Multi-Voltage Supervisor for Three-Rail Sequencing
The Analog Devices LTC1728ES5-5#TRMPBF is a three-channel multi-voltage supervisor that monitors up to three supply rails simultaneously, asserting a common active-low reset when any monitored voltage falls below its threshold. It is designed for systems requiring reliable power-up sequencing and brown-out detection across multiple voltage domains, such as mixed-signal boards with 5V, 3.3V, and a core logic rail.
Output Type and Interface Considerations
This topology allows the reset signal to be wire-ORed with other reset sources, and the output remains valid even if the monitored supply drops to zero, because the pull-up is referenced to a separate rail. The 140ms minimum reset timeout ensures that the system clock and PLLs have time to settle before the processor is released from reset.
For production BOMs, this part presents no imminent obsolescence risk, though as with any active semiconductor, periodic PCN monitoring is recommended.