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1CY 27C2 56
fax id: 3013
CY27C256
32K x 8-Bit CMOS EPROM
Features
* Wide speed range -- 45 ns to 200 ns (commercial and military) * Low power -- 248 mW (commercial) -- 303 mW (military) * Low standby power -- Less than 83 mW when deselected * 10% Power supply tolerance 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 reprogrammed. The memory cells utilize proven EPROM floating gate technology and byte-wide intelligent programming algorithms. The CY27C256 offers the advantage of lower power and superior performance and programming yield. The EPROM cell requires only 12.5V for the super voltage, and low current requirements allow for gang programming. The EPROM cells allow each memory location to be tested 100% because each location is written into, erased, and repeatedly exercised prior to encapsulation. Each EPROM is also tested for AC performance to guarantee that after customer programming, the product will meet both DC and AC specification limits. Reading the CY27C256 is accomplished by placing active LOW signals on OE and CE. The contents of the memory location addressed by the address lines (A0 - A14) will become available on the output lines (O0 - O7).
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-
Logic Block Diagram
A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 POWER-DOWN O1 COLUMN ADDRESS O2 O3 ADDRESS DECODER O4 ROW ADDRESS 256 x 1024 PROGRAMABLE ARRAY 8 x 1 OF 128 MULTIPLEXER O7
Pin Configurations
DIP/Flatpack
O6 VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 GND 1 28 2 27 3 26 4 25 5 24 6 27C256 23 22 7 8 21 9 20 10 19 11 18 12 17 13 16 14 15 VCC A14 A13 A8 A9 A11 OE A10 CE O7 O6 O5 O4 O3 27c256-2
LCC/PLCC[1]
4 3 2 1 32 31 30 29 5 28 27C256 6 27 7 26 8 25 9 24 10 23 11 22 12 21 13 14151617 181920
O5
A6 A5 A4 A3 A2 A1 A0 NC O0
A8 A9 A11 NC OE A10 CE O7 O6
27c256-3
O0 CE 27c256-1
OE
Note: 1. For PLCC only: Pins 1 and 17 are common and tied to the die attach pad. They must therefore be DU (don't use) for the PLCC package.
Cypress Semiconductor Corporation
*
3901 North First Street
*
San Jose
*
CA 95134 * 408-943-2600 May 1993 - Revised August 1994
CY27C256
Selection Guide
27C256-45 27C256-55 Maximum Access Time (ns) Maximum Operating Current (mA) Standby Current (mA) Com'l Mil Com'l Mil 45 45 55 15 20 45 15 55 45 55 15 20 55 20 27C256-70 70 45 55 15 20 70 25 27C256-90 27C256-120 27C256-150 27C256-200 90 45 55 15 20 90 30 120 45 55 15 20 120 30 150 45 55 15 20 150 40 200 45 55 15 20 200 40
Chip Select Time (ns) Output Enable Time (ns)
Pin Configurations
28-Pin TSOP Top View
OE A11 A9 A8 A13 A14 VCC VPP A12 A7 A6 A5 A4 A3
22 23 24 25 26 27 28 1 2 3 4 5 6 7
27C256T
21 20 19 18 17 16 15 14 13 12 11 10 9 8
A10 CE O7 O6 O5 O4 O3 GND O2 O1 O0 A0 A1 A2
27c256-4
32-Pin TSOP T op View OE 1 A19 A8 A 3 A1 NC 4 A1 VCC P VP NC 2 A1 7 A6 A5 A4 A3 A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
27C256
NC A10 CE O7 O6 O5 O4 O3 GND O2 O1 O0 NC A0 A1 A2
27c256-5
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................. -65C to +150C Ambient Temperature with Power Applied............................................. -55C to +125C 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 Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015) Latch-Up Current ..................................................... >200 mA UV Exposure ................................................ 7258 Wsec/cm 2
2
CY27C256
Operating Range
Range Commercial Industrial[2] Military
[3]
Ambient Temperature 0C to +70C -40C to +85C -55C to +125C
VCC 5V 10% 5V 10% 5V 10%
Electrical Characteristics Over the Operating Range[4]
27C256-45, 55, 70, 90, 120, 150, 200 Parameter VOH VOL VIH VIL IIX IOZ IOS ICC Description Output HIGH Voltage Output LOW Voltage Input HIGH Level Input LOW Level Input Current Output Leakage Current Output Short Circuit Current[6] Power Supply Current Test Conditions VCC = Min., IOH = -4.0 mA VCC = Min., IOL = 16.0 mA[5] Guaranteed Input Logical HIGH Voltage for All Inputs Guaranteed Input Logical LOW Voltage for All Inputs GND < VIN < VCC GND < VOUT < VCC, Output Disabled VCC = Max., VOUT = GND VCC = Max., VIN =VIH, IOUT = 0 mA, CE=VIL, OE = VIH VCC = Max., CE = VIH Commercial Military Commercial Military Commercial Military VPP IPP VIHP VILP Programming Supply Voltage Programming Supply Current Input HIGH Programming Voltage Input LOW Programming Voltage 3.0 0.4 12 2.0 -0.3 -10 -10 -40 -20 Min. 2.4 0.4 VCC 0.8 +10 +10 +40 -90 45 55 15 20 13 50 V mA V V mA mA mA Max. Unit V V V V A A
ISB
Standby Supply Current
Capacitance[7]
Parameter CIN COUT Description Input Capacitance Output Capacitance Test Conditions TA = 25C, f = 1 MHz, VCC = 5.0V Max. 10 10 Unit pF 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.
3
CY27C256
AC Test Loads and Waveforms
R1 250 (329 MIL) 5V OUTPUT 30 pF INCLUDING JIG AND SCOPE R2 167 (202 MIL) 5V OUTPUT 5 pF INCLUDING JIG AND SCOPE R2 167 (202 MIL) GND 5 ns R1 250 (329 MIL) 3.0V ALL INPUT PULSES 90% 10% 90% 10% 5 ns
27c256-6 27c256-7
(a) Normal Load
(b) High Z Load
Equivalent to: OUTPUT
THEVENIN EQUIVALENT 100 Commercial 2.00V OUTPUT 125 Military 1.9V
Switching Characteristics Over the Operating Range[4,7 ]
27C256-45 Parameter tAA tHZOE tOE tHZCE tACE tPU tPD tOH Description Address to Output Valid Outpout Enable Inactive to High Z Output Enable Active to Output Valid Chip Enable Inactive to High Z Chip Enable Active to Output Valid Chip Enable Active to Power Up Chip Enable Inactive to Power Down Output Hold from Address Change 0 0 45 0 Min. Max. 45 15 15 20 45 0 55 0 27C256-55 Min. Max. 55 20 20 25 55 0 70 0 27C256-70 Min. Max. 70 25 25 25 70 0 90 27C256-90 Min. Max. 90 25 30 25 90 Unit ns ns ns ns ns ns ns ns
Switching Characteristics Over the Operating Range[4, 7]
27C256-120 Parameter tAA tHZOE tOE tHZCE tACE tPU tPD tOH Description Address to Output Valid Outpout Enable Inactive to High Z Output Enable Active to Output Valid Chip Enable Inactive to High Z Chip Enable Active to Output Valid Chip Enable Active to Power Up Chip Enable Inactive to Power Down Output Hold from Address Change 0 0 120 0 Min. Max. 120 30 30 30 120 0 150 0 27C256-150 Min. Max. 150 30 40 30 150 0 200 27C256-200 Min. Max. 200 30 40 30 200 Unit ns ns ns ns ns ns ns ns
4
CY27C256
Switching Waveform
tPD ICC SUPPLY CURRENT A0 - A14 ADDRESS 50% tPU POWER-DOWN CONTROLLED BY CE 50%
OE, CE tAA tOH O0 - O7 PREVIOUS DATA VALID (tHZOE) tHZCE DATA VALID (tOE) tACE HIGH Z
27c256-8
Erasure Characteristics
Wavelengths of light less than 4000 A begin to erase the 27C256 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 A for a minimum dose (UV intensity multiplied by exposure time) of 25 Wsec/cm2. For an ultraviolet lamp with a 12 mW/cm2 power rating, the exposure time would be approximately 35 minutes. The CY27C256 needs to be Table 1. CY27C256 Mode Selection. Mode A14-A0 Read Output Disable Power Down A14-A0 A14-A0 A14-A0 OE VIL VIH X
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 EPROM Programming Information located at the end of this section. Programming algorithms can be obtained from any Cypress representative.
Pin Function[8] CE VIL VIL VIH VPP X[9] X X O7-O0 O7-O0 High Z High Z
Notes: 8. X can be V IL or V IH 9. VPP should not exceed V CC in read mode.
5
CY27C256
Typical DC and AC Characteristics
NORMALIZED SUPPLYCURRENT vs. SUPPLY VOLTAGE NORMALIZED SUPPLY CURRENT vs. AMBIENT TEMPERATURE 1.3 1.2 1.1 1.0 0.9 TA =25C f = fMAX 4.5 5.0 5.5 6.0 0.8 0.7 -100 -50 0 50 100 150 1.25 1.2 1.15 1.1 1.05 1.0 0.95 0.9 0.85 0.8 4.0 NORMALIZED ACCESS TIME vs. SUPPLY VOLTAGE
1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7
0.6 4.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (C)
SUPPLY VOLTAGE (V)
NORMALIZED ACCESSTIME vs. TEMPERATURE 1.4 1.3 1.2 1.1 1.0 0.9 0.8 -100 -50 0 50 100 150 60 50 40 30 20 10 0 AMBIENT TEMPERATURE (C)
OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE 30.0 25.0 20.0 15.0 10.0 VCC =5V TA =25C 0 1.0 2.0 3.0 4.0 5.0 0.0
TYPICAL ACCESS TIME CHANGE vs. OUTPUT LOADING
VCC =4.5V TA =25C 0 200 400 600 800 1000
OUTPUT VOLTAGE (V)
CAPACITANCE (pF)
OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 175 150 125 100 75 50 25 0 0.0 1.0 2.0 3.0 4.0 VCC =5.0V TA =25C 1.2 1.15 1.1 1.05 1.0 0.95 0.9 0.85 0.8 0.75
NORMALIZED SUPPLYCURRENT vs. ACCESS TIME
VCC =5.6V TA =25C
0
100
200
300
400 500
OUTPUT VOLTAGE(V)
CYCLE TIME(ns)
6
CY27C256
Ordering Information[10]
Speed (ns) 45 Ordering Code CY27C256-45JC CY27C256-45PC CY27C256-45WC CY27C256-45ZC CY27C256-45WMB 55 CY27C256-55JC CY27C256-55PC CY27C256-55WC CY27C256-55ZC CY27C256-55WMB 70 CY27C256-70JC CY27C256-70PC CY27C256-70WC CY27C256-70ZC CY27C256-70WMB 90 CY27C256-90JC CY27C256-90PC CY27C256-90WC CY27C256-90ZC CY27C256-90WMB 120 CY27C256-120JC CY27C256-120PC CY27C256-120WC CY27C256-120ZC CY27C256-120WMB 150 CY27C256-150JC CY27C256-150PC CY27C256-150WC CY27C256-150ZC CY27C256-150WMB 200 CY27C256-200JC CY27C256-200PC CY27C256-200WC CY27C256-200ZC CY27C256-200WMB Package Name J65 P15 W16 Z32 W16 J65 P15 W16 Z32 W16 J65 P15 W16 Z32 W16 J65 P15 W16 Z32 W16 J65 P15 W16 Z32 W16 J65 P15 W16 Z32 W16 J65 P15 W16 Z32 W16 Package Type 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP 32-Pin Rectangular Plastic Leaded Chip Carrier 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 32-Lead Thin Small Outline Package 28-Lead (600-Mil) Windowed CerDIP Military Military Commercial Military Commercial Military Commercial Military Commercial Military Commercial Military Commercial Operating Range Commercial
Notes: 10. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product availability.
7
CY27C256
Ordering Information (continued)
Speed (ns) 45 Ordering Code CY27C256T-45WC CY27C256T-45ZC CY27C256T-45WMB 55 CY27C256T-55WC CY27C256T-55ZC CY27C256T-55WMB 70 CY27C256T-70WC CY27C256T-70ZC CY27C256T-70WMB Package Name W22 Z28 W22 W22 Z28 W22 W22 Z28 W22 Package Type 28-Lead (300-Mil) Windowed CerDIP 28-Thin Small Outline Package 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) Windowed CerDIP 28-Thin Small Outline Package 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) Windowed CerDIP 28-Thin Small Outline Package 28-Lead (300-Mil) Windowed CerDIP Military Military Commercial Military Commercial Operating Range Commercial
MILITARY SPECIFICATIONS Group A Subgroup Testing DC Characteristics
Parameter VOH VOL VIH VIL IIX IOZ ICC ISB Subgroups 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 Document #: 38-00245-D
Switching Characteristics
Parameter tAA tOE tACE Subgroups 7, 8, 9, 10, 11 7, 8, 9, 10, 11 7, 8, 9, 10, 11
8
CY27C256
Package Diagrams
32-Lead Plastic Leaded Chip Carrier J65
28-Lead (600-Mil) Molded DIP P15
9
CY27C256
Package Diagrams (Continued)
28-Lead (600-Mil) Windowed CerDIP W16
MIL-STD-1835 D-10 Config.A
28-Lead Thin Small Outline Package Z28
10
CY27C256
Package Diagrams (Continued)
32-Lead Thin Small Outline Package Z32
(c) Cypress Semiconductor Corporation, 1994. 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.

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