Texas Instruments TPS3808G19DBVT

Overview

TPS3808G19DBVT from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.9-V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 1.77 V. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s via external capacitor on CT pin. Used in battery-powered microcontroller systems requiring precise power-on reset timing.

For engineers reviewing the TPS3808G19DBVT datasheet, TPS3808G19DBVT pinout, TPS3808G19DBVT application, or TPS3808G19DBVT equivalent, key selection criteria include its 1.77-V fixed threshold, SOT-23-6 package compatibility, −40°C to 125°C operating range, open-drain RESET output with 0.4-V VOL at 1 mA, and MR input with 90-kΩ internal pullup for manual reset initiation.

Technical Context

The TPS3808G19DBVT implements a precision bandgap reference and comparator architecture to achieve ±0.5% threshold accuracy for VIT ≤ 3.3 V. Its reset delay is controlled by an internal 220-nA current source charging an external capacitor on the CT pin, enabling programmable timeouts between 1.25 ms and 10 s.

It operates across 1.7–6.5 V supply range and supports dual reset triggers: SENSE voltage drop below 1.77 V or logic-low assertion on MR pin. The open-drain RESET output requires an external pullup (10 kΩ–1 MΩ) and tolerates voltages up to 6.5 V, decoupling reset signaling from VDD rail constraints.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant matte tin lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3808G19DBVT, TPS3808G18DBVT offers matching programmability but targets a lower rail, while MAX6326UT19D3+T trades flexibility for simplicity-making TPS3808G19DBVT optimal for 1.9-V systems needing both precision threshold and configurable reset timing.

Availability

TPS3808G19DBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered edge sensor nodes, FPGA configuration integrity, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges.

Supply support for TPS3808G19DBVT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS3808 family is engineered for high-accuracy, low-power system supervision-specifically targeting battery-constrained and thermally demanding applications where reliable reset generation is critical to functional safety.

FAQ

What is the exact threshold voltage of the TPS3808G19DBVT and how is it specified?

The TPS3808G19DBVT has a nominal threshold voltage (VIT) of 1.77 V, corresponding to a 1.9-V nominal supply rail. This value is factory-trimmed and specified with ±0.5% accuracy over −40°C to 125°C junction temperature for VIT ≤ 3.3 V. The device achieves this precision using an internal bandgap reference and laser-trimmed resistive divider, ensuring minimal drift across temperature and supply variations. TPS3808G19DBVT's 1.77-V point is documented in TI's SBVS050M datasheet Table 5.

Can the TPS3808G19DBVT be used to monitor voltages other than 1.9 V?

No-the TPS3808G19DBVT is a fixed-threshold variant optimized exclusively for 1.9-V rails (VIT = 1.77 V). To monitor other voltages, select alternate members of the TPS3808 family such as TPS3808G12 (1.12 V), TPS3808G33 (3.07 V), or the adjustable TPS3808G01 (down to 0.405 V). Using TPS3808G19DBVT outside its specified 1.9-V context risks incorrect reset assertion or failure to trigger under brownout conditions. TPS3808G19DBVT's internal threshold is not user-configurable.

What are the valid configurations for the CT pin on the TPS3808G19DBVT?

The CT pin on the TPS3808G19DBVT supports three validated configurations: (1) left open for 20-ms fixed delay, (2) connected to VDD via a 40–200-kΩ resistor for 300-ms fixed delay, or (3) connected to GND via a ≥100-pF capacitor for user-programmable delay from 1.25 ms to 10 s. Ceramic capacitors are recommended to minimize leakage. Stray capacitance on CT must be minimized-excess parasitic capacitance causes inaccurate delay timing. All configurations are explicitly verified in Section 8.3.2 of the TPS3808G19DBVT datasheet.

Does the TPS3808G19DBVT require an external pullup resistor on the RESET pin?

Yes-the TPS3808G19DBVT features an open-drain RESET output and requires an external pullup resistor between RESET and the target logic supply (e.g., 1.8 V, 3.3 V, or up to 6.5 V). TI recommends values from 10 kΩ to 1 MΩ; 100 kΩ is commonly used for noise immunity and speed tradeoff. Without this pullup, RESET cannot attain a valid high state, causing system boot failure. This requirement is inherent to the open-drain architecture and applies identically across all TPS3808G19DBVT units.

How does the MR pin function on the TPS3808G19DBVT and what is its internal pullup value?

The MR (manual reset) pin on the TPS3808G19DBVT is an active-low input that forces immediate RESET assertion when driven ≤0.3×VDD. It features a factory-trimmed 90-kΩ internal pullup resistor to VDD, allowing the pin to be left unconnected if manual reset is unused-no external components required. When MR is asserted, RESET remains low until both MR returns high and SENSE exceeds 1.77 V + hysteresis, followed by the full programmed delay. This behavior is confirmed in Table 6-1 and Section 8.3.3 of the TPS3808G19DBVT datasheet.