMOS Outputs)
Table 9. AC Characteristics
(V
DD
= 3.3 V ± 5%, V
DDOA
= 3.3 V ± 5%, V
DDOB
= 3.3 V ± 5%, T
A
= –40°C to +85°C)
(1)
(2)
1. AC characteristics are design targets and pending characterization.
2. AC characteristics apply for parallel output termination of 50
to V
TT
.
3. In bypass mode, the MPC9855 divides the input reference clock.
4. The input reference frequency must match the VCO lock range divided by the total feedback divider ratio:
f
ref
= (f
VCO
÷
M)
N.
5. –3 dB point of PLL transfer characteristics.
Symbol
Characteristics
Min
Typ
Max
Unit
Condition
Input and Output Timing Specification
f
ref
Input Reference Frequency (25 MHz input)
Input Reference Frequency (33 MHz input)
XTAL Input
Input Reference Frequency in PLL Bypass Mode
(3)
25
33
25
250
MHz
MHz
MHz
MHz
PLL bypass
f
VCO
VCO Frequency Range
(4)
2000
MHz
f
MCX
Output Frequency
Bank A output
Bank B output
Bank C output
15.87
15.87
50
200
200
500
MHz
MHz
MHz
PLL locked
f
refPW
Reference Input Pulse Width
2
ns
f
refCcc
Input Frequency Accuracy
100
ppm
t
r
, t
f
Output Rise/Fall Time
80
500
ns
20% to 80%
DC
Output Duty Cycle
47.5
45
50
50
52.5
55
%
3.3 V operation
2.5 V operation
PLL Specifications
BW
PLL Closed Loop Bandwidth
(5)
1
MHz
t
LOCK
Maximum PLL Lock Time
10
ms
t
reset_ref
MR Hold Time on Power Up
10
ns
t
reset_pulse
MR Hold Time
10
ns
Skew and Jitter Specifications
t
sk(O)
Output-to-Output Skew (within a bank)
50
ps
t
sk(O)
Output-to-Output Skew (across banks A and B)
100
ps
V
DDOA
= 3.3 V
V
DDOB
= 3.3 V
t
JIT(CC)
Cycle-to-cycle jitter
150
80
ps
Bank A and B
Back C
t
JIT(PER)
Period Jitter
150
80
ps
Bank A and B
Back C
t
JIT(
)
I/O Phase Jitter
RMS (1
σ
)
15
15
ps
Bank A and B
Back C
Pulse
Generator
Z = 50
R
T
= 50
Z
O
= 50
DUT MPC9855
V
TT
Z
O
= 50
R
T
= 50
V
TT
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