参数资料
型号: AT87C54X2-3CSUM
厂商: Atmel
文件页数: 42/62页
文件大小: 0K
描述: IC 8051 MCU 16K EPROM 40DIP
标准包装: 216
系列: 87C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40/20MHz
连通性: UART/USART
外围设备: POR,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 256 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
47
4431E–8051–04/06
AT/TS8xC54/8X2
19.5
AC Parameters
19.5.1
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.
TA = 0 to +70
°C (commercial temperature range); V
SS = 0 V; VCC = 5 V ± 10%; -M and -V ranges.
TA = -40
°C to +85°C (industrial temperature range); V
SS = 0 V;
V
CC = 5 V ± 10%; -M and -V
ranges.
TA = 0 to +70
°C (commercial temperature range); V
SS = 0 V; 2.7 V < VCC < 5.5 V; -L range.
TA = -40
°C to +85°C (industrial temperature range); V
SS = 0 V; 2.7 V < VCC < 5.5 V; -L range.
Table 19-3. gives the maximum applicable load capacitance for Port 0, Port 1, 2 and 3, and ALE
and PSEN signals. Timings will be guaranteed if these capacitances are respected. Higher
capacitance values can be used, but timings will then be degraded.
Table 19-3.
Load Capacitance versus speed range, in pF
Table 19-5., Table 19-8. and Table 19-11. give the description of each AC symbols.
Table 19-6., Table 19-9. and Table 19-12. give for each range the AC parameter.
Table 19-7., Table 19-10. and Table 19-13. give the frequency derating formula of the AC
parameter. To calculate each AC symbols, take the x value corresponding to the speed grade
you need (-M, -V or -L) and replace this value in the formula. Values of the frequency must be
limited to the corresponding speed grade:
Table 19-4.
Max frequency for derating formula regarding the speed grade
Example:
TLLIV in X2 mode for a -V part at 20 MHz (T = 1/20
E6 = 50 ns):
T= 50ns
T
LLIV= 2T - x = 2 x 50 - 22 = 78ns
-M
-V
-L
Port 0
100
50
100
Port 1, 2, 3
80
50
80
ALE / PSEN
100
30
100
-M X1 mode
-M X2 mode
-V X1 mode
-V X2 mode
-L X1 mode
-L X2 mode
Freq (MHz)
40
20
40
30
20
T (ns)
25
50
25
33.3
50
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