1 Features
• Power-on reset generator with a fixed delay time
of 200ms (TPS3823, TPS3824, TPS3825, and
TPS3828) or 25ms (TPS3820)
• Manual reset input (TPS3820, TPS3823,
TPS3825, and TPS3828)
• Reset output available in active-low (TPS3820,
TPS3823, TPS3824, and TPS3825), active-high
(TPS3824 and TPS3825), and open drain
(TPS3828)
• Supply voltage supervision range:
2.5V, 3V, 3.3V, 5V
• Watchdog timer (TPS3820, TPS3823, TPS3824,
and TPS3828)
• Supply current of 15μA (typical)
• 5-pin SOT-23 package
• Temperature range: −40°C to 85°C (−40°C to
125°C for TPS3823A-33)

2 Applications
• DSPs, microcontrollers, or microprocessors
• Industrial equipment
• Programmable controls
• Portable and battery-powered equipment
• Wireless communications systems
• Notebook and desktop computers

3 Description
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 1.1V. 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
make sure 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 200ms (TPS3820) and 1.6s (TPS3823, TPS3824,
and TPS3828).