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TPS3420DDRYR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS3420DDRYR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page V DD VCC PB1 RST GND Reset Microprocessor Device PB2 V = 1.6 V to 6.5 V IN TS + GPIO GPIO Push-Button Switch 2 Push-Button Switch 1 TPS3420 TPS3421 TPS3422 www.ti.com SBVS211A – AUGUST 2012 – REVISED MARCH 2013 DETAILED DESCRIPTION OVERVIEW The TPS342x are a family of push-button reset devices with an extended setup period that prevents resets from occurring as a result of short-duration switch closures. See the Device Family Options table for details. The TPS3420 is a dual-channel device with an output that asserts when both inputs (PB1 and PB2) are held low for the push-button timer duration, and deasserts when either input PBx is released. The TPS3421 is a dual-channel device with an output that asserts when both inputs (PB1 and PB2) are held low for the push-button timer duration, and deasserts after the reset timeout duration. TPS3422 is a single-channel device with an output that asserts when the PB1 input is held low for the push- button timer duration, and deasserts after the reset timeout duration. The TPS342x family also has a TS pin that selects between two different push-button timing options by connecting the pin to either GND or VCC. DEVICE INPUTS This section describes the input of the TPS342x devices. TPS3420 Inputs (PB1, PB2) The TPS3420 has two NMOS-based threshold inputs (PB1, PB2) with a VIH ≥ 0.85 V, and a VIL ≤ 0.3 V. When input conditions are met (that is, when both inputs are simultaneously held low for the push-button timer period, ttimer), the device asserts a reset low, as shown in Figure 1. Reset deassertion occurs when either input goes high. The reset pulse occurs only one time after each valid input condition. At least one input pin must be released (goes high) and then driven low for the ttimer period before RST asserts again. An application diagram is shown in Figure 14. NOTE: Connect TS to VCC or ground for different PB time delays. Connect one PB input to ground for use as a single channel. Figure 14. TPS3420 Application Diagram Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS3420 TPS3421 TPS3422 |
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