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¡ Semiconductor
AC Characteristics
(1) External program memory access AC characteristics
Parameter
XTAL1, XTAL 2 Oscillation Cycle
ALE Signal Width
Address Setup Time
(to ALE Falling Edge)
Address Hold Time
(from ALE Falling Edge)
Instruction Data Read Time
(from ALE Falling Edge)
From ALE Falling Edge to PSEN
Falling Edge
PSEN Signal Width
Instruction Data Read Time
(from PSEN Falling Edge)
Instruction Data Hold Time
(from PSEN Rising Edge)
Bus Floating Time after Instruction
Data Read (from PSEN Rising Edge)
Instruction Data Read Time
(from Address Output)
Bus Floating Time(PSEN Rising
Edge from Address float)
Address Output Time from PSEN
Rising Edge
*1 The variable check is from 0 to 24 MHz when the external check is used.
PORT 0, ALE, and PSEN connected with 100pF load, other connected with 80pF load
Symble
t
CLCL
t
LHLL
t
AVLL
t
LLAX
t
LLPL
t
LLPL
t
PLPH
t
PLIV
t
PXIX
t
PXIZ
t
AVIV
t
AZPL
t
PXAV
MSM80C154S/83C154S
V
=2.2 to 6.0V, V
CC
SS
Variable clock from
1 to 24 MHz
Min.
41.7
2t
-40
CLCL
1t
-15
CLCL
1t
-35
CLCL
—
4t
1t
-30
CLCL
3t
-35
CLCL
—
3t
0
—
1t
—
5t
0
1t
-20
CLCL
=0V, Ta=–40°C to +85°C
*1
Unit
Max.
1000
ns
—
ns
—
ns
—
ns
-100
ns
CLCL
—
ns
—
ns
-45
ns
CLCL
—
ns
-20
ns
CLCL
-105
ns
CLCL
—
ns
—
ns
287
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