8K x 8 Power-Switched and Reprogrammable PROM
CY7C261
CY7C263/CY7C264
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
Document #: 38-04010 Rev. *B
Revised December 28, 2002
1
Features
CMOS for optimum speed/power
Windowed for reprogrammability
High speed
-- 20 ns (Commercial)
-- 25 ns (Military)
Low power
-- 660 mW (Commercial)
-- 770 mW (Military)
Super low standby power (7C261)
-- Less than 220 mW when deselected
-- Fast access: 20 ns
EPROM technology 100% programmable
Slim 300-mil or standard 600-mil packaging available
5V
10% V
CC
, commercial and military
Capable of withstanding greater than 2001V static
discharge
TTL-compatible I/O
Direct replacement for bipolar PROMs
Functional Description
The CY7C261, CY7C263, and CY7C264 are high-perfor-
mance 8192-word by 8-bit CMOS PROMs. When deselected,
the CY7C261 automatically powers down into a low-power
standby mode. It is packaged in a 300-mil-wide package. The
CY7C263 and CY7C264 are packaged in 300-mil-wide and
600-mil-wide packages respectively, and do not power down
when deselected. The reprogrammable packages are
equipped with an erasure window; when exposed to UV light,
these PROMs are erased and can then be reprogrammed.
The memory cells utilize proven EPROM floating-gate
technology and byte-wide intelligent programming algorithms.
The CY7C261, CY7C263, and CY7C264 are plug-in replace-
ments for bipolar devices and offer the advantages of lower
power, 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 performance to guarantee that after customer
programming the product will meet DC and AC specification
limits.
Read is accomplished by placing an active LOW signal on CS.
The contents of the memory location addressed by the
address line (A
0
-
A
12
) will become available on the output lines
(O
0
-
O
7
).
For an 8K x 8 Registered PROM, see theCY7C265.
Logic Block Diagram
Pin Configurations
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
ADDRESS
DECODER
PROGRAM-
MABLE
ARRAY
COLUMN
MULTI-
PLEXER
POWER DOWN
(7C261)
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
8
A
9
A
10
A
11
A
12
CS
GND
1
2
3
4
5
6
7
8
9
10
11
14
15
16
20
19
18
17
21
24
23
22
Top View
DIP/Flatpack
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
O
2
12
13
O
1
A
12
A
11
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
Top View
18
O
4
O
5
NC
A
0
A
4
A
3
A
10
NC
A
8
A
9
NC
NC
CS
A
11
O
7
O
6
7C261
7C263
7C264
7C261
7C263
A
7
A
2
A
1
A
12
O
2
COLUMN
ADDRESS
ROW
ADDRESS
LCC/PLCC (Opaque Only)
CY7C261
CY7C263/CY7C264
Document #: 38-04010 Rev. *B
Page 2 of 14
Maximum Ratings
[1]
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperatures .................................65
C to+150
C
Ambient Temperature with
Power Applied..............................................55
C to+125
C
Supply Voltage to Ground Potential
(Pin 24 to Pin 12) ............................................ 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
(Pin 19 DIP, Pin 23 LCC) ..............................................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
7C261-20
7C263-20
7C264-20
7C261-25
7C263-25
7C264-25
7C261-35
7C263-35
7C264-35
7C261-45
7C263-45
7C264-45
7C261-55
7C263-55
7C264-55
Unit
Maximum Access Time
20
25
35
45
55
ns
Maximum Operating
Current
Commercial
120
120
100
100
100
mA
Military
140
120
120
120
mA
Maximum Standby
Current (7C261 only)
Commercial
40
40
30
30
30
mA
Military
40
30
30
30
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%
Notes:
1.
The volatge on any input or I/O pin cannot exceed the power pin during
power-up.
2.
T
A
is the "instant on" case temperature.
CY7C261
CY7C263/CY7C264
Document #: 38-04010 Rev. *B
Page 3 of 14
Electrical Characteristics
Over the Operating Range
[3,4]
7C261-20, 25
7C263-20, 25
7C264-20, 25
7C261-35, 45, 55
7C263-35, 45, 55
7C264-35, 45, 55
Parameter
Description
Test Conditions
Min.
Max.
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min., I
OH
= 2.0 mA
2.4
V
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
= 8 mA
(6 mA Mil)
0.4
V
V
OL
Output LOW Voltage
V
CC
= Min., I
OL
= 16 mA
0.4
V
V
IH
Input HIGH Level
2.0
2.0
V
V
IL
Input LOW Level
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 4
Note 4
I
OZ
Output Leakage Current
GND < V
OUT
< V
CC
Output Disabled
Com'l
10
+10
10
+10
A
Mil
40
+40
40
+40
A
I
OS
Output Short Circuit Current
[5]
V
CC
= Max., V
OUT
= GND
20
90
20
90
mA
I
CC
Power Supply Current
V
CC
= Max., f = Max.
I
OUT
= 0 mA
Com'l
120
100
mA
Mil
140
120
I
SB
Standby Supply Current (7C261)
V
CC
= Max.,
CS > V
IH
Com'l
40
30
mA
Mil
40
30
V
PP
Programming Supply Voltage
12
13
12
13
V
I
PP
Programming Supply Current
50
50
mA
V
IHP
Input HIGH Programming Voltage
4.75
4.75
V
V
ILP
Input LOW Programming Voltage
0.4
0.4
V
Capacitance
[4]
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
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.]
CY7C261
CY7C263/CY7C264
Document #: 38-04010 Rev. *B
Page 4 of 14
AC Test Loads and Waveforms
[4]
Switching Characteristics
Over the Operating Range
[1,3,4
]
7C261-20
7C263-20
7C264-20
7C261-25
7C263-25
7C264-25
7C261-35
7C263-35
7C264-35
7C261-45
7C263-45
7C264-45
7C261-55
7C263-55
7C264-55
Parameter
Description
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Unit
t
AA
Address to Output Valid
20
25
35
45
55
ns
t
HZCS1
Chip Select Inactive to High Z
(7C263 and 7C264)
12
12
20
30
35
ns
t
HZCS2
Chip Select Inactive to High Z
(7C261)
20
25
35
45
55
ns
t
ACS1
Chip Select Active to Output Valid
(7C263 and 7C264)
12
12
20
30
35
ns
t
ACS2
Chip Select Active to Output Valid
(7C261)
20
25
35
45
55
ns
t
PU
Chip Select Active to Power-Up
(7C261)
0
0
0
0
0
ns
t
PD
Chip Select Inactive to
Power-Down (7C261)
20
25
35
45
55
ns
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) Normal Load
(b) HighZ Load
OUTPUT
R
TH
200
(250
MIL)
5V
OUTPUT
5V
OUTPUT
R1250
30pF
INCLUDING
JIG AND
SCOPE
5 pF
INCLUDING
JIG AND
SCOPE
(c) Normal Load
(d) High Z Load
OUTPUT
2.0V
R
TH
100
R1 250
R1 500
(658
MIL)
R2 333
(403
MIL)
R2167
R2167
2.0V(1.9VMIL)
Test Load for -20 through -30 speeds
Test Load for -35 through -55 speeds
Equivalent to:
TH VENIN EQUIVALENT
Equivalent to:
TH VENIN EQUIVALENT
CY7C261
CY7C263/CY7C264
Document #: 38-04010 Rev. *B
Page 5 of 14
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 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 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 7C261 or 7C263
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.
Operating Modes
Read
Read is the normal operating mode for programmed device. In
this mode, all signals are normal TTL levels. The PROM is
addressed with a 13-bit field, a chip select, (active LOW), is
applied to the CS pin, and the contents of the addressed location
appear on the data out pins.
Program, Program Inhibit, Program Verify
These modes are entered by placing a high voltage V
PP
on pin
19, with pins 18 and 20 set to V
ILP
. In this state, pin 21 becomes a
latch signal, allowing the upper 5 address bits to be latched into an
onboard register, pin 22 becomes an active LOW program (PGM)
signal and pin 23 becomes an active LOW verify (VFY) signal. Pins
22 and 23 should never be active LOW at the same time. The
PROGRAM mode exists when PGM is LOW, and VFY is HIGH. The
verify mode exists when the reverse is true, PGM HIGH and VFY
LOW and the program inhibit mode is entered with both PGM and
VFY HIGH. Program inhibit is specifically provided to allow data to be
placed on and removed from the data pins without conflict
Switching Waveforms
[4]
t
AA
V
CC
SUPPLY
CURRENT
A
0
- A
12
ADDRESS
CS
t
PU
O
0
- O
7
t
HZCS
t
ACS
50%
50%
t
PD
Table 1. Mode Selection
Pin Function
[6, 7]
Read or Output Disable
A
12
A
11
A
10
A
9
A
8
CS
O
7
O
0
Mode
Program
NA
V
PP
LATCH
PGM
VFY
CS
D
7
D
0
Read
A
12
A
11
A
10
A
9
A
8
V
IL
O
7
O
0
Output Disable
A
12
A
11
A
10
A
9
A
8
V
IH
High Z
Program
V
ILP
V
PP
V
ILP
V
ILP
V
IHP
V
ILP
D
7
D
0
Program Inhibit
V
ILP
V
PP
V
ILP
V
IHP
V
IHP
V
ILP
High Z
Program Verify
V
ILP
V
PP
V
ILP
V
IHP
V
ILP
V
ILP
O
7
O
0
Blank Check
V
ILP
V
PP
V
ILP
V
IHP
V
ILP
V
ILP
O
7
O
0
Notes:
6.
X = "don't care" but not to exceed V
CC
5%.
7.
Addresses A
8
-A
12
must be latched through lines A
0
-A
4
in programming modes.
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