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2K x 8 Reprogrammable PROM
CY7C291A
Cypress Semiconductor Corporation
·
3901 North First Street
·
San Jose
·
CA 95134
·
408-943-2600
Document #: 38-04011 Rev. *A
Revised October 8, 2002
92A
Features
· Windowed for reprogrammability
· CMOS for optimum speed/power
· High speed
-- 20 ns (Commercial)
-- 35 ns (Military)
· Low power
-- 660 mW (Commercial and Military)
· Low standby power
-- 220 mW (Commercial and Military)
· EPROM technology 100% programmable
· Slim 300-mil or standard 600-mil packaging available
· 5V
±
10% V
CC
, commercial and military
· TTL-compatible I/O
· Direct replacement for bipolar PROMs
· Capable of withstanding >2001V static discharge
Functional Description
The CY7C291A is a high-performance 2K-word by 8-bit
CMOS PROM. It is packaged in a 300-mil ceramic package
which may be equipped with an erasure window; when
exposed to UV light the PROM is erased and can then be
reprogrammed. The memory cells utilize proven EPROM
floating-gate technology and byte-wide intelligent
programming algorithms.
The CY7C291A is a plug-in replacement for bipolar devices
and offers the advantage of lower power, reprogrammability,
superior performance and programming yield. The EPROM
cell requires only 12.5V for the supervoltage and low current
requirements allow for gang programming. The EPROM cells
allow for each memory location to be tested 100%, as each
location is written into, erased, and repeatedly exercised prior
to encapsulation. Each PROM is also tested for AC perfor-
mance to guarantee that after customer programming the
product will meet DC and AC specification limits.
A read is accomplished by placing an active LOW signal on
CS
1
, and active HIGH signals on CS
2
and CS
3
. The contents
of the memory location addressed by the address line
(A
0
-
A
10
) will become available on the output lines (O
0
-
O
7
).
Logic Block Diagram
Pin Configurations
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
PROGRAM-
MABLE
ARRAY
MULTI-
PLEXER
GND
1
2
3
4
5
6
7
8
9
10
11
14
15
16
20
19
18
17
21
24
23
22
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
A
7
O
3
V
CC
A
8
A
9
A
10
O
7
O
6
O
5
O
4
CS
1
O
2
12
13
O
1
CS
3
CS
2
28
4
5
6
7
8
9
10
3 2 1
27
1314151617
26
25
24
23
22
21
20
11
12
19
A
5
V CC
GND
A
6
A
7
O
3
O
1
O
0
18
O
4
O
5
NC
A
0
A
4
A
3
A
10
NC
A
8
A
9
NC
NC
CS
1
CS
2
O
7
O
6
A
2
A
1
CS
3
O
2
CS
1
CS
2
CS
3
POWER
DOWN
7C293A
Window available
DIP
LCC/PLCC (Opaque Only)
Top View
Top View
ADDRESS
DECODER
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
8
A
9
A
10
A
7
COLUMN
ADDRESS
ROW
ADDRESS
7C291A
7C291A
CY7C291A
Document #: 38-04011 Rev. *A
Page 2 of 12
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
UV Exposure.................................................7258 Wsec/cm
2
Static Discharge Voltage............................................ >2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current ..................................................... >200 mA
Selection Guide
7C291A-20
7C291A-25
7C291A-35
7C291AL-35
7C291A-50
Unit
Maximum Access Time
20
25
35
50
ns
Maximum
Operating
Current
Standard
Commercial
120
90
90
90
mA
Military
90
mA
L
Commercial
60
mA
Operating Range
Range
Ambient
Temperature
V
CC
Commercial
0
°
C to + 70
°
C
5V
±
10%
Military
[1]
-
55
°
C to + 125
°
C
5V
±
10%
Notes:
1.
T
A
is the "instant on" case temperature.
CY7C291A
Document #: 38-04011 Rev. *A
Page 3 of 12
Electrical Characteristics
Over the Operating Range
[2,3]
7C291A-20
7C291A-25
Parameter
Description
Test Conditions
Min.
Max.
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min., I
OH
=
-
4.0 mA
2.4
2.4
V
V
OL
Output LOW Voltage
V
CC
= Min., I
OL
= 16.0 mA
0.4
0.4
V
V
IH
Input HIGH Voltage
Guaranteed Input Logical
HIGH Voltage for All Inputs
2.0
V
CC
2.0
V
CC
V
V
IL
Input LOW Voltage
Guaranteed Input Logical
LOW Voltage for All Inputs
0.8
0.8
V
I
IX
Input Load Current
GND < V
IN
< V
CC
-
10
+10
-
10
+10
µ
A
V
CD
Input Diode Clamp Voltage
Note 3
I
OZ
Output Leakage Current
GND < V
OUT
< V
CC
,
Output Disabled
-
10
+10
-
10
+10
µ
A
I
OS
Output Short Circuit
Current
[4]
V
CC
= Max., V
OUT
= GND
-
20
-
90
-
20
-
90
mA
I
CC
V
CC
Operating Supply
Current
V
CC
= Max.,
I
OUT
= 0 mA
Com'l
120
90
mA
I
SB
Standby Supply Current
(7C293A Only)
V
CC
= Max.,
CS
1
= V
IH
Com'l
40
30
mA
V
PP
Programming Supply Voltage
12
13
12
13
V
I
PP
Programming Supply Current
50
50
mA
V
IHP
Input HIGH Programming
Voltage
3.0
3.0
V
V
ILP
Input LOW Programming
Voltage
0.4
0.4
V
Notes:
2.
See the last page of this specification for Group A subgroup testing information.
3.
See the "Introduction to CMOS PROMs" section of the Cypress Data Book for general information on testing.
4.
For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds.
CY7C291A
Document #: 38-04011 Rev. *A
Page 4 of 12
Electrical Characteristics
Over the Operating Range
[2,3]
(continued)
7C291AL-35
7C291A-35
7C291A-50
Parameter
Description
Test Conditions
Min.
Max.
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min., I
OH
=
-
4.0 mA
2.4
2.4
V
V
OL
Output LOW Voltage
V
CC
= Min., I
OL
= 16.0 mA
0.4
0.4
V
V
IH
Input HIGH Voltage
Guaranteed Input Logical
HIGH Voltage for All Inputs
2.0
2.0
V
V
IL
Input LOW Voltage
Guaranteed Input Logical
LOW Voltage for All Inputs
0.8
0.8
V
I
IX
Input Load Current
GND < V
IN
< V
CC
-
10
+10
-
10
+10
µ
A
V
CD
Input Diode Clamp Voltage
Note 3
I
OZ
Output Leakage Current
GND < V
OUT
< V
CC
,
Output Disabled
-
10
+10
-
10
+10
µ
A
I
OS
Output Short Circuit Current
[4]
V
CC
= Max., V
OUT
= GND
-
20
-
90
-
20
-
90
mA
I
CC
V
CC
Operating Supply Current
V
CC
= Max.,
V
IN
= 2.0V
I
OUT
= 0 mA
Commercial
60
90
mA
Military
90
I
SB
Standby Supply Current
(7C293A Only)
V
CC
= Max.,
CS
1
= V
IH
Commercial
30
30
mA
Military
40
V
PP
Programming Supply Voltage
12
13
12
13
V
I
PP
Programming Supply Current
50
50
mA
V
IHP
Input HIGH Programming Voltage
3.0
3.0
V
V
ILP
Input LOW Programming Voltage
0.4
0.4
V
Capacitance
[3]
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
CY7C291A
Document #: 38-04011 Rev. *A
Page 5 of 12
AC Test Loads and Waveforms
[3]
t
PU
t
AA
t
HZCS
t
ACS
50%
50%
t
PD
3.0V
5V
OUTPUT
R1250
R2
167
30pF
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) High Z Load
OUTPUT
2.0V
Equivalent to:
THÉ
VENIN EQUIVALENT
100
R1250
R2
167
ALL INPUT PULSES
CS
2
-
CS
3
CS
1
V
CC
SUPPLY
CURRENT
A
0
-
A
10
ADDRESS
O
0
O
7
Switching Characteristics
Over the Operating Range
[2, 3]
7C291A-20
7C291A-25
7C291A-35
7C291AL-35
7C291A-50
Parameter
Description
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Unit
t
AA
Address to Output Valid
20
25
35
50
ns
t
HZCS1
Chip Select Inactive to High Z
15
15
20
20
ns
t
ACS1
Chip Select Active to Output Valid
15
15
20
20
ns
t
HZCS2
Chip Select Inactive to High Z
22
27
35
45
ns
t
ACS2
Chip Select Active to Output Valid
22
27
35
45
ns
t
PU
Chip Select Active to Power-Up
0
0
0
0
ns
t
PD
Chip Select Inactive to Power-Down
22
27
35
45
ns
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