TS80C54X2YYY-MICD Atmel Corporation, TS80C54X2YYY-MICD Datasheet - Page 46

• Manufacturer Part Number: TS80C54X2YYY-MICD
• Description: 8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP
• Manufacturer: Atmel Corporation

TS80C54X2/C58X2
TS87C54X2/C58X2
10.5 AC Parameters
10.5.1 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 26. 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 28., Table 31. and Table 34. give the description of each AC symbols.
Table 29., Table 32. and Table 35. give for each range the AC parameter.
Table 30., Table 33. and Table 36. 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
46
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= 22 (Table 30.)
T= 50ns
T
AVLL
LLIV
= 2T - x = 2 x 50 - 22 = 78ns
= Time for Address Valid to ALE Low.
Table 27. Max frequency for derating formula regarding the speed grade
-M X1 mode
40
25
Table 26. 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.
-L X1 mode
33.3
30
Rev. C - 15 January, 2001
100
100
80
-L
-L X2 mode
20
50