参数资料
型号: AT80C51RD2-3CSUM
厂商: Atmel
文件页数: 63/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 40-DIP
标准包装: 216
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 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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