30
4428E–8051–02/08
AT/TS80C31X2
Figure 14-5. Clock Signal Waveform for ICC Tests in Active and Idle Modes
14.5
AC Parameters
14.5.1
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 sta-
tus 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 = 0 to +70°C (commercial temperature range); VSS = 0 V; VCC = 5 V ± 10%; -M and -V ranges.
TA = -40°C to +85°C (industrial temperature range); VSS = 0 V; VCC = 5 V ± 10%; -M and -V
ranges.
TA = 0 to +70°C (commercial temperature range); VSS = 0 V; 2.7 V < VCC < 5.5 V; -L range.
TA = -40°C to +85°C (industrial temperature range); VSS = 0 V; 2.7 V < VCC < 5.5 V; -L range.
Table 14-3. 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 14-3.
Load Capacitance versus speed range, in pF
Table 8-5., Table 8-8. and Table 8-11. give the description of each AC symbols.
V
CC-0.5V
0.45V
0.7V
CC
0.2V
CC-0.1
T
CLCH
T
CHCL
TCLCH = TCHCL = 5ns.
-M
-V
-L
Port 0
100
50
100
Port 1, 2, 3
80
50
80
ALE / PSEN
100
30
100