ETC CY7C274

74
CY7C271
CY7C274
32K x 8 Power Switched and
Reprogrammable PROM
HIGH), the 7C271/7C274 automatically powers down into a
low-power stand-by mode. The CY7C271 is packaged in the
300-mil slim package. The CY7C274 is packaged in the industry standard 600-mil package. Both the 7C271 and 7C274 are
available in a cerDIP package equipped with an erasure window to provide for reprogrammability. When exposed to UV
light, the PROM is erased and can be reprogrammed. The
memory cells utilize proven EPROM floating gate technology
and byte-wide intelligent programming algorithms.
Features
• CMOS for optimum speed/power
• Windowed for reprogrammability
• High speed
— 30 ns (commercial)
— 35 ns (military)
• Low power
— 660 mW (commercial)
Functional Description
The CY7C271 and CY7C274 are high-performance
32,768-word by 8-bit CMOS PROMs. When disabled (CE
Reading the 7C271 is accomplished by placing active LOW
signals on CS1 and CE, and an active HIGH on CS2. Reading the
7C274 is accomplished by placing active LOW signals on OE and
CE. The contents of the memory location addressed by the address
lines (A0 − A14) will become available on the output lines (O0 − O7).
Pin Configurations
LogicBlockDiagram
DIP/Flatpack
A9
A8
A7
A6
O7
A14
A13
A12
X ADDRESS
256 x 1024
PROGRAMABLE
ARRAY
A11
A10
8 x 1 OF 128
MULTIPLEXER
13
16
GND
14
15
A5
A4
O3
A3
Y ADDRESS
A2
27
26
O2
O4
A6
2
3
4
O0
O1
A5
A4
A3
A2
A1
A0
A8
A7
28
25
5
24
6 7C271 23
22
7
21
8
9
20
10
19
11
18
12
17
O6
O5
A9
1
DIP/Flatpack
VCC
A10
A11
A12
VPP
A12
A7
A6
A13
A14
CS1
A5
A4
A3
A2
A1
A0
LCC/PLCC (Opaque Only)
A6
A5
A4
A3
A2
A1
A0
NC
O0
4 3 2 1 32 31 30
29
5
28
7C271
6
27
7
26
8
25
9
24
10
23
11
22
12
21
13
14151617 181920
•
San Jose
A0
O1
POWER–DOWN
O0
Cypress Semiconductor Corporation
Document #: 38-04008 Rev. **
O1
O2
GND
NC
O3
O4
O5
CE
(7C271) CS1
(7C271) CS2
(7C274) OE
•
3901 North First Street
•
27
26
O0
O1
O2
13
16
GND
14
15
VCC
A14
A13
A8
A9
A11
OE
A10
CE
O7
O6
O5
O4
O3
LCC/PLCC (Opaque Only)
A7
A8
A9
NC
VCC
A10
A11
O2
A1
28
2
3
4
25
5
24
7C274
6
23
22
7
21
8
9
20
10
19
11
18
12
17
CS2
CE
O7
O6
O5
O4
O3
1
A7
A12
VPP
NC
VCC
A14
A13
•
•
•
•
— 715 mW (military)
Super low standby power
— Less than 165 mW when deselected
EPROM technology 100% programmable
Slim 300-mil package (7C271)
Direct replacement for bipolar PROMs
Capable of withstanding >2001V static discharge
A12
A13
A14
NC
CS1
CS2
CE
O7
O6
A6
A5
A4
A3
A2
A1
A0
NC
O0
4 3 2 1 32 31 30
29
5
28
7C274
6
27
7
26
8
25
9
24
10
23
11
22
12
21
13
14151617 181920
A8
A9
A11
NC
OE
A10
CE
O7
O6
O1
O2
GND
NC
O3
O4
O5
•
The CY7C271 and CY7C274 offer the advantage of lower
power, superior performance, and programming yield. The
EPROM cell requires only 12.5V for the super voltage, and low
current requirements allow for gang programming. The
EPROM cells allow each memory location to be tested 100%
because each location is written into, erased, and repeatedly
exercised prior to encapsulation. Each PROM is also tested for
AC performance to guarantee that after customer programming, the product will meet DC and AC specification limits.
CA 95134 • 408-943-2600
Revised March 4, 2002
CY7C271
CY7C274
Selection Guide
7C271-30
7C274-30
7C271-35
7C274-35
7C271-45
7C274-45
7C271-55
7C274-55
Maximum Access Time (ns)
30
35
45
55
Maximum Operating
Current (mA)
Com’l
120
120
120
120
130
130
130
Standby Current
(mA)
Com’l
30
30
30
40
40
40
Military
30
Military
Maximum Ratings
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
(Above which the useful life may be impaired. For user guidelines, not tested.)
Latch-Up Current..................................................... >200 mA
UV Exposure ................................................ 7258 Wsec/cm2
Storage Temperature ..................................... −65°C to +150°C
Operating Range
Ambient Temperature with
Power Applied..................................................−55°C to +125°C
Supply Voltage to Ground Potential .................−0.5V to +7.0V
Range
Ambient
Temperature
VCC
DC Voltage Applied to Outputs
in High Z State .....................................................−0.5V to +7.0V
Commercial
0°C to +70°C
5V ±10%
−40°C to +85°C
5V ±10%
−55°C to +125°C
5V ±10%
Industrial
DC Input Voltage .................................................−3.0V to +7.0V
[1]
Military[2]
DC Program Voltage .....................................................13.0V
Electrical Characteristics Over the Operating Range[3]
7C271-30, 35, 45, 55
7C274-30, 35, 45, 55
Parameter
Description
Test Conditions
Output HIGH Voltage
VCC = Min., IOH = −2.0 mA
VOL
Output LOW Voltage
[4]
VCC = Min., IOL = 8.0 mA
VIH
Input HIGH Level
Guaranteed Input Logical HIGH Voltage for All
Inputs
VIL
Input LOW Level
Guaranteed Input Logical LOW Voltage for All
Inputs
IIX
Input Current
GND < VIN < VCC
IOZ
Output Leakage Current
IOS
Output Short Circuit Current[5]
ICC
Power Supply Current
VCC = Max., VIN = 2.0V,
IOUT = 0 mA, CE=VIL
VCC = Max., CE = VIH,
IOUT = 0 mA
VOH
ISB
Standby Supply Current
VPP
Programming Supply Voltage
IPP
Programming Supply Current
VIHP
Input HIGH Programming
Voltage
VILP
Input LOW Programming
Voltage
Min.
Max.
2.4
Unit
V
0.4
V
VCC
V
0.8
V
−10
+10
µA
GND < VOUT < VCC, Output Disabled
−40
+40
µA
VCC = Max., VOUT = GND
−20
−90
mA
Commercial
120
mA
Military
130
Commercial
30
2.0
Military
mA
40
12
13
V
50
mA
3.0
V
0.4
V
Note:
1. Contact a Cypress representative for information on industrial temperature range specifications.
2. TA is the “instant on” case temperature.
3. See the last page of this specification for Group A subgroup testing information.
4. 6.0 mA military
5. For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds.
Document #: 38-04008 Rev. **
Page 2 of 15
CY7C271
CY7C274
Capacitance[6]
Parameter
Description
CIN
Input Capacitance
COUT
Output Capacitance
Test Conditions
TA = 25°C, f = 1 MHz,
VCC = 5.0V
Max.
Unit
10
pF
10
pF
AC Test Loads and Waveforms[6]
R1 500Ω
658Ω MIL
5V
R1 500Ω
658Ω MIL
5V
OUTPUT
30 pF
R2 333Ω
(403Ω MIL)
5 pF
(a) Normal Load
OUTPUT
R2 333Ω
(403Ω MIL)
90%
10%
90%
10%
GND
≤ 5 ns
≤ 5 ns
INCLUDING
JIG AND
SCOPE
INCLUDING
JIG AND
SCOPE
Equivalent to:
ALL INPUT PULSES
3.0V
OUTPUT
(b) HighZ Load
THÉVENIN EQUIVALENT
200Ω
250Ω
2.00V COMMERCIAL
OUTPUT
1.90V MILITARY
Switching Characteristics Over the Operating Range[3,6]
7C271-30
7C274-30
Parameter
Description
7C271-35
7C274-35
7C271-45
7C274-45
7C271-55
7C274-55
Min. Max. Min. Max. Min. Max. Min. Max.
Unit
tAA
Address to Output Valid
30
35
45
55
ns
tHZCS
Chip Select Inactive to High Z (CS1 and CS2,
7C271 Only)
20
25
30
30
ns
tACS
Chip Select Active to Output Valid (CS1 and CS2,
7C271 Only)
20
25
30
30
ns
tHZOE
Output Enable Inactive to High Z (OE, 7C274
Only)
20
20
25
25
ns
tOE
Output Enable Active to Output Valid (OE, 7C274
Only)
20
20
25
25
ns
tHZCE
Chip Enable Inactive to High Z (CE Only)
35
40
50
60
ns
tACE
Chip Enable Active to Output Valid (CE Only)
35
40
50
60
ns
tPU
Chip Enable Active to Power Up
tPD
Chip Enable Inactive to Power Down
tOH
Output Hold from Address Change
0
0
35
0
0
40
0
0
50
0
ns
60
0
ns
ns
Note:
6. See Introduction to CMOS PROMs for general information on testing.
Document #: 38-04008 Rev. **
Page 3 of 15
CY7C271
CY7C274
Switching Waveform
tPU
tPD
VCC
SUPPLY
CURRENT
50%
POWER-DOWN CONTROLLED BY CE
50%
A0 − A14
ADDRESS
CS2
OE, CE, CS1
[7
tAA
(tOE)
tACS(E)
(tHZOE)
tHZCS(E)
tOH
O0 - O7 PREVIOUS DATA VALID
HIGH Z
DATA VALID
Note:
7. CS2 and CS1 are used on the 7C271 only. OE is used on the 7C274 only.
lamp during erasure. Permanent damage may result if the PROM is
exposed to high-intensity UV light for an extended period of time.
7258 Wsec/cm2 is the recommended maximum dosage.
Erasure Characteristics
Wavelengths of light less than 4000 angstroms begin to erase
the 7C271 and 7C274 in the windowed package. For this reason, an opaque label should be placed over the window if the
PROM is exposed to sunlight or fluorescent lighting for extended periods of time.
Programming Modes
Programming support is available from Cypress as well as
from a number of third-party software vendors. For detailed
programming information, including a listing of software packages, please see the PROM Programming Information located
at the end of this section. Programming algorithms can be obtained from any Cypress representative.
The recommended dose of ultraviolet light for erasure is a
wavelength of 2537 angstroms for a minimum dose (UV intensity × exposure time) of 25 Wsec/cm2. For an ultraviolet lamp with a
12 mW/cm2 power rating, the exposure time would be approximately
35 minutes. The 7C271 or 7C274 needs to be within 1 inch of the
Table 1. CY7C271 Mode Selection
Pin Function[8]
Read or Output Disable
A14–A0
CE
CS2
CS1
O7–O0
Other
A14–A0
VFY
PGM
VPP
D7–D0
Read
A14–A0
VIL
VIH
VIL
O7–O0
Power Down
A14–A0
VIH
X
X
High Z
Output Disable
A14–A0
X
VIL
X
High Z
Output Disable
A14–A0
X
X
VIH
High Z
Program
A14–A0
VIHP
VILP
VPP
D7–D0
Program Verify
A14–A0
VILP
VIHP/VILP
VPP
O7–O0
Program Inhibit
A14–A0
VIHP
VIHP
VPP
High Z
Blank Check
A14–A0
VILP
VIHP/VILP
VPP
O7–O0
Mode
Document #: 38-04008 Rev. **
Page 4 of 15
CY7C271
CY7C274
Table 2. CY7C274 Mode Selection
Pin Function[8]
Read or Output Disable
A14–A0
OE
CE
VPP
O7–O0
Other
A14–A0
VFY
PGM
VPP
D7–D0
Read
A14–A0
VIL
VIL
Note 9
O7–O0
Output Disable
A14–A0
VIH
X
X
High Z
Power Down
A14–A0
X
VIH
X
High Z
Program
A14–A0
VIHP
VILP
VPP
D7–D0
Program Verify
A14–A0
VILP
VIHP/VILP
VPP
O7–O0
Program Inhibit
A14–A0
VIHP
VIHP
VPP
High Z
Blank Check
A14–A0
VILP
VIHP/VILP
VPP
O7–O0
Mode
Note:
8. X can be VIL (VILP) or VIH (VIHP).
9. VPP should be tied to VCC ±5% in read mode.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
A10
A11
A12
A13
A14
VPP
PGM
VFY
D7
D6
D5
D4
D3
A6
A5
A4
A3
A2
A1
A0
NC
D0
1
2
3
4
5
7C274
6
7
8
9
10
11
12
13
28
27
26
14
15
25
24
23
22
21
20
19
18
17
16
A12
A13
A14
NC
VPP
PGM
VFY
D7
D6
LCC
Top View
VCC
A14
A13
A8
A9
A11
VFY
A10
PGM
D7
D6
D5
D4
D3
A7
A12
VPP
NC
VCC
A14
A13
DIP
Top View
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
D0
D1
D2
GND
4 3 2 1 32 31 30
29
5
28
6
27
7C271
7
26
8
25
9
24
10
23
11
22
12
21
13
14151617 181920
D1
D2
GND
NC
D3
D4
D5
1
2
3
4
5
7C271
6
7
8
9
10
11
12
13
14
A6
A5
A4
A3
A2
A1
A0
NC
D0
4 3 2 1 32 31 30
29
5
28
6
7C274
27
7
26
8
25
9
24
10
23
11
22
12
21
13
14151617 181920
A8
A9
A11
NC
VFY
A10
PGM
D7
D6
D1
D2
GND
NC
D3
D4
D5
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
D0
D1
D2
GND
LCC
Top View
A7
A8
A9
NC
VCC
A10
A11
DIP
Top View
Figure 1. Programming Pinouts
Document #: 38-04008 Rev. **
Page 5 of 15
CY7C271
CY7C274
Typical DC and AC Characteristics
1.2
1.0
TA =25°C
f = fMAX
0.6
4.0
4.5
5.0
5.5
1.1
1.0
0.9
0.8
−55
6.0
SUPPLYVOLTAGE (V)
1.6
1.4
1.2
1.0
0.8
25
1.0
0.8
0.6
TA =25°C
0.4
4.0
4.5
5.0
5.5
6.0
SUPPLYVOLTAGE (V)
OUTPUT SOURCE CURRENT
vs. VOLTAGE
TYPICAL ACCESS TIME CHANGE
vs. OUTPUT LOADING
40
60
50
40
30
20
30
20
10
VCC =4.5V
TA =25°C
10
0
125
0
1.0
AMBIENT TEMPERATURE (°C)
OUTPUT SINK CURRENT (mA)
125
DELTA t AA (ns)
OUTPUT SOURCE CURRENT (mA)
NORMALIZED ACCESS TIME
NORMALIZED ACCESS TIME
vs. TEMPERATURE
0.6
−55
25
1.2
AMBIENT TEMPERATURE (°C)
2.0
3.0
0
4.0
0
OUTPUT VOLTAGE (V)
200
400
600
800 1000
CAPACITANCE (pF)
NORMALIZED SUPPLY CURRENT
vs. CYCLE PERIOD
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
175
1.1
150
1.0
NORMALIZED ICC
0.8
NORMALIZED ACCESS TIME
1.2
NORMALIZED ICC
NORMALIZED ICC
1.6
1.4
NORMALIZED ACCESS TIME
vs. SUPPLY VOLTAGE
NORMALIZED SUPPLY CURRENT
vs. AMBIENTTEMPERATURE
NORMALIZED SUPPLY CURRENT
vs. SUPPLY VOLTAGE
125
100
75
VCC =5.0V
TA =25°C
50
25
0
0.0
1.0
2.0
3.0
OUTPUT VOLTAGE (V)
4.0
0.9
0.8
0.7
0.6
0
50
100
150
200
250
CYCLE PERIOD (ns)
C271-14
Document #: 38-04008 Rev. **
Page 6 of 15
CY7C271
CY7C274
Ordering Information[10]
Speed
(ns)
30
35
45
55
Ordering Code
Package
Name
Package Type
CY7C271-30JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C271-30PC
P21
28-Lead (300-Mil) Molded DIP
CY7C271-30WC
W22
28-Lead (300-Mil) Windowed CerDIP
CY7C271-35JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C271-35PC
P21
28-Lead (300-Mil) Molded DIP
CY7C271-35WC
W22
28-Lead (300-Mil) Windowed CerDIP
CY7C271-35DMB
D22
28-Lead (300-Mil) CerDIP
CY7C271-35KMB
K74
28-Lead Rectangular Cerpack
CY7C271-35LMB
L55
32-Pin Rectangular Leadless Chip Carrier
CY7C271-35QMB
Q55
32-Pin Windowed Rectangular Leadless Chip Carrier
CY7C271-35WMB
W22
28-Lead (300-Mil) Windowed CerDIP
CY7C271-45JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C271-45PC
P21
28-Lead (300-Mil) Molded DIP
CY7C271-45WC
W22
28-Lead (300-Mil) Windowed CerDIP
CY7C271-45DMB
D22
28-Lead (300-Mil) CerDIP
CY7C271-45KMB
K74
28-Lead Rectangular Cerpack
CY7C271-45LMB
L55
32-Pin Rectangular Leadless Chip Carrier
CY7C271-45QMB
Q55
32-Pin Windowed Rectangular Leadless Chip Carrier
CY7C271-45TMB
T74
28-Lead Windowed Cerpack
CY7C271-45WMB
W22
28-Lead (300-Mil) Windowed CerDIP
CY7C271-55JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C271-55PC
P21
28-Lead (300-Mil) Molded DIP
CY7C271-55WC
W22
28-Lead (300-Mil) Windowed CerDIP
CY7C271-55DMB
D22
28-Lead (300-Mil) CerDIP
CY7C271-55KMB
K74
28-Lead Rectangular Cerpack
CY7C271-55LMB
L55
32-Pin Rectangular Leadless Chip Carrier
CY7C271-55QMB
Q55
32-Pin Windowed Rectangular Leadless Chip Carrier
CY7C271-55TMB
T74
28-Lead Windowed Cerpack
CY7C271-55WMB
W22
28-Lead (300-Mil) Windowed CerDIP
Operating
Range
Commercial
Commercial
Military
Commercial
Military
Commercial
Military
Note:
10. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product availability.
Document #: 38-04008 Rev. **
Page 7 of 15
CY7C271
CY7C274
Ordering Information[10] (Continued)
Speed
(ns)
30
35
45
55
Ordering Code
Package
Name
Package Type
CY7C274-30JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C274-30PC
P15
28-Lead (600-Mil) Molded DIP
CY7C274-30WC
W16
28-Lead (600-Mil) Windowed CerDIP
CY7C274-35JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C274-35PC
P15
28-Lead (600-Mil) Molded DIP
CY7C274-35WC
W16
28-Lead (600-Mil) Windowed CerDIP
CY7C274-35DMB
D16
28-Lead (600-Mil) CerDIP
CY7C274-35KMB
K74
28-Lead Rectangular Cerpack
CY7C274-35LMB
L55
32-Pin Rectangular Leadless Chip Carrier
CY7C274-35QMB
Q55
32-Pin Windowed Rectangular Leadless Chip Carrier
CY7C274-35TMB
T74
28-Lead Windowed Cerpack
CY7C274-35WMB
W16
28-Lead (600-Mil) Windowed CerDIP
CY7C274-45JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C274-45PC
P15
28-Lead (600-Mil) Molded DIP
CY7C274-45WC
W16
28-Lead (600-Mil) Windowed CerDIP
CY7C274-45DMB
D16
28-Lead (600-Mil) CerDIP
CY7C274-45KMB
K74
28-Lead Rectangular Cerpack
CY7C274-45LMB
L55
32-Pin Rectangular Leadless Chip Carrier
CY7C274-45QMB
Q55
32-Pin Windowed Rectangular Leadless Chip Carrier
CY7C274-45TMB
T74
28-Lead Windowed Cerpack
CY7C274-45WMB
W16
28-Lead (600-Mil) Windowed CerDIP
CY7C274-55JC
J65
32-Lead Plastic Leaded Chip Carrier
CY7C274-55PC
P15
28-Lead (600-Mil) Molded DIP
CY7C274-55WC
W16
28-Lead (600-Mil) Windowed CerDIP
CY7C274-55DMB
D16
28-Lead (600-Mil) CerDIP
CY7C274-55KMB
K74
28-Lead Rectangular Cerpack
CY7C274-55LMB
L55
32-Pin Rectangular Leadless Chip Carrier
CY7C274-55QMB
Q55
32-Pin Windowed Rectangular Leadless Chip Carrier
CY7C274-55TMB
T74
28-Lead Windowed Cerpack
CY7C274-55WMB
W16
28-Lead (600-Mil) Windowed CerDIP
Document #: 38-04008 Rev. **
Operating
Range
Commercial
Commercial
Military
Commercial
Military
Commercial
Military
Page 8 of 15
CY7C271
CY7C274
MILITARY SPECIFICATIONS
Group A Subgroup Testing
DC Characteristics
Parameter
VOH
Switching Characteristics
Subgroups
Parameter
Subgroups
1, 2, 3
tAA
7, 8, 9, 10, 11
VOL
1, 2, 3
tACS[11]
7, 8, 9, 10, 11
VIH
1, 2, 3
tOE[12]
7, 8, 9, 10, 11
VIL
1, 2, 3
tACE
7, 8, 9, 10, 11
IIX
1, 2, 3
IOZ
1, 2, 3
Note:
11. 7C271 only (CS1 and CS2).
12. 7C274 only.
ICC
1, 2, 3
ISB
1, 2, 3
SMD Cross Reference
SMD
Number
Suffix
Cypress
Number
5962-89817
01XX
CY7C271-55WMB
5962-89817
01YX
CY7C271-55TMB
5962-89817
01ZX
CY7C271-55QMB
5962-89817
02XX
CY7C271-45WMB
5962-89817
02YX
CY7C271-45TMB
5962-89817
02ZX
CY7C271-45QMB
Package Diagrams
28-Lead (600-Mil) CerDIP D16
MIL-STD-1835 D-10 Config. A
51-80019
Document #: 38-04008 Rev. **
Page 9 of 15
CY7C271
CY7C274
Package Diagrams (continued)
28-Lead (300-Mil) CerDIP D22
MIL-STD-1835 D-15 Config. A
51-80032
28-Lead Rectangular Cerpack K74
MIL-STD-1835 F-11 Config. A
51-80061
Document #: 38-04008 Rev. **
Page 10 of 15
CY7C271
CY7C274
Package Diagrams (continued)
32-Pin Rectangular Leadless Chip Carrier L55
MIL-STD-1835 C-12
51-80068
28-Lead (600-Mil) Molded DIP P15
51-85017-A
Document #: 38-04008 Rev. **
Page 11 of 15
CY7C271
CY7C274
Package Diagrams (continued)
28-Lead (300-Mil) Molded DIP P21
51-85014-B
32-Pin Windowed Rectangular Leadless Chip Carrier Q55
MIL-STD-1835 C-12
51-80103-*A
Document #: 38-04008 Rev. **
Page 12 of 15
CY7C271
CY7C274
Package Diagrams (continued)
28-Lead Windowed Cerpack T74
28-Lead (600-Mil) Windowed CerDIP W16
MIL-STD-1835 D-10 Config. A
Document #: 38-04008 Rev. **
Page 13 of 15
CY7C271
CY7C274
Package Diagrams (continued)
28-Lead (300-Mil) Windowed CerDIP W22
MIL-STD-1835 D-15 Config. A
51-80087
Document #: 38-04008 Rev. **
Page 14 of 15
© Cypress Semiconductor Corporation, 2002. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize
its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.
CY7C271
CY7C274
Document Title: CY7C271 CY7C274 32K x 8 Power Switched and Reprogrammable PROM
Document Number: 38-04008
REV.
ECN NO.
Issue
Date
Orig. of
Change
**
113864
3/8/02
DSG
Document #: 38-04008 Rev. **
Description of Change
Change from Spec number: 38-00068 to 38-04008
Page 15 of 15