32K x 8-Bit CM OS EPROM
fax id: 3013
CY27C256
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 9 5 1 3 4 • 408- 943-2600
May 1993 – Revised August 1994
1CY27C256
Features
• Wide speed range
—45 ns to 200 ns (commercial and mil itary)
• Low power
—248 mW (commercial)
—303 mW (mili tary)
• Low standby power
—Less than 83 mW when deselected
•±10% Power supply tolerance
Functional Description
The CY27C256 is a high-performance 32,768-word by 8-bit
CMOS EPROM. When disabled (CE HIGH), the CY27C256
automatically powers down into a low-power stand-by mode.
The CY27C256 is packaged in the industry standard 600-mil
DIP, PLCC, and TSOP packages. The CY27C256 is also avail-
able in a CerDIP package equipped with an erasure window
to provide for reprogrammability. When exposed to UV light,
the EPROM is erased and can be repro grammed. The mem-
ory cells utilize proven EPROM floating gate technology and
byte-wide intelligent pro gramming algorithms.
The CY27C256 offers the advantage of lower power and su-
perior perf or mance and progr am ming yield. The EPROM cell
re quires only 12.5V for the super voltage, and low current re-
quirements allow for gang programming. The EPROM cells
allow each memory loc ation to be tested 1 00% because each
location is written into, erased, and repeatedly exercised prior
to encapsulation. Each EPROM is also tested for AC perfor-
mance to guarantee that after customer programming, the
product will meet bot h DC and AC specifi cation limits.
Reading the CY27C256 is accomplished by placing active
LOW signals on OE and CE. The contents of the memory location
addressed by the addr ess lines (A0 - A14) will become available on
the output lines (O0 - O7).
Note:
1. For PLCC only: Pins 1 and 17 are common and tied to the die attac h pad. They must therefore be DU (don’t use) for the PLCC package.
Logic Block Diagram Pin Configurations
27c256–1
A12
A11
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
POWER–DOWN
O7
O6
O5
O4
O3
O2
O1
O0
CE
256 x 1024
PROGRAMABLE
ARRAY 8 x 1 OF 128
MULTIPLEXER
A10
A13
A14
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
12
31
4
5
6
7
8
9
10
32130
1314151617
26
25
24
23
22
21
11
181920
27
28
29
32
15
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
VCC
A13
A8
A9
O7
O6
O4
O5
O3
27c256–2
27c256–3
A9
A11
O7
O6
A8
VPP A14
27C256 A11
OE
A10
CE NC
A5
A4
A3
A2
A6
A1
O0
A0
NC
OE
A10
CE
DIP/Flatpack
27C256
ROW
LCC/PLCC[1]
OE
ADDRESS
COLUMN
ADDRESS
ADDRESS
DECODER
CY27C256
2
Maximum Ratings
(Above which the useful l ife may be impaired. For user guide-
lines, not tested.)
Storage Temperature .... ...................... .. ..... -65°C to +150°C
Ambient Tem per ature with
Power Applied. ......................... ................... -55°C to +125°C
Supply Voltage to Gro und P otential............... .-0.5V to +7.0V
DC Volt ag e A pplied to Outputs
in High Z State... .............................................-0.5V to +7.0V
DC Input Volt age ............................................. -3.0V to +7.0V
DC Program Volta ge .................. ..... ............ ............ .....13.0V
Static Discharge Voltage...........................................>2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current.....................................................>200 mA
UV Exposure......................... .......................7258 Wsec/cm2
Selectio n G uide
27C256-45 27C256-55 27C256-70 27C256-90 27C256-120 27C256-150 27C256-200
Maximum Acc ess T ime (ns) 45 55 70 90 120 150 200
Maximum
Operating
Cur rent (mA)
Com’l 45 45 45 45 45 45 45
Mil 55 55 55 55 55 55 55
Standby Current
(mA) Com’l 15 15 15 15 15 15 15
Mil 20 20 20 20 20 20 20
Chip Select Time (ns) 45 55 70 90 120 150 200
Output Enable Time (ns) 15 20 25 30 30 40 40
Pin Configurations
1
2
3
4
5
6
78
9
10
11
14
19
20
24
23
22 21
25
28
27
26
Top View
28-Pin TSOP
12
13
16
15
17
18
OE
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A10
CE
O7
O6
O5
O4
O3
GND
O2
O0
O1
A0
A6
A5A1
A2
1
2
3
4
5
6
7
8
9
10
11
14 19
20
24
23
22
21
25
28
27
26
Top View
32-Pin TSOP
12
13
29
32
31
30
16
15 17
18
OE
A11
A9
A8
A13
NC
A14
VCC
VPP
NC
A12
A7
A6
A5
NC
A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
NC
O0
A0
A4
A3A1
A2
A4
A3
27c256–4
27c256–5
27C256T
27C256
CY27C256
3
Operating Range
Range Ambient
Temperature VCC
Commercial 0°C to +70°C 5V ±10%
Industrial[2] -40°C to + 85°C 5V ±10%
Military[3] -55°C to +125°C 5V ±10%
Electrical Characteristics Over the Operating Range[4]
27C256 -45, 55, 70, 90,
120, 150, 200
Parameter Description Test Conditions Min. Max. Unit
VOH Output HIGH Voltage VCC = Min., I OH = –4.0 mA 2.4 V
VOL Output LOW Voltage VCC = Min., I OL = 16.0 mA[5] 0.4 V
VIH Input HIGH Level Guaranteed Input Logical HIGH Voltage for All
Inputs 2.0 VCC V
VIL Input LOW Level Guaranteed Input Logical LOW Voltage for All
Inputs –0.3 0.8 V
IIX Input Current GND < VIN < VCC –10 +10 µA
IOZ Output Leakage C urrent GND < VOUT < VCC,
Output Disable d Commercial –10 +10 µA
Military –40 +40
IOS Output Short Circuit Current[6] VCC = Max., V OUT = GND –20 –90 mA
ICC Power Supply Current VCC = Max., VIN =VIH,
IOUT = 0 mA, CE=VIL,
OE = VIH
Commercial 45 mA
Military 55
ISB Standby Supply Cur rent VCC = Max., CE = VIH Commercial 15 mA
Military 20
VPP Programming Su pply Volta ge 12 13 V
IPP Programming Supply Current 50 mA
VIHP Input HIGH Programming
Voltage 3.0 V
VILP Input LOW Programming
Voltage 0.4 V
Capacitance[7]
Parameter Description Test Conditions Max. Unit
CIN Input Capacitance TA = 25°C, f = 1 MHz,
VCC = 5.0V 10 pF
COUT O utput Capacitance 10 pF
Notes:
2. Contact a Cypress representative for information on industrial temperature range specifications.
3. TA is the “instant on” case temperature.
4. See the last page of this specification for Group A subgroup testing information.
5. IOL=12.0 mA for military devices.
6. For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds.
7. See Introduction to CMOS PROMs in this Data Book for general information on testing.
CY27C256
4
AC Test Loads and Waveforms
27c256–6
27c256–7
90%
10%
3.0V
GND
90%
10%
ALL INPUT PULSES
5V
OUTPUT
30 pF
INCLUDING
JIG AN D
SCOPE
5V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
(a) NormalLoad (b) HighZ Load
5ns 5ns
OUTPUT
R1 250Ω(329ΩMIL)
R2 167Ω
(202ΩMIL)
100Ω
Eq uivalent to: THÉ VENIN EQUIVALENT
2.00V
R2 167Ω
(202ΩMIL)
R1 250Ω(329ΩMIL)
OUTPUT 125Ω1.9V
Commercial Military
≤
≤
Switching Characteristics Over the Operating Range[4,7 ]
27C256-45 27C256-
55
27C256-70 27C256-90
Parameter Description Min. Max. Min. Max. Min. Max. Min. Max. Unit
tAA Address to Output Valid 45 55 70 90 ns
tHZOE Outpout Enable Inactive to High Z 15 20 25 25 ns
tOE O utput Enable Active to Output Valid 15 20 25 30 ns
tHZCE Chip Enable Inactive t o High Z 20 25 25 25 ns
tACE Chi p Enable Active to Output Valid 45 55 70 90 ns
tPU Chi p Enable Active to Power Up 0 0 0 0 ns
tPD Chip Enable Inactive to Power Down 45 55 70 90 ns
tOH Output Hold from Address Change 0 0 0 0 ns
Switching Characteristics Over the Operating Range[4, 7 ]
27C256-120 27C256-150 27C256-200
Parameter Description Min. Max. Min. Max. Min. Max. Unit
tAA Address to Output Valid 120 150 200 ns
tHZOE Outpout Enable Inactive to High Z 30 30 30 ns
tOE Output Enable Active to Output Vali d 30 40 40 ns
tHZCE Chip Enable Inactive to High Z 30 30 30 ns
tACE Chip Enable Active to Output Valid 120 150 200 ns
tPU Chip Enable Active to Power Up 0 0 0 ns
tPD Chip Enable Inactive to Power Down 120 150 200 ns
tOH Output H old from Address Change 0 0 0 ns
CY27C256
5
Erasure Chara cteristics
Wavelengths of light less than 4000 Å begin to erase the
27C256 in the windowed package. Fo r th is reason , an opaqu e
label sh ould be placed over the wi ndow if the EPROM is ex-
posed to sunlight or fluorescent lighting for extended periods
of time.
The recommended dose of ultraviolet light for erasure is a
wavelength of 2537 Å for a minimum do se (UV intensity mul-
tiplied by exposure time) of 25 Wsec/cm2. For an ultraviolet
lamp with a 12 mW/cm2 power rating, the exposure t ime would
be approximately 35 minutes. The CY27C256 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 r e com-
mended maximum dosage.
Programming Modes
Programming support is available from Cypress as well as
from a number of third-party software vendors. For detailed
progra mming information, including a listing of software pack-
ages , please s ee the EPROM Programming Information locat-
ed at the end of this section. Programming alg orithms can be
obtained from any Cypress representativ e.
Switching Waveform
tOH
t
PU
tPD
tAA
27c256–8
(tOE)
tACE
50% 50%
A0-A
14
ADDRESS
ICC
SUPPLY
CURRENT
OE,CE
O
0-O
7PREVIOUS DATA VALID DATA VALID
POWER– DOWN CONTROLL ED BY CE
(tHZOE)
tHZCE
HIGH Z
Table 1. CY27C256 Mode Selection.
Mode Pin Function[8]
A14-A0OE CE VPP O7-O0
Read A14-A0VIL VIL X[9] O7-O0
Output Disable A14-A0VIH VIL XHigh Z
Power Down A14-A0X VIH XHigh Z
Notes:
8. X ca n be VIL or VIH
9. VPP should not exceed VCC in read mode.
CY27C256
6
Typical DC and AC Characteristics
1.0
0.8
0.7
4.0 4.5 5.0 5.5 6.0 -100 -50 150
1.2
1.1
1.2
1.1
1.0
0.9
4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
NORMALIZED SUPPLYCURRENT
vs. SUPPLY VOLTAGE NORMALIZED SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
AMBIENT TEMPERATURE (°C) SUPPLY VOLTAGE (V)
NORMALIZED ACCESS TIME
vs. SUPPLY VOLTAGE
0.6
0.9
AMBIENT TEMPERATURE (°C)
NORMALIZED ACCESSTIME
vs. TEMPERATURE
1.0
0.9
0.8
0.8
60
50
40
30
20
10
0 1.0 2.0 3.0
OUTPUT VOLTAGE (V)
30.0
25.0
20.0
15.0
10.0
5.0
0 200 400 600 800
CAPACITANCE (pF )
TYPICAL ACCESS TIME CHANGE
vs. OUTPUT LOADING
4.0 0.0 1000
VCC =4.5V
TA=25°C
TA=25°C
f= f
MAX
0
OUTPUT SOURCE CURRENT
vs. OUTPUT VOLTAGE
1.4
1.2
1.1
1.3
0.7
1.3
050
100
0.85
0.95
1.05
1.15
1.25
-100 -50 150
1.3
1.2
1.1
1.0
0.9
0.8
1.4
050
100
VCC =5V
TA=25°C
1.15
1.05
0.95
0.85
CYCLE TIME(ns)
NORMALIZED SUPPLYCURRENT
vs. ACCESS TIME
0.75
0.8
0.9
1.0
1.1
1.2
0100 200 300 400 500
VCC =5.6V
TA=25°C
150
175
125
75
50
25
0.0 1.0 2.0 3.0
0
100
OUTPUT VOLTAGE(V)
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
VCC =5.0V
TA=25°C
4.0
CY27C256
7
Orde rin g Inf orm a tio n[10]
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
45 CY27C256-45JC J65 32-Pin Rectangular Plastic Leaded Chip Carr ier Commercial
CY27C256-45PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-45WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-45ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-45WMB W16 2 8-Lead (600- Mil) Windowed CerDIP Military
55 CY27C256-55JC J65 32-Pin Rectangular Plastic Leaded Chip Carr ier Commercial
CY27C256-55PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-55WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-55ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-55WMB W16 2 8-Lead (600- Mil) Windowed CerDIP Military
70 CY27C256-70JC J65 32-Pin Rectangular Plastic Leaded Chip Carr ier Commercial
CY27C256-70PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-70WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-70ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-70WMB W16 2 8-Lead (600- Mil) Windowed CerDIP Military
90 CY27C256-90JC J65 32-Pin Rectangular Plastic Leaded Chip Carr ier Commercial
CY27C256-90PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-90WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-90ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-90WMB W16 2 8-Lead (600- Mil) Windowed CerDIP Military
120 CY27C256-120JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier Commercial
CY27C256-120PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-120WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-120ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-120WMB W16 28-Lead (600-Mil) Windowed CerDIP Military
150 CY27C256-150JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier Commercial
CY27C256-150PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-150WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-150ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-150WMB W16 28-Lead (600-Mil) Windowed CerDIP Military
200 CY27C256-200JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier Commercial
CY27C256-200PC P15 28-Lead (600-Mil) Molded DIP
CY27C256-200WC W16 28-Lead (600-Mil) Windowed CerDIP
CY27C256-200ZC Z32 32-L ead Thin Small Outlin e P ackage
CY27C256-200WMB W16 28-Lead (600-Mil) Windowed CerDIP Military
Notes:
10. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product availability.
CY27C256
8
MIL ITARY SPECIFICATIONS
Group A Subgroup Testing
Document #: 38-00245-D
Orde rin g Inf orm a tio n (continued)
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
45 CY27C256T-45WC W22 28-Lead (300-Mil) Windowed CerDIP Commercial
CY27C256T-45ZC Z28 28-Thin Small Outline Packag e
CY27C256T-45WMB W22 28-Lead (300-Mil) Windowed CerDIP Military
55 CY27C256T-55WC W22 28-Lead (300-Mil) Windowed CerDIP Commercial
CY27C256T-55ZC Z28 28-Thin Small Outline Packag e
CY27C256T-55WMB W22 28-Lead (300-Mil) Windowed CerDIP Military
70 CY27C256T-70WC W22 28-Lead (300-Mil) Windowed CerDIP Commercial
CY27C256T-70ZC Z28 28-Thin Small Outline Packag e
CY27C256T-70WMB W22 28-Lead (300-Mil) Windowed CerDIP Military
DC Characteristics
Parameter Subgroups
VOH 1, 2, 3
VOL 1, 2, 3
VIH 1, 2, 3
VIL 1, 2, 3
IIX 1, 2, 3
IOZ 1, 2, 3
ICC 1, 2, 3
ISB 1, 2, 3
Switching Characteristics
Parameter Subgroups
tAA 7, 8, 9, 10, 11
tOE 7, 8, 9, 10, 11
tACE 7, 8, 9, 10, 11
CY27C256
9
Package Diagrams
32-Lead Plastic Leaded Chip Carrier J65
28-Lead (600-Mil) Molded DIP P15
CY27C256
10
Package Diagrams (Continued)
28-Lead (600-Mil) Windowed CerDIP W16
MIL-STD-1835 D-10 Config.A
28-Lead Thin Small Outline Package Z28
CY27C256
© Cypress Semiconductor Corpora t ion, 1994. T h e information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry othe r than circui try embodi ed in a Cypress Semi conductor prod uct. Nor do es it convey or im ply an y li cens e under p atent or other rights . Cypress Semi conductor does not authori ze
its products for use as critical components in life-support systems where a malfunction or failure may re asonably be expected to result in significant injury to the user. The inclu sion of Cypress
Semiconductor products in life-support systems appl ication implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.
Package Diagrams (Continued)
32-Lead Thin Small Outline Package Z32
