參數(shù)資料
型號： MPC8543EPXANGB
廠商： Freescale Semiconductor
文件頁數(shù)： 60/151頁
文件大小： 0K
描述： MPU POWERQUICC III 783-PBGA
標(biāo)準(zhǔn)包裝： 1
系列： MPC85xx
處理器類型： 32-位 MPC85xx PowerQUICC III
速度： 800MHz
電壓： 1.1V
安裝類型： 表面貼裝
封裝/外殼： 783-BBGA，F(xiàn)CBGA
供應(yīng)商設(shè)備封裝： 783-FCPBGA（29x29）
包裝： 托盤
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9
16
Freescale Semiconductor
Input Clocks
4
Input Clocks
This section discusses the timing for the input clocks.
4.1
System Clock Timing
The following table provides the system clock (SYSCLK) AC timing specifications for the device.
4.2
Real Time Clock Timing
The RTC input is sampled by the platform clock (CCB clock). The output of the sampling latch is then
used as an input to the counters of the PIC and the TimeBase unit of the e500. There is no jitter
specification. The minimum pulse width of the RTC signal must be greater than 2x the period of the CCB
clock. That is, minimum clock high time is 2
t
CCB, and minimum clock low time is 2 tCCB. There is
no minimum RTC frequency; RTC may be grounded if not needed.
Table 5. SYSCLK AC Timing Specifications
At recommended operating conditions (see Table 2) with OVDD = 3.3 V ± 165 mV.
Parameter/Condition
Symbol
Min
Typ
Max
Unit
Notes
SYSCLK frequency
fSYSCLK
16
—
133
MHz
SYSCLK cycle time
tSYSCLK
7.5
—
60
ns
6, 7, 8
SYSCLK rise and fall time
tKH, tKL
0.6
1.0
1.2
ns
SYSCLK duty cycle
tKHK/tSYSCLK
40
—
60
%
SYSCLK jitter
—
±150
ps
Notes:
1. Caution: The CCB clock to SYSCLK ratio and e500 core to CCB clock ratio settings must be chosen such that the resulting
SYSCLK frequency, e500 (core) frequency, and CCB clock frequency do not exceed their respective maximum or minimum
settings.
2. Rise and fall times for SYSCLK are measured at 0.6 and 2.7 V.
3. Timing is guaranteed by design and characterization.
4. This represents the total input jitter—short term and long term—and is guaranteed by design.
5. The SYSCLK driver’s closed loop jitter bandwidth must be <500 kHz at –20 dB. The bandwidth must be set low to allow
cascade-connected PLL-based devices to track SYSCLK drivers with the specified jitter.
6. This parameter has been adjusted slower according to the workaround for device erratum GEN 13.
7. For spread spectrum clocking. Guidelines are + 0% to –1% down spread at modulation rate between 20 and 60 kHz on
SYSCLK.
8. System with operating core frequency less than 1200 MHz must limit SYSCLK frequency to 100 MHz maximum.
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