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TPS3839A09DQNT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS3839A09DQNT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page Transient Duration (t ) W Transient Amplitude V DD V IT- Delay V REF VDD GND RESET MR ( Only) TPS3831 VDD TPS3831, TPS3839 www.ti.com SBVS193D – JUNE 2012 – REVISED JULY 2015 8 Detailed Description 8.1 Overview The TPS3831 and TPS3839 are ultralow current voltage supervisory circuits that monitor the input supply voltage of these devices. Both devices assert an active-low reset whenever the VDD supply voltage drops below the negative-going threshold voltage (VIT–). The output, RESET, remains asserted for approximately 200 ms after the VDD voltage rises above the positive-going threshold voltage (VIT– + Vhys). These devices are designed to ignore fast transients on the VDD pin. The TPS3831 device includes a manual reset input (MR) that can be used to force the RESET signal low, even if the supply voltage is above VIT–. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 VDD Transient Rejection The TPS383x (TPS3831 and TPS3839) devices have built-in rejection of fast transients on the VDD pin. Transient rejection depends on both the duration and amplitude of the transient. Transient amplitude is measured from the bottom of the transient to the negative threshold voltage (VIT–) of the device, as shown in Figure 12. Figure 12. Voltage Transient Measurement Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 |
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