A range of microprocessor supply voltage supervisory and reset Circuits from Texas Instruments with fixed threshold voltage levels.

The Texas Instruments TPS3820 family of supervisors provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power on, RESET asserts when the supply voltage VDD becomes greater than 1.1 V. Thereafter, the supply voltage supervisor monitors VDDand keeps RESET active low as long as VDD remain sless than the threshold voltage, VIT−. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time,td, starts after VDD has risen above the threshold voltage (VIT− + VHYS). When the supply voltage drops below the threshold voltage VIT−, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage, VIT–, set by an internal voltage divider. These family also offers watch dog time out options of 200 ms (TPS3820) and 1.6 s (TPS3823/4/8).

Power-On reset generator with fixed delay time of 200 ms (TPS3823/4/5/8) or 25 ms (TPS3820)
Manual reset input (TPS3820/3/5/8)
Reset output available in active-low (TPS3820/3/4/5), active-high (TPS3824/5), and open drain (TPS3828)
Supply voltage supervision range:
2.5 V, 3 V, 3.3 V, 5 V
Watchdog timer (TPS3820/3/4/8)
Supply current of 15 μA (Typical)
5-Pin SOT-23 package
Temperature range: −40°C to 85°C (−40°C to 125°C for TPS3823A-33)

Microprocessor Supply Voltage Supervisory & Reset Circuits

Power supply voltage monitoring and supervisory circuits for use in desktop, laptop and notebook computers, test and measurement instruments, portable battery-powered equipment and multiple-output power supplies.

Supply Voltage Detector
Supply Voltage Supervisor
Power Supply Supervisor
Microprocessor Supervisory
Microprocessor Voltage Supervisor
Microcontroller Reset Circuit