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T89C51AC2-RLSI-M Datasheet(PDF) 106 Page - ATMEL Corporation

Part # T89C51AC2-RLSI-M
Description  8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
PDF  117 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51AC2-RLSI-M Datasheet(HTML) 106 Page - ATMEL Corporation

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Draft.A - March 30, 2001
Preview - Confidential
T89C51AC2
18.4. AC Parameters
18.4.1. 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
°Cto+85°C; V
SS =0V;VCC =5V ±10%;F=0to40 MHz.
TA = -40
°Cto+85°C; V
SS =0V;
VCC =5V ± 10%.
(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other outputs = 60 pF.)
Table 26, Table 29 and Table 32 give the description of each AC symbols.
Table 27, Table 30 and Table 33 give for each range the AC parameter.
Table 28, Table 31 and Table 34 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=30ns
T=50ns
TCCIV =4T-x=170 ns



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