AT89C5122D-RDRUM datasheet(191/208 Pages) ATMEL

191 / 208 page

191

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

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 = 3.0V to 5.5V ; FCK_CPU = 0 to 24 MHz.

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

outputs = 60 pF.)

Table and Table 118 give the description of each AC symbols.

Table 117 and Table 120 give for each range the AC parameter.

Table 115, Table 117 and Table 119 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: TLLIV and 20 MHz, Standard clock.

x = 30 ns

T = 50 ns

TCCIV = 4T - x = 170 ns

External Program Memory

Characteristics

Table 114.

Symbol Description

Symbol

Parameter

CPU clock period (FCK_CPU)

TLHLL

ALE pulse width

TAVLL

Address Valid to ALE

TLLAX

Address Hold After ALE

TLLIV

ALE to Valid Instruction In

TLLPL

ALE to PSEN

TPLPH

PSEN Pulse Width

TPLIV

PSEN to Valid Instruction In

TPXIX

Input Instruction Hold After PSEN

TPXIZ

Input Instruction Float After PSEN

TAVIV

Address to Valid Instruction In

TPLAZ

PSEN Low to Address Float

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