Datasheet

DS89C430/DS89C450
4 of 46
AC CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
O
= -40°C to +85°C.) (See Figure 1, Figure 2, and Figure 3.)
1-CYCLE
PAGE MODE 1
2-CYCLE
PAGE MODE 1
4-CYCLE
PAGE MODE 1
PAGE MODE 2 NONPAGE MODE
PARAMETER SYMBOL
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
UNITS
System Clock External
Oscillator (Note 15)
1/t
CLCL
0 33 0 33 0 33 0 33 0 33
System Clock External Crystal
(Note 15)
1/t
CLCL
1 33 1 33 1 33 1 33 1 33
MHz
ALE Pulse Width (Note 16) t
LHLL
0.5t
CLCL
- 2
+ t
STC3
t
CLCL
- 2
+ t
STC3
2t
CLCL
- 4
+ t
STC3
1.5t
CLCL
- 5
+ t
STC3
1.5t
CLCL
- 5
+ t
STC3
ns
Port 0 Instruction Address Valid
to ALE Low
t
AVLL
t
CLCL
- 3 0.5t
CLCL
- 3
ns
Port 2 Instruction Address Valid
to ALE Low
t
AVLL2
0.5t
CLCL
- 4 0.5t
CLCL
- 4 1.5t
CLCL
- 4 0.5t
CLCL
- 4 t
CLCL
- 4
ns
Port 0 Data AddressValid to
ALE Low
t
AVLL3
t
CLCL
- 3 +
t
STC3
0.5t
CLCL
- 3
+ t
STC3
ns
Program Address Hold After
ALE Low
t
LLAX
0.5t
CLCL
- 8 1.5t
CLCL
- 8 2.5t
CLCL
- 8 1t
CLCL
- 10 1t
CLCL
- 10
ns
Address Hold after ALE Low
MOVX Write
t
LLAX2
0.5t
CLCL
- 8
+ t
STC4
1.5t
CLCL
- 8
+ t
STC4
2.5t
CLCL
- 8
+ t
STC3
0.5t
CLCL
- 8
+ t
STC2
0.5t
CLCL
- 8
+ t
STC2
ns
Address Hold after ALE Low
MOVX Read
t
LLAX3
0.5t
CLCL
- 8
+ t
STC4
1.5t
CLCL
- 8
+ t
STC4
2.5t
CLCL
- 8
+ t
STC3
0.5t
CLCL
- 8
+ t
STC3
0.5t
CLCL
- 8
+ t
STC2
ns
ALE Low to Valid Instruction In t
LLIV
2t
CLCL
- 6 2t
CLCL
- 6
ns
ALE Low to PSEN Low t
LLPL
1.5t
CLCL
- 6 0.5t
CLCL
- 2
ns
PSEN Pulse Width for Program
Fetch
t
PLPH
t
CLCL
- 5 t
CLCL
- 5 2t
CLCL
- 5 t
CLCL
- 5 2t
CLCL
- 5
ns