CC Tests in Active and Idle Modes
參數(shù)資料
型號(hào): AT80C51RD2-SLSUM
廠商: Atmel
文件頁(yè)數(shù): 63/81頁(yè)
文件大?。?/td> 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
標(biāo)準(zhǔn)包裝: 972
系列: 80C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器類型: ROMless
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-PLCC
包裝: 管件
63
4113D–8051–01/09
AT80C51RD2
Figure 17-4. Clock Signal Waveform for I
CC Tests in Active and Idle Modes
17.3
AC Parameters
17.3.1
Explanation of the AC Symbols
Each timing symbol has 5 characters. The first character is always a “t” (stands for time). The
other characters, depending on their positions, stand for the name of a signal or the logical sta-
tus of that signal. The following is a list of all the characters and what they stand for.
Example:T
AVLL = Time for Address Valid to ALE Low.
T
LLPL = Time for ALE Low to PSEN Low.
(Load Capacitance for port 0, ALE and PSEN = 100 pF; Load Capacitance for all other outputs =
80 pF.)
Table 17-2 Table 17-5, and Table 17-7 give the description of each AC symbols.
Table 17-4, Table 17-6 and Table 17-8 give for each range the AC parameter.
Table 17-3, Table 17-4 and Table 17-9 gives the frequency derating formula of the AC parame-
ter for each speed range description. To calculate each AC symbols. take the x value in the
correponding column and use this value in the formula.
Example: T
LLIU for 20 MHz, Standard clock.
x = 35 ns
T = 50 ns
T
CCIV = 4T - x = 165 ns
V
CC-0.5V
0.45V
0.7V
CC
0.2V
CC-0.1
T
CLCH
T
CHCL
T
CLCH = TCHCL = 5ns.
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