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8Kx8 Power-Switched and
Reprogrammable PROM
CY7C266
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
Document #: 38-04005 Rev. *B
Revised December 27, 2002
1CY7C266
Features
CMOS for optimum speed/power
Windowed for reprogrammability
High speed
-- 20 ns (Commercial)
Low power
-- 660 mW (Commercial)
Super low standby power
-- Less than 85 mW when deselected
EPROM technology 100% programmable
5V 10% V
CC
, commercial and military
TTL-compatible I/O
Direct replacement for 27C64 EPROMs
Functional Description
The CY7C266 is a high-performance 8192-word by 8-bit
CMOS PROM. When deselected, the CY7C266 automatically
powers down into a low-power standby mode. It is packaged
in a 600-mil-wide package. The reprogrammable packages
are equipped with an erasure window; when exposed to UV
light, these PROMs are erased and can then be repro-
grammed. The memory cells utilize proven EPROM
floating-gate technology and byte-wide intelligent
programming algorithms.
The CY7C266 is a plug-in replacement for EPROM devices.
The EPROM cell requires only 12.5V for the super voltage 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 performance to guarantee that after customer
programming, the product will meet DC and AC specification
limits.
Reading is accomplished by placing an active LOW signal on
OE and CE. The contents of the memory location addressed
by the address lines (A
0
through A
12
) will become available on
the output lines (O
0
through 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
Top View
CerDIP
V
CC
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
V
CC
NC
A
8
A
9
A
11
OE
A
10
CE
O
7
O
6
O
4
O
5
O
3
A
0
A
1
A
7
A
2
A
3
A
4
A
5
A
6
A
8
A
9
A
10
A
11
A
12
POWER DOWN
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
CE
OE
PROGRAMMABLE
ARRAY
MULTIPLEXER
COLUMN
ADDRESS
12
O
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
CE
A
9
A
11
NC
A
10
O
7
O
6
O
4
GN
D
Top View
LCC
A
8
OE
A
12
V CC
O
3
O
2
O
1
181920
27
28
29
32
NC
NC
NC
O
5
NC
V CC
15
7C266
7C266
ADDRESS
DECODER
ROW
ADDRESS
CY7C266
Document #: 38-04005 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 ................................. 65C to +150C
Ambient Temperature with
Power Applied............................................. 55C to +125C
Supply Voltage to Ground Potential
(Pin 28 to Pin 14) ........................................... 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
7C266-20
7C266-25
7C266-45
Unit
Maximum Access Time
20
25
45
ns
Maximum Operating Current
Commercial
120
120
100
mA
Maximum Standby Current
Commercial
15
15
15
mA
Operating Range
Range
Ambient
Temperature
V
CC
Commercial
0
C to +70
C
5V 10%
Electrical Characteristics
Over the Operating Range
[2]
Parameter
Description
Test Conditions
7C266-20
7C266-25
Unit
Min.
Max.
Min.
Max.
V
OH
Output HIGH Voltage
V
CC
= Min.,
I
OH
=
2.0 mA
Com'l
2.4
2.4
V
2.4
V
OL
Output LOW Voltage
V
CC
= Min., I
OL
= 8.0 mA
Com'l
0.4
0.4
V
V
IH
Input HIGH Voltage
2.0
2.0
V
V
IL
Input LOW Voltage
0.8
0.8
V
I
IX
Input Current
GND < V
IN
< V
CC
10
+10
10
+10
A
V
CD
Input Diode
Clamp Voltage
Note 3
I
OZ
Output Leakage Current
V
OL
< V
OUT
< V
OH
,
Output Disabled
40
+40
40
+40
A
I
OS
Output Short
Circuit Current
[3]
V
CC
= Max., V
OUT
= GND
20
90
20
90
mA
I
CC
Power Supply Current
V
CC
= Max., V
IN
= 2.0V,
I
OUT
= 0 mA
Com'l
120
120
mA
I
SB
Standby Supply Current
Chip Enable Inactive,
CE > V
IH
, I
OUT
= 0 mA
Com'l
15
15
mA
Notes:
1.
The voltage on any input or I/O pin cannot exceed the power pin during power-up.
2.
See the "Introduction to CMOS PROMs" section of the Cypress Data Book for general information on testing.
3.
For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds.
CY7C266
Document #: 38-04005 Rev. *B
Page 3 of 11
Electrical Characteristics
Over the Operating Range
[2]
(continued)
Parameter
Description
Test Conditions
7C266-45
Unit
Min.
Max.
V
OH
Output HIGH Voltage
V
CC
= Min., I
OH
=
4.0 mA
2.4
V
V
OL
Output LOW Voltage
V
CC
= Min., I
OL
= 16.0 mA
0.4
V
V
IH
Input HIGH Voltage
2.0
V
V
IL
Input LOW Voltage
0.8
V
I
IX
Input Current
GND < V
IN
< V
CC
10
+10
mA
V
CD
Input Diode Clamp
Voltage
Note 3
I
OZ
Output Leakage Current
V
OL
< V
OUT
< V
OH
,
Output Disabled
10
+10
mA
I
OS
Output Short
Circuit Current
[3]
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
Com'l
100
mA
I
SB
Standby Supply Current
Chip Enable Inactive,
CE > V
IH
, I
OUT
= 0 mA
Com'l
15
mA
Capacitance
[2]
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
CY7C266
Document #: 38-04005 Rev. *B
Page 4 of 11
AC Test Loads and Waveforms
R2 333
(403
MIL)
3.0V
5V
OUTPUT
R1 500
(658
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) NormalLoad
(b) HighZ Load
OUTPUT
R
TH
200
5V
OUTPUT
5V
OUTPUT
R1250
30pF
INCLUDING
JIG AND
SCOPE
5 pF
INCLUDING
JIG AND
SCOPE
(c) NormalLoad
(d) HighZ Load
OUTPUT
2.0V
R
TH
100
R1 250
R1 500
(658
MIL)
R2 333
(403
MIL)
R2167
R2167
250 MIL
Test Load for -20 through -25 speeds
Test Load for -35 through -45 speeds
Equivalent to:
TH VENIN EQUIVALENT
Equivalent to:
TH VENIN EQUIVALENT
Switching Characteristics
Over the Operating Range
[2]
Parameter
Description
7C266-20
7C266-25
7C266-45
Unit
Min.
Max.
Min.
Max.
Min.
Max.
t
AA
Address to Output Valid
20
25
45
ns
t
HZCE
Chip Enable Inactive to High Z
25
30
45
ns
t
HZOE
Output Enable Inactive to High Z
12
12
20
ns
t
AOE
Output Enable Active to Output Valid
12
12
20
ns
t
ACE
Chip Enable Active to Output Valid
25
30
45
ns
t
OHA
Data Hold from Address Change
3
3
3
ns
t
PU
Chip Enable Active to Power-up
25
30
45
ns
t
PD
Chip Enable Inactive to Power-down
25
30
45
ns
CY7C266
Document #: 38-04005 Rev. *B
Page 5 of 11
Erasure Characteristics
Wavelengths of light less than 4000 angstroms begin to erase
the devices in the windowed package. For this reason, an
opaque label should be placed over the window if the EPROM
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 multiplied by exposure time) of 25 Wsec/cm
2
. For an
ultraviolet lamp with a 12 mW/cm
2
power rating, the exposure time
would be approximately 35 minutes. The CY7C266 needs to be
within 1 inch of the lamp during erasure. Permanent damage may
result if the EPROM is exposed to high-intensity UV light for an
extended period of time.
7258 Wsec/cm2 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.
Table 1. Mode Selection
Mode
Pin Function
[4, 5]
Normal Operation
A
8
A
9
A
10
A
11
A
12
CE
OE
D
7
D
0
Program
VFY
PGM
LAT
NA
NA
CE
V
PP
D
7
D
0
Read
A
8
A
9
A
10
A
11
A
12
V
IL
V
IL
O
7
O
0
Standby
X
X
X
X
X
V
IH
X
Three
-
Stated
Output Disable
A
8
A
9
A
10
A
11
A
12
V
IL
V
IH
Three
-
Stated
Program
V
IHP
V
ILP
V
ILP
V
ILP
V
ILP
V
ILP
V
PP
D
7
D
0
Program Verify
V
ILP
V
IHP
V
ILP
V
ILP
V
ILP
V
ILP
V
PP
O
7
O
0
Program Inhibit
V
IHP
V
IHP
V
ILP
V
ILP
V
ILP
V
ILP
V
PP
Three
-
Stated
Blank Check
V
ILP
V
IHP
V
ILP
V
ILP
V
ILP
V
ILP
V
PP
O
7
O
0
Notes:
4.
X = "don't care" but must not exceed V
CC
+ 5%.
5.
Address A
8
A
12
must be latched through lines A
0
A
4
in Programming modes.
Figure 1. Programming Pinout
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
NC
NA
A
7
A
6
A
5
A
4
/A
12
A
3
/A
11
A
2
/A
10
A
1
/A
9
A
0
/A
8
D
0
D
1
D
2
V
SS
V
PP
NC
NC
VFY
PGM
NA
V
PP
CE
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
12
A
3
/A
11
A
2
/A
1
0
A
1
/A
9
A
0
/A
8
CE
PGM
NA
NC
LAT
D
7
D
6
D
4
VFY
V CC
D
3
D
2
D
1
181920
27
28
29
32
NC
NC
NC
D
5
NC
V CC
15
NA
V
PP
V
SS
LAT
CerDIP
LCC/PLCC
Top View
Top View
7C266
7C266
CY7C266
Document #: 38-04005 Rev. *B
Page 6 of 11
Typical DC and AC Characteristics
TYPICAL ACCESS TIME CHANGE
vs. OUTPUT LOADING
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
NORMA
L
I
Z
E
D
A
CCE
S
S
T
I
ME
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
1.6
1.4
1.2
1.0
0.8
55
125
AMBIENT TEMPERATURE (C)
NORMALIZED ACCESS TIME
vs. TEMPERATURE
150
175
125
75
50
25
0.0
1.0
2.0
3.0
OUT
P
UT
S
I
NK
CURR
E
N
T
(
m
A
)
0
100
OUTPUT VOLTAGE (V)
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
1.0
0.9
0.8
NORMA
L
I
Z
E
D
I
CC
NORM
A
L
IZ
E
D
I
CC
V
CC
= 5.0V
T
A
= 25C
T
A
= 25C
0.6
0.4
60
50
40
30
20
10
0
1.0
2.0
3.0
OUT
P
UT
S
O
U
RCE
CURRE
NT
(m
A
)
OUTPUT VOLTAGE (V)
30
25
20
15
10
5
0
200
400
600
800
DE
L
T
A
t
(
n
s
)
AA
CAPACITANCE (pF)
4.0
1000
V
CC
= 4.5V
T
A
= 25C
T
A
= 25C
f = f
MAX
25
0
OUTPUT SOURCE CURRENT
vs. VOLTAGE
4.0
1.00
1.05
0.95
0.85
0.80
0.75
0
25
50
75
100
0.70
0.90
NORMALIZED SUPPLY CURRENT
vs. CYCLE PERIOD
CYCLE PERIOD (ns)
NORMA
L
I
Z
E
D
I
CC
V
CC
= 5.5V
T
A
= 25C
0
35
NORM
A
L
IZ
E
D
A
CCE
S
S
T
I
M
E
CY7C266
Document #: 38-04005 Rev. *B
Page 7 of 11
Ordering Information
]
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
20
CY7C266
-
20JC
J64
28-Lead Plastic Leaded Chip Carrier
Commercial
CY7C266
-
20WC
W16
28-Lead (600-Mil) Windowed CerDIP
25
CY7C266
-
25JC
J64
28-Lead Plastic Leaded Chip Carrier
Commercial
45
CY7C266
-
45PC
P15
28-Lead (600-Mil) Molded DIP
Commercial
Package Diagrams
28-Lead (600-Mil) CerDIP D16
MIL-STD-1835 D-10 Config. A
51-80019-**
CY7C266
Document #: 38-04005 Rev. *B
Page 8 of 11
Package Diagrams
(continued)
32-Pin Rectangular Leadless Chip Carrier L55
MIL-STD-1835 C-12
51-80068-**
51-85017-*A
28-Lead (600-Mil) Molded DIP P15
CY7C266
Document #: 38-04005 Rev. *B
Page 9 of 11
Package Diagrams
(continued)
MIL-STD-1835 C-12
51-80103-*A
32-Pin Windowed Rectangular Leadless Chip Carrier Q55
CY7C266
Document #: 38-04005 Rev. *B
Page 10 of 11
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.
All product and company names mentioned in this document may be the trademarks of their respective holders.
Package Diagrams
(continued)
28-Lead (600-Mil) Windowed CerDIP W16
MIL-STD-1835 D-10 Config. A
51-80020-**
CY7C266
Document #: 38-04005 Rev. *B
Page 11 of 11
Document History Page
Document Title: CY7C266 8K x 8 Power Switched and Reprogrammable PROM
Document Number: 38-04005
REV.
ECN NO.
Issue
Date
Orig. of
Change
Description of Change
**
113861
03/08/02
DSG
Change from Spec number: 38-00086 to 38-04005
*A
118897
10/09/02
GBI
Update ordering information
*B
122246
12/27/02
RBI
Add power up requirements to Operating Conditions information
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