AT29C256-12 ATMEL Corporation, AT29C256-12 Datasheet
AT29C256-12
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AT29C256-12 Summary of contents
Page 1
... CMOS and TTL Compatible Inputs and Outputs Commercial and Industrial Temperature Ranges Description The AT29C256 is a 5-volt-only in-system Flash programmable and erasable read only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits. Manu- factured with Atmel’s advanced nonvolatile CMOS technology, the device offers ac- cess times with power dissipation of just 275 mW ...
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... Five-volt-only commands determine the opera- tion of the device. Reading data out of the device is similar to reading from a static RAM. Reprogramming the AT29C256 is performed on a page basis; 64-bytes of data are loaded into the device and then simultaneously pro- grammed. The contents of the entire device may be erased by using a 6-byte software code (although erasure before programming is not needed) ...
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... CE or WE. The 64-bytes of data must be loaded into each sector by the same procedure as outlined in the program section under device operation. HARDWARE DATA PROTECTION: protect against inadvertent programs to the AT29C256 in the following ways: (a) V sense— (typical), the program function is inhibited. ( delay— ...
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... MHz OUT -400 -100 4. AT29C256-12 AT29C256 10% 5V 10 OUT High Z High Z X High ...
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... ACC after the falling 4. This parameter is characterized and is not 100% tested ACC OE . ACC (1) Typ Max AT29C256 AT29C256-12 AT29C256-15 Min Max Min Max 120 150 120 150 Output Test Load Units ...
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... CS t Chip Select Hold Time CH t Write Pulse Width ( Data Set-up Time Data, OE Hold Time DH OEH t Write Pulse Width High WPH AC Byte Load Waveforms WE Controlled CE Controlled AT29C256 4-98 Min Max 100 Units ...
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... WE (or CE must be high when WE and CE are both low. Min 100 ( All bytes that are not loaded within the page being programmed will be indeterminate. AT29C256 Max Units 150 s ...
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... Software Protected Program Cycle Waveform Notes through A14 must specify the page address during each high to low transition of WE (or CE) after the software code has been entered. AT29C256 4-100 Software Data (1) Protection Disable Algorithm WRITES ENABLED ...
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... Notes: 1. Toggling either both OE and CE will operate toggle bit. 2. Beginning and ending state of I/O6 will vary. (1) Min 0 10 (2) 0 (1) Min 0 10 (2) 150 0 ( Any address location may be used but the address should not vary. AT29C256 Typ Max Typ Max Units Units 4-101 ...
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... Manufacture Code is read for Device Code is read for The device does not remain in identification mode if powered down. 4. The device returns to standard operation mode. 5. Manufacturer Code: 1F Device Code: DC AT29C256 4-102 Software Product Identification Exit ENTER PRODUCT IDENTIFICATION ( MODE IL; ...
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... AT29C256 4-103 ...
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... AT29C256-90PC 28P6 AT29C256-90TC 28T AT29C256-90JI 32J AT29C256-90PI 28P6 AT29C256-90TI 28T AT29C256-12JC 32J AT29C256-12PC 28P6 AT29C256-12TC 28T AT29C256-12JI 32J AT29C256-12PI 28P6 AT29C256-12TI 28T AT29C256-15JC 32J AT29C256-15PC 28P6 AT29C256-15TC 28T AT29C256-15JI 32J AT29C256-15PI 28P6 AT29C256-15TI 28T Package Type Operation Range Commercial ( ...