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| AT27C256R Features * * * * * * * * * Fast Read Access Time - 45 ns Low Power CMOS Operation 100 A max. Standby 20 mA max. Active at 5 MHz JEDEC Standard Packages 28-Lead 600-mil PDIP 32-Lead PLCC 28-Lead TSOP and SOIC 5V 10% Supply 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 Integrated Product Identification Code Commercial and Industrial Temperature Ranges 256K (32K x 8) OTP CMOS EPROM Description The AT27C256R is a low-power, high performance 262,144 bit one-time programmable read only memory (OTP EPROM) organized 32K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45 ns, eliminating the need for speed reducing WAIT states on high performance microprocessor systems. Atmel's scaled CMOS technology provides low active power consumption, and fast programming. Power consumption is typically only 8 mA in Active Mode and less than 10 A in Standby. (continued) Pin Configurations Pin Name A0 - A14 O0 - O7 CE OE NC Function Addresses Outputs Chip Enable Output Enable No Connect PDIP, SOIC Top View AT27C256R PLCC Top View TSOP Top View Type 1 Note: PLCC Package Pins 1 and 17 are DON'T CONNECT. 0014G 3-125 Description (Continued) The AT27C256R is available in a choice of industry standard JEDEC-approved one time programmable (OTP) plastic DIP, PLCC, SOIC, and TSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention. With 32K byte storage capability, the AT27C256R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. Atmel's 27C256R 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. 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. 3-126 AT27C256R AT27C256R Block Diagram Absolute Maximum Ratings* Temperature Under Bias ................ -55C to +125C Storage Temperature...................... -65C to +150C 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 overshoot to +7.0V for pulses of less than 20 ns. Operating Modes Mode \ Pin Read Output Disable Standby Rapid Program PGM Verify PGM (2) (2) (2) CE VIL VIL VIH VIL X (1) OE VIL VIH X (1) Ai Ai X X Ai Ai Ai X (1) (3) (1) (1) VPP VCC VCC VCC VPP VPP VCC VPP VCC Outputs DOUT High Z High Z DIN DOUT DOUT High Z Identification Code VIH VIL VIL VIH VIL Optional PGM Verify Inhibit (2) VIL VIH VIL Product Identification (4) A9 = VH A0 = VIH or VIL A1 - A14 = VIL Notes: 1. X can be VIL or VIH. 2. Refer to Programming characteristics. 3. VH = 12.0 0.5V. 4. 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. 3-127 DC and AC Operating Conditions for Read Operation AT27C256R -45 Operating Temp. (Case) VCC Supply Com. 0C - 70C 5V 10% Ind. -40C - 85C -55 0C - 70C -40C - 85C 5V 10% -70 0C - 70C -40C - 85C 5V 10% -90 0C - 70C -40C - 85C 5V 10% -12 0C - 70C -40C - 85C 5V 10% -15 0C - 70C -40C - 85C 5V 10% DC and Operating Characteristics for Read Operation Symbol ILI ILO IPP1 ISB ICC VIL VIH VOL VOH (2) Parameter Input Load Current Output Leakage Current VPP (1) Condition VIN = 0V to VCC VOUT = 0V to VCC ISB1 (CMOS), CE = VCC 0.3V ISB2 (TTL), CE = 2.0 to VCC + 0.5V f = 5 MHz, IOUT = 0 mA, CE = VIL Min Max 1 5 10 100 1 20 Units A A A A mA mA V V V V Read/Standby Current VPP = VCC VCC (1) Standby Current VCC Active Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage -0.6 2.0 IOL = 2.1 mA IOH = -400 A 2.4 0.8 VCC + 0.5 0.4 Notes: 1. VCC must be applied simultaneously or before VPP, and removed simultaneously 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. AC Characteristics for Read Operation AT27C256R -45 Symbol tACC (3) tCE (2) tOE (2, 3) -55 Min Max -70 Min Max -90 Min Max -12 Min Max -15 Min Max Parameter Address to Output Delay CE to Output Delay OE to Output Delay Condition CE = OE = VIL OE = VIL CE = VIL Min Max Units ns ns ns ns ns 45 45 20 20 7 7 55 55 25 20 7 70 70 30 25 0 90 90 30 25 0 120 120 35 30 0 150 150 40 35 tDF (4, 5) tOH Notes: OE or CE High to Output Float, whichever occurred first Output Hold from Address, CE or OE, whichever occurred first 2, 3, 4, 5. - see AC Waveforms for Read Operation. 3-128 AT27C256R AT27C256R AC Waveforms for Read Operation (1) Notes: 1. Timing measurement reference level is 1.5V for -45 and -55 devices. Input AC drive levels are VIL = 0.0V and VIH = 3.0V. Timing measurement reference levels for all other speed grades are VOL = 0.8V and VOH = 2.0V. Input AC drive levels are VIL = 0.45V and VIH = 2.4V. 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. Input Test Waveforms and Measurement Levels For -45 and -55 devices only: Output Test Load tR, tF < 5 ns (10% to 90%) For -70, -90, -12, and -15 devices: Note: CL= 100 pF including jig capacitance, except for the -45 and -55 devices, where CL= 30 pF. tR, tF < 20 ns (10% to 90%) Pin Capacitance (f = 1MHz, T = 25C) Typ CIN COUT Note: (1) Max 6 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. 3-129 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 AT27C256R 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 Max 10 0.8 VCC + 1 0.4 Symbol Parameter Input Load Current Input Low Level Input High Level Output Low Volt. Output High Volt. VCC Supply Current (Program and Verify) VPP Current A9 Product Identification Voltage Min Units A ILI VIL VIH VOL VOH ICC2 IPP2 VID V V V V mA mA V 3-130 AT27C256R AT27C256R 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 27C256R Integrated Product Identification Code Pins Codes Manufacturer Device Type 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 3-131 Ordering Information tACC (ns) 45 ICC (mA) Active Standby Ordering Code AT27C256R-45JC AT27C256R-45PC AT27C256R-45RC AT27C256R-45TC AT27C256R-45JI AT27C256R-45PI AT27C256R-45RI AT27C256R-45TI AT27C256R-55JC AT27C256R-55PC AT27C256R-55RC AT27C256R-55TC AT27C256R-55JI AT27C256R-55PI AT27C256R-55RI AT27C256R-55TI AT27C256R-70JC AT27C256R-70PC AT27C256R-70RC AT27C256R-70TC AT27C256R-70JI AT27C256R-70PI AT27C256R-70RI AT27C256R-70TI AT27C256R-90JC AT27C256R-90PC AT27C256R-90RC AT27C256R-90TC AT27C256R-90JI AT27C256R-90PI AT27C256R-90RI AT27C256R-90TI AT27C256R-12JC AT27C256R-12PC AT27C256R-12RC AT27C256R-12TC AT27C256R-12JI AT27C256R-12PI AT27C256R-12RI AT27C256R-12TI Package 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T 32J 28P6 28R 28T Operation Range Commercial (0C to 70C) 20 0.1 20 0.1 Industrial (-40C to 85C) 55 20 0.1 Commercial (0C to 70C) 20 0.1 Industrial (-40C to 85C) 70 20 0.1 Commercial (0C to 70C) 20 0.1 Industrial (-40C to 85C) 90 20 0.1 Commercial (0C to 70C) 20 0.1 Industrial (-40C to 85C) 120 20 0.1 Commercial (0C to 70C) 20 0.1 Industrial (-40C to 85C) (continued) 3-132 AT27C256R AT27C256R Ordering Information (Continued) tACC (ns) 150 ICC (mA) Active Standby Ordering Code AT27C256R-15JC AT27C256R-15PC AT27C256R-15RC AT27C256R-15TC AT27C256R-15JI AT27C256R-15PI AT27C256R-15RI AT27C256R-15TI Package 32J 28P6 28R 28T 32J 28P6 28R 28T Operation Range Commercial (0C to 70C) 20 0.1 20 0.1 Industrial (-40C to 85C) Package Type 32J 28P6 28R 28T 32 Lead, Plastic J-Leaded Chip Carrier (PLCC) 28 Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 28 Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC) 28 Lead, Plastic Thin Small Outline Package (TSOP) 3-133 |
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