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M27C4001-15C6X Datasheet(PDF) 8 Page - STMicroelectronics |
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M27C4001-15C6X Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 17 page M27C4001 8/17 PRESTO II Programming Algorithm PRESTO II Programming Algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 52.5 seconds. Pro- gramming with PRESTO II consists of applying a sequence of 100 µs program pulses to each byte until a correct verify occurs (see Figure 7). During programming and verify operation, a MARGIN MODE circuit is automatically activated in order to guarantee that each cell is programmed with enough margin. No overprogram pulse is applied since the verify in MARGIN MODE provides the necessary margin to each programmed cell. Program Inhibit Programming of multiple M27C4001s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including G of the parallel M27C4001 may be common. A TTL low level pulse applied to a M27C4001’s E input, with VPP at 12.75V, will program that M27C4001. A high level E input inhibits the other M27C4001s from being programmed. Program Verify A verify (read) should be performed on the pro- grammed bits to determine that they were correct- ly programmed. The verify is accomplished with G at VIL, E at VIH, VPP at 12.75V and VCC at 6.25V. Figure 6. Programming and Verify Modes AC Waveforms tAVPL VALID AI00725 A0-A18 Q0-Q7 VPP VCC G DATA IN DATA OUT E tQVEL tVPHEL tVCHEL tEHQX tELEH tGLQV tQXGL tGHQZ tGHAX PROGRAM VERIFY Figure 7. Programming Flowchart 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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