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M27V402-180K4TR датащи(PDF) 8 Page - STMicroelectronics |
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M27V402-180K4TR датащи(HTML) 8 Page - STMicroelectronics |
8 / 13 page M27V405 8/13 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 100ms 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 M27V405s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including G of the parallel M27V405 may be common. A TTL low level pulse applied to a M27V405’s E input, with VPP at 12.75V, will program that M27V405. A high level E input inhibits the other M27V405s from being pro- grammed. 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 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. On-Board Programming Programming the M27V405 may be performed di- rectly in the application circuit, however this re- quires modification to the PRESTO II Algorithm (see Figure 8). For in-circuit programming VCC is determined by the user and normally is compatible with other components using the same supply volt- age. It is recommended that the maximum value of VCC which remains compatible with the circuit is used. Typically VCC=5.5V for programming systems us- ing VCC=5V, and VCC=3.5V for low voltage 3V systems is recommended. The value of VCC does not affect the programming, it gives a higher test capability in VERIFY mode. VPP must be kept at 12.75 volts to maintain and enable the programming. |
Аналогичный номер детали - M27V402-180K4TR |
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Аналогичное описание - M27V402-180K4TR |
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