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| AT27BV256 Features * * * * * * * * * * Fast Read Access Time - 70 ns Dual Voltage Range Operation Unregulated Battery Power Supply Range, 2.7V to 3.6V or Standard 5V 10% Supply Range Pin Compatible with JEDEC Standard AT27C256 Low Power CMOS Operation 20 A max. (less than 1 A typical) Standby for VCC = 3.6V 29 mW max. Active at 5 MHz for VCC = 3.6V JEDEC Standard Surface Mount Packages 32-Lead PLCC 28-Lead 330-mil SOIC 28-Lead TSOP High Reliability CMOS Technology 2,000V ESD Protection 200 mA Latchup Immunity RapidTM Programming Algorithm - 100 s/byte (typical) CMOS and TTL Compatible Inputs and Outputs JEDEC Standard for LVTTL and LVBO Integrated Product Identification Code Commercial and Industrial Temperature Ranges Description The AT27BV256 is a high performance, low power, low voltage 262,144 bit one-time programmable read only memory (OTP EPROM) organized as 32K by 8 bits. It requires only one supply in the range of 2.7V to 3.6V in normal read mode operation, making it ideal for fast, portable systems using either regulated or unregulated battery power. 256K (32K x 8) Unregulated Battery-VoltageTM High Speed OTP CMOS EPROM Atmel's innovative design techniques provide fast speeds that rival 5V parts while keeping the low power consumption of a 3V supply. At VCC = 2.7V, any word can be accessed in less than 70 ns. With a typical power dissipation of only 18 mW at 5 MHz and VCC = 3V, the AT27BV256 consumes less than one fifth the power of a standard 5V EPROM. (continued) AT27BV256 Pin Configurations Pin Name A0 - A14 O0 - O7 CE OE NC Function Addresses Outputs Chip Enable Output Enable No Connect SOIC Top View PLCC Top View TSOP Top View Type 1 Note: PLCC Package Pins 1 and 17 are DON'T CONNECT. 0601A 3-3 Description (Continued) Standby mode supply current is typically less than 1 A at 3V. The AT27BV256 simplifies system design and stretches battery lifetime even further by eliminating the need for power supply regulation. The AT27BV256 is available in industry standard JEDECapproved one-time programmable (OTP) plastic PLCC, SOIC and TSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention. The AT27BV256 operating with VCC at 3.0V produces TTL level outputs that are compatible with standard TTL logic devices operating at VCC = 5.0V. At VCC = 2.7V, the part is compatible with JEDEC approved low voltage battery operation (LVBO) interface specifications. The device is also capable of standard 5-volt operation making it ideally suited for dual supply range systems or card products that are pluggable in both 3-volt and 5-volt hosts. Atmel's AT27BV256 has additional features to ensure high quality and efficient production use. The RapidTM Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 s/byte. The Integrated Product Identification Code electronically identifies the device and manufacturer. This feature is used by industry standard programming equipment to select the proper programming algorithms and voltages. The AT27BV256 programs exactly the same way as a standard 5V AT27C256R and uses the same programming equipment. System Considerations Switching between active and standby conditions via the Chip Enable pin may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device non-conformance. At a minimum, a 0.1 F high frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the VCC and Ground terminals of the device, as close to the device as possible. Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7 F bulk electrolytic capacitor should be utilized, again connected between the VCC and Ground terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array. 3-4 AT27BV256 AT27BV256 Block Diagram Absolute Maximum Ratings* Temperature Under Bias .................. -40C to +85C Storage Temperature...................... -65C to +125C Voltage on Any Pin with Respect to Ground......................... -2.0V to +7.0V (1) Voltage on A9 with Respect to Ground ...................... -2.0V to +14.0V (1) VPP Supply Voltage with Respect to Ground....................... -2.0V to +14.0V (1) *NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note: 1. Minimum voltage is -0.6V dc which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is VCC + 0.75V dc which may be exceeded if certain precautions are observed (consult application notes) and which may overshoot to +7.0V for pulses of less than 20 ns. Operating Modes Mode \ Pin Read (2) (2) CE VIL VIL VIH VIL X Verify (3) VIL VIH VIL (3) OE VIL VIH X VIH VIL VIL VIH VIL Ai Ai X X Ai Ai Ai X A9 = VH A0 = VIH or VIL A1 - A14 = VIL (4) (1) VPP VCC VCC VCC VPP VPP VCC VPP VCC VCC VCC VCC VCC VCC VCC VCC VCC (2) (2) (2) (3) (3) (3) (3) Outputs DOUT High Z High Z DIN DOUT DOUT High Z Identification Code Output Disable Standby (2) Rapid Program (3) PGM Verify PGM Optional PGM Inhibit (3) Product Identification (3, 5) VCC (3) Notes: 1. X can be VIL or VIH. 2. Read, output disable, and standby modes require, 2.7V VCC 3.6V, or 4.5V VCC 5.5V. 3. Refer to Programming Characteristics. Programming modes require VCC = 6.5V. 4. VH = 12.0 0.5V. 5. Two identifier bytes may be selected. All Ai inputs are held low (VIL), except A9 which is set to VH and A0 which is toggled low (VIL) to select the Manufacturer's Identification byte and high (VIH) to select the Device Code byte. 3-5 DC and AC Operating Conditions for Read Operation AT27BV256 Com. Operating Temperature (Case) Ind. VCC Power Supply -70 0C - 70C -40C - 85C 2.7V to 3.6V 5V 10% -90 0C - 70C -40C - 85C 2.7V to 3.6V 5V 10% -12 0C - 70C -40C - 85C 2.7V to 3.6V 5V 10% -15 0C - 70C -40C - 85C 2.7V to 3.6V 5V 10% DC and Operating Characteristics for Read Operation Symbol ILI ILO IPP1 ISB ICC VIL VIH (2) Parameter Input Load Current Output Leakage Current VPP (1) Condition VIN = 0V to VCC VOUT = 0V to VCC VPP = VCC ISB1 (CMOS), CE = VCC 0.3V ISB2 (TTL), CE = 2.0 to VCC + 0.5V f = 5 MHz, IOUT = 0 mA, CE = VIL, VCC = 3.6V VCC = 3.0 to 3.6V VCC = 2.7 to 3.6V VCC = 3.0 to 3.6V VCC = 2.7 to 3.6V IOL = 2.0 mA IOL = 100 A IOL = 20 A IOH = -2.0 mA Min Max 1 5 10 20 100 8 Units A A A A A mA V V V V V V V V V V VCC = 2.7V to 3.6V Read/Standby Current VCC (1) Standby Current VCC Active Current Input Low Voltage Input High Voltage -0.6 -0.6 2.0 0.8 0.2 x VCC VCC + 0.5 0.4 0.2 0.1 0.7 x VCC VCC + 0.5 VOL Output Low Voltage 2.4 VCC - 0.2 VCC - 0.1 1 5 10 100 1 20 -0.6 2.0 0.8 VCC + 0.5 0.4 2.4 VOH Output High Voltage IOH = -100 A IOH = -20 A VCC = 4.5V to 5.5V ILI ILO IPP1 ISB ICC VIL VIH VOL VOH (2) Input Load Current Output Leakage Current VPP (1) VIN = 0V to VCC VOUT = 0V to VCC VPP = VCC ISB1 (CMOS), CE = VCC 0.3V ISB2 (TTL), CE = 2.0 to VCC + 0.5V f = 5 MHz, IOUT = 0 mA, CE = VIL A A A A mA mA V V V V Read/Standby Current VCC (1) Standby Current VCC Active Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage IOL = 2.1 mA IOH = -400 A Notes: 1. VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. 2. VPP may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and IPP. 3-6 AT27BV256 AT27BV256 AC Characteristics for Read Operation (VCC = 2.7V to 3.6V and 4.5V to 5.5V) AT27BV256 -70 Symbol tACC tCE tOE (3) (2) (2, 3) -90 Min Max -12 Min Max -15 Min Max Parameter Address to Output Delay CE to Output Delay OE to Output Delay OE or CE High to Output Float, whichever occurred first Output Hold from Address, CE or OE, whichever occurred first Condition CE = OE = VIL OE = VIL CE = VIL Min Max Units ns ns ns ns ns 70 70 50 40 0 0 90 90 50 40 0 120 120 50 40 0 150 150 60 50 tDF (4, 5) tOH Notes: 2, 3, 4, 5. - see AC Waveforms for Read Operation. (1) AC Waveforms for Read Operation Notes: 1. Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified. 2. OE may be delayed up to tCE-tOE after the falling edge of CE without impact on tCE. 3. OE may be delayed up to tACC-tOE after the address is valid without impact on tACC. 4. This parameter is only sampled and is not 100% tested. 5. Output float is defined as the point when data is no longer driven. 6. When reading a 27BV256, a 0.1 F capacitor is required across VCC and ground to supress spurious voltage transients. 3-7 Input Test Waveform and Measurement Level Output Test Load tR, tF < 20 ns (10% to 90%) Note: CL = 100 pF including jig capacitance. Pin Capacitance (f = 1 MHz, T = 25C) Typ CIN COUT Note: (1) Max 8 12 Units pF pF Conditions VIN = 0V VOUT = 0V 4 8 1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested. 3-8 AT27BV256 AT27BV256 Programming Waveforms (1) Notes: 1. The Input Timing Reference is 0.8V for VIL and 2.0V for VIH. 2. tOE and tDFP are characteristics of the device but must be accommodated by the programmer. 3. When programming the AT27BV256 a 0.1 F capacitor is required across VPP and ground to suppress spurious voltage transients. DC Programming Characteristics TA = 25 5C, VCC = 6.5 0.25V, VPP = 13.0 0.25V Test Conditions VIN = VIL, VIH -0.6 2.0 IOL = 2.1 mA IOH = -400 A 2.4 25 CE = VIL 11.5 25 12.5 Limits Min Max 10 0.8 VCC + 0.5 0.4 Units A Symbol Parameter Input Load Current Input Low Level Input High Level Output Low Voltage Output High Voltage VCC Supply Current (Program and Verify) VPP Current A9 Product Identification Voltage ILI VIL VIH VOL VOH ICC2 IPP2 VID V V V V mA mA V 3-9 AC Programming Characteristics TA = 25 5C, VCC = 6.5 0.25V, VPP = 13.0 0.25V Symbol Parameter Test (1) Conditions* Limits Min Max Units s s s s s Rapid Programming Algorithm A 100 s CE pulse width is used to program. The address is set to the first location. VCC is raised to 6.5V and VPP is raised to 13.0V. Each address is first programmed with one 100 s CE pulse without verification. Then a verification / reprogramming loop is executed for each address. In the event a byte fails to pass verification, up to 10 successive 100 s pulses are applied with a verification after each pulse. If the byte fails to verify after 10 pulses have been applied, the part is considered failed. After the byte verifies properly, the next address is selected until all have been checked. VPP is then lowered to 5.0V and VCC to 5.0V. All bytes are read again and compared with the original data to determine if the device passes or fails. tAS Address Setup Time Data Setup Time Address Hold Time Data Hold Time OE High to Output Float Delay (2) VPP Setup Time VCC Setup Time CE Program Pulse Width (3) Data Valid from OE (2) VPP Pulse Rise Time During Programming 2 2 2 0 2 0 2 2 95 105 150 50 130 tOES OE Setup Time tDS tAH tDH tDFP tVPS tVCS tPW tOE tPRT ns s s s ns ns *AC Conditions of Test: Input Rise and Fall Times (10% to 90%)...........20 ns Input Pulse Levels................................0.45V to 2.4V Input Timing Reference Level................0.8V to 2.0V Output Timing Reference Level.............0.8V to 2.0V Notes: 1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP. 2. This parameter is only sampled and is not 100% tested. Output Float is defined as the point where data is no longer driven --see timing diagram. 3. Program Pulse width tolerance is 100 sec 5%. Atmel's 27BV256 Integrated (1) Product Identification Code Pins Codes Manufacturer Device Type Note: A0 O7 O6 O5 O4 O3 O2 O1 O0 Hex Data 1E 8C 0 1 0 1 0 0 0 0 1 0 1 1 1 1 1 0 0 0 1. The AT27BV256 has the same Product Identification Code as the AT27C256R. Both are programming compatible. 3-10 AT27BV256 AT27BV256 Ordering Information tACC (ns) 70 ICC (mA) Active Standby Ordering Code AT27BV256-70JC AT27BV256-70RC AT27BV256-70TC AT27BV256-70JI AT27BV256-70RI AT27BV256-70TI AT27BV256-90JC AT27BV256-90RC AT27BV256-90TC AT27BV256-90JI AT27BV256-90RI AT27BV256-90TI AT27BV256-12JC AT27BV256-12RC AT27BV256-12TC AT27BV256-12JI AT27BV256-12RI AT27BV256-12TI AT27BV256-15JC AT27BV256-15RC AT27BV256-15TC AT27BV256-15JI AT27BV256-15RI AT27BV256-15TI Package 32J 28R 28T 32J 28R 28T 32J 28R 28T 32J 28R 28T 32J 28R 28T 32J 28R 28T 32J 28R 28T 32J 28R 28T Operation Range Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) 8 0.02 8 0.02 90 8 0.02 8 0.02 120 8 0.02 8 0.02 150 8 0.02 8 0.02 Package Type 32J 28R 28T 32 Lead, Plastic J-Leaded Chip Carrier (PLCC) 28 Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC) 28 Lead, Plastic Thin Small Outline Package (TSOP) 3-11 |
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