TSC80C31/80C51
Explanation of the AC Symbol
Each timing symbol has 5 characters. The first character Example :
is always a “T” (stands for time). The other characters,
TAVLL = Time for Address Valid to ALE low.
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.
TLLPL = Time for ALE low to PSEN low.
A : Address.
C : Clock.
D : Input data.
Q : Output data.
R : READ signal.
T : Time.
H : Logic level HIGH
I : Instruction (program memory contents).
L : Logic level LOW, or ALE.
P : PSEN.
V : Valid.
W : WRITE signal.
X : No longer a valid logic level.
Z : Float.
AC Parameters
TA= 0 to + 70°C ; Vss= 0 V ; Vcc= 5 V ± 10 % ; F= 0 to 44 MHz
TA= 0 to +70°C ; Vss= 0 V ; 2.7 V <Vcc < 5.5 V ; F= 0 to 16 MHz
TA=–40°to+85°C;Vss=0V;2.7V<Vcc<5.5V;F=0to16MHz
TA= –55° + 125°C; Vss= 0 V; Vcc= 5 V ± 10 % ; F= 0 to 40 MHz
(Load Capacitance for PORT 0, ALE and PSEN = 100 pF ; Load
Capacitance for all other outputs = 80 pF)
External Program Memory Characteristics (values in ns)
16 MHz 20 MHz 25 MHz 30 MHz 36 MHz 40 MHz 44 MHz
min max min max min max min max min max min max min max
SYMBOL
TLHLL
TAVLL
TLLAX
TLLIV
TLLPL
TPLPH
TPLIV
PARAMETER
ALE Pulse Width
110
40
90
30
35
70
20
35
60
15
35
50
10
35
40
9
30
7
Address valid to ALE
Address Hold After ALE
ALE to valid instr in
35
30
20
185
170
130
100
80
70
65
ALE to PSEN
45
40
30
25
80
20
75
15
65
12
54
PSEN pulse Width
165
130
100
PSEN to valid instr in
Input instr Hold After PSEN
Input instr Float After PSEN
PSEN to Address Valid
Address to Valid instr in
PSEN low to Address Float
125
50
110
45
85
35
65
30
50
25
45
20
35
10
TPXIX
TPXIZ
0
0
0
0
0
0
0
TPXAV
TAVIV
TPLAZ
55
50
40
35
30
25
15
230
10
210
10
170
8
130
6
90
5
80
5
70
5
External Program Memory Read Cycle
TAVIV
14
MATRA MHS
Rev. E (14 Jan.97)
TEMIC [ TEMIC SEMICONDUCTORS ]
