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TPS3808G25DRVRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS3808G25DRVRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page TPS3808G01 Adjustable Version V DD V DD 90 kW MR SENSE RESET C T GND 0.4 V V REF Reset Logic Timer Fixed Voltage Version Adjustable Voltage Version V DD V DD 90 kW MR SENSE RESET C T GND 0.4 V V REF Reset Logic Timer R 2 R 1 R + R = 4 M 1 2 W 10 TPS3808 SBVS050K – MAY 2004 – REVISED OCTOBER 2015 www.ti.com Product Folder Links: TPS3808 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS3808 microprocessor supervisory product family is designed to assert a RESET signal when either the SENSE pin voltage drops below VIT or the manual reset (MR) is driven low. The RESET output remains asserted for a user-adjustable time after both the manual reset (MR) and SENSE voltages return above their respective thresholds. 8.2 Functional Block Diagram 8.3 Feature Description A broad range of voltage threshold and reset delay time adjustments are available for the TPS3808 device, allowing these devices to be used in a wide array of applications. Reset threshold voltages can be factory-set from 0.82 V to 3.3 V or from 4.4 V to 5 V, while the TPS3808G01 can be set to any voltage above 0.405 V using an external resistor divider. Two preset delay times are also user-selectable: connecting the CT pin to VDD results in a 300-ms reset delay, whereas leaving the CT pin open yields a 20-ms reset delay. In addition, connecting a capacitor between CT and GND allows the designer to select any reset delay period from 1.25 ms to 10 s. 8.3.1 SENSE Input The SENSE input provides a pin at which any system voltage can be monitored. If the voltage on this pin drops below VIT, then RESET is asserted. The comparator has a built-in hysteresis to ensure smooth RESET assertions and de-assertions. It is good analog design practice to put a 1-nF to 10-nF bypass capacitor on the SENSE input to reduce sensitivity to transients and layout parasitics. The TPS3808 device is relatively immune to short negative transients on the SENSE pin. Sensitivity to transients is dependent on threshold overdrive, as shown in (Figure 5). The TPS3808G01 can be used to monitor any voltage rail down to 0.405 V using the circuit shown in Figure 9. |
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