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32K x 8 Power Switched and
Reprogrammable PROM
CY7C271
CY7C274
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
Document #: 38-04008 Rev. *B
Revised December 27, 2002
1CY7C274
Features
CMOS for optimum speed/power
Windowed for reprogrammability
High speed
-- 30 ns (Commercial)
-- 35 ns (Military)
Low power
-- 660 mW (commercial)
-- 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
Functional Description
The CY7C271 and CY7C274 are high-performance
32,768-word by 8-bit CMOS PROMs. When disabled (CE
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 CY7C271 and
CY7C274 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 repro-
grammed. The memory cells utilize proven EPROM floating
gate technology and byte-wide intelligent programming
algorithms.
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.
Reading the 7C271 is accomplished by placing active LOW
signals on CS
1
and CE, and an active HIGH on CS
2
. 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 (A
0
-
A
14
) will become available on the output lines (O
0
-
O
7
).
Logic Block Diagram
Pin Configurations
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
24
23
22
21
13
14
25
28
27
26
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
GND
V
CC
A
11
A
12
A
13
O
7
O
6
O
4
O
5
O
3
A
12
A
11
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
POWER-DOWN
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
CE
256 x 1024
PROGRAMABLE
ARRAY
8 x 1 OF 128
MULTIPLEXER
12
31
4
5
6
7
8
9
10
3 2 1
30
13
14151617
26
25
24
23
22
21
11
V CC
A
5
A
4
A
3
A
2
A
6
A
1
A
13
A
14
O
7
O
6
O
4
GND
A
12
A
7
A
8
O
3
O
1
181920
27
28
29
32
NC
O
5
NC
15
A
10
A
13
(7C271) CS
1
(7C274) OE
A
9
A
10
A
14
CS
1
CS
2
CE
A
9
A
10
A
11
CS
1
CS
2
O
0
A
14
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
24
23
22
21
13
14
25
28
27
26
12
31
4
5
6
7
8
9
10
3 2 1
30
13
14151617
26
25
24
23
22
21
11
A
7
V CC
A
12
181920
27
28
29
32
15
NC
A
14
A
13
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
GND
V
CC
A
13
A
8
A
9
O
7
O
6
O
4
O
5
O
3
A
9
A
11
O
7
O
6
A
8
V
PP
A
14
(7C271) CS
2
7C271
7C274
NC
A
11
OE
A
10
CE
NC
CE
O
2
A
0
NC
A
5
A
4
A
3
A
2
A
6
A
1
O
0
A
0
V PP
NC
OE
A
10
CE
O
4
GND
O
3
O
1
NC
O
5
O
2
DIP/Flatpack
DIP/Flatpack
LCC/PLCC (Opaque Only)
7C271
7C274
X ADDRESS
Y ADDRESS
LCC/PLCC (Opaque Only)
CY7C271
CY7C274
Document #: 38-04008 Rev. *B
Page 2 of 11
Maximum Ratings
[1]
(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
7C274-30
7C271-35
7C274-35
7C271-45
7C274-45
7C271-55
Unit
Maximum Access Time
30
35
45
55
ns
Maximum Operating
Current
Com'l
120
120
120
120
mA
Military
130
130
130
mA
Standby Current
Com'l
30
30
30
30
mA
Military
40
40
40
mA
Operating Range
Range
Ambient
Temperature
V
CC
Commercial
0
C to +70
C
5V
10%
Military
[2]
-
55
C to +125
C
5V
10%
Electrical Characteristics
Over the Operating Range
[3]
7C271- 35, 45, 55
7C274-30, 35, 45,
Parameter
Description
Test Conditions
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min., I
OH
=
-
2.0 mA
2.4
V
V
OL
Output LOW Voltage
V
CC
= Min., I
OL
= 8.0 mA
[4]
0.4
V
V
IH
Input HIGH Level
Guaranteed Input Logical HIGH Voltage for All
Inputs
2.0
V
CC
V
V
IL
Input LOW Level
Guaranteed Input Logical LOW Voltage for All
Inputs
0.8
V
I
IX
Input Current
GND < V
IN
< V
CC
-
10
+10
A
I
OZ
Output Leakage Current
GND < V
OUT
< V
CC
, Output Disabled
-
40
+40
A
I
OS
Output Short Circuit Current
[5]
V
CC
= Max., V
OUT
= GND
-
20
-
90
mA
I
CC
Power Supply Current
V
CC
= Max., V
IN
= 2.0V,
I
OUT
= 0 mA, CE=V
IL
Commercial
120
mA
Military
130
I
SB
Standby Supply Current
V
CC
= Max., CE = V
IH
,
I
OUT
= 0 mA
Commercial
30
mA
Military
40
V
PP
Programming Supply Voltage
12
13
V
I
PP
Programming Supply Current
50
mA
V
IHP
Input HIGH Programming
Voltage
3.0
V
V
ILP
Input LOW Programming
Voltage
0.4
V
Notes:
1.
The voltage on any input or I/O pin cannot exceed the power pin during power-up.
2.
T
A
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.
CY7C271
CY7C274
Document #: 38-04008 Rev. *B
Page 3 of 11
Capacitance
[6]
Parameter
Description
Test Conditions
Max.
Unit
C
IN
Input Capacitance
T
A
= 25
C, f = 1 MHz,
V
CC
= 5.0V
10
pF
C
OUT
Output Capacitance
10
pF
AC Test Loads and Waveforms
[6]
3.0V
5V
OUTPUT
R1 500
658
MIL
R2 333
(403
MIL)
30 pF
INCLUDING
JIG AND
SCOPE
GND
90%
10%
90%
10%
5 ns
5 ns
5V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
(a) Normal Load
(b) HighZ Load
OUTPUT
2.00V COMMERCIAL
Equivalent to:
TH VENIN EQUIVALENT
200
ALL INPUT PULSES
OUTPUT
1.90V MILITARY
250
R1 500
658
MIL
R2 333
(403
MIL)
Switching Characteristics
Over the Operating Range
[3,6]
7C274-30
7C271-35
7C274-35
7C271-45
7C274-45
7C271-55
Parameter
Description
Min. Max. Min. Max. Min. Max. Min. Max. Unit
t
AA
Address to Output Valid
30
35
45
55
ns
t
HZCS
Chip Select Inactive to High Z (CS
1
and CS
2
,
7C271 Only)
20
25
30
30
ns
t
ACS
Chip Select Active to Output Valid (CS
1
and CS
2
,
7C271 Only)
20
25
30
30
ns
t
HZOE
Output Enable Inactive to High Z (OE, 7C274
Only)
20
20
25
25
ns
t
OE
Output Enable Active to Output Valid (OE, 7C274
Only)
20
20
25
25
ns
t
HZCE
Chip Enable Inactive to High Z (CE Only)
35
40
50
60
ns
t
ACE
Chip Enable Active to Output Valid (CE Only)
35
40
50
60
ns
t
PU
Chip Enable Active to Power Up
0
0
0
0
ns
t
PD
Chip Enable Inactive to Power Down
35
40
50
60
ns
t
OH
Output Hold from Address Change
0
0
0
0
ns
Note:
6.
See Introduction to CMOS PROMs for general information on testing.
CY7C271
CY7C274
Document #: 38-04008 Rev. *B
Page 4 of 11
Erasure Characteristics
Wavelengths of light less than 4000 angstroms begin to erase
the CY7C271 and CY7C274 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.
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/cm
2
. For an ultraviolet lamp
with a 12 mW/cm
2
power rating, the exposure time would be approx-
imately 35 minutes. The CY7C271 or CY7C274 needs to be within 1
inch of the 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/cm
2
is the recommended maximum dosage.
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.
Switching Waveform
Note:
7.
CS
2
and CS
1
are used on the 7C271 only. OE is used on the 7C274 only.
t
OH
t
PU
t
PD
t
AA
(t
OE
)
t
ACS(E)
50%
50%
A
0
-
A
14
ADDRESS
V
CC
SUPPLY
CURRENT
CS
2
OE, CE, CS
1
O
0
- O
7
PREVIOUS DATA VALID
DATA VALID
POWER-DOWN CONTROLLED BY CE
(t
HZOE
)
t
HZCS(E)
HIGH Z
[7]
Table 1. CY7C271 Mode Selection
Pin Function
[8]
Read or Output Disable
A
14
A
0
CE
CS
2
CS
1
O
7
O
0
Mode
Other
A
14
A
0
VFY
PGM
V
PP
D
7
D
0
Read
A
14
A
0
V
IL
V
IH
V
IL
O
7
O
0
Power Down
A
14
A
0
V
IH
X
X
High Z
Output Disable
A
14
A
0
X
V
IL
X
High Z
Output Disable
A
14
A
0
X
X
V
IH
High Z
Program
A
14
A
0
V
IHP
V
ILP
V
PP
D
7
D
0
Program Verify
A
14
A
0
V
ILP
V
IHP
/V
ILP
V
PP
O
7
O
0
Program Inhibit
A
14
A
0
V
IHP
V
IHP
V
PP
High Z
Blank Check
A
14
A
0
V
ILP
V
IHP
/V
ILP
V
PP
O
7
O
0
CY7C271
CY7C274
Document #: 38-04008 Rev. *B
Page 5 of 11
Table 2. CY7C274 Mode Selection
Pin Function
[8]
Read or Output Disable
A
14
A
0
OE
CE
V
PP
O
7
O
0
Mode
Other
A
14
A
0
VFY
PGM
V
PP
D
7
D
0
Read
A
14
A
0
V
IL
V
IL
Note 9
O
7
O
0
Output Disable
A
14
A
0
V
IH
X
X
High Z
Power Down
A
14
A
0
X
V
IH
X
High Z
Program
A
14
A
0
V
IHP
V
ILP
V
PP
D
7
D
0
Program Verify
A
14
A
0
V
ILP
V
IHP
/V
ILP
V
PP
O
7
O
0
Program Inhibit
A
14
A
0
V
IHP
V
IHP
V
PP
High Z
Blank Check
A
14
A
0
V
ILP
V
IHP
/V
ILP
V
PP
O
7
O
0
Note:
8.
X can be V
IL
(V
ILP
) or V
IH
(V
IHP).
9.
V
PP
should be tied to V
CC
5% in read mode.
Figure 1. Programming Pinouts
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
24
23
22
21
13
14
25
28
27
26
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
D
0
D
1
D
2
GND
V
CC
A
10
A
11
A
12
A
13
A
14
V
PP
PGM
VFY
D
7
D
6
D
4
D
5
D
3
12
D
0
31
4
5
6
7
8
9
10
3 2 1
30
13
14151617
26
25
24
23
22
21
11
A
7
V CC
A
6
A
5
A
4
A
3
A
2
A
1
A
0
PGM
A
14
NC
D
7
D
6
D
4
D
3
D
2
D
1
181920
27
28
29
32
NC
NC
D
5
15
V
PP
7C271
7C271
NC
GND
VFY
A
13
A
12
A
8
A
9
A
10
A
11
DIP
Top View
LCC
Top View
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
24
23
22
21
13
14
25
28
27
26
V
PP
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
D
0
D
1
D
2
GND
V
CC
A
14
A
13
A
8
A
9
A
11
A
10
PGM
VFY
D
7
D
6
D
4
D
5
D
3
12
D
0
31
4
5
6
7
8
9
10
3 2 1
30
13
14151617
26
25
24
23
22
21
11
A
7
V CC
A
6
A
5
A
4
A
3
A
2
A
1
A
0
PGM
A
11
NC
D
7
D
6
D
4
D
3
D
2
D
1
181920
27
28
29
32
NC
NC
D
5
15
7C274
7C274
NC
GND
VFY
A
9
A
8
A
12
A
13
V
PP
A
14
A
10
DIP
Top View
LCC
Top View
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