TPS3820-33DBVRG4.A中文资料德州仪器数据手册PDF规格书

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).