TS80C51RA2 Atmel Corporation, TS80C51RA2 Datasheet - Page 61

• Manufacturer Part Number: TS80C51RA2
• Description: High Performance 8-bit Microcontroller
• Manufacturer: Atmel Corporation

AC Parameters
Explanation of the AC
Symbols
4188A–8051–10/02
Figure 24. Clock Signal Waveform for I
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
V ranges.
T
-V ranges.
T
range.
T
range.
Table 36. 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 36. Load Capacitance versus speed range, in pF
Table 38., Table 39. and Table 42. give the description of each AC symbols.
Table 39., Table 41. and Table 43. give for each range the AC parameter.
Table 40., Table 42. and Table 44. give the frequency derating formula of the AC param-
eter. 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:
Table 37. Max frequency for derating formula regarding the speed grade
A
A
A
A
T
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
LLPL
T (ns)
Port 0
V
CC
= Time for ALE Low to PSEN Low.
T
-0.5V
0.45V
CHCL
AVLL
T
CLCH
-M X1 mode
= Time for Address Valid to ALE Low.
= T
40
25
CHCL
= 5ns.
100
100
-M
80
T
CLCH
-M X2 mode
20
50
0.7V
0.2V
CC
CC
-0.1
-V X1 mode
CC
Tests in Active and Idle Modes
40
25
-V
50
50
30
-V X2 mode
SS
SS
SS
= 0 V; V
SS
33.3
= 0 V; V
30
= 0 V; 2.7 V < V
= 0 V; 2.7 V < V
CC
TS8xC51Rx2
-L X1 mode
CC
= 5 V ± 10%; -M and -
= 5 V ± 10%; -M and
33.3
30
CC <
100
100
CC <
-L
80
-L X2 mode
5.5 V; -L
5.5 V; -L
20
50
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