
CY27C256
2
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature ................................. -65
°
C to +150
°
C
Ambient Temperature with
Power Applied............................................. -55
°
C to +125
°
C
Supply Voltage to Ground Potential................-0.5V to +7.0V
DC Voltage Applied to Outputs
in High Z State................................................ -0.5V to +7.0V
DC Input Voltage .............................................-3.0V to +7.0V
DC Program Voltage .................................................... 13.0V
Static Discharge Voltage ...........................................>2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current.....................................................>200 mA
UV Exposure ................................................ 7258 Wsec/cm
2
Selection Guide
27C256-45
45
45
55
27C256-55
55
45
55
27C256-70
70
45
55
27C256-90
90
45
55
27C256-120
120
45
55
27C256-150
150
45
55
27C256-200
200
45
55
Maximum Access Time (ns)
Maximum
Operating
Current (mA)
Standby Current
(mA)
Com’l
Mil
Com’l
Mil
15
20
45
15
15
20
55
20
15
20
70
25
15
20
90
30
15
20
120
30
15
20
150
40
15
20
200
40
Chip Select Time (ns)
Output Enable Time (ns)
Pin Configurations
1
2
3
4
5
6
7
8
9
10
11
14
13
19
18
20
24
25
26
23
22
21
28
27
Top View
28-Pin TSOP
12
16
15
17
OE
A
11
A
9
A
8
A
13
A
14
V
CC
V
PP
A
12
A
7
A
6
A
5
A
4
A
3
A
10
CE
O
7
O
6
O
5
O
4
O
GND
O
2
O
1
O
0
A
0
A
1
A
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
19
18
20
24
23
22
21
25
28
27
26
3Top View
29
32
31
30
16
17
OE
A
1
A
9
A
8
A
NC
A
1
V
CC
V
NC
A
1
A
7
A
6
A
5
A
4
A
3
1
3
4
P
2
NC
A
10
CE
O
7
O
6
O
5
O
4
O
GND
O
2
O
1
O
0
NC
A
0
A
1
A
2
27c256–4
27c256–5
27C256T
27C256