AT89C51CC03U-RDTIM datasheet(163/183 Pages) ATMEL

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Giải thích chi tiết về linh kiện	Enhanced 8-bit MCU with CAN Controller and Flash Memory

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163

AT89C51CC03

4182B–CAN–09/03

AC Parameters

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 status 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 = -40

°C to +85°C; V

SS = 0V; VCC = 3V to 5.5V; F = 0 to 40 MHz.

(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other

outputs = 60 pF.)

Table 117, Table 120 and Table 123 give the description of each AC symbols.

Table 118, Table 122 and Table 124 give for each range the AC parameter.

Table 119, Table 122 and Table 125 give the frequency derating formula of the AC

parameter for each speed range description. To calculate each AC symbols: Take the x

value and use this value in the formula.

Example: T

LLIV and 20 MHz, Standard clock.

x = 30 ns

T = 50 ns

CCIV = 4T - x = 170 ns

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