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PRELIMINARY
CY7C271A
32K x 8 Power Switched and Reprogrammable PROM
Features
* CMOS for optimum speed/power * Windowed for reprogrammability * High speed -- 25 ns (commercial) -- 35 ns (military) * Low power -- 275 mW (commercial) -- 330 mW (military) * Super low standby power -- Less than 85 mW when deselected * EPROM technology 100%programmable * Slim 300-mil package * Direct replacement for bipolar PROMs * Capable of withstanding >4001V static discharge matically powers down into a low-power stand-by mode. The CY7C271A is packaged in the 300-mil slim package and is available in a cerDIP package equipped with an erasure window to provide for reprogrammability. When exposed to UV light, the PROM is erased and can be reprogrammed. The memory cells utilize proven EPROM floating gate technology and byte-wide intelligent programming algorithms. The CY7C271A offers the advantages of lower power, 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 PROM is also tested for AC performance to guarantee that after customer programming, the product will meet DC and AC specification limits. Reading the 7C271A is accomplished by placing active LOW signals on CS1 and CE, and an active HIGH on CS2. 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 CY7C271A is a high-performance 32,768-word by 8-bit CMOS PROM. When disabled (CE HIGH), the 7C271A auto-
Logic Block Diagram
O7
Pin Configurations
DIP/Flatpack
A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 O3 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC A10 A11 A12 A13 A14 CS1 CS2 CE O7 O6 O5 O4 O3 C271A-2
A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Y ADDRESS X ADDRESS 256 x 1024 PROGRAMABLE ARRAY 8 x 1 OF 128 MULTIPLEXER
O6
O5
O4
LCC/PLCC(OpaqueOnly)
4 3 2 1 32 31 30 29 5 28 6 27 7 26 8 25 9 24 10 23 11 22 12 21 13 14151617 181920 O1 O2 GND NC O3 O4 O5 A7 A8 A9 NC V CC A10 A11 A6 A5 A4 A3 A2 A1 A0 NC O0 A12 A13 A14 NC CS1 CS2 CE O7 O6 C271A-3 O2
O1 POWER-DOWN
O0 CE CS1 CS2 C271A-1
Cypress Semiconductor Corporation
*
3901 North First Street
*
San Jose * CA 95134 * 408-943-2600 December 1994 - Revised October 1995
PRELIMINARY
Selection Guide
7C271A-25 Maximum Access Time (ns) Maximum Operating Current (mA) Standby Current (mA) Com'l Military Com'l Military 15 15 25 75 7C271A-30 30 75 7C271A-35 35 50 85 15 25 7C271A-45 45 50 60 15 25
CY7C271A
7C271A-55 55 50 60 15 25
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 ........................................... >4001V (per MIL-STD-883, Method 3015) Latch-Up Current..................................................... >200 mA UV Exposure ................................................ 7258 Wsec/cm 2
Operating Range
Range Commercial Industrial[1] Military
[2]
Ambient Temperature 0C to +70C -40C to +85C -55C to +125C
VCC 5V 10% 5V 10% 5V 10%
Electrical Characteristics Over the Operating Range[3, 4]
7C271A-25 7C271A-30 Parameter VOH VOL VIH VIL IIX IOZ IOS ICC Description Output HIGH Voltage Input HIGH Level Input LOW Level Input Leakage Current Output Leakage Current Output Short Circuit Current[5] Power Supply Current Stand-By Current Test Conditions VCC = Min., IOH = -2.0 mA Min. 2.4 0.4 2.0 VCC 0.8 -10 -10 -20 Com'l Mil Com'l Mil 15 +10 +10 -90 75 -10 -10 -20 2.0 Max. 7C271A-35 Min. 2.4 0.4 VCC 0.8 +10 +10 -90 50 85 15 25 -10 -10 -20 2.0 Max. 7C271A-45 7C271A-55 Min. 2.4 0.4 VCC 0.8 +10 +10 -90 50 60 15 25 mA Max. Unit V V V V A A mA mA
Output LOW Voltage VCC = Min., IOL = 8.0 mA Guaranteed Input Logical HIGH Voltage for All Inputs Guaranteed Input Logical LOW Voltage for All Inputs GND < VIN < VCC GND < VOUT < VCC, Output Disable VCC=Max, VOUT=GND VCC=Max., IOUT=0 mA, f=10 MHz VCC=Max., CE = VIH
ISB
Capacitance[4]
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: 1. Contact a Cypress representative for information on industrial temperature range specifications. 2. TA is the "instant on" case temperature. 3. See the last page of this specification for Group A subgroup testing information. 4. See Introduction to CMOS PROMs in this 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.
2
PRELIMINARY
AC Test Loads and Waveforms
R1 500 658 MIL R1 500 658 MIL
CY7C271A
5V OUTPUT 30 pF INCLUDING JIG AND SCOPE
5V OUTPUT R2 333 403 MIL 5 pF INCLUDING JIG AND SCOPE
3.0V R2 333 GND 403 MIL
ALL INPUT PULSES 90% 10% 90% 10% 5 ns
5 ns
C271A-4 C271A-5
(a) Normal Load
Equivalent to:
(b) High-Z Load
THEVENIN EQUIVALENT 200 2.00VCommercial 250 MIL 1.90VMIL OUTPUT
Switching Characteristics Over the Operating Range[3,4 ]
7C271A-25 Parameter tAA tACS tACE tHZCS tHZCE tPU tPD tOH Description Address to Output Valid CS1/CS2 Active to Output Valid CE Active to Output Valid CS1/CS2 Inactive to High Z CE Inactive to High Z CE Active to Power-Up CE Inactive to Power-Down Output Data Hold 0 0 30 0 Min. Max. 25 12 30 12 12 0 35 0 7C271A-30 Min. Max. 30 18 35 18 18 0 40 0 7C271A-35 Min. Max. 35 18 35 18 18 0 40 0 7C271A-45 Min. Max. 45 18 45 18 18 0 50 7C271A-55 Min. Max. 55 20 55 20 20 Unit ns ns ns ns ns ns ns ns
3
PRELIMINARY
Switching Waveform
ICC tPU CE tPD
CY7C271A
CS2 CS1
ACTIVE
INACTIVE
ACTIVE
A0 - A14
ADDRA tAA tACE tAA
ADDRB tHZCS tOH tACS tHZCE DATA B
C271A-6
O0 - O7
DATA A
DATA B
Erasure Characteristics
Wavelengths of light less than 4000 Angstroms begin to erase the CY7C271A 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/cm2. For an ultraviolet lamp with a 12 mW/cm 2 power rating, the exposure time would be approximately 35 minutes. The CY7C271A needs to Table 1. Programming Electrical Characteristics. Parameter VPP IPP VIHP VILP VCCP Description Programming Power Supply Programming Supply Current Programming Input Voltage HIGH Programming Input Voltage LOW Programming VCC
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/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.
Min. 12.5
Max. 13 50
Unit V mA V V V
3.0 -0.5 6.0
VCC 0.4 6.5
4
PRELIMINARY
Table 2. Mode Selection. Pin Function[6] Mode Read Output Disable Output Disable Stand-by Program Program Verify Program Inhibit Signature (MFG) Signature (DEV)
Notes: 6. X can be VIL or 7. VHV=120.5V
CY7C271A
CS1/VPP VIL VIH VIL X VPP VPP VPP VILP VILP
CS2/PGM VIH VIH VIL X VILP VIHP VIHP VILP VILP
CE/VFY VIL VIL VIL VIH VIHP VILP VIHP VILP VILP
A0 A0 A0 A0 A0 A0 A0 X VILP VIHP
A9 A9 A9 A9 A9 A9 A9 X VHV[7] VHV[7]
Data O7 - O0 High Z High Z High Z D7 - D0 O7 - O0 X 34H 20H
VIH.
Programming Pinouts
DIP/Flatpack
A8 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 GND 2 3 4 5 6 7 8 9 10 11 12 13 14 27 26 25 24 23 22 21 20 19 18 17 16 15 A7 A8 A9 NC VCC A 10 A 11 A6 A5 A4 A3 A2 A1 A0 NC O0 4 3 2 1 32 31 30 29 5 28 6 27 7 26 8 25 9 24 10 23 11 22 12 21 13 14151617 181920 O1 O2 GND NC O3 O4 O5 A12 A13 A14 NC VPP PGM VFY O7 O6 C271A-8 A9 1 28 VCC A10 A11 A12 A13 A14 VPP PGM VFY O7 O6 O5 O4 O3 C271A-7
LCC/PLCC (OpaqueOnly)
5
PRELIMINARY
Typical DC and AC Characteristics
NORMALIZED SUPPLY CURRENT vs. CYCLE PERIOD 1.1 NORMALIZED ICC 1.0 NORMALIZED ICC 0.9 0.8 0.7 0.6 0.5 0.0 50 100 150 200 CLOCK PERIOD (ns) 250 VCC =5.5V TA =25C 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 4 NORMALIZED SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.25 1.2 NORMALIZED ICC 1.15 1.1 1.05 1.0 0.95 0.9 0.85 0.8 -100
CY7C271A
NORMALIZED SUPPLY CURRENT vs. AMBIENT TEMPERATURE VCC =5.5V f = 10 MHz
f = 10 MHz TA =25C
4.5
5
5.5
6
-50
0
50
100
150
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (C)
NORMALIZED ACCESS TIME
1.2 1.15 1.1 1.05 1.0 0.95 0.9 0.85 4 4.5 5 5.5 6 SUPPLYVOLTAGE (V) TA = 25C
NORMALIZED ACCESS TIME
1.25
OUTPUT SINK CURRENT (mA)
NORMALIZED ACCESS TIME vs. SUPPLY VOLTAGE 1.4 1.3 1.2 1.1 1.0 0.9
NORMALIZED ACCESS TIME vs. AMBIENT TEMPERATURE
OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 120 100 80 60 40 20 0 0.0 1.0 2.0 3.0 4.0 VCC =5.0V TA =25C
VCC =4.5V
0.8 -100
-50
0
50
100
150
AMBIENT TEMPERATURE (C)
OUTPUT VOLTAGE (V)
OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE OUTPUT SOURCE CURRENT -100 -80 -60 -40 -20 0.0 0.0 1.0 2.0 3.0 4.0 5.0
OUTPUT VOLTAGE (V)
C271A-9
6
PRELIMINARY
Ordering Information[8]
Speed (ns) 25 30 Ordering Code CY7C271A-25JC CY7C271A-30JC CY7C271A-30PC CY7C271A-30WC 35 CY7C271A-35JC CY7C271A-35PC CY7C271A-35WC CY7C271A-35DMB CY7C271A-35KMB CY7C271A-35LMB CY7C271A-35QMB CY7C271A-35TMB CY7C271A-35WMB 45 CY7C271A-45JC CY7C271A-45PC CY7C271A-45WC CY7C271A-45DMB CY7C271A-45KMB CY7C271A-45LMB CY7C271A-45QMB CY7C271A-45TMB CY7C271A-45WMB 55 CY7C271A-55JC CY7C271A-55PC CY7C271A-55WC CY7C271A-55DMB CY7C271A-55KMB CY7C271A-55LMB CY7C271A-55QMB CY7C271A-55TMB CY7C271A-55WMB Package Name J65 J65 P21 W22 J65 P21 W22 D22 K74 L55 Q55 T74 W22 J65 P21 W22 D22 K74 L55 Q55 T74 W22 J65 P21 W22 D22 K74 L55 Q55 T74 W22 Package Type 32-Lead Plastic Leaded Chip Carrier 32-Lead Plastic Leaded Chip Carrier 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 32-Lead Plastic Leaded Chip Carrier 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) CerDIP 28-Lead Rectangular Cerpack 32-Pin Rectangular Leadless Chip Carrier 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead Windowed Cerpack 28-Lead (300-Mil) Windowed CerDIP 32-Lead Plastic Leaded Chip Carrier 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) CerDIP 28-Lead Rectangular Cerpack 32-Pin Rectangular Leadless Chip Carrier 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead Windowed Cerpack 28-Lead (300-Mil) Windowed CerDIP 32-Lead Plastic Leaded Chip Carrier 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) CerDIP 28-Lead Rectangular Cerpack 32-Pin Rectangular Leadless Chip Carrier 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead Windowed Cerpack 28-Lead (300-Mil) Windowed CerDIP
CY7C271A
Operating Range Commercial Commercial
Commercial
Military
Commercial
Military
Commercial
Military
Notes: 8. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product availability.
7
PRELIMINARY
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 #: 38-00424-A
CY7C271A
Switching Characteristics
Parameter tAA tACS tACE Subgroups 7, 8, 9, 10, 11 7, 8, 9, 10, 11 7, 8, 9, 10, 11
8
PRELIMINARY
Package Diagrams
28-Lead (300-Mil) CerDip D22 MIL-STD-1835 D-15 Config A
CY7C271A
32-Pin Rectangular Leadless Chip Carrier L55 MIL-STD-1835 C-12
28-Lead Rectangular Cerpack K74 MIL-STD-1835 F-11 Config. A
9
PRELIMINARY
Package Diagrams (continued)
28-Lead (300-MIL) Molded DIP P21
CY7C271A
32-Pin Windowed Rectangular Leadless Chip Carrier Q55 MIL-STD-1835 C-12
10
PRELIMINARY
Package Diagrams (continued)
28-Lead Windowed Cerpack T74
CY7C271A
28-Lead (300-MIL) Windowed CerDIP W22 MIL-STD-1835 D-15 Config A
(c) Cypress Semiconductor Corporation, 1995. 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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