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TLV803S Datasheet(PDF) 7 Page - Texas Instruments |
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TLV803S Datasheet(HTML) 7 Page - Texas Instruments |
7 / 15 page 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 100kW TLV803S V DD 3.3V RESET GND 47kW RST Microprocessor V CC TLV803M, TLV803R TLV803S, TLV803Z www.ti.com SBVS157A – APRIL 2011 – REVISED JUNE 2011 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 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 9. Multiple Voltage Rail Monitoring BIDIRECTIONAL RESET PINS Some microcontrollers have bidirectional reset pins that act as both inputs and outputs. In a situation where the TLV803 is pulling the RESET line low while the microcontroller is trying the force the RESET line high, a series resistor should be placed between the output of the TLV803 and the RESET pin of the microcontroller to protect against excessive current flow. Figure 10 shows the connection of the TLV803 to a microcontroller using a series resistor to drive a bidirectional RESET line. Figure 10. Connection to Bidirectional Reset Pin Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): TLV803M TLV803R TLV803S TLV803Z |
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