In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Robert,

as far as I have seen, the only voltage-critical part in your design is the MAX RS-232 level shifter. If you would use a MAX3232 device, the board should work at any supply from 3.3. to 5 Volts, or did I miss something ? In addition, the MAX3232 has the advantage that 100 nF pump-charge capacitors can be used instead of the 1 µF el-caps. Although the MAX3232 usually costs a bit more than the MAX232, I think the extra costs are well-spent to make your kit more "generic".

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