PRODUCT SELECTOR GUIDE
Family Part Number
Am27C256
V
V
= 5.0 V ± 5%
= 5.0 V ± 10%
-255
CC
CC
Speed Options
-45
45
45
30
-55
55
55
35
-70
70
70
40
-90
-120
120
120
50
-150
150
150
50
-200
200
200
50
Max Access Time (ns)
CE# (E#) Access (ns)
OE# (G#) Access (ns)
90
90
40
250
250
50
CONNECTION DIAGRAMS
Top View
DIP
PLCC
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
VPP
A12
A7
2
A14
4
3 2 1 32 31 30
3
A6
5
6
A13
A8
A9
29
28
A5
A8
A6
4
A4
A3
7
A11
A5
A9
27
26
25
24
23
22
21
5
8
NC
A4
A11
6
A2
9
OE# (G#)
A10
A3
OE# (G#)
A10
7
A1
10
11
12
13
A2
8
A0
CE# (E#)
DQ7
A1
CE# (E#)
DQ7
DQ6
9
NC
DQ0
A0
10
11
12
13
14
DQ6
DQ0
16 17
19 20
18
15
14
DQ1
DQ2
VSS
DQ5
DQ4
DQ3
08007I-3
08007I-2
Notes:
1. JEDEC nomenclature is in parenthesis.
2. Don’t use (DU) for PLCC.
PIN DESIGNATIONS
LOGIC SYMBOL
A0–A14
= Address Inputs
CE# (E#)
= Chip Enable Input
15
DQ0–DQ7 = Data Input/Outputs
8
A0–A14
OE# (G#)
VCC
= Output Enable Input
= VCC Supply Voltage
= Program Voltage Input
= Ground
DQ0–DQ7
CE# (E#)
OE# (G#)
VPP
VSS
NC
= No Internal Connection
08007I-4
2
Am27C256
AMD [ AMD ]
