TS80C32X2 ATMEL Corporation, TS80C32X2 Datasheet - Page 31

• Manufacturer Part Number: TS80C32X2
• Description: 8-bit Microcontroller ROMless
• Manufacturer: ATMEL Corporation

7.5 AC Parameters
7.5.1 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
Table 16. gives the maximum applicable load capacitance for Port 0, Port 1, 2 and 3, and ALE and PSEN signals.
Timings will be guaranteed if these capacitances are respected. Higher capacitance values can be used, but timings
will then be degraded.
Table 18., Table 21. and Table 24. give the description of each AC symbols.
Table 19., Table 22. and Table 25. give for each range the AC parameter.
Table 20., Table 23. and Table 26. give the frequency derating formula of the AC parameter. To calculate each
AC symbols, take the x value corresponding to the speed grade you need (-M, -V or -L) and replace this value
in the formula. Values of the frequency must be limited to the corresponding speed grade:
Example:
T
Rev. C - 15 January, 2001
LLPL
A
A
A
A
LLIV
ALE / PSEN
Freq (MHz)
Port 1, 2, 3
= 0 to +70 C (commercial temperature range); V
= -40 C to +85 C (industrial temperature range); V
= 0 to +70 C (commercial temperature range); V
= -40 C to +85 C (industrial temperature range); V
T (ns)
Port 0
in X2 mode for a -V part at 20 MHz (T = 1/20
= Time for ALE Low to PSEN Low.
x= 25 (Table 20.)
T= 50ns
T
AVLL
LLIV
= 2T - x = 2 x 50 - 25 = 75ns
= Time for Address Valid to ALE Low.
Table 17. Max frequency for derating formula regarding the speed grade
-M X1 mode
40
25
Table 16. Load Capacitance versus speed range, in pF
100
100
-M
80
-M X2 mode
20
50
-V X1 mode
SS
SS
E6
SS
SS
40
25
= 0 V; V
= 0 V; 2.7 V < V
= 50 ns):
= 0 V; V
= 0 V; 2.7 V < V
-V
50
50
30
CC
-V X2 mode
CC
= 5 V
33.3
30
= 5 V
CC <
CC <
10%; -M and -V ranges.
5.5 V; -L range.
10%; -M and -V ranges.
5.5 V; -L range.
TS80C31X2
-L X1 mode
33.3
30
100
100
-L
80
-L X2 mode
20
50
31