1 Features

1• Precision Supply Voltage Supervision Range:

0.9 V, 1.2 V, 1.5 V, 1.6 V, 2 V, and 3.3 V

• High Trip-Point Accuracy: 0.75%

• Supply Current of 1.2 μA (Typical)

• RESET Defined With Input Voltages as Low as

0.4 V

• Power-On Reset Generator With a Delay Time of

130 ms

• Push/Pull or Open-Drain RESET Outputs

• Package Temperature Range: –40°C to 125°C

2 Applications

• Applications Using Low-Power DSPs,

Microcontrollers, or Microprocessors

• Portable and Battery-Powered Equipment

• Intelligent Instruments

• Wireless Communication Systems

• Industrial Equipment

• Notebook and Desktop Computers

3 Description

The TPS310x and TPS311x families of supervisory

circuits provide circuit initialization and timing

supervision, primarily for DSP and processor-based

systems.

During power-on, RESET is asserted low when the

supply voltage (VDD) becomes higher than 0.4 V.

Thereafter, the supervisory circuit monitors VDD and

keeps the RESET output low as long as VDD remains

below the threshold voltage (VIT–). To ensure proper

system reset, after VDD surpasses the threshold

voltage, an internal timer delays the transition of the

RESET signal from low to high for the specified time.

When VDD drops below VIT–, the output transitions low

again.

All the devices of this family have a fixed-sense

threshold voltage (VIT–) set by an internal voltage

divider.

The TPS3103 and TPS3106 devices have an activelow,

open-drain RESET output and either an

integrated power-fail input (PFI) or SENSE input with

corresponding outputs for monitoring other voltages.

The TPS3110 has an active-low push/pull RESET

and a watchdog timer to monitor the operation of

microprocessors. All three devices have a manual

reset pin that can be used to force the outputs low

regardless of the sensed voltages.

The product spectrum is designed for supply voltages

of 0.9 V up to 3.6 V. The circuits are available in 6-pin

SOT-23 packages. The TPS31xx family is

characterized for operation over a temperature range

of –40°C to 125°C.