The TPS3836, TPS3837, and TPS3838 device families of supervisory circuits provide circuit
initialization and timing supervision, primarily for
digital
signal processors (DSP) and processor-based systems.During power-on, RESET is asserted when the supply voltage
VDD becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors
VDD and keeps the RESET output active as long as
VDD remains below the threshold voltage of VIT. An
internal timer delays the return of the output to the inactive state (high) to ensure proper system
reset. The delay time starts after VDD
rises above the threshold
voltage VIT.When CT is connected to GND, a fixed delay time of
typically 10 ms
is asserted. When connected to VDD, the delay time is typically 200 ms. When
the supply voltage drops below the threshold voltage VIT, the output becomes
active (low) again. All the devices of this family have a fixed-sense threshold voltage
(VIT) set by an internal voltage divider. The TPS3836 has an active-low, push-pull
RESET output. The TPS3837 has an active-high, push-pull RESET, and the
TPS3838 integrates an active-low, open-drain RESET output. The product
spectrum is designed for supply voltages of 1.8 V, 2.5 V, 3.0 V, and 3.3 V. The circuits are
available in either a SOT23-5 or a
2-mm
× 2-mm SON-6 package. The TPS3836, TPS3837, and TPS3838 families are characterized for operation
over a temperature range of –40°C to 85°C.
