CAT5172 Digital Potentiometer (POT), 256-Tap, SPI Compatible The CAT5172 is a 256-position digital linear taper potentiometer ideally suited for replacing mechanical potentiometers and variable resistors. Like mechanical potentiometers, the CAT5172 has a CAT5172 V DD CS SPI A SDI INTERFACE CLK W B WIPER REGISTER GND Figure 1. Functional Block Diagram Table 1. ORDERING INFORMATION Part Number Resistance Temperature Range Package Shipping CAT5172TBI 50GT3 50 k 3000/Tape & Reel SOT23 8 40C to 85C (Pb Free) CAT5172TBI 00GT3 100 k 3000/Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 1. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device Nomenclature document, TND310/D, available at www.onsemi.com. Table 2. PIN FUNCTION DESCRIPTION Pin No. Pin Name Description 1 W Resistors Wiper Terminal. 2 V Positive Power Supply. DD 3 GND Digital Ground. 4 CLK Serial Clock Input. Positive edge triggered. 5 SDI Serial Data Input. 6 CS Chip Select Input, Active Low. When CS returns high, data will be loaded into the DAC register. 7 B Bottom Terminal of resistive element. 8 A Top Terminal of resistive element. Table 3. ABSOLUTE MAXIMUM RATINGS (Note 2) Rating Value Unit V to GND 0.3 to 6.5 V DD V , V , V to GND V A B W DD I 20 mA MAX Digital Inputs and Output Voltage to GND 0 to 6.5 V Operating Temperature Range 40 to +85 C Maximum Junction Temperature (T ) 150 C JMAX Storage Temperature 65 to +150 C Lead Temperature (Soldering, 10 sec) 300 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 2. Maximum terminal current is bounded by the maximum current handling of the switches, maximum power dissipation of the package, and maximum applied voltage across any two of the A, B, and W terminals at a given resistance.