The TPS382x 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 VDD and keeps RESET
active low as long as VDD remains less 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. The TPS382x family also
offers watchdog time out options of 200 ms (TPS3820) and 1.6 s (TPS3823, TPS3824,
and TPS3828).
