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M87C257-60C3TR Datasheet(PDF) 9 Page - STMicroelectronics |
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M87C257-60C3TR Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 22 page M87C257 Device operation 9/22 Figure 4. Programming flowchart 2.7 Program Inhibit Programming of multiple M87C257s in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M87C257 may be common. A TTL low level pulse applied to a M87C257's E input, with VPP at 12.75V, will program that M87C257. A high level E input inhibits the other M87C257s 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 G at VIL, E at VIH, VPP at 12.75V and VCC at 6.25V. AI00760B n = 0 Last Addr VERIFY E = 100 µs Pulse ++n = 25 ++ Addr VCC = 6.25V, VPP = 12.75V FAIL CHECK ALL BYTES 1st: VCC = 6V 2nd: VCC = 4.2V YES NO YES NO YES NO |
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