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M27C160-150B6 데이터시트(PDF) 10 Page - STMicroelectronics |
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M27C160-150B6 데이터시트(HTML) 10 Page - STMicroelectronics |
10 / 26 page Device description M27C160 10/26 applying a sequence of 50µs program pulses to each word until a correct verify occurs (see Figure 5). During programing and verify operation a Margin mode circuit is automatically activated to guarantee that each cell is programed with enough margin. No overprogram pulse is applied since the verify in Margin mode provides the necessary margin to each programmed cell. Figure 5. Programming Flowchart 2.7 Program Inhibit Programming of multiple M27C160s in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C160 may be common. A TTL low level pulse applied to a M27C160's E input and VPP at 12.5V, will program that M27C160. A high level E input inhibits the other M27C160s 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 E at VIH and G at VIL, VPP at 12.5V and VCC at 6.25V. 2.9 Electronic Signature The Electronic Signature (ES) mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and type. This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C AI01044B n = 0 Last Addr VERIFY E = 50 µs Pulse ++n = 25 ++ Addr VCC = 6.25V, VPP = 12.5V FAIL CHECK ALL WORDS BYTEVPP =VIH 1st: VCC = 6V 2nd: VCC = 4.2V YES NO YES NO YES NO |
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