Ac characteristics, 5v to 5.5v, t – Rainbow Electronics DS89C450 User Manual
Page 4
DS89C430/DS89C440/DS89C450
4 of 48
AC CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
O
= -40°C to +85°C.) (See
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