AT89C5131-RDTIL datasheet(157/176 Pages) ATMEL

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157

AT89C5131

4136B–USB–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; VSS = 0V; VCC = 3.3V ±10%; F = 0 to 40 MHz.

TA = -40°C to +85°C; VSS = 0V; VCC = 3.3V ± 10%.

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

outputs = 60 pF.)

Table 112, Table 115 and Table 118 give the description of each AC symbols.

Table 113, Table 117 and Table 119 give for each range the AC parameter.

Table 114, Table 117 and Table 120 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

External Program Memory

Characteristics

Table 112. Symbol Description

Symbol

Parameter

Oscillator Clock Period

LHLL

ALE Pulse Width

AVLL

Address Valid to ALE

LLAX

Address Hold after ALE

LLIV

ALE to Valid Instruction In

LLPL

ALE to PSEN

PLPH

PSEN Pulse Width

PLIV

PSEN to Valid Instruction In

PXIX

Input Instruction Hold after PSEN

PXIZ

Input Instruction Float after PSEN

AVIV

Address to Valid Instruction In

PLAZ

PSEN Low to Address Float

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