This document describes the features and characteristics of STMicroelectronics' ZEROPOWER® and TIMEKEEPER® supervisor products. These products use surface-mount technology and are suitable for automatic assembly-line processes. They interface directly with commodity SRAM and use a commercially available cell for the internal battery, which is easily replaceable. These devices are designed for lower system costs compared to designs using competitors' hybrid products. Moreover, even though the ST products need an external SRAM chip, the footprint of the two chips together is still 80% of that of the competitors' single chip solutions.