The TPS3307-18 is a micropower supply voltage supervisor designed for circuit initialization primarily in automotive DSP and processor-based systems, which require more than one supply voltage. The TPS3307-18 is designed for monitoring three independent supply voltages: 3.3 V/1.8 V/adj,. The adjustable SENSE input allows the monitoring of any supply voltage >1.25 V. The various supply voltage supervisors are designed to monitor the nominal supply voltage as shown in the following supply voltage monitoring table. During power-on,RESETis asserted when the supply voltage VDDbecomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors the SENSEn inputs and keepsRESETactive as long as SENSEn remain below the threshold voltage VIT+. An internal timer delays the return of theRESEToutput to the inactive state (high) to ensure proper system reset. The delay time, td typ= 200 ms, starts after all SENSEn inputs have risen above the threshold voltage VIT+. When the voltage at any SENSE input drops below the threshold voltage VIT–, theRESEToutput becomes active (low) again. The TPS3307-18 incorporates a manual reset input,MR. A low level atMRcausesRESETto become active. In addition to the active-lowRESEToutput, the TPS3307-18 includes an active-high RESET output. The TPS3307-18 is a micropower supply voltage supervisor designed for circuit initialization primarily in automotive DSP and processor-based systems, which require more than one supply voltage. The TPS3307-18 is designed for monitoring three independent supply voltages: 3.3 V/1.8 V/adj,. The adjustable SENSE input allows the monitoring of any supply voltage >1.25 V. The various supply voltage supervisors are designed to monitor the nominal supply voltage as shown in the following supply voltage monitoring table. During power-on,RESETis asserted when the supply voltage VDDbecomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors the SENSEn inputs and keepsRESETactive as long as SENSEn remain below the threshold voltage VIT+. An internal timer delays the return of theRESEToutput to the inactive state (high) to ensure proper system reset. The delay time, td typ= 200 ms, starts after all SENSEn inputs have risen above the threshold voltage VIT+. When the voltage at any SENSE input drops below the threshold voltage VIT–, theRESEToutput becomes active (low) again. The TPS3307-18 incorporates a manual reset input,MR. A low level atMRcausesRESETto become active. In addition to the active-lowRESEToutput, the TPS3307-18 includes an active-high RESET output.

The TL1431 is a precision programmable reference with specified thermal stability over automotive, commercial, and military temperature ranges. The output voltage can be set to any value between VI(ref)(approximately 2.5 V) and 36 V with two external resistors. This device has a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turnon characteristic, making the device an excellent replacement for Zener diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and switching power supplies. The TL1431 is characterized for operation over the full military temperature range of –55°C to 125°C. The TL1431 is a precision programmable reference with specified thermal stability over automotive, commercial, and military temperature ranges. The output voltage can be set to any value between VI(ref)(approximately 2.5 V) and 36 V with two external resistors. This device has a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turnon characteristic, making the device an excellent replacement for Zener diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and switching power supplies. The TL1431 is characterized for operation over the full military temperature range of –55°C to 125°C.