µPD43256B
Write Cycle (1/2)
VCC ≥ 4.5 V
µPD43256B-85
Parameter
Symbol
µPD43256B-70
µPD43256B-A85/A10/A12
µPD43256B-B10/B12/B15
Unit Condition
MIN.
MAX.
MIN.
85
70
70
60
35
0
MAX.
Write cycle time
tWC
tCW
tAW
tWP
tDW
tDH
70
50
50
55
30
0
ns
ns
ns
ns
ns
ns
ns
ns
CS to end of write
Address valid to end of write
Write pulse width
Data valid to end of write
Data hold time
Address setup time
tAS
0
0
Write recovery time
tWR
tWHZ
tOW
0
0
WE to output in high impedance
Output active from end of write
30
30
ns
ns
Note
10
10
Note See the output load shown in Figure 2 except for µPD43256B-A, 43256B-B.
Remark These AC characteristics are in common regardless of package types and L, LL versions.
Write Cycle (2/2)
VCC ≥ 3.0 V
VCC ≥ 2.7 V
Con-
Parameter
Symbol µPD43256B-A85 µPD43256B-A10 µPD43256B-A12 µPD43256B-B10 µPD43256B-B12 µPD43256B-B15 Unit
dition
MIN. MAX. MIN. MAX. MIN. MAX. MIN. MAX. MIN. MAX. MIN. MAX.
Write cycle time
tWC
tCW
tAW
tWP
tDW
tDH
85
70
70
60
60
0
100
70
70
60
60
0
120
90
90
80
70
0
100
70
70
60
60
0
120
90
90
80
70
0
150
100
100
90
80
0
ns
ns
ns
ns
ns
ns
ns
ns
CS to end of write
Address valid to end of write
Write pulse width
Data valid to end of write
Data hold time
Address setup time
tAS
0
0
0
0
0
0
Write recovery time
tWR
tWHZ
tOW
0
0
0
0
0
0
WE to output in high impedance
Output active from end of write
30
35
40
35
40
50 ns Note
10
10
10
10
10
10
ns
Note Loading condition is 1TTL + 100 pF.
Remark These AC characteristics are in common regardless of package types and L, LL versions.
12
NEC [ NEC ]
