Features CMOS for optimum speed/power Windowed for reprogrammability e High speed 25 ns (commercial) 35 ns (military) Low power ~ 275 mW (commercial) 330 mW (military) e Super low standby power Less than 85 mW when deselected e EPROM technology 100% programmable Slim 300-mil package Direct replacement for bipolar PROMs f CYPRESS PRELIMINARY CY7C271A 32K x 8 Power-Switched and Reprogrammable PROM Capable of withstanding >4001V Static discharge Functional Description The CY7C271A is a high-performance 32,768-word by 8-bit CMOS PROM. When disabled (CE HIGH), the 7C271A automatically 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 re- programmability. When exposed to UV light, the PROM is erased and can be re- programmed, The memory cells utilize proven EPROM floating gate technology and byte-wide intelligent programming al- gorithms. The CY7C271A offers the advantages of lower power, superior performance, and programming yield. The EPROM cell re- quires only 12.5V for the super voltage, and low current requirements allow for gang programming. The EPROM cells al- low 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 guar- antce that after customer programming, the product will meet DC and AC specifi- cation limits. Reading the 7C271A is accomplished by placing active LOW signals on CS, and , and an active HIGH on CS2. The contents of the memory location ad- dressed by the address lines (Ag Ay4) will become available on the output lines (Og O7). Logic Block Diagram 256 x 1024 x PROGRAMABLE ADORESS ARRAY Y ADORESS cs, CS, POWER-DOWN o7 O% Og Ca71A-1 Pin Configurations DIP/Flatpack C271A-2 PPP Ag Ag AY NC Oo C271A-3 Selection Guide Current (mA) urrent 4-148PRELIMINARY CY7C271A J CYPRESS Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature 65C to +150C bce c eee uetntveveeeeenenes >200 mA 7258 Wsec/em? Latch-Up Current UV Exposure Ambient Temperature with Operating Range Power Applied ..........0..0....0008- ~ 55C to +125C Ambient Supply Voltage to Ground Potential ........ -0.5V to +7.0V Range Temperature Yee DC Voltage Applied to Outputs Commercial OC to +70C SV +10% in High Z State ...... 2... eee 0.5V to +7.0V Industrial?! =40C to +85C 5V +10% DC Input Voltage ........0000.0...00040- 3.0V to +7.0V Militaryll 55C to 4 125C SV +10% DC Program Voltage o...0 000000. 13.0V Static Discharge Voltage ...........0...0..0..0.00. >4001V (per MIL-STD-883, Method 3015) Electrical Characteristics Over the Operating Rangel? 4] 7C271A25 TC2TLA45 7C271A30 IC2TIA-35 7IC27TLA55 Parameter Description Test Conditions Min. Max. | Min. Max. | Min. Max. | Unit Vou Output HIGH Vcc = Min. lon = 2.0mA | 2.4 2.4 2.4 v Voltage VoL Output LOW Voltage Vcc = Min., lop = 8.0mA 0.4 0.4 0.4 Vv Vin Input HIGH Level Guaranteed Input Logical 2.0 Vee 2.0 Vee 2.0 Vcc Vv HIGH Voltage for All Inputs Vit Input LOW Level Guaranteed Input Logical 0.8 0.8 0.8 Vv LOW Voltage for All Inputs Ix Input Leakage GND < Vin Vcc ~10 +10 -10 +10 -10 +10 pA Current loz Output Leakage GND < Vout Vcc, 10 +10 ~10 +10 ~-10 +10 pA Current Output Disable los Output Short Circuit | Vec=Max, VOour=GND 20 90 20 90 -20 -90 mA Current? Icc Power Supply Current | Vcoc=Max., Com't 75 50 50 mA Toutr=0 mA, f=10 MHz Mil 85 60 mA isp Stand-By Current Voc=Max., Com! 15 [5 15 mA CE = Vin - Mil 25 25 mA Capacitancel] Parameter Description Test Conditions Max. Unit Cin Input Capacitance Ta = 25C, f = 1 MHz, 10 pF Cout Output Capacitance Voc = 5.0V 10 pF Notes: |. Contact a Cypress representative for information on industrial tem- perature range specifications. 2. Ta is the instant on case temperature. 3. See the last page of this specification for Group A subgroup testing in- formation. 4. See Introduction to CMOS PROMs in this Data Book for general in- formation 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. 4-149PRELIMINARY CY7C271A CYPRESS AC Test Loads and Waveforms R1 500Q Ri 5009 65822 MIL 658Q MIL ALL INPUT PULSES 5V sv Ooo 3.04 OUTPUT o OUTPUT oT Yt R2 3332 y R2 3332 GND > 30 pF F000 MIL 5 pF T 5 40322 MIL INCLUDING L INCLUDING == = JIG AND JIG AND SCOPE SCOPE Ca7ia-4 (a) Normal Load (b) High-Z Load C271A-5 L <5ns tH [pnrar Equivalent to: THEVENIN EQUIVALENT 200Q : 2,00V Commercial OUTPUT oto 1.90V MIL Switching Characteristics Over the Operating Rangel? 4] TC2Z7T1A25 7C271A30 TC2T1IA35 7C271A45 TC2T1AS5 Parameter Description Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Unit taAA Address to Output Valid 25 30 35 45 55 ns tacs CS |/CS2 Active to 12 15 15 15 20 ns Output Valid tacE CE Active to Output 30 35 35 45 55 ns Valid tHzcs CS/CS2 Inactive to 12 15 15 15 20 ns High Z tHZCE CE Inactive to High Z 12 15 15 15 20 ns tpu CE Active to Power-Up 0 0 0 0 0 ns tpp CE Inactive to Power- 30 35 40 40 50 ns Down tou Output Data Hold 0 0 0 0 0 ns Switching Waveform lec / tpy tep ce \ / cs 2 ACTIVE xK INACTIVE K ACTIVE cs, Ao - Ata X ADDR A ADDR B taa taa tuzcs tacs le tac >| ton tHzce 0-0, + K DATA A DATA B DATAB C271A-6 4-150J CYPRESS PRELIMINARY CY7C271A Erasure Characteristics Wavelengths of light less than 4000 A 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 wave- length of 2537 A for a minimum dose (UV intensity multiplied by exposure time) of 25 Wsec/cm?. For an ultraviolet lamp with a 12 mW/cm? power rating, the exposure time would be approximately 35 minutes. The CY7C271A needs to be within 1 inch of the lamp during erasure. Permanent damage may result if the PROM is ex- posed to high-intensity UV light for an extended period of time. 7258 Wsec/cm? 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 program- ming 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. Programming Electrical Characteristics Parameter Description Min. Max. Unit Vpp Programming Power Supply 12.5 13 Vv Ipp Programming Supply Current 50 mA Vine Programming Input Voltage HIGH 3.0 Vec Vv Vitp Programming Input Voltage LOW ~-0.5 0.4 Vv Vocp Programming Vcc 6.0 6.5 Vv Table 2. Mode Selection Pin Function'! Mode CS\/Vpp | CS/PGM | CE Ap Ag Data Read Vib Vin Vit Ao Ag O07 - Oy Output Disable Vin Vin VIL Ag Ag High Z Output Disable Vit Vit Vit Ag Ag High Z Stand-by Xx x Vin Ag Ag High Z Program Vpp VILP VIHP Ay Ag D7 - Do Program Verify Vpp VinP ViLP Ag Ao 07 - Oo Program Inhibit Vpp Vine Vine xX x xX Signature (MFG) VILP Viep Vite Vitp Vivi 34H Signature (DEV) Vite VILP Vitp Vine Vuavll 20H Notes: 6. Xcanbe Vip or Vyy. 7. Vuavei2+0.5V Programming Pinouts DIP/Flatpack LCC/PLCC (Opaque Only) noay 82r aqatqeradc Ae As As Ag Ag Ay Ag NC Oo 6 2 & C271A-8 4-1517 PRELIMINARY CY7C271A J CYPRESS Typical DC and AC Characteristics NORMALIZED SUPPLY CURRENT vs. CYCLE PERIOD 1.0 8 0.9 i 5 oa a . = G 07 z 0.6 0 0.0 50 100 150 200 250 CLOCK PERIOD (ns) NORMALIZED ACCESS TIME vs. SUPPLY VOLTAGE 1.25 1.2 0.95 NORMALIZED ACCESS TIME 5 on 09 0.85 4 45 5 5.5 6 SUPPLY VOLTAGE (V) NORMALIZED SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.7 1. 1.5 1. 21 a bar ee $1 & 0 zo 0. 0. 0. 4 4.5 5 5.5 6 SUPPLY VOLTAGE (V) NORMALIZED ACCESS TIME ys. AMBIENT TEMPERATURE w 14 2 = 13 i ' Voc = 4.5V 8 2 < oo 5 $ 1.0 x oO O09 2 0. -100 -50 0 50 100 150 AMBIENT TEMPERATURE (C) OUTPUT SOURCE CURRENT ys, OUTPUT VOLTAGE -100 i Zz c = -80 =} oO tw 60 2 N 3 GH 40 NJ 2 5 -20 NN o 0.0 0.0 61.0 2.0 30 40 50 OUTPUT VOLTAGE (V) 4-152 OUTPUT SINK CURRENT (mA) OUTPUT SOURCE CURRENT ys. OUTPUT VOLTAGE Voc = 5.5V f = 10 MHz < 1.0 {5 0.95 = o9 0.85 -100 ~50 0 50 100 150 AMBIENT TEMPERATURE (C) OUTPUT SINK CURRENT vs, OUTPUT VOLTAGE 120 100 80 60 40 20 0 0.0 1.0 OUTPUT VOLTAGE (V) 2.0 3.0 4.0CYPRESS PRELIMINARY CY7C271A Ordering Informationt|*! Speed Package Operating (ns) Ordering Code Name Package Type Range 25 CY7TC271A255C J65 32-Lead Plastic Leaded Chip Carrier Commercial 30 CY7C271A-30IC J65 32-Lead Plastic Leaded Chip Carrier Commercial CY7C271A30PC P21 28-Lead (300-Mil) Molded DIP CY7C2TIA-30WC W22 28-Lead (300-Mil) Windowed CerDIP 35 CY7TC2TIA~35IC J65 32-Lead Plastic Leaded Chip Carrier Commercial CY7C2TIA35PC P21 28-Lead (300-Mil) Molded DIP CYTCITIA-35WC W22 28-Lead (300-Mil) Windowed CerDIP CY7C271A-35DMB D22 28-Lead (300-Mil) CerDIP Military CY7C271A-35KMB K74 28-Lead Rectangular Cerpack CY7C271A-35LMB L55 32-Pin Rectangular Leadless Chip Carrier CY7C271A35QMB Q55 32-Pin Windowed Rectangular Leadiess Chip Carrier CY7C271A-35TMB 774 28-Lead Windowed Cerpack CY7C271A-35WMB W22 28-Lead (300-Mil) Windowed CerDIP 45 CY7C271A~455C J65 32-Lead Plastic Leaded Chip Carrier Commercial CY7C27T1IA45PC P21 28-Lead (300-Mil) Molded DIP CY7C271A~45WC W22 28-Lead (300-Mil) Windowed CerDIP CY7C271A~45DMB D22 28-Lead (300-Mil) CerDIP Military CY7C271A~45KMB K74 28-Lead Rectangular Cerpack CY7C271A~45LMB L55 32-Pin Rectangular Leadless Chip Carrier CY7C271A~45QMB Q55 32-Pin Windowed Rectangular Leadless Chip Carrier CY7C271A~4STMB 174 28-Lead Windowed Cerpack CY7C27LA~45WMB W22 28-Lead (300-Mil) Windowed CerDIP 55 CY7TC2TIA~SSIC J65 32-Lead Plastic Leaded Chip Carrier Commercial CY7TC2TIA~55PC P21 28-Lead (300-Mil) Molded DIP CY7C271A55WC W22 28-Lead (300-Mil} Windowed CerDIP CY7C27LA-55DMB D22 28-Lead (300-Mil) CerDIP Military CY7C271A-55KMB K74 28-Lead Rectangular Cerpack CY7C271A-55LMB L55 32-Pin Rectangular Leadless Chip Carrier CY7C271A55QMB Q55 32-Pin Windowed Rectangular Leadless Chip Carrier CY7C271A5STMB T74 28-Lead Windowed Cerpack CY7C271A55WMB W22 28-Lead (300-Mil) Windowed CerDIP Note: 8. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product avail- ability. 4~153PRELIMINARY CY7C271A p25 MILITARY SPECIFICATIONS Group A Subgroup Testing DC Characteristics Parameter Subgroups Vou 4,2,3 VoL 1,2,3 Vin 1.2.3 Vit 1,23 Ix 1, 2, 3 loz 1,2,3 Icc 1, 2,3 Isp 1,2,3 Switching Characteristics Parameter Subgroups taa 7, 8,9, 10, 11 tacs 7, 8,9, 10, 11 tack 7,8, 9, 10,11 Document #: 38-00424 4-154