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TPS3823-25DBVTG4 Datasheet(PDF) 2 Page - Texas Instruments |
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TPS3823-25DBVTG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 20 page WDI RESET TPS3824 WDI External TPS382x-xx TPS382xA-xx SLVS165J – APRIL 1998 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION (CONTINUED) The TPS3820/3/5/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS3824/5 devices include a high-level output RESET. TPS3820/3/4/8 have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET becomes active for the time period td. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. In applications where the input to the WDI pin may be active (transitioning high and low) when the TPS3820/3/4/8 is asserting RESET, the TPS3820/3/4/8 does not return to a non-reset state when the input voltage is above VT. If the application requires that input to WDI is active when RESET pin is asserted, then the “A” version of the device should be used. The “A” versions will not latch the RESET to the asserted state if a WDI pulse is received while RESET is asserted. Figure 1 shows how to decouple WDI from the active signal using when using the non −”A” version. This is accomplished with an N −Channel FET in series with the WDI pin, with the gate of the FET connected to the RESET output. The “A” version of the device does not need this FET but will operate in circuits that have it. Therefore, the “A” version is backward compatible with the non’”A” versions. Figure 1. The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in an SOT23-5 package. The TPS382x devices are characterized for operation over a temperature range of −40°C to 85°C. PACKAGE INFORMATION(1) DEVICE NAME(2) DEVICE NAME(3) THRESHOLD VOLTAGE(4) MARKING TPS3820-33DBVT TPS3820-33DBVR 2.93 V PDEI TPS3820-50DBVT TPS3820-50DBVR 4.55 V PDDI TPS3823-25DBVT TPS3823-25DBVR 2.25 V PAPI TPS3823-30DBVT TPS3823-30DBVR 2.63 V PAQI TPS3823-33DBVT TPS3823-33DBVR 2.93 V PARI TPS3823-50DBVT TPS3823-50DBVR 4.55 V PASI TPS3824-25DBVT TPS3824-25DBVR 2.25 V PATI TPS3824-30DBVT TPS3824-30DBVR 2.63 V PAUI TPS3824-33DBVT TPS3824-33DBVR 2.93 V PAVI TPS3824-50DBVT TPS3824-50DBVR 4.55 V PAWI TPS3825-33DBVT TPS3825-33DBVR 2.93 V PDGI TPS3825-50DBVT TPS3825-50DBVR 4.55 V PDFI TPS3828-33DBVT TPS3828-33DBVR 2.93 V PDII TPS3828-50DBVT TPS3828-50DBVR 4.55 V PDHI TPS3823A-33DBVT TPS3823A-33DBVR 2.93 V PYPI (1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. (2) The DBVT package indicates tape and reel of 250 parts. (3) The DBVR package indicates tape and reel of 3000 parts. (4) For other threshold voltage versions, please contact the local TI sales office. 2 Submit Documentation Feedback Copyright © 1998–2013, Texas Instruments Incorporated Product Folder Links: TPS382x-xx TPS382xA-xx |
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