By combining some of supervisory features together with low power consumption and high threshold accuracy, a family of voltage monitoring supervisors from Intersil addresses the needs of designers who want to ensure the reliability of their systems without compromising features, performance or cost. The ISL88011-ISL88015 family offers both fixed and/or adjustable voltage monitoring with all the functions for critical monitoring, including power-on reset control, customisable supply voltage supervision, watchdog timer capability and manual reset. By integrating all of these features into a 5-pin SOT23 package and requiring 5.5µA of supply current, the ISL88011-ISL88015 family helps reduce system costs and board space for process control systems, intelligent instruments, embedded control systems, computers, and portable or battery-powered equipment. The devices are also for critical processor and controller power monitoring.

The voltage monitors are accurate to ±1.5 percent from -45 to 85 degrees C and draw current at 4.5µA to 8µA. They also monitor down to 600mV for lower power supply voltages and are designed using Intersil’s TwinPin design, which combines active-low reset output and manual reset input into one pin to provide maximum functionality in the same number of pins. An watchdog timer for microcontrollers and microprocessors provides a longer start-up timeout at power-on. This allows an operating system to boot, an FPGA to initialise, or system software to start without having to disable the watchdog timer during this time to avoid erroneous resets. Also, in order to provide designers with a full set of options based on their specific application requirements, the ISL88011, ISL88012 and ISL88013 feature fixed voltage trip points while the ISL88014 and ISL88015 provide user-adjustable voltage trip points. The ISL88011-ISL88015 family is available now in 5-lead SOT-23 packages. A complete evaluation kit, the ISL8801XEVAL, is also available to assist developers.