256K (32K x 8) 5-volt Only Flash Memory AT29C256

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$Course Material\Efficiently Coding Communication Protocols in C++ ...$

AC Byte Load Characteristics Symbol Parameter Min Max Units t AS ,t OES Address, OE Set-up Time 0 ns t AH Address Hold Time 50 ns t CS Chip Select Set-up Time 0 ns t CH Chip Select Hold Time 0 ns t WP Write Pulse Width (WE or CE) 90 ns t DS Data Set-up Time 35 ns t DH ,t OEH Data, OE Hold Time 0 ns t WPH Write Pulse Width High 100 ns AC Byte Load Waveforms WE Controlled CE Controlled 8 <strong>AT29C256</strong> 0046O–FLASH–06/02
<strong>AT29C256</strong> Program Cycle Characteristics Symbol Parameter Min Max Units t WC WriteCycleTime 10 ms t AS Address Set-up Time 0 ns t AH Address Hold Time 50 ns t DS Data Set-up Time 35 ns t DH Data Hold Time 0 ns t WP Write Pulse Width 90 ns t BLC Byte Load Cycle Time 150 µs t WPH Write Pulse Width High 100 ns Program Cycle Waveforms (1)(2)(3) Notes: 1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE). 2. OE must be high when WE and CE are both low. 3. All bytes that are not loaded within the page being programmed will be indeterminate. 0046O–FLASH–06/02 9
Page 1 and 2: Features • Fast Read Access Time
Page 3 and 4: AT29C256 PROGRAM: Thedeviceisreprog
Page 5 and 6: AT29C256 DC and AC Operating Range
Page 7: AT29C256 Input Test Waveforms and M
Page 11 and 12: AT29C256 Data Polling Characteristi
Page 13 and 14: AT29C256 N O R M A L I Z E D I C C
Page 15 and 16: AT29C256 Packaging Information 32J
Page 17 and 18: AT29C256 28T - TSOP PIN 1 0º ~ 5º

256K (32K x 8) 5-volt Only Flash Memory AT29C256

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