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M27C64A 数据表(PDF) 7 Page - STMicroelectronics |
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M27C64A 数据表(HTML) 7 Page - STMicroelectronics |
7 / 11 page tAVPL VALID AI00779 A0-A12 Q0-Q7 VPP VCC P G DATA IN DATA OUT E tQVPL tVPHPL tVCHPL tPHQX tPLPH tGLQV tQXGL tELPL tGHQZ tGHAX PROGRAM VERIFY Figure 6. Programming and Verify Modes AC Waveforms AI01167 n= 1 Last Addr VERIFY P = 1ms Pulse ++n >25 ++ Addr VCC = 6V, VPP = 12.5V FAIL CHECK ALL BYTES 1st: VCC =6V 2nd: VCC = 4.2V YES NO YES NO YES NO P = 3ms Pulse by n Figure 7. Programming Flowchart Programming When delivered (and after each erasure for UV EPROM), all bits of the M27C64A are in the “1” state. Data is introduced by selectively program- ming ”0s” into the desired bit locations. Although only “0s” will be programmed, both “1s” and “0s” can be present in the data word. The only way to change a “0” to a ”1” is by die exposition to ultra- violet light (UV EPROM). The M27C64A is in the programming mode when Vpp input is at 12.5V, and E and P are at TTL-low. The data to be programmed is applied 8 bits in parallel to the data output pins. The levels required for the address and data inputs are TTL. VCC is specified to be 6V ± 0.25V. High Speed Programming The high speed programming algorithm, described in the flowchart, rapidly programs the M27C64A using an efficient and reliable method, particularly suited to the production programming environ- ment. An individual device will take around1 minute to program. Program Inhibit Programming of multiple M27C64A in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C64A may be common. A TTL low level pulse applied to a M27C64A E input, with P low and VPP 7/11 M27C64A |
类似零件编号 - M27C64A |
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类似说明 - M27C64A |
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