T89C51RD2-3CBC-L ATMEL [ATMEL Corporation], T89C51RD2-3CBC-L Datasheet - Page 75

• Manufacturer Part Number: T89C51RD2-3CBC-L
• Description: 0 to 40MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

T89C51RD2
9.5. AC Parameters
9.5.1. 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:T
T
T
T
T
T
AC characteristics of -M parts at 3 volts are similar to -L parts
(Load Capacitance for port 0, ALE and PSEN = 100 pF; Load Capacitance for all other outputs = 80 pF.)
Table 38, Table 41 and Table 44 give the description of each AC symbols.
Table 39, Table 42 and Table 45 give for each range the AC parameter.
Table 40, Table 43 and Table 46 give the frequency derating formula of the AC parameter for each speed range
description. To calculate each AC symbols. take the x value in the correponding column (-M or -L) and use this
value in the formula.
Example: T
x = 35 ns
T = 50 ns
T
75
LLPL
A
A
A
A
CCIV
= 0 to +70 C; V
= -40 C to +85 C; V
= 0 to +70 C; V
= -40 C to +85 C; V
= Time for ALE Low to PSEN Low.
= 4T - x = 165 ns
AVLL
LLIU
= Time for Address Valid to ALE Low.
Figure 27. Clock Signal Waveform for I
for -M and 20 MHz, Standard clock.
SS
SS
= 0 V; V
= 0 V; 2.7 V < V
SS
SS
= 0 V; V
= 0 V; 2.7 V < V
CC
V
CC
= 5 V
T
CC
-0.5V
0.45V
CHCL
CC
T
= 5 V
CLCH
< 3.3 V; L range.
10%; M range.
CC
= T
< 3.3 V; L range.
CHCL
10%; M range.
= 5ns.
T
CLCH
CC
0.7V
0.2V
Tests in Active and Idle Modes
CC
CC
-0.1
Rev. F - 15 February, 2001