Preliminary W77E516
11. AC CHARACTERISTICS
t
CLCL
t
CLCH
t
CLCX
t
CHCL
t
CHCX
External Clock Characteristics
PARAMETER
Clock High Time
Clock Low Time
Clock Rise Time
Clock Fall Time
Note: Duty cycle is 50 %.
SYMBOL
t
CHCX
t
CLCX
t
CLCH
t
CHCL
MIN.
12.5
12.5
-
-
TYP.
-
-
-
-
MAX.
-
-
10
10
UNITS
nS
nS
nS
nS
NOTES
AC Specification
PARAMETER
Oscillator Frequency
ALE Pulse Width
Address Valid to ALE Low
Address Hold After ALE Low
Address Hold After ALE Low for MOVX Write
ALE Low to Valid Instruction In
ALE Low to PSEN Low
PSEN
PSEN
Pulse Width
Low to Valid Instruction In
SYM.
1/t
CLCL
t
LHLL
t
AVLL
t
LLAX1
t
LLAX2
t
LLIV
t
LLPL
t
PLPH
t
PLIV
t
PXIX
t
PXIZ
t
AVIV1
t
AVIV2
t
PLAZ
t
RHDX
t
RHDZ
t
RLAZ
0
0
t
CLCL
- 5
0.5 t
CLCL
- 5
0
t
CLCL
- 5
3.0 t
CLCL
- 20
3.5 t
CLCL
- 20
0.5 t
CLCL
- 5
2.0 t
CLCL
- 5
2.0 t
CLCL
- 20
VARIABLE
CLOCK
MIN.
0
1.5 t
CLCL
- 5
0.5 t
CLCL
- 5
0.5 t
CLCL
- 5
0.5 t
CLCL
- 5
2.5 t
CLCL
- 20
VARIABLE
CLOCK
MAX.
40
UNITS
MHz
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
Input Instruction Hold After PSEN
Input Instruction Float After PSEN
Port 0 Address to Valid Instr. In
Port 2 Address to Valid Instr. In
PSEN
Low to Address Float
Data Hold After Read
Data Float After Read
RD
Low to Address Float
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