X28HC64DI-12 INTERSIL [Intersil Corporation], X28HC64DI-12 Datasheet
X28HC64DI-12
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X28HC64DI-12 Summary of contents
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... RAMs. The X28HC64 supports a 64-byte page write operation, effectively providing a 32µs/byte write cycle, and enabling the entire memory to be typically written in 0.25 seconds. The X28HC64 also features DATA Polling and Toggle Bit Polling, two methods providing early end of write detection ...
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... PIN DESCRIPTIONS Addresses ( The Address inputs select an 8-bit memory location during a read or write operation. Chip Enable (CE) The Chip Enable input must be LOW to enable all read/write operations. When CE is HIGH, power con- sumption is reduced. Output Enable (OE) The Output Enable input controls the data output buff- ers and is used to initiate read operations ...
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... Page Write Operation The page write feature of the X28HC64 allows the entire memory to be written in 0.25 seconds. Page write allows two to sixty-four bytes of data to be consecu- tively written to the X28HC64 prior to the commence- ment of the internal programming cycle. The host can ...
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DATA POLLING I/O 7 Figure 2. DATA Polling Bus Sequence Last Write HIGH Z I – Figure 3. DATA Polling Software Flow Write Data Writes Complete? Yes Save Last ...
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THE TOGGLE BIT I/O 6 Figure 4. Toggle Bit Bus Sequence Last WE Write Beginning and ending state of I/O Figure 5. Toggle Bit Software Flow Last Write Yes Load Accum From Addr N ...
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HARDWARE DATA PROTECTION The X28HC64 provides two hardware features that protect nonvolatile data from inadvertent writes. – Default V Sense—All write functions are inhibited CC when typically. CC – Write Inhibit—Holding either OE LOW, WE HIGH, or ...
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SOFTWARE DATA PROTECTION Figure 6. Timing Sequence—Byte or Page Write Data AAA ADDR 1555 CE WE Figure 7. Write Sequence for Software Data Protection Write Data AA to Address 1555 Write Data 55 to Address 0AAA Write ...
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RESETTING SOFTWARE DATA PROTECTION Figure 8. Reset Software Data Protection Timing Sequence V CC AAA Data 1555 0AAA ADDR CE WE Figure 9. Software Sequence to Deactivate Software Data Protection Write Data AA to Address 1555 Write Data 55 to ...
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... SYSTEM CONSIDERATIONS Because the X28HC64 is frequently used in large memory arrays provided with a two-line control architecture for both read and write operations. Proper usage can provide the lowest possible power dissipa- tion, and eliminate the possibility of contention where multiple I/O pins share the same bus. ...
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ABSOLUTE MAXIMUM RATINGS Temperature under bias X28HC64 ......................................... -10°C to +85°C X28HC64I, X28HC64M .................. -65°C to +135°C Storage temperature ......................... -65°C to +150°C Voltage on any pin with respect to V ......................................... -1V to +7V SS D.C. output current ............................................... ...
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ENDURANCE AND DATA RETENTION Parameter Minimum endurance Data retention POWER-UP TIMING Symbol (3) t Power-up to read operation PUR (3) t Power-up to write operation PUW CAPACITANCE T = +25° 1MHz Symbol Parameter (3) C Input/output ...
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A.C. CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Read Cycle Limits Symbol Parameter t Read cycle time RC t Chip enable access time CE t Address access time AA t Output enable access time OE ( ...
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WRITE CYCLE LIMITS Symbol Parameter (5) t Write cycle time WC t Address setup time AS t Address hold time AH t Write setup time CS t Write hold time pulse width High setup ...
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... Notes: (7) Between successive byte writes within a page write operation, OE can be strobed LOW: e.g. this can be done with CE and WE HIGH to fetch data from another memory device within the system for the next write; or with WE HIGH and CE LOW effectively performing a polling operation. ...
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DATA Polling Timing Diagram Address OEH I (9) Toggle Bit Timing Diagram OEH OE HIGH Z I/ I/O 6 Note: (9) Polling ...
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Ordering Information X28HC64 Device All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make ...