DS89C420_05 Datasheet, PDF (4/47 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

AC CHARACTERISTICS
(V_CC = 4.5V to 5.5V; T_A = -40°C to +85°C)* (Figure 1, Figure 2, and Figure 3)
PARAMETER
SYMBOL
External Oscillator
(25MHz, 33MHz)
External Crystal
(25MHz, 33MHz)
1 / tCLCL
1 CYCLE
PAGE MODE 1
MIN
MAX
0
25
0
33
1
25
1
33
2 CYCLE
PAGE MODE 1
MIN
MAX
0
25
0
33
1
25
1
33
4 CYCLE
PAGE MODE 1
MIN
MAX
0
25
0
33
1
25
1
33
ALE Pulse Width (Note 2)
tLHLL
0.5tCLCL - 2
+ tSTC3
tCLCL - 2 +
tSTC3
2tCLCL - 4 +
tSTC3
Port 0 Instruction Address
Valid to ALE Low
tAVLL
Port 2 Instruction Address
Valid to ALE Low
tAVLL2
0.5tCLCL - 4
0.5tCLCL - 4
1.5tCLCL - 5
Port 0 Data AddressValid to
ALE Low
tAVLL3
Program Address Hold
After ALE Low
tLLAX
0.5tCLCL - 8
1.5tCLCL - 8
2.5tCLCL - 8
Address Hold After ALE
Low MOVX Write
tLLAX2
0.5tCLCL - 8
+ tSTC4
1.5tCLCL - 8
+ tSTC4
2.5tCLCL - 8
+ tSTC4
Address Hold After ALE
Low MOVX Read
tLLAX3
0.5tCLCL - 8
+ tSTC4
1.5tCLCL - 8
+ tSTC4
2.5tCLCL - 8
+ tSTC4
ALE Low to Valid
Instruction In
tLLIV
DS89C420 Ultra-High-Speed Microcontroller
PAGE MODE 2
MIN
MAX
0
25
0
33
1
25
1
33
1.5tCLCL - 5 +
tSTC3
NON-PAGE MODE
MIN
MAX
0
25
0
33
1
25
1
33
1.5tCLCL - 5 +
tSTC3
tCLCL - 2
0.5tCLCL - 2
UNITS
MHz
ns
ns
0.5tCLCL - 2
tCLCL - 2
ns
tCLCL - 2 +
tSTC3
0.5tCLCL - 2 +
tSTC3
ns
0.5tCLCL - 8
0.5tCLCL - 8
ns
0.5tCLCL - 8 +
tSTC4
0.5tCLCL - 8 +
tSTC4
ns
0.5tCLCL - 8 +
tSTC4
0.5tCLCL - 8 +
tSTC4
ns
2.5tCLCL -
20
2.5tCLCL -
20
ns
ALE Low to PSEN Low
tLLPL
1.5tCLCL - 6
0.5tCLCL - 6
ns
PSEN Pulse Width for
Program Fetch
tPLPH
tCLCL - 5
tCLCL - 5
2tCLCL - 5
tCLCL - 5
2tCLCL - 5
ns
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