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<When reading>
E, OC (ALS245A)
A
/D
–A
8
8
15
A
/D
–A
16
0
RD
External memory
data output A (ALS245A)
<When writing>
1
1
E, OC (ALS245A)
1Q (AC74)
2Q(AC74)
WO, WE
A
/D
–A
8
8
15
A
/D
–A
16
0
23
External memory
data output B
(ALS245A)
Fig. 17.1.16 Timing chart for sample circuit using bus buffers (at low-speed running-2)
/D
15
/D
23
7
/D
15
/D
7
7751 Group User's Manual
225 (min.)
5 (max.)
A
AC32 (t
)
PHL
ALS245A
(t
/t
PZH
PZL
225 (min.)
35 (max.)
A
ALS245A
(t
PHL
APPLICATIONS
17.1 Memory expansion
40.5 (min.)
AC32 (t
)
D
AC04 (t
PLH
AC32
2 (t
D
ALS245A
/t
)
(t
PLH
D
Write hold time
(Unit : ns)
A
)
PLH
ALS245A
(t
/t
)
PHZ
PLZ
)+AC74 (t
)
PLH
)
PLH
/t
)
PHZ
PLZ
17–21
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