µPD43256B
Read 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
MAX.
Read cycle time
tRC
tAA
70
ns
Address access time
70
70
35
85
85
40
ns
ns
ns
ns
ns
ns
ns
ns
Note 1
Note 2
CS access time
tACS
tOE
OE access time
Output hold from address change
CS to output in low impedance
OE to output in low impedance
CS to output in high impedance
OE to output in high impedance
tOH
10
10
5
10
10
5
tCLZ
tOLZ
tCHZ
tOHZ
30
30
30
30
Notes 1. See the output load shown in Figure 1 except for µPD43256B-A, 43256B-B.
2. 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.
Read 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.
Read cycle time
tRC
tAA
85
100
120
100
120
150
ns
Address access time
85
85
50
100
100
60
120
120
60
100
100
60
120
120
60
150 ns Note
150 ns
70 ns
ns
CS access time
tACS
tOE
OE access time
Output hold from address change
CS to output in low impedance
OE to output in low impedance
CS to output in high impedance
OE to output in high impedance
tOH
10
10
5
10
10
5
10
10
5
10
10
5
10
10
5
10
10
5
tCLZ
tOLZ
tCHZ
tOHZ
ns
ns
35
35
35
35
40
40
35
35
40
40
50 ns
50 ns
Note Loading condition is 1TTL + 100 pF.
Remark These AC characteristics are in common regardless of package types and L, LL versions.
10
NEC [ NEC ]
