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

TLV803, TLV853, TLV863

www.ti.com

SBVS157C – APRIL 2011 – REVISED SEPTEMBER 2015

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. Customers should

validate and test 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 11

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.

Figure 11. 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

useful logic levels of the load. Figure 12 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.

Copyright © 2011–2015, Texas Instruments Incorporated

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Product Folder Links: TLV803 TLV853 TLV863