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ST62T28C データシート(PDF) 82 Page - STMicroelectronics |
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ST62T28C データシート(HTML) 82 Page - STMicroelectronics |
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82 / 84 page  82/84 ST6228C 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The ST6228C is mask programmed ROM version of ST62T28C OTP devices. They offer the same functionality as OTP devices, selecting as ROM options the options defined in the programmable option byte of the OTP version. Figure 1. Programming wave form 1.2 ROM READOUT PROTECTION If the ROM READOUT PROTECTION option is selected, a protection fuse can be blown to pre- vent any access to the program memory content. In case the user wants to blow this fuse, high volt- age must be applied on the TEST pin. Figure 2. Programming Circuit Note: ZPD15 is used for overvoltage protection 0.5s min TEST 15 14V typ 10 5 TEST 100mA 4mA typ VR02001 max 150 µstyp t VR02003 TEST 5V 100nF 47mF PROTECT 100nF VDD VSS ZPD15 15V 14V 82 |
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