The TPS3803-Q1 and TPS3805-Q1 families of supervisory circuits provide
circuit initialization and timing supervision, primarily for DSPs and processor-based
The TPS3803G15-Q1 device has a fixed-sense threshold voltage
VIT set by an internal voltage divider, whereas the
TPS3803-01-Q1 has an adjustable SENSE input that can be configured by two external
resistors. In addition to the fixed sense threshold monitored at
VDD, the TPS3805-Q1 devices provide a second adjustable SENSE input.
RESET is asserted in case either of the two voltages drops below
During power on, RESET is asserted when supply voltage
VDD becomes higher than 0.8 V. Thereafter, the supervisory circuit monitors
VDD (and/or SENSE) and keeps RESET active as long as
VDD or SENSE remains below the threshold voltage VIT.
As soon as VDD (SENSE) rises above the threshold voltage
VIT, RESET is deasserted again. The product spectrum
is designed for 1.5-V, 3.3-V, and adjustable supply voltages.
The devices are available in a 5-pin SC-70 package. The TPS3803-Q1 and TPS3805-Q1
devices are characterized for operation
over a temperature range of 40°C to 125°C.