参数资料
型号: AT89C51ED2-SMSUM
厂商: Atmel
文件页数: 21/137页
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 68PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 304
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 50
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 68-PLCC
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
117
4235K–8051–05/08
AT89C51RD2/ED2
Figure 25-4. Clock Signal Waveform for ICC Tests in Active and Idle Modes
25.3
AC Parameters
25.3.1
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:TAVLL = Time for Address Valid to ALE Low.
TLLPL = 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 25-1 Table 25-4, and Table 25-7 give the description of each AC symbols.
Table 25-2, Table 25-3, Table 25-5 and Table 25-8 gives the range for each AC parameter.
Table 25-2, Table 25-3 and Table 25-9 give the frequency derating formula of the AC parameter
for each speed range description. To calculate each AC symbols. take the x value in the corre-
ponding column (-M) and use this value in the formula.
Example: TLLIU for -M and 20 MHz, Standard clock.
x = 35 ns
T 50 ns
TCCIV = 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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