DS89C420_02 Datasheet, PDF (46/58 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

Table 17. AC CHARACTERISTICS
PARAMETER
System Clock
External Oscillator
External Crystal
SYMBOL
1 / tCLCL
1 / tCLCL
1 CYCLE
PAGE MODE 1
MIN
MAX
0
33
1
33
ALE Pulse Width
t LHLL
0.5tCLCL - 2
+ tSTC3
2 CYCLE
PAGE MODE 1
MIN
MAX
0
33
1
33
tCLCL - 2 +
t STC3
Port 0 Instruction Address
Valid to ALE Low
t AVLL
Port 2 Instruction Address
Valid to ALE Low
t AVLL2
0.5tCLCL - 4
0.5tCLCL - 4
Port 0 Data AddressValid
to ALE Low
t AVLL3
Program Address Hold
After ALE Low
t LLAX
0.5tCLCL - 8
1.5tCLCL - 8
Address Hold After ALE
Low MOVX Write
t LLAX2
0.5tCLCL - 8
+ tSTC4
1.5tCLCL - 8
+ tSTC4
Address Hold After ALE
Low MOVX Read
t LLAX3
0.5tCLCL - 8
+ tSTC4
1.5tCLCL - 8
+ tSTC4
ALE Low to Valid
Instruction In
t LLIV
DS89C420
4 CYCLE
PAGE MODE 1
MIN
MAX
(V_CC = 4.5V to 5.5V; T _A = -40°C to +85°C)*
PAGE MODE 2
MIN
MAX
NON-PAGE MODE
MIN
MAX
UNITS NOTES
0
33
0
33
0
33
MHz
1
1
33
1
33
1
33
2tCLCL - 4 +
t STC3
1.5tCLCL - 5 +
t STC3
1.5tCLCL - 5 +
t STC3
ns
2
tCLCL - 2
0.5tCLCL - 2
ns
1.5tCLCL - 5
2.5tCLCL - 8
2.5tCLCL - 8
+ tSTC4
2.5tCLCL - 8
+ tSTC4
0.5tCLCL - 2
tCLCL - 2
ns
tCLCL - 2 +
0.5tCLCL - 2 +
ns
t STC3
t STC3
0.5tCLCL - 8
0.5tCLCL - 8
ns
0.5tCLCL - 8 +
0.5tCLCL - 8 +
ns
t STC4
t STC4
0.5tCLCL - 8 +
0.5tCLCL - 8 +
ns
t STC4
t STC4
2.5tCLCL - 20
2.5tCLCL - 20
ns
ALE Low to PSEN Low
t LLPL
1.5tCLCL - 6
0.5tCLCL - 6
ns
PSEN Pulse Width for
Program Fetch
PSEN Low to Valid
Instruction In
t PLPH
t PLIV
tCLCL - 5
tCLCL - 5
2tCLCL - 5
tCLCL - 5
2tCLCL - 5
ns
tCLCL - 18
tCLCL - 18
2tCLCL - 18
tCLCL - 18
2tCLCL - 18
ns
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