Description
   The CAT5401 is four digital POTs integrated with control logic and 16 bytes of NVRAM memory. Each digital POT consists of a series of 63 resistive elements connected between two externally accessible end points. The tap points between each resistive element are connected to the wiper outputs with CMOS switches. A separate 6-bit control register (WCR) independently controls the wiper tap switches for each digital POT. Associated with each wiper control register are four 6-bit non-volatile memory data registers (DR) used for storing up to four wiper settings. Writing to the wiper control register or any of the non-volatile data registers is via a SPI serial bus. On power-up, the contents of the first data register (DR0) for each of the four potentiometers is automatically loaded into its respective wiper control register.

FEATUREs
• Four Linear Taper Digital Potentiometers
• 64 Resistor Taps per Potentiometer
• End to End Resistance 2.5 kΩ, 10 kΩ, 50 kΩ or 100 kΩ
• Potentiometer Control and Memory Access via SPI Interface:
   Mode (0, 0) and (1, 1)
• Low Wiper Resistance, Typically 100Ω
• Nonvolatile Memory Storage for up to Four Wiper Settings for Each
   Potentiometer
• Automatic Recall of Saved Wiper Settings at Power Up
• 2.5 to 6.0 Volt Operation
• Standby Current Less than 1 μA
• 1,000,000 Nonvolatile WRITE Cycles
• 100 Year Nonvolatile Memory Data Retention
• 24-lead SOIC and 24-lead TSSOP
• Industrial Temperature Range
• These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
   Compliant