Pin Diagrams Figure . 8-Pin PDIP, SOIC Figure . 14-Pin PDIP, SOIC, TSSOP Figure . 16-Pin VQFN Note: It is recommended that the exposed bottom pad be connected to VSS; however, it must not be the only VSS connection to the device. Figure . 20-Pin PDIP, SOIC, SSOP Figure . 20-Pin VQFN Note: It is recommended that the exposed bottom pad be connected to VSS; however, it must not be the only VSS connection to the device. Figure . 28-Pin SPDIP, SOIC, SSOP Figure . 28-Pin VQFN Figure . 40-Pin PDIP Figure . 40-Pin VQFN Figure . 44-Pin TQFP