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 µA max. (less than 1 µA 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 Rapid Programming Algorithm - 100 µs/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 256K (32K x 8) Unregulated Battery-Voltage High Speed OTP CMOS EPROM 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. 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 Function A0 - A14 Addresses O0 - O7 Outputs CE Chip Enable OE Output Enable NC 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) System Considerations Standby mode supply current is typically less than 1 µA at 3V. The AT27BV256 simplifies system design and stretches battery lifetime even further by eliminating the need for power supply regulation. 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 µF 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 µF 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. 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 Rapid Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 µs/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. 3-4 AT27BV256 AT27BV256 Absolute Maximum Ratings* Block Diagram Temperature Under Bias .................. -40°C to +85°C Storage Temperature...................... -65°C to +125°C 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 CE Mode \ Pin (2) Read VIL Output Disable (2) Standby (2) Rapid VIH Program (3) PGM Verify (3) Optional PGM PGM VIL VIL X Verify (3) Inhibit (3) VIL VIH OE Ai VIL VPP Ai VIH X X X VIH VIL VCC High Z VCC (2) High Z VCC (3) DIN VCC (3) DOUT VCC (3) DOUT VPP VCC (3) High Z VCC VCC (3) VCC VPP Ai VIH DOUT (2) VPP Ai VIL VCC VCC Ai VCC X Outputs (2) VCC (1) VCC (4) Product Identification (3, 5) VIL VIL A9 = VH A0 = VIH or VIL A1 - A14 = VIL 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. Identification Code 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 0°C - 70°C -40°C - 85°C 2.7V to 3.6V 5V ± 10% -90 0°C - 70°C -40°C - 85°C 2.7V to 3.6V 5V ± 10% -12 0°C - 70°C -40°C - 85°C 2.7V to 3.6V 5V ± 10% -15 0°C - 70°C -40°C - 85°C 2.7V to 3.6V 5V ± 10% DC and Operating Characteristics for Read Operation Symbol Parameter Condition Min Max Units VCC = 2.7V to 3.6V ILI ILO IPP1 (2) Input Load Current VIN = 0V to VCC ±1 µA Output Leakage Current VOUT = 0V to VCC ±5 µA VPP = VCC 10 µA ISB1 (CMOS), CE = VCC ± 0.3V 20 µA ISB2 (TTL), CE = 2.0 to VCC + 0.5V 100 µA 8 mA VPP (1) Read/Standby Current VCC (1) Standby Current ISB ICC VCC Active Current VIL Input Low Voltage VIH Input High Voltage VOL Output Low Voltage VOH Output High Voltage f = 5 MHz, IOUT = 0 mA, CE = VIL, VCC = 3.6V VCC = 3.0 to 3.6V -0.6 0.8 V VCC = 2.7 to 3.6V -0.6 0.2 x VCC V VCC = 3.0 to 3.6V 2.0 VCC + 0.5 V 0.7 x VCC VCC + 0.5 V VCC = 2.7 to 3.6V IOL = 2.0 mA 0.4 V IOL = 100 µA 0.2 V IOL = 20 µA 0.1 V IOH = -2.0 mA 2.4 V IOH = -100 µA VCC - 0.2 V IOH = -20 µA VCC - 0.1 V VCC = 4.5V to 5.5V ILI ILO IPP1 (2) Input Load Current VIN = 0V to VCC ±1 µA Output Leakage Current VOUT = 0V to VCC ±5 µA VPP = VCC 10 µA ISB1 (CMOS), CE = VCC ± 0.3V 100 µA ISB2 (TTL), CE = 2.0 to VCC + 0.5V 1 mA f = 5 MHz, IOUT = 0 mA, CE = VIL 20 mA VPP (1) Read/Standby Current ISB VCC (1) Standby Current ICC VCC Active Current VIL Input Low Voltage -0.6 0.8 V VIH Input High Voltage 2.0 VCC + 0.5 V VOL Output Low Voltage IOL = 2.1 mA 0.4 V VOH Output High Voltage IOH = -400 µA Notes: 1. VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. 3-6 AT27BV256 2.4 V 2. VPP may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and IPP. AT27BV256 AC Characteristics for Read Operation (VCC = 2.7V to 3.6V and 4.5V to 5.5V) AT27BV256 -70 Symbol tACC (3) Parameter Condition Min Max -90 Min Max -12 Min -15 Max Min Max Units Address to Output Delay CE = OE = VIL 70 90 120 150 ns tCE (2) CE to Output Delay OE = VIL 70 90 120 150 ns tOE (2, 3) OE to Output Delay CE = VIL 50 50 50 60 ns 40 40 40 50 ns tDF (4, 5) OE or CE High to Output Float, whichever occurred first tOH Output Hold from Address, CE or OE, whichever occurred first Notes: 0 0 0 0 ns 2, 3, 4, 5. - see AC Waveforms for Read Operation. AC Waveforms for Read Operation (1) 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 µF 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 = 25°C) Typ Max Units CIN 4 8 pF VIN = 0V COUT 8 12 pF VOUT = 0V Note: 3-8 (1) Conditions 1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested. 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 µF capacitor is required across VPP and ground to suppress spurious voltage transients. DC Programming Characteristics TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V Symbol Parameter Test Conditions ILI Input Load Current VIN = VIL, VIH VIL Input Low Level VIH Input High Level VOL Output Low Voltage IOL = 2.1 mA VOH Output High Voltage IOH = -400 µA ICC2 VCC Supply Current (Program and Verify) IPP2 VPP Current VID A9 Product Identification Voltage Limits Max Units ±10 µA -0.6 0.8 V 2.0 VCC + 0.5 V 0.4 V Min 2.4 CE = VIL 11.5 V 25 mA 25 mA 12.5 V 3-9 AC Programming Characteristics Rapid Programming Algorithm TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V A 100 µs 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 µs 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 µs 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. Symbol Parameter Limits Test (1) Conditions* Max Units Min Address Setup Time 2 µs tOES OE Setup Time 2 µs tDS Data Setup Time 2 µs tAH Address Hold Time 0 µs tDH Data Hold Time 2 µs tDFP OE High to Output Float Delay (2) 0 tVPS VPP Setup Time 2 µs tVCS VCC Setup Time 2 µs tPW CE Program Pulse Width (3) Data Valid from OE (2) VPP Pulse Rise Time During Programming tAS tOE tPRT 130 95 ns 105 µs 150 ns 50 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 µsec ± 5%. Atmel’s 27BV256 Integrated (1) Product Identification Code Pins Codes Manufacturer Device Type Note: 3-10 A0 O7 O6 O5 O4 O3 O2 O1 O0 0 1 0 1 0 0 0 0 1 0 1 1 1 1 1 0 0 0 Hex Data 1E 8C 1. The AT27BV256 has the same Product Identification Code as the AT27C256R. Both are programming compatible. AT27BV256 AT27BV256 Ordering Information ICC (mA) tACC (ns) Active Standby 70 8 90 120 150 Ordering Code Package Operation Range 0.02 AT27BV256-70JC AT27BV256-70RC AT27BV256-70TC 32J 28R 28T Commercial (0°C to 70°C) 8 0.02 AT27BV256-70JI AT27BV256-70RI AT27BV256-70TI 32J 28R 28T Industrial (-40°C to 85°C) 8 0.02 AT27BV256-90JC AT27BV256-90RC AT27BV256-90TC 32J 28R 28T Commercial (0°C to 70°C) 8 0.02 AT27BV256-90JI AT27BV256-90RI AT27BV256-90TI 32J 28R 28T Industrial (-40°C to 85°C) 8 0.02 AT27BV256-12JC AT27BV256-12RC AT27BV256-12TC 32J 28R 28T Commercial (0°C to 70°C) 8 0.02 AT27BV256-12JI AT27BV256-12RI AT27BV256-12TI 32J 28R 28T Industrial (-40°C to 85°C) 8 0.02 AT27BV256-15JC AT27BV256-15RC AT27BV256-15TC 32J 28R 28T Commercial (0°C to 70°C) 8 0.02 AT27BV256-15JI AT27BV256-15RI AT27BV256-15TI 32J 28R 28T Industrial (-40°C to 85°C) Package Type 32J 32 Lead, Plastic J-Leaded Chip Carrier (PLCC) 28R 28 Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC) 28T 28 Lead, Plastic Thin Small Outline Package (TSOP) 3-11