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TPS3780ADRYT Datasheet(PDF) 7 Page - Texas Instruments |
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TPS3780ADRYT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 17 page V IT+ V IT- t pd(r) VCC SENSEx OUTx V (POR) t pd(f) Hysteresis TPS3779 TPS3780 www.ti.com SBVS216B – SEPTEMBER 2012 – REVISED MAY 2013 DETAILED DESCRIPTION OVERVIEW The TPS3779 and TPS3780 belong to a family of ultrasmall, low quiescent current (ICC), dual-channel voltage detectors. These devices have high-accuracy, rising and falling input thresholds, and assert the output as shown in Table 1. The output (OUTx pin) goes low when the SENSEx pin is less than VIT– and goes high when the pin is greater than VIT+. The TPS3779 and TPS3780 offer multiple hysteresis options from 0.5% to 10% for use in wide variety of applications. These devices have two independent voltage detection channels that can be used in systems where multiple voltage rails are required to be monitored, or where one channel can be used as an early warning signal and the other channel used as the system reset signal. Table 1. TPS33779, TPS3780 Truth Table CONDITIONS OUTPUT SENSE1 < VIT– OUT1 = low SENSE2 < VIT– OUT2 = low SENSE1 > VIT+ OUT1 = high SENSE2 > VIT+ OUT2 = high INPUTS (SENSE1, SENSE2) The TPS3779 and TPS3780 have two comparators for voltage detection. Each comparator has one external input; the other input is connected to the internal reference. The comparator rising threshold is designed and trimmed to be equal to VIT+ and the falling threshold is trimmed to be equal to VIT–. The built-in falling hysteresis options make the devices immune to supply rail noise and ensures stable operation. The comparator inputs can swing from ground to 6.5 V, regardless of the device supply voltage used. Although not required in most cases, it is good analog design practice to place a 1-nF to 10-nF bypass capacitor at the comparator input for extremely noisy applications in order to reduce sensitivity to transients and layout parasitic. For each SENSE input, the corresponding output (OUTx) is driven to logic low when the input voltage drops below VIT–. When the voltage exceeds VIT+, the output (OUTx) goes to a high-impedance state, as shown in Figure 13. Figure 13. Timing Diagram Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS3779 TPS3780 |
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