9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

9.1.1 Monitoring Multiple Supplies

Because the TLV803 has an open-drain output, multiple TLV803 outputs can be directly tied together to form a

logical OR-ing function for the RESET line. Only one pull-up resistor is required for this configuration. Figure 9-1

shows two TLV803s connected together to provide monitoring of a 3.3-V power rail and a 5.0-V power rail. A

reset is generated if either power rail falls below the threshold voltage of its corresponding TLV803.

GND

V

DD

RESET

RST

TLV803M

Microprocessor

100kW

0.1 mF

5.0V

GND

V

DD

RESET

TLV803S

0.1 mF

3.3V

V

IO

V

CORE

3.3V

Figure 9-1. Multiple Voltage Rail Monitoring

9.1.2 Output Level Shifting

The RESET output of the TLV803 can be pulled to a maximum voltage of 6 V and can be pulled higher in voltage

than VDD. It is useful to provide level shifting of the output for cases where the monitored voltage is less than the

useful logic levels of the load. Figure 9-2 shows the TLV803Z used to monitor a 2.5-V power rail, with a logic

RESET input to a microprocessor that is connected to 5.0 V and has 5.0-V logic levels.

TLV803, TLV853, TLV863

SBVS157E – APRIL 2011 – REVISED DECEMBER 2020

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