1CY 7C29 2A
CY7C291A
CY7C292A/CY7C293A
2K x 8 Reprogrammable PROM
Features
•
Windowed for reprogrammability
•
CMOS for optimum speed/power
•
High speed
—
20 ns (commercial)
—
25 ns (military)
•
Low power
identical, but are packaged in 300-mil (7C291A, 7C293A) and
600-mil wide plastic and hermetic DIP packages (7C292A).
The CY7C293A has an automatic power down feature which
reduces the power consumption by over 70% when deselect-
ed. The 300-mil ceramic package may be equipped with an
erasure window; when exposed to UV light the PROM is
erased and can then be reprogrammed. The memory cells uti-
lize proven EPROM floating-gate technology and byte-wide in-
telligent programming algorithms.
The CY7C291A, CY7C292A, and CY7C293A are plug-in re-
placements for bipolar devices and offer the advantages 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 loca-
tion to be tested 100%, as each location is written into, erased,
and repeatedly exercised prior to encapsulation. Each PROM
is also tested for AC performance to guarantee that after cus-
tomer programming the product will meet DC and AC specifi-
cation 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
).
—
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, CY7C292A, and CY7C293A are high-perfor-
mance 2K-word by 8-bit CMOS PROMs. They are functionally
Logic Block Diagram
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
O
3
A
8
A
9
A
10
COLUMN
ADDRESS
POWER
DOWN
7C293A
O
2
O
1
ADDRESS
DECODER
O
4
ROW
ADDRESS
PROGRAM-
MABLE
ARRAY
MULTI-
PLEXER
O
6
O
7
Pin Configurations
DIP
Top View
A
7
A
6
O
5
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
GND
1
24
2
23
3 7C291A 22
4 7C292A 21
7C293A
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
V
CC
A
8
A
9
A
10
CS
1
CS
2
CS
3
O
7
O
6
O
5
O
4
O
3
C291A-3
C291A-2
O
0
4 3 2 1 28 27 26
25
5
24
6
7C291A
23
7
22
8
21
9
7C293A
20
10
19
11
12 1314151617 18
A
10
CS
1
CS
2
CS
3
NC
O
7
O
6
LCC/PLCC (Opaque Only)
Top View
A
4
A
3
A
2
A
1
A
0
NC
O
0
CS
1
CS
2
CS
3
Window available on
7C291A and 7C293A
only.
C291A-1
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134 •
408-943-2600
March 1986 – Revised May 1993
CY7C291A
CY7C292A/CY7C293A
Selection Guide
7C291A-25
7C292A-25
7C293A-25
7C291AL-25
7C292AL-25
7C293AL-25
25
90
120
60
40
30
40
7C291A-35
7C292A-35
7C293A-35
7C291AL-35
7C292AL-35
7C293AL-35
35
90
90
60
30
40
7C291A-50
7C292A-50
7C293A-50
7C291AL-50
7C292AL-50
7C293AL-50
50
90
90
60
30
40
7C291A-20
7C292A-20
7C293A-20
Maximum Access Time (ns)
Maximum Operating
Current (mA)
Standard
Commercial
Military
L
Standby Current (mA)
7C293A Only
Commercial
Commercial
Military
20
120
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
Operating Range
Range
Commercial
Industrial
[1]
Military
[2]
Ambient
Temperature
0
°
C to + 70
°
C
−40
°
C to + 85
°
C
−55
°
C to + 125
°
C
V
CC
5V
±10%
5V
±10%
5V
±10%
Notes:
1. Contact a Cypress representative for industrial temperature range spec-
ifications.
2. T
A
is the “instant on” case temperature.
2
CY7C291A
CY7C292A/CY7C293A
Electrical Characteristics
Over the Operating Range
[3,4]
7C291A-20
7C292A-20
7C293A-20
Parameter
V
OH
V
OL
V
IH
V
IL
I
IX
V
CD
I
OZ
I
OS
I
CC
Description
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Input Load Current
Input Diode Clamp Voltage
Output Leakage Current
Output Short Circuit
Current
[5]
V
CC
Operating Supply
Current
Standby Supply Current
(7C293A Only)
Programming Supply Voltage
Programming Supply Current
Input HIGH Programming
Voltage
Input LOW Programming
Voltage
3.0
0.4
GND < V
OUT
< V
CC
,
Output Disabled
V
CC
= Max., V
OUT
= GND
V
CC
= Max.,
I
OUT
= 0 mA
V
CC
= Max.,
CS
1
= V
IH
Com’l
Mil
Com’l
Mil
12
13
50
3.0
0.4
12
40
−10
−20
+10
−90
120
−10
−20
Test Conditions
V
CC
= Min., I
OH
=
−4.0
mA
V
CC
= Min., I
OL
= 16.0 mA
Guaranteed Input Logical
HIGH Voltage for All Inputs
Guaranteed Input Logical
LOW Voltage for All Inputs
GND < V
IN
< V
CC
−10
2.0
Min.
2.4
0.4
V
CC
0.8
+10
−10
2.0
Max.
7C291A-25
7C292A-25
7C293A-25
Min.
2.4
0.4
V
CC
0.8
+10
Note 4
+10
−90
90
120
30
40
13
50
3.0
0.4
12
13
50
V
mA
V
V
30
mA
−10
−20
+10
−90
60
µA
mA
mA
−10
2.0
Max.
7C291AL-25
7C292AL-25
7C293AL-25
Min.
2.4
0.4
V
CC
0.8
+10
Max.
Unit
V
V
V
V
µA
I
SB
V
PP
I
PP
V
IHP
V
ILP
Notes:
3. See the last page of this specification for Group A subgroup testing information.
4. See the “Introduction to CMOS PROMs” section of the Cypress Data Book for general information on testing.
5. For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds.
3
CY7C291A
CY7C292A/CY7C293A
Electrical Characteristics
Over the Operating Range
[3,4]
(continued)
7C291AL-35, 50
7C292AL-35, 50
7C293AL-35, 50
Parameter
V
OH
V
OL
V
IH
V
IL
I
IX
V
CD
I
OZ
I
OS
I
CC
Description
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Input Load Current
Input Diode Clamp Voltage
Output Leakage Current
Output Short Circuit Current
[5]
V
CC
Operating Supply Current
GND < V
OUT
< V
CC
,
Output Disabled
V
CC
= Max., V
OUT
= GND
V
CC
= Max.,
V
IN
= 2.0V
I
OUT
=0 mA
V
CC
= Max.,
CS
1
=V
IH
Commercial
Military
Commercial
Military
12
13
50
3.0
0.4
3.0
0.4
12
30
−10
−20
Test Conditions
V
CC
= Min., I
OH
=
−4.0
mA
V
CC
= Min., I
OL
= 16.0 mA
Guaranteed Input Logical
HIGH Voltage for All Inputs
Guaranteed Input Logical
LOW Voltage for All Inputs
GND < V
IN
< V
CC
−10
2.0
0.8
+10
Note 4
+10
−90
60
−10
−20
+10
−90
90
90
30
40
13
50
V
mA
V
V
mA
µA
mA
mA
−10
Min.
2.4
0.4
2.0
0.8
+10
Max.
7C291A-35, 50
7C292A-35, 50
7C293A-35, 50
Min.
2.4
0.4
Max.
Unit
V
V
V
V
µA
I
SB
Standby Supply Current
(7C293A Only)
Programming Supply Voltage
Programming Supply Current
Input HIGH Programming Voltage
Input LOW Programming Voltage
V
PP
I
PP
V
IHP
V
ILP
Capacitance
[4]
Parameter
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
T
A
= 25°C, f = 1 MHz,
V
CC
= 5.0V
Max.
10
10
Unit
pF
pF
4
CY7C291A
CY7C292A/CY7C293A
AC Test Loads and Waveforms
[4]
5V
OUTPUT
30pF
INCLUDING
JIG AND
SCOPE
R2
167Ω
R1250
Ω
5V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
R2
167Ω
R1250
Ω
3.0V
GND
< 5 ns
C291A-4
ALL INPUT PULSES
90%
10%
90%
10%
< 5 ns
C291A-5
(a) Normal Load
Equivalent to:
THÉ
VENIN EQUIVALENT
100Ω
OUTPUT
(b) High Z Load
2.0V
C291A-6
V
CC
SUPPLY
CURRENT
A
0
−
A
10
ADDRESS
CS
2
−
CS
3
CS
1
t
AA
O
0
- O
7
t
PD
50%
t
PU
50%
t
HZCS
t
ACS
C291A-7
Switching Characteristics
Over the Operating Range
[3, 4]
7C291A-25
7C292A-25
7C293A-25
7C291AL-25
7C292AL-25
7C293AL-25
Min.
Max.
25
15
15
27
27
0
22
27
0
35
7C291A-35
7C292A-35
7C293A-35
7C291AL-35
7C292AL-35
7C293AL-35
Min.
Max.
35
20
20
35
35
0
45
7C291A-50
7C292A-50
7C293A-50
7C291AL-50
7C292AL-50
7C293AL-50
Min.
Max.
50
20
20
45
45
Unit
ns
ns
ns
ns
ns
ns
ns
7C291A-20
7C292A-20
7C293A-20
Parameter
t
AA
t
HZCS1
t
ACS1
t
HZCS2
t
ACS2
t
PU
t
PD
Description
Address to Output Valid
Chip Select Inactive to High Z
Chip Select Active to Output Valid
Chip Select Inactive to High Z
(7C293A CS
1
Only)
[6]
Chip Select Active to Output Valid
(7C293A CS
1
Only)
[6]
Chip Select Active to Power-Up
(7C293A CS
1
Only)
Chip Select Inactive to Power-Down
(7C293A CS
1
Only)
0
Min.
Max.
20
15
15
22
22
Notes:
6. t
HZCS2
and t
ACS2
refer to 7C293A CS
1
only.
5
电源技术
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
