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TPS3823-33DBVRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS3823-33DBVRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page _ + RESET (1) RESET MR (2) WDI (3) Auto-Reset Oscillator Transition Detector Watchdog Timer Logic RESET Logic V REF V DD 52 kW 40 kW TPS3820, TPS3823, TPS3823A, TPS3824, TPS3825, TPS3828 SLVS165K – APRIL 1998 – REVISED NOVEMBER 2015 www.ti.com 8 Detailed Description 8.1 Overview The TPS382x family of supervisors provide circuit initialization and timing supervision. Optional configurations include devices with active-high and active-low output signals (TPS3824/5), devices with a watchdog timer (TPS3820/3/4/8), and devices with manual reset (MR) pins (TPS3820/3/5/8). RESET asserts when the supply voltage, VDD, rises above 1.1 V. For devices with active-low output logic, the device monitors VDD and keeps RESET low as long as VDD remains below the negative threshold voltage, VIT−. For devices with active-high output logic, RESET remains high as long as VDD remains below VIT−. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td, starts after VDD rises above the positive threshold voltage (VIT− + VHYS). When the supply voltage drops below VIT−, the output becomes active (low) again. All the devices of this family have a fixed-sense threshold voltage, VIT–, set by an internal voltage divider, so no external components are required. The TPS382x family is designed to monitor supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The devices are available in a 5-pin SOT-23 package and are characterized for operation over a temperature range of −40°C to 85°C. 8.2 Functional Block Diagram (1) TPS3824/5 (2) TPS3820/3/5/8 (3) TPS3820/3/4/8 8.3 Feature Description 8.3.1 Manual Reset (MR) The MR input allows an external logic signal from processors, logic circuits, and/or discrete sensors to force a reset signal regardless of VDD with respect to VIT– or the state of the watchdog timer. A low level at MR causes the reset signals to become active. 8.3.2 Active High or Active Low Output All TPS382x devices have an active-low logic output (RESET), while the TPS3824/5 devices also include an active-high logic output (RESET). 8.3.3 Push-Pull or Open-Drain Output All TPS382x devices, except for TPS3828, have push-pull outputs. TPS3828 devices have an open-drain output. 10 Submit Documentation Feedback Copyright © 1998–2015, Texas Instruments Incorporated Product Folder Links: TPS3820 TPS3823 TPS3824 TPS3825 TPS3828 |
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