Cypress Semiconductor CY7C291A User manual

2K x 8 Reprogrammable PROM
CY7C291A
CY7C292A/CY7C293A
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
March 1986 – Revised May 1993
92A
Features
•Windowed for reprogrammability
•CMOS for optimum speed/power
•High speed
—20 ns (commercial)
—25 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% VCC, 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
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
CS1, and active HIGH signals on CS2and CS3. The contents
of the memory location addressed by the address line (A0−
A10) will become available on the output lines (O0−O7).
LogicBlock Diagram Pin Configurations
C291A-1
C291A-2 C291A-3
O7
O6
O5
O4
O3
O2
O1
O0
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
A6
A5
A4
A3
A2
A1
A0
O0
A7
O3
VCC
A8
A9
A10
O7
O6
O5
O4
CS1
O212 13
O1
CS3
CS2
28
4
5
6
7
8
9
10
321 27
1314151617
26
25
24
23
22
21
20
1112 19
A5
V
CC
GND A6
A7
O3
O1
O018
O4 O5
NC
A0
A4
A3
A10
NC
A8 A9
NC
NC
CS1
CS2
O7
O6
A2
A1CS3
O2
CS1
CS2
CS3
POWER
DOWN
7C293A Window available on
7C291A and 7C293A
only.
DIP LCC/PLCC (Opaque Only)
Top View Top View
ADDRESS
DECODER
A0
A1
A2
A3
A4
A5
A6
A8
A9
A10
A7
COLUMN
ADDRESS
ROW
ADDRESS
7C291A
7C292A
7C293A 7C291A
7C293A

CY7C291A
CY7C292A/CY7C293A
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
UV Exposure.................................................7258 Wsec/cm2
Static Discharge Voltage............................................>2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current.....................................................>200 mA
Selection Guide
7C291A-20
7C292A-20
7C293A-20
7C291A-25
7C292A-25
7C293A-25
7C291AL-25
7C292AL-25
7C293AL-25
7C291A-35
7C292A-35
7C293A-35
7C291AL-35
7C292AL-35
7C293AL-35
7C291A-50
7C292A-50
7C293A-50
7C291AL-50
7C292AL-50
7C293AL-50
Maximum Access Time (ns) 20 25 35 50
Maximum Operating
Current (mA) Standard Commercial 120 90 90 90
Military 120 90 90
LCommercial 60 60 60
Standby Current (mA)
7C293A Only Commercial 40 30 30 30
Military 40 40 40
Operating Range
Range Ambient Temperature VCC
Commercial 0°C to + 70°C 5V ±10%
Industrial[1] −40°C to + 85°C 5V ±10%
Military[2] −55°C to + 125°C 5V ±10%
Notes:
1. Contact a Cypress representative for industrial temperature range spec-
ifications.
2. TAis the “instant on”case temperature.

CY7C291A
CY7C292A/CY7C293A
3
Electrical Characteristics Over the Operating Range[3,4]
7C291A-20
7C292A-20
7C293A-20
7C291A-25
7C292A-25
7C293A-25
7C291AL-25
7C292AL-25
7C293AL-25
Parameter Description Test Conditions Min. Max. Min. Max. Min. Max. Unit
VOH Output HIGH Voltage VCC = Min., IOH = −4.0 mA 2.4 2.4 2.4 V
VOL Output LOW Voltage VCC = Min., IOL = 16.0 mA 0.4 0.4 0.4 V
VIH Input HIGH Voltage Guaranteed Input Logical
HIGH Voltage for All Inputs 2.0 VCC 2.0 VCC 2.0 VCC V
VIL Input LOW Voltage Guaranteed Input Logical
LOW Voltage for All Inputs 0.8 0.8 0.8 V
IIX Input Load Current GND <VIN < VCC −10 +10 −10 +10 −10 +10 µA
VCD Input Diode Clamp Voltage Note 4
IOZ Output Leakage Current GND <VOUT < VCC,
Output Disabled −10 +10 −10 +10 −10 +10 µA
IOS Output Short Circuit
Current[5] VCC = Max., VOUT = GND −20 −90 −20 −90 −20 −90 mA
ICC VCC Operating Supply
Current VCC = Max., IOUT = 0 mA Com’l120 90 60 mA
Mil 120
ISB Standby Supply Current
(7C293A Only) VCC = Max., CS1= VIH Com’l40 30 30 mA
Mil 40
VPP Programming Supply Voltage 12 13 12 13 12 13 V
IPP Programming Supply Current 50 50 50 mA
VIHP Input HIGH Programming
Voltage 3.0 3.0 3.0 V
VILP Input LOW Programming
Voltage 0.4 0.4 0.4 V
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.

CY7C291A
CY7C292A/CY7C293A
4
Electrical Characteristics Over the Operating Range[3,4] (continued)
7C291AL-35, 50
7C292AL-35, 50
7C293AL-35, 50
7C291A-35, 50
7C292A-35, 50
7C293A-35, 50
Parameter Description Test Conditions Min. Max. Min. Max. Unit
VOH Output HIGH Voltage VCC = Min., IOH = −4.0 mA 2.4 2.4 V
VOL Output LOW Voltage VCC = Min., IOL = 16.0 mA 0.4 0.4 V
VIH Input HIGH Voltage Guaranteed Input Logical
HIGH Voltage for All Inputs 2.0 2.0 V
VIL Input LOW Voltage Guaranteed Input Logical
LOW Voltage for All Inputs 0.8 0.8 V
IIX Input Load Current GND <VIN < VCC −10 +10 −10 +10 µA
VCD Input Diode Clamp Voltage Note 4
IOZ Output Leakage Current GND <VOUT < VCC,
Output Disabled −10 +10 −10 +10 µA
IOS Output Short Circuit Current[5] VCC = Max., VOUT = GND −20 −90 −20 −90 mA
ICC VCC Operating Supply Current VCC = Max.,
VIN = 2.0V
IOUT=0 mA
Commercial 60 90 mA
Military 90
ISB Standby Supply Current
(7C293A Only) VCC = Max., CS1=VIH Commercial 30 30 mA
Military 40
VPP Programming Supply Voltage 12 13 12 13 V
IPP Programming Supply Current 50 50 mA
VIHP Input HIGH Programming Voltage 3.0 3.0 V
VILP Input LOW Programming Voltage 0.4 0.4 V
Capacitance[4]
Parameter Description Test Conditions Max. Unit
CIN Input Capacitance TA= 25°C, f = 1 MHz,
VCC = 5.0V 10 pF
COUT Output Capacitance 10 pF

CY7C291A
CY7C292A/CY7C293A
5
AC Test Loads and Waveforms[4]
tPU
tAA tHZCS tACS
50% 50%
tPD
3.0V
5V
OUTPUT
R1250Ω
R2
167Ω
30pF
INCLUDING
JIG AND
SCOPE
GND
90%
10%
90%
10%
<5ns <5ns
5V
OUTPUT
5pF
INCLUDING
JIG AND
SCOPE
(a) NormalLoad (b) HighZ Load
OUTPUT 2.0V
Equivalent to: THÉVENINEQUIVALENT
C291A-4 C291A-5
100ΩC291A-6
R1250Ω
R2
167Ω
ALL INPUT PULSES
CS2−CS3
CS1
VCC
SUPPLY
CURRENT
A0−A10
ADDRESS
O0-O
7
C291A-7
Switching Characteristics Over the Operating Range[3, 4]
7C291A-20
7C292A-20
7C293A-20
7C291A-25
7C292A-25
7C293A-25
7C291AL-25
7C292AL-25
7C293AL-25
7C291A-35
7C292A-35
7C293A-35
7C291AL-35
7C292AL-35
7C293AL-35
7C291A-50
7C292A-50
7C293A-50
7C291AL-50
7C292AL-50
7C293AL-50
Parameter Description Min. Max. Min. Max. Min. Max. Min. Max. Unit
tAA Address to Output Valid 20 25 35 50 ns
tHZCS1 Chip Select Inactive to High Z 15 15 20 20 ns
tACS1 Chip Select Active to Output Valid 15 15 20 20 ns
tHZCS2 Chip Select Inactive to High Z
(7C293A CS1Only)[6] 22 27 35 45 ns
tACS2 Chip Select Active to Output Valid
(7C293A CS1Only)[6] 22 27 35 45 ns
tPU Chip Select Active to Power-Up
(7C293A CS1Only) 0 0 0 0 ns
tPD Chip Select Inactive to Power-Down
(7C293A CS1Only) 22 27 35 45 ns

CY7C291A
CY7C292A/CY7C293A
6
Erasure Characteristics
Wavelengths of light less than 4000 Angstroms begin to erase
these PROMs. 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 inten-
sity x exposure time) of 25 Wsec/cm2. For an ultraviolet lamp
with a 12 mW/cm2power rating, the exposure time would be
approximately 35 minutes.
These PROMs need to be within 1 inch of the lamp during
erasure. Permanent damage may result if the PROM is ex-
posed tohigh-intensity UV light foran extended period of time.
7258 Wsec/cm2is the recommended maximum dosage.
Programming Information
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 pack-
ages, please see the PROM Programming Informationlocated
at the end of this section. Programming algorithms can be ob-
tained from any Cypress representative.
Notes:
6. tHZCS2 and tACS2 refer to 7C293A CS1only.
Switching Characteristics Over the Operating Range[3, 4]
7C291A-20
7C292A-20
7C293A-20
7C291A-25
7C292A-25
7C293A-25
7C291AL-25
7C292AL-25
7C293AL-25
7C291A-35
7C292A-35
7C293A-35
7C291AL-35
7C292AL-35
7C293AL-35
7C291A-50
7C292A-50
7C293A-50
7C291AL-50
7C292AL-50
7C293AL-50
Parameter Description Min. Max. Min. Max. Min. Max. Min. Max. Unit
Table 1. Mode Selection
Pin Function[7]
Read or Output Disable A10 −A0CS3CS2CS1O7−O0
Mode Other A10 −A0PGM VFY VPP D7−D0
Read A10 −A0VIH VIH VIL O7−O0
Output Disable[8] A10 −A0X X VIH High Z
Output Disable A10 −A0X VIL XHigh Z
Output Disable A10 −A0VIL X X High Z
Program A10 −A0VILP VIHP VPP D7−D0
Program Verify A10 −A0VIHP VILP VPP O7−O0
Program Inhibit A10 −A0VIHP VIHP VPP High Z
Intelligent Program A10 −A0VILP VIHP VPP D7−D0
Blank Check Zeros A10 −A0VIHP VILP VPP Zeros
Notes:
7. X = “don’t care”but not to exceed VCC +5%.
8. The power-down mode for the CY7C293A is activated by deselecting CS1.

CY7C291A
CY7C292A/CY7C293A
7
Figure 1. Programming Pinouts
C291A-8 C291A-9
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
24
23
22
21
13
14
A8
A7
A6
A5
A4
A3
A2
A1
A0
D0
D1
D2
GND
VCC
D7
D6
D4
D5
D3
15
A9
A10
VPP
VFY
PGM
28
4
5
6
7
8
9
10
321 27
1314151617
26
25
24
23
22
21
20
1112 19
A5
V
CC
GND A6
A7
D3 D1
D018
D4 D5
NC
A0
A4
A3
A8
NC
NC
D7
D6
A2
A1
D2
A10
VPP
VFY
PGM
NC
A9
DIP LCC/PLCC (Opaque Only)
Top View Top View
7C291A
7C291A
7C292A
7C293A
7C293A
Typical DC and AC Characteristics
1.4
1.6
1.0
0.8
4.0 4.5 5.0 5.5 6.0 −55 25 125
1.2
1.1
1.2
1.0
0.8
0.6
4.0 4.5 5.0 5.5 6.0
NORMALIZED ACCESS TIME
SUPPLY VOLTAGE (V)
NORMALIZED SUPPLY CURRENT
vs. SUPPLY VOLTAGE NORMALIZED SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
AMBIENT TEMPERATURE (°C) SUPPLY VOLTAGE (V)
NORMALIZED ACCESS TIME
vs.SUPPLY VOLTAGE
0.6
1.2 1.0
0.9
0.8
NORMALIZED I
CC
NORMALIZED I
CC
TA=25°C
0.4
TA=25°C
f= f
MAX
C291A-10
1.6
1.4
1.2
1.0
0.8
−55 125
NORMALIZED ACCESS TIME
AMBIENT TEMPERATURE(°C)
NORMALIZED ACCESS TIME
vs.TEMPERATURE
0.6
60
50
40
30
20
10
0 1.0 2.0 3.0
OUTPUT SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)
30.0
25.0
20.0
15.0
10.0
5.0
0 200 400 600 800
DELTA t (ns)
AA
CAPACITANCE (pF)
TYPICAL ACCESS TIME CHANGE
vs.OUTPUT LOADING
4.0 0.0 1000
VCC =4.5V
TA=25°C
25 0
OUTPUT SOURCE CURRENT
vs.VOLTAGE

CY7C291A
CY7C292A/CY7C293A
8
Typical DC and AC Characteristics
150
175
125
75
50
25
0.0 1.0 2.0 3.0
OUTPUT SINK CURRENT (mA)
0
100
OUTPUT VOLTAGE (V)
OUTPUT SINK CURRENT
vs.OUTPUT VOLTAGE
VCC =5.0V
TA=25°C
4.0
C291A-11
1.00
1.02
0.98
0.94
0.92
0.90
025 5075
100
0.88
0.96
ICC vs.CYCLEPERIOD
CYCLEPERIOD (ns)
NORMALIZED I
CC
VCC =5.5V
TA=25°C
Ordering Information[9]
Speed
(ns) ICC (mA) Ordering Code Package Name Package Type Operating Range
20 120 CY7C291A-20JC J64 28-Lead Plastic Leaded Chip Carrier Commercial
CY7C291A-20PC P13 24-Lead (300-Mil) Molded DIP
CY7C291A-20SC S13 24-Lead Molded SOIC
CY7C291A-20WC W14 24-Lead (300-Mil) Windowed CerDIP
25 60 CY7C291AL-25JC J64 28-Lead Plastic Leaded Chip Carrier Commercial
CY7C291AL-25PC P13 24-Lead (300-Mil) Molded DIP
CY7C291AL-25WC W14 24-Lead (300-Mil) Windowed CerDIP
90 CY7C291A-25JC J64 28-Lead Plastic Leaded Chip Carrier
CY7C291A-25PC P13 24-Lead (300-Mil) Molded DIP
CY7C291A-25SC S13 24-Lead Molded SOIC
CY7C291A-25WC W14 24-Lead (300-Mil) Windowed CerDIP
120 CY7C291A-25DMB D14 24-Lead (300-Mil) CerDIP Military
CY7C291A-25LMB L64 28-Square Leadless Chip Carrier
CY7C291A-25QMB Q64 28-Pin Windowed Leadless Chip Carrier
CY7C291A-25TMB T73 24-Lead Windowed Cerpack
CY7C291A-25WMB W14 24-Lead (300-Mil) Windowed CerDIP
30 120 CY7C291A-30DMB D14 24-Lead (300-Mil) CerDIP Military
CY7C291A-30LMB L64 28-Square Leadless Chip Carrier
CY7C291A-30QMB Q64 28-Pin Windowed Leadless Chip Carrier
CY7C291A-30TMB T73 24-Lead Windowed Cerpack
CY7C291A-30WMB W14 24-Lead (300-Mil) Windowed CerDIP
35 60 CY7C291AL-35JC J64 28-Lead Plastic Leaded Chip Carrier Commercial

CY7C291A
CY7C292A/CY7C293A
9
CY7C291AL-35PC P13 24-Lead (300-Mil) Molded DIP
CY7C291AL-35WC W14 24-Lead (300-Mil) Windowed CerDIP
90 CY7C291A-35SC S13 24-Lead Molded SOIC Commercial
CY7C291A-35PC P13 24-Lead (300-Mil) Molded DIP
CY7C291A-35WC W14 24-Lead (300-Mil) Windowed CerDIP
120 CY7C291A-35DMB D14 24-Lead (300-Mil) CerDIP Military
CY7C291A-35LMB L64 28-Square Leadless Chip Carrier
CY7C291A-35QMB Q64 28-Pin Windowed Leadless Chip Carrier
CY7C291A-35TMB T73 24-Lead Windowed Cerpack
CY7C291A-35WMB W14 24-Lead (300-Mil) Windowed CerDIP
Notes:
9. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product
availability.
Ordering Information[9] (Continued)
Speed
(ns) ICC (mA) Ordering Code Package Name Package Type Operating Range

CY7C291A
CY7C292A/CY7C293A
10
50 60 CY7C291AL-50JC J64 28-Lead Plastic Leaded Chip Carrier Commercial
CY7C291AL-50PC P13 24-Lead (300-Mil) Molded DIP
CY7C291AL-50WC W14 24-Lead (300-Mil) Windowed CerDIP
90 CY7C291A-50SC S13 24-Lead Molded SOIC Commercial
CY7C291A-50PC P13 24-Lead (300-Mil) Molded DIP
CY7C291A-50WC W14 24-Lead (300-Mil) Windowed CerDIP
90 CY7C291A-50DMB D14 24-Lead (300-Mil) CerDIP Military
CY7C291A-50LMB L64 28-Square Leadless Chip Carrier
CY7C291A-50QMB Q64 28-Pin Windowed Leadless Chip Carrier
CY7C291A-50TMB T73 24-Lead Windowed Cerpack
CY7C291A-50WMB W14 24-Lead (300-Mil) Windowed CerDIP
20 120 CY7C292A-20DC D12 24-Lead (600-Mil) CerDIP Commercial
CY7C292A-20PC P11 24-Lead (600-Mil) Molded DIP
25 120 CY7C292A-25DC D12 24-Lead (600-Mil) CerDIP Commercial
CY7C292A-25PC P11 24-Lead (600-Mil) Molded DIP
CY7C292A-25DMB D12 24-Lead (600-Mil) CerDIP Military
30 120 CY7C292A-30DMB D12 24-Lead (600-Mil) CerDIP Military
35 60 CY7C292AL-35PC P11 24-Lead (600-Mil) Molded DIP Commercial
90 CY7C292A-35DC D12 24-Lead (600-Mil) CerDIP Commercial
CY7C292A-35PC P11 24-Lead (600-Mil) Molded DIP
120 CY7C292A-35DMB D12 24-Lead (600-Mil) CerDIP Military
50 60 CY7C292AL-50PC P11 24-Lead (600-Mil) Molded DIP Commercial
90 CY7C292A-50DC D12 24-Lead (600-Mil) CerDIP Commercial
CY7C292A-50PC P11 24-Lead (600-Mil) Molded DIP
120 CY7C292A-50DMB D12 24-Lead (600-Mil) CerDIP Military
20 120 CY7C293A-20PC P13 24-Lead (300-Mil) Molded DIP Commercial
CY7C293A-20WC W14 24-Lead (300-Mil) Windowed CerDIP
25 120 CY7C293A-25PC P13 24-Lead (300-Mil) Molded DIP Commercial
CY7C293A-25WC W14 24-Lead (300-Mil) Windowed CerDIP
CY7C293A-25DMB D14 24-Lead (300-Mil) CerDIP Military
CY7C293A-25LMB L64 28-Square Leadless Chip Carrier
CY7C293A-25QMB Q64 28-Pin Windowed Leadless Chip Carrier
CY7C293A-25WMB W14 24-Lead (300-Mil) Windowed CerDIP
Ordering Information[9] (Continued)
Speed
(ns) ICC (mA) Ordering Code Package Name Package Type Operating Range