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M27V322-150F6 데이터시트(PDF) 9 Page - STMicroelectronics |
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M27V322-150F6 데이터시트(HTML) 9 Page - STMicroelectronics |
9 / 23 page M27V322 Device operation 9/23 Figure 3. Programming flowchart 2.7 Program Inhibit Programming of multiple M27V322s in parallel with different data is also easily accomplished. Except for E, all like inputs including GVPP of the parallel M27V322 may be common. A TTL low level pulse applied to a M27V322's E input and VPP at 12V, will program that M27V322. A high level E input inhibits the other M27V322s from being programmed. 2.8 Program Verify A verify (read) should be performed on the programmed bits to determine that they were correctly programmed. The verify is accomplished with GVPP at VIL. Data should be verified with tELQV after the falling edge of E. 2.9 On-Board programming The M27V322 can be directly programmed in the application circuit. See the relevant Application Note AN620. AI03059B n = 0 Last Addr VERIFY E = 50 µs Pulse ++n = 25 ++ Addr VCC = 6.25V, VPP = 12V FAIL CHECK ALL WORDS 1st: VCC = 5V 2nd: VCC = 3V YES NO YES NO YES NO SET MARGIN MODE RESET MARGIN MODE |
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