參數(shù)資料
型號(hào): TS87C58X2-VCA
廠商: Atmel
文件頁(yè)數(shù): 42/62頁(yè)
文件大小: 0K
描述: IC MCU 8BIT 32K OTP 40MHZ 40-DIP
標(biāo)準(zhǔn)包裝: 216
系列: 87C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40/30MHz
連通性: UART/USART
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: OTP
RAM 容量: 256 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: 0°C ~ 70°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 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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