28C256 DATASHEET PDF

28C datasheet, 28C pdf, 28C data sheet, datasheet, data sheet, pdf, Atmel, K 32K x 8 Paged CMOS E2PROM. 28C Microchip. K (32K x 8) CMOS Electrically Erasable PROM. PIN CONFIGURATION. Top View. A 1 A7. A A *NC. Vcc. WE. [1]. A2. 5 WE. A dimensions section on page 14 of this data sheet. ORDERING INFORMATION. PLCC−32 . 28C− 28C− Units. Min. Max. Min. Max. tRC.

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When the device is deselected, the CMOS standby current is less than Page Write Cycle Time: By raising A9 to 12V.

All bytes dur- ing a page write operation must reside on the same page as defined by the state of the A6 – A14 inputs.

X can be V. An optional software data protection mechanism is available to guard against inad- vertent writes.

Fast Write Cycle Times. CE may be delayed up to t. During a write cycle, the addresses and 1 to bytes of data are internally latched, freeing the address and data bus for other opera- tions. Refer to AC Programming Waveforms. No data will be written to the device; however, dataeheet the duration of t. Fast Read Access Time – ns.

28C – 28C K ns Parallel EEPROM Technical Data

Once the end of a write cycle has been detected a new access for a read or write can begin. Following the initiation of a write cycle, the device datashedt automatically write the latched data using an internal control timer. Please see Soft- ware Chip Erase application note for details.

After writing the 3-byte command sequence and after t.

Once the write cycle has been completed, true data is valid on all outputs, and the next write cycle may begin. A software controlled data protection feature has been implemented on the AT28C Atmel has incorporated both darasheet and software features that will protect the memory against inadvertent writes.

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28C256 Datasheet PDF

Each successive byte must be written within The data is latched by the first rising edge of CE or WE. Automatic Page Write Operation. For each WE high to low transition during the page write operation, A6 – A14 must be the same.

The address is latched on the falling edge darasheet CE or WE, whichever occurs last. After setting SDP, any attempt to write to the device with- out the 3-byte command sequence will start the internal write timers. The device utilizes internal error correction for extended endurance and improved data retention characteristics.

The outputs are put in the high impedance state when either CE or OE is high. Hardware features protect against inadvertent writes to the AT28C in the follow- ing ways: Address to Output Delay. Atmel’s 28C has additional features to ensure high quality and manufacturability. The xatasheet write operation of the AT28C allows 1 to bytes of data to be written into the device during a single internal catasheet period.

When enabled, the software data protection SDPwill prevent inadvertent writes.

Input Test Waveforms and Measurement Level. The data in the enable and disable command se- quences is not written to the device and the memory ad- dresses used in the sequence may be written with data in either a byte or page write operation. PROM memory are available to the user for device. OE may be delayed up to t. Its K of memory is organized as 32, words by 8 bits. This dual- line control gives designers flexibility in preventing bus contention in their system. The entire device can be erased using a 6-byte software code.

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OE to Output Delay. SDP is enabled by the host system issuing a series of three write commands; three specific bytes of data are written to three specific addresses refer to Software Data Protection Algorithm. Search field Part name Part description.

CE to Output Delay. Reading the toggle bit may begin at any datasheeh during the write cycle. If precautions are not taken, inad- vertent writes may occur during transitions of the host sys- tem power supply. Stresses beyond those listed under “Absolute Maxi. All command se- quences must conform to the page write timing specifica- tions.

Once a programming operation has been initiated and for the duration of t. The device also includes an extra bytes of E. Only bytes which are specified for writing will be written; unnecessary cycling of other bytes within the page does not occur.

Once set, SDP will remain active unless the disable com- mand sequence is adtasheet. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The A0 to A5 inputs are used to specify which 28c26 within the page are to be written. PROM for device identification or tracking. This is done by pre- ceding the data to be written by the same 3-byte command sequence used to enable SDP.