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