One-Time Programmable, Linear-Taper Digital Potentiometers VDD tUP CS tCU tCI tIL tIH tIC U/D tIW VW Figure 2. Increment-Mode Timing Diagram VDD tUP CS tCU tCI tIH tIL tIC U/D tIW VW Figure 3. Decrement-Mode Timing Diagram MAX5527/MAX5528/MAX5529 CS U/D VW WIPER REMAINS THE WIPER CHANGES SAME WITH U/D WITH U/D LOW AND HIGH AND CS RISING CS RISING Figure 4. CS Low-to-High Transition Timing Diagram PV One-Time Programming 3) A new programmed power-up position, locked wiper The MAX5527/MAX5528/MAX5529 power up and func- The wiper is set to the factory default position at power- tion after power-up with the wiper position set in one of up (midscale, tap 31). Connect PV to GND or leave three ways: floating to continue powering up the wiper position at 1) Factory default power-up position, midscale, adjustable midscale. See Table 1 for the default and one-time pro- wiper gramming options. 2) A newly programmed power-up position, adjustable wiper 8_______________________________________________________________________________________