DS89C420 Dallas Semiconducotr, DS89C420 Datasheet - Page 46

• Manufacturer Part Number: DS89C420
• Description: Ultra-High-Speed Microcontroller
• Manufacturer: Dallas Semiconducotr

ALE Pulse Width
Port 0 Instruction Address
Valid to ALE Low
Port 2 Instruction Address
Valid to ALE Low
Port 0 Data AddressValid
to ALE Low
Program Address Hold
After ALE Low
Address Hold After ALE
Low MOVX Write
Address Hold After ALE
Low MOVX Read
ALE Low to Valid
Instruction In
ALE Low to PSEN Low
Program Fetch
PSEN Pulse Width for
System Clock
External Oscillator
External Crystal
Table 17. AC CHARACTERISTICS
(V
PARAMETER
CC
= 4.5V to 5.5V; T
SYMBOL
1 / t
1 / t
A
t
t
t
t
t
t
t
AVLL2
AVLL3
LLAX2
LLAX3
t
t
t
LHLL
AVLL
LLAX
PLPH
= -40°C to +85°C)*
LLIV
LLPL
CLCL
CLCL
0.5t
0.5t
0.5t
0.5t
0.5t
t
CLCL
+ t
+ t
+ t
MIN
CLCL
CLCL
CLCL
CLCL
CLCL
PAGE MODE 1
0
1
STC3
STC4
STC4
- 5
1 CYCLE
- 2
- 4
- 8
- 8
- 8
MAX
33
33
0.5t
1.5t
1.5t
1.5t
t
CLCL
t
+ t
+ t
CLCL
MIN
t
CLCL
CLCL
CLCL
CLCL
STC3
PAGE MODE 1
0
1
STC4
STC4
- 2 +
- 5
2 CYCLE
- 4
- 8
- 8
- 8
MAX
33
33
46 of 59
2t
1.5t
2.5t
2.5t
2.5t
2t
CLCL
+ t
+ t
CLCL
MIN
t
CLCL
CLCL
CLCL
CLCL
STC3
PAGE MODE 1
0
1
STC4
STC4
- 4 +
- 5
4 CYCLE
- 5
- 8
- 8
- 8
MAX
33
33
1.5t
0.5t
0.5t
0.5t
0.5t
1.5t
t
CLCL
t
t
CLCL
CLCL
CLCL
CLCL
CLCL
MIN
t
t
t
t
CLCL
CLCL
CLCL
STC3
STC3
STC4
STC4
PAGE MODE 2
0
1
- 2 +
- 2
- 5
- 5 +
- 8 +
- 8 +
- 2
- 8
- 6
2.5t
MAX
CLCL
33
33
- 20
1.5t
0.5t
0.5t
0.5t
0.5t
0.5t
0.5t
2t
t
NON-PAGE MODE
CLCL
CLCL
CLCL
CLCL
CLCL
MIN
CLCL
t
t
t
t
CLCL
CLCL
CLCL
STC3
STC3
STC4
STC4
0
1
- 2
- 5 +
- 2 +
- 8 +
- 8 +
- 5
- 2
- 8
- 6
2.5t
MAX
CLCL
33
33
- 20
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
DS89C420
NOTES
1
2