AT89C5131A-TISIL(2004) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A-TISIL
(Rev.:2004)

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

AC Parameters

Explanation of the AC

Symbols

External Program Memory

Characteristics

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 14, Table 17 and Table 20 give the description of each AC symbols.

Table 15, Table 19 and Table 21 give for each range the AC parameter.

Table 16, Table 19 and Table 22 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

Table 14. Symbol Description

Symbol

T

TLHLL

TAVLL

TLLAX

TLLIV

TLLPL

TPLPH

TPLIV

TPXIX

TPXIZ

TAVIV

TPLAZ

Parameter

Oscillator Clock Period

ALE Pulse Width

Address Valid to ALE

Address Hold after ALE

ALE to Valid Instruction In

ALE to PSEN

PSEN Pulse Width

PSEN to Valid Instruction In

Input Instruction Hold after PSEN

Input Instruction Float after PSEN

Address to Valid Instruction In

PSEN Low to Address Float

18 AT89C5131A-L

4338A–USB–08/04

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