AT89C51AC3-RDTUM datasheet(124/140 Pages) ATMEL

No. de pieza	AT89C51AC3-RDTUM

Descripción Electrónicos	Enhanced 8-bit Microcontroller with 64KB Flash Memory

PDF	140 Pages

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Fabricante Electrónico	ATMEL [ATMEL Corporation]

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124

AT89C51AC3

4383D–8051–02/08

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; VSS = 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 73, Table 76 and Table 79 give the description of each AC symbols.

Table 74, Table 78 and Table 80 give for each range the AC parameter.

Table 75, Table 78 and Table 81 give the frequency derating formula of the AC parame-

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

and use this value in the formula.

Example: TLLIV and 20 MHz, Standard clock.

x = 30 ns

T = 50 ns

TCCIV = 4T - x = 170 ns

AT89C51AC3-RDTUM Datasheet(PDF) 124 Page - ATMEL Corporation