When the MAX16163 powers up, it measures the resistance on the PB/SLP pin to the ground and sets the sleep time properly. It then asserts the OUT output. When the downstream device (e.g., a μC) finishes its task, it asserts a falling edge on the CLRB pin; the MAX16163 then de-asserts OUT, and the sleep timer starts. When the sleep timer expires, the MAX16163 asserts OUT again.
When the MAX16164 powers up, it measures the resistance on the PB/SLP pin to the ground and sets the sleep time properly. It then keeps OUT de-asserted and puts the device in a SHUTDOWN state. The MAX16164 does not assert OUT until a pushbutton closure on the PB/SLP pin.
The Analog Devices MAX16163 and MAX16164 operate over the -40°C to +125°C temperature range and are available in a 1.54mm x 1.11mm, 6-bump thin wafer-level (WLP) and a 6-pin μDFN packages.