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參數(shù)資料
| 型號(hào)： | SAK-C164CH-8FM |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.65 MM PITCH, METRIC, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 47/74頁 |
| 文件大?。?/td> | 917K |
| 代理商： | SAK-C164CH-8FM |
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&
Data Sheet
49
1999-08
The timings listed in the AC Characteristics that refer to TCLs therefore must be
calculated using the minimum TCL that is possible under the respective circumstances.
The actual minimum value for TCL depends on the jitter of the PLL. As the PLL is
constantly adjusting its output frequency so it corresponds to the applied input frequency
(crystal or oscillator) the relative deviation for periods of more than one TCL is lower than
for one single TCL (see formula and figure below).
For a period of
N * TCL the minimum value is computed using the corresponding
deviation D
N:
(
N * TCL)
min = N * TCLNOM - D
N
D
N [ns] = ±(13.3 + N*6.3) / ICPU [MHz],
where
N = number of consecutive TCLs
and 1
≤ N ≤ 40.
So for a period of 3 TCLs @ 25 MHz (i.e.
N = 3): D
3 = (13.3 + 3 * 6.3) / 25 = 1.288 ns,
and (3TCL)
min = 3TCLNOM - 1.288 ns = 58.7 ns (@ ICPU = 25 MHz).
This is especially important for bus cycles using waitstates and e.g. for the operation of
timers, serial interfaces, etc. For all slower operations and longer periods (e.g. pulse train
generation or measurement, lower baudrates, etc.) the deviation caused by the PLL jitter
is neglectible.
Note: For all periods longer than 40 TCL the N=40 value can be used (see figure below).
Figure 11
Approximated Maximum Accumulated PLL Jitter
40
20
10
5
1
±1
±10
±20
N
This approximated formula is valid for
1
≤ 1 ≤ 40 and 10MHz ≤ f
CPU ≤ 25MHz.
±26.5
Max.jitter D1 [ns]
20 MHz
25 MHz
16 MHz
10 MHz
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| SAK-C164CI-825MDB | 制造商:Infineon Technologies AG 功能描述: |
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| SAK-C164CI-8E25M DB | 功能描述:16位微控制器 - MCU 16-Bit Sngl-Chip 5V 25MHz OTP RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| SAKC164CI8E25M DB TR | 制造商:Infineon Technologies AG 功能描述: |
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