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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/cm2
Selection Guide
27C256-45
27C256-55
27C256-70
27C256-90
27C256-120
27C256-150
27C256-200
Maximum Access Time (ns)
45
55
70
90
120
150
200
Maximum
Operating
Current (mA)
Com’l
45
45
45
45
45
45
45
Mil
55
55
55
55
55
55
55
Standby Current
(mA)
Com’l
15
15
15
15
15
15
15
Mil
20
20
20
20
20
20
20
Chip Select Time (ns)
45
55
70
90
120
150
200
Output Enable Time (ns)
15
20
25
30
30
40
40
Pin Configurations
1
2
3
4
5
6
7
8
9
10
11
14
19
20
24
23
22
21
25
28
27
26
Top View
28-Pin TSOP
12
13
16
15
17
18
OE
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A10
CE
O7
O6
O5
O4
O3
GND
O2
O0
O1
A0
A6
A5
A1
A2
1
2
3
4
5
6
7
8
9
10
11
14
19
20
24
23
22
21
25
28
27
26
T
op View
32-Pin TSOP
12
13
29
32
31
30
16
15
17
18
OE
A1
1
A
9
A
8
A1
3
NC
A1
4
VCC
VP
P
NC
A1
2
A
7
A
6
A
5
NC
A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
NC
O0
A0
A
4
A
3
A1
A2
A4
A3
27c256–4
27c256–5
27C256T
27C256
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