FEATURES

Single Voltage Detector (TPS3803):

Adjustable/1.5 V

Dual Voltage Detector (TPS3805):

Adjustable/3.3 V

High ±1.5% Threshold Voltage Accuracy

Supply Current: 3 μA Typical at VDD = 3.3 V

Push/Pull Reset Output (TPS3805) Open-Drain

Reset Output (TPS3803)

Temperature Range: −40°C to +85°C

5-Pin SC−70 Package

APPLICATIONS

Applications Using DSPs, Microcontrollers,

or Microprocessors

Wireless Communication Systems

Portable/Battery-Powered Equipment

Programmable Controls

Intelligent Instruments

Industrial Equipment

Notebook/Desktop Computers

Automotive Systems

DESCRIPTION

The TPS3803 and TPS3805 families of supervisory

circuits provide circuit initialization and timing supervision,

primarily for DSPs and processor-based systems.

The TPS3803G15 device has a fixed-sense threshold

voltage VIT set by an internal voltage divider, whereas the

TPS3803−01 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 devices

provide a second adjustable SENSE input. RESET is

asserted in case any of the two voltages drops below VIT.

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 and

TPS3805 devices are characterized for operation over a

temperature range of −40°C to +85°C.