fax id: 3013 1CY 27C2 56 CY27C256 32K x 8-Bit CMOS EPROM Features 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. • Wide speed range — 45 ns to 200 ns (commercial and military) • Low power — 248 mW (commercial) 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. — 303 mW (military) • 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- 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). Pin Configurations Logic Block Diagram O7 A14 A13 A12 A11 A10 DIP/Flatpack ROW ADDRESS 256 x 1024 PROGRAMABLE ARRAY O6 8 x 1 OF 128 MULTIPLEXER VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 O5 A9 A8 A7 A6 ADDRESS DECODER O4 A5 A4 A3 A2 O3 COLUMN ADDRESS O2 A1 GND LCC/PLCC[1] VCC A14 A13 A8 A9 A11 OE A10 CE 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 O7 O6 O5 O4 O3 A6 A5 A4 A3 A2 A1 A0 NC O0 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 A8 A9 A11 NC OE A10 CE O7 O6 27c256–3 27c256–2 A0 O1 POWER–DOWN 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 27C256-70 27C256-90 27C256-120 27C256-150 27C256-200 Maximum Access Time (ns) 45 55 70 90 120 150 200 Maximum Operating Current (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 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 21 20 19 18 17 16 15 14 13 12 11 10 9 8 27C256T 1 2 3 4 5 6 7 A10 CE O7 O6 O5 O4 O3 GND O2 O1 O0 A0 A1 A2 27c256–4 32-Pin TSOP T op View OE1 A19 A8 A 3 A1 NC4 A1 VCC P VP NC2 A1 7 A6 A5 A4 A3 A 32 31 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 27C256 29 28 27 26 25 24 23 22 21 20 19 18 17 NC A10 CE O7 O6 O5 O4 O3 GND O2 O1 O0 NC A0 A1 A2 27c256–5 Maximum Ratings DC Voltage Applied to Outputs in High Z State................................................ -0.5V to +7.0V (Above which the useful life may be impaired. For user guidelines, not tested.) DC Input Voltage .............................................-3.0V to +7.0V DC Program Voltage .................................................... 13.0V Storage Temperature ................................. -65°C to +150°C Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015) Ambient Temperature with Power Applied............................................. -55°C to +125°C Latch-Up Current ..................................................... >200 mA Supply Voltage to Ground Potential ................-0.5V to +7.0V UV Exposure ................................................ 7258 Wsec/cm 2 2 CY27C256 Operating Range Range Ambient Temperature VCC Commercial 0°C to +70°C 5V ±10% Industrial[2] -40°C to +85°C 5V ±10% -55°C to +125°C 5V ±10% Military [3] Electrical Characteristics Over the Operating Range[4] 27C256-45, 55, 70, 90, 120, 150, 200 Parameter Description Test Conditions VOH Output HIGH Voltage VCC = Min., IOH = –4.0 mA VOL Output LOW Voltage VCC = Min., IOL = 16.0 mA[5] VIH Input HIGH Level Guaranteed Input Logical HIGH Voltage for All Inputs VIL Input LOW Level IIX IOZ Min. Max. Unit 2.4 V 0.4 V 2.0 VCC V Guaranteed Input Logical LOW Voltage for All Inputs –0.3 0.8 V Input Current GND < VIN < VCC Output Leakage Current GND < VOUT < VCC, Output Disabled IOS Output Short Circuit Current[6] ICC Power Supply Current VCC = Max., VOUT = GND VCC = Max., VIN =VIH, IOUT = 0 mA, CE=VIL, OE = VIH VCC = Max., CE = VIH ISB Standby Supply Current VPP Programming Supply Voltage IPP Programming Supply Current VIHP Input HIGH Programming Voltage VILP Input LOW Programming Voltage –10 +10 µA Commercial –10 +10 µA Military –40 +40 –20 –90 mA Commercial 45 mA Military 55 Commercial 15 Military mA 20 12 13 V 50 mA 3.0 V 0.4 V Capacitance[7] Parameter Description CIN Input Capacitance COUT Output Capacitance Test Conditions TA = 25°C, f = 1 MHz, VCC = 5.0V Max. Unit 10 pF 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. 3 CY27C256 AC Test Loads and Waveforms 5V R1 250Ω (329Ω MIL) 5V R1 250Ω (329Ω MIL) ALL INPUT PULSES 3.0V OUTPUT OUTPUT R2 167Ω (202Ω MIL) 5 pF R2 167Ω (202Ω MIL) 30 pF INCLUDING JIG AND SCOPE INCLUDING JIG AND SCOPE 90% 10% GND 90% 10% ≤ 5 ns ≤ 5 ns 27c256–6 27c256–7 (b) High Z Load (a) Normal Load Equivalent to: THÉVENIN EQUIVALENT OUTPUT 100Ω 2.00V 125Ω OUTPUT Commercial 1.9V Military Switching Characteristics Over the Operating Range[4,7 ] Parameter Description 27C256-45 27C256-55 27C256-70 27C256-90 Min. Min. Min. Min. Max. Max. Max. 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 Output Enable Active to Output Valid 15 20 25 30 ns tHZCE Chip Enable Inactive to High Z 20 25 25 25 ns tACE Chip Enable Active to Output Valid 45 55 70 90 ns tPU Chip Enable Active to Power Up tPD Chip Enable Inactive to Power Down tOH Output Hold from Address Change 0 0 0 45 0 0 55 70 0 ns 90 0 0 ns ns Switching Characteristics Over the Operating Range[4, 7] Parameter Description 27C256-120 27C256-150 27C256-200 Min. Min. Min. Max. Max. 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 Valid 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 tPD Chip Enable Inactive to Power Down tOH Output Hold from Address Change 0 0 120 0 4 0 150 0 ns 200 0 ns ns CY27C256 Switching Waveform tPU tPD ICC SUPPLY CURRENT 50% POWER–DOWN CONTROLLED BY CE 50% A0 - A14 ADDRESS OE, CE tAA (tOE) tACE (tHZOE) tHZCE tOH O0 - O7 PREVIOUS DATA VALID HIGH Z DATA VALID 27c256–8 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. Erasure Characteristics Wavelengths of light less than 4000 Å 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. 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. The recommended dose of ultraviolet light for erasure is a wavelength of 2537 Å 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. Pin Function[8] Mode A14-A0 OE CE VPP O7-O0 O7-O0 Read A14-A0 VIL VIL X[9] Output Disable A14-A0 VIH VIL X High Z Power Down A14-A0 X VIH X 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 1.4 NORMALIZED ACCESS TIME vs. SUPPLY VOLTAGE NORMALIZED SUPPLY CURRENT vs. AMBIENT TEMPERATURE NORMALIZED SUPPLYCURRENT vs. SUPPLY VOLTAGE 1.3 1.3 1.25 1.2 1.15 1.2 1.2 1.1 1.1 1.1 1.05 1.0 1.0 1.0 0.9 0.95 0.9 0.8 TA =25°C f = fMAX 0.7 0.6 4.0 4.5 5.0 5.5 0.9 0.8 0.7 -100 6.0 -50 0 50 100 150 0.85 0.8 4.0 AMBIENT TEMPERATURE (°C) SUPPLY VOLTAGE (V) 60 30.0 1.3 50 25.0 1.2 40 20.0 1.1 30 15.0 1.0 20 0.8 -100 0 0 50 100 150 0 1.0 AMBIENT TEMPERATURE (°C) 2.0 3.0 4.0 0.0 0 200 400 175 1.2 1.15 1.1 150 125 100 1.05 1.0 75 0.95 VCC =5.0V TA =25°C VCC =5.6V TA =25°C 0.9 0.85 25 0.8 0.75 1.0 2.0 3.0 4.0 0 OUTPUT VOLTAGE(V) 100 200 300 400 500 CYCLE TIME(ns) 6 600 800 1000 CAPACITANCE (pF) NORMALIZED SUPPLYCURRENT vs. ACCESS TIME OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 0 0.0 VCC =4.5V TA =25°C 5.0 OUTPUT VOLTAGE (V) 50 6.0 10.0 VCC =5V TA =25°C 10 -50 5.5 TYPICAL ACCESS TIME CHANGE vs. OUTPUT LOADING 1.4 0.9 5.0 SUPPLY VOLTAGE (V) OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE NORMALIZED ACCESSTIME vs. TEMPERATURE 4.5 CY27C256 Ordering Information[10] Speed (ns) 45 55 70 90 120 150 200 Ordering Code Package Name Package Type Operating Range CY27C256-45JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier CY27C256-45PC P15 28-Lead (600-Mil) Molded DIP Commercial CY27C256-45WC W16 28-Lead (600-Mil) Windowed CerDIP CY27C256-45ZC Z32 32-Lead Thin Small Outline Package CY27C256-45WMB W16 28-Lead (600-Mil) Windowed CerDIP Military CY27C256-55JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier Commercial CY27C256-55PC P15 28-Lead (600-Mil) Molded DIP CY27C256-55WC W16 28-Lead (600-Mil) Windowed CerDIP CY27C256-55ZC Z32 32-Lead Thin Small Outline Package CY27C256-55WMB W16 28-Lead (600-Mil) Windowed CerDIP Military CY27C256-70JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier Commercial CY27C256-70PC P15 28-Lead (600-Mil) Molded DIP CY27C256-70WC W16 28-Lead (600-Mil) Windowed CerDIP CY27C256-70ZC Z32 32-Lead Thin Small Outline Package CY27C256-70WMB W16 28-Lead (600-Mil) Windowed CerDIP Military CY27C256-90JC J65 32-Pin Rectangular Plastic Leaded Chip Carrier Commercial CY27C256-90PC P15 28-Lead (600-Mil) Molded DIP CY27C256-90WC W16 28-Lead (600-Mil) Windowed CerDIP CY27C256-90ZC Z32 32-Lead Thin Small Outline Package CY27C256-90WMB W16 28-Lead (600-Mil) Windowed CerDIP Military 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-Lead Thin Small Outline Package CY27C256-120WMB W16 28-Lead (600-Mil) Windowed CerDIP Military 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-Lead Thin Small Outline Package CY27C256-150WMB W16 28-Lead (600-Mil) Windowed CerDIP Military 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-Lead Thin Small Outline Package 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. 7 CY27C256 Ordering Information (continued) Speed (ns) Ordering Code 45 55 70 Package Name Operating Range Package Type CY27C256T-45WC W22 28-Lead (300-Mil) Windowed CerDIP CY27C256T-45ZC Z28 28-Thin Small Outline Package Commercial CY27C256T-45WMB W22 28-Lead (300-Mil) Windowed CerDIP Military CY27C256T-55WC W22 28-Lead (300-Mil) Windowed CerDIP Commercial CY27C256T-55ZC Z28 28-Thin Small Outline Package CY27C256T-55WMB W22 28-Lead (300-Mil) Windowed CerDIP Military CY27C256T-70WC W22 28-Lead (300-Mil) Windowed CerDIP Commercial CY27C256T-70ZC Z28 28-Thin Small Outline Package CY27C256T-70WMB W22 28-Lead (300-Mil) Windowed CerDIP Military MILITARY SPECIFICATIONS Group A Subgroup Testing DC Characteristics Switching Characteristics Parameter Subgroups Parameter Subgroups VOH 1, 2, 3 tAA 7, 8, 9, 10, 11 VOL 1, 2, 3 tOE 7, 8, 9, 10, 11 VIH 1, 2, 3 tACE 7, 8, 9, 10, 11 VIL 1, 2, 3 IIX 1, 2, 3 IOZ 1, 2, 3 ICC 1, 2, 3 ISB 1, 2, 3 Document #: 38-00245-D 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 © 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.