AT28C256 ATMEL Corporation, AT28C256 Datasheet
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AT28C256
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AT28C256 Summary of contents
Page 1
... JEDEC Approved Byte-Wide Pinout Full Military, Commercial, and Industrial Temperature Ranges Description The AT28C256 is a high-performance Electrically Erasable and Programmable Read Only Memory. Its 256K of memory is organized as 32,768 words by 8 bits. Manufac- tured with Atmel’s advanced nonvolatile CMOS technology, the device offers access times to 150 ns with power dissipation of just 440 mW ...
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... Description (Continued) The AT28C256 is accessed like a Static RAM for the read or write cycle without the need for external components. The device contains a 64-byte page register to allow writ- ing 64-bytes simultaneously. During a write cycle, the addresses and 1 to 64-bytes of data are internally latched, freeing the address and data bus for other opera- tions ...
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... It should be noted, that once protected the host may still perform a byte or page write to the AT28C256. This is done by pre- ceding the data to be written by the same 3-byte command sequence used to enable SDP. Once set, SDP will remain active unless the disable com- mand sequence is issued ...
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... MHz OUT -400 A OH AT28C256-25 AT28C256-35 0°C - 70°C -40°C - 85°C -55°C - 125°C -55°C - 125°C 5V 10% 5V 10 OUT High High Z ...
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... Input Test Waveforms and Measurement Level < 5ns R F Pin Capacitance ( MHz 25° OUT Note: 1. This parameter is characterized and is not 100% tested. AT28C256-15 AT28C256-20 AT28C256-25 AT28C256-35 Min Max Min 150 150 ...
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... Chip Select Hold Time CH t Write Pulse Width ( Data Set-up Time Data, OE Hold Time DH OEH t Time to Data Valid DV Note Restriction AC Write Waveforms WE Controlled CE Controlled AT28C256 2-222 Min Max Units 100 (1) NR ...
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... Notes through A14 must specify the same page address during each high to low transition of WE (or CE must be high only when WE and CE are both low. Chip Erase Waveforms sec (min msec (min 12.0V 0.5V H Min AT28C256 AT28C256F 100 50 (1, 2) AT28C256 Max Units 150 s ns 2-223 ...
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... Software Protected Write Cycle Waveforms Notes through A14 must specify the same page address during each high to low transition of WE (or CE) after the software code has been entered must be high only when WE and CE are both low. AT28C256 2-224 Software Data (1) ...
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... Beginning and ending state of I/O6 will vary. (1) Min See AC Read Characteristics. (1) Min 10 10 (2) 150 0 2. See AC Read Characteristics. 3. Any address location may be used but the address should not vary. AT28C256 Typ Max Typ Max Units Units 2-225 ...
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... AT28C256 2-226 ...
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... AT28C256(E,F)-20JI AT28C256(E,F)-20PI 28P6 AT28C256(E,F)-20SI 28S AT28C256(E,F)-20TI AT28C256(E,F)-20DM/883 AT28C256(E,F)-20FM/883 28F AT28C256(E,F)-20LM/883 32L AT28C256(E,F)-20UM/883 28U AT28C256(E,F)-25JC AT28C256(E,F)-25PC 28P6 AT28C256-W AT28C256(E,F)-25JI AT28C256(E,F)-25PI 28P6 AT28C256(E,F)-25DM/883 AT28C256(E,F)-25FM/883 28F AT28C256(E,F)-25LM/883 32L AT28C256(E,F)-25UM/883 ...
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... ACC CC Active Standby (ns) (3) 150 50 0.35 50 0.35 (3) 200 50 0.35 50 0.35 (3) 250 50 0.35 AT28C256 2-228 Ordering Code Package 5962-88525 16 UX 28U 5962-88525 16 XX 28D6 5962-88525 16 YX 32L 5962-88525 16 ZX 28F 5962-88525 15 UX 28U 5962-88525 15 XX 28D6 5962-88525 15 YX 32L 5962-88525 15 ZX 28F 5962-88525 14 UX 28U ...
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... The following table lists standard Atmel products that can be ordered. Device Numbers Speed AT28C256 15 AT28C256E 15 AT28C256F 15 AT28C256 20 AT28C256E 20 AT28C256F 20 AT28C256 25 AT28C256E 25 AT28C256F 25 AT28C256 - Ordering Code 5962-88525 05 UX 5962-88525 05 XX 5962-88525 05 YX 5962-88525 05 ZX 5962-88525 03 UX 5962-88525 03 XX 5962-88525 03 YX 5962-88525 03 ZX 5962-88525 10 UX 5962-88525 10 XX ...
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... Lead, Plastic Thin Small Outline Package (TSOP) 28U 28 Pin, Ceramic Pin Grid Array (PGA) W Die Blank Standard Device: Endurance = 10K Write Cycles; Write Time = High Endurance Option: Endurance = 100K Write Cycles F Fast Write Option: Write Time = 3 ms AT28C256 2-230 Package Type Options ...