Texas Instruments TPS386040RGPR

Overview

TPS386040RGPR from Texas Instruments is a quad supply voltage supervisor IC with adjustable delay and watchdog timer, featuring four independent monitoring channels (including one window comparator for SENSE4L/SENSE4H), 0.25% typical threshold accuracy, 11 μA typical quiescent current, and push-pull RESET/WDO outputs. It supports precise power-rail monitoring in FPGA, DSP, and microprocessor systems requiring reliable sequencing and fault detection.

For engineers reviewing the TPS386040RGPR datasheet, TPS386040RGPR pinout, TPS386040RGPR application, or TPS386040RGPR equivalent, key selection considerations include its 4-channel programmable supervision architecture, 1.4 ms–10 s adjustable reset delay per channel, negative-voltage sensing capability via VREF/SENSE4H, and push-pull output drive compatibility with 1.8–6.5 V supply rails.

Technical Context

The TPS386040RGPR implements four independent supervisory circuits (SVS-1 to SVS-4), each with externally programmable undervoltage thresholds down to 0.4 V using resistor dividers on SENSE pins. SVS-4 uniquely provides window-comparator functionality via dual inputs (SENSE4L for falling threshold, SENSE4H for rising threshold) and supports negative-rail monitoring when paired with the 1.2 V VREF output.

Each channel uses a dedicated CTn pin to set reset delay independently - from fixed values (CTn open or tied to VDD) to programmable ranges (capacitor to GND) - with timing characterized from –40°C to +125°C. The integrated watchdog timer features a 600 ms typical timeout period (tWDT), triggered by WDI edge transitions and asserting WDO upon timeout.

Key Specifications

Pinout & Package

TPS386040RGPR is housed in a 4-mm × 4-mm, 20-pin VQFN (RGP) package with exposed thermal pad. Pin assignment follows TI's standard RGP layout, optimized for thermal performance and PCB space efficiency in dense digital systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-supervisor applications.

Compared with TPS386000RGPR, TPS386040RGPR simplifies layout by removing pull-up components and improves noise immunity with defined logic levels; compared with MAX6812HEUT+T, it delivers four-fold supervision density, programmable thresholds, and watchdog functionality essential for complex digital systems.

Availability

TPS386040RGPR is available at Aetrix Electronics and suitable for FPGA power sequencing, DSP-based industrial controllers, telecom baseband units, and medical imaging signal processors requiring stable component supply and long-term production support.

Supply support for TPS386040RGPR 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability supervisory ICs.

The TPS3860x0 product line was designed specifically for multi-rail digital systems requiring precise, independent voltage monitoring, adjustable timing, and integrated watchdog functionality - targeting FPGA, ASIC, and DSP platforms.

FAQ

What is the function of the VREF pin on the TPS386040RGPR?

The VREF pin on the TPS386040RGPR provides a stable 1.20 V ±20 mV reference output used to configure SENSE4H for negative-voltage monitoring. When connected through a resistor divider to a negative rail (e.g., –3.3 V), VREF enables the window comparator to detect both over- and undervoltage faults on that rail. It is intended to source current only - do not connect to voltages above 1.2 V or use with capacitive loads alone.

How does the watchdog timer in the TPS386040RGPR operate?

The watchdog timer in the TPS386040RGPR is triggered by edges on the WDI pin and times out after 600 ms (typical). Each rising or falling edge resets the timer; failure to toggle WDI within this window asserts the WDO output low. The timer starts counting after RESET1 is released, ensuring firmware has initialized before watchdog enforcement begins. WDO is push-pull, providing a defined logic-low state without external components.

Can the TPS386040RGPR monitor a negative voltage rail?

Yes, the TPS386040RGPR can monitor a negative voltage rail using SENSE4H in combination with the VREF pin. By connecting a resistor divider between VREF (1.2 V) and the negative rail (e.g., –5 V), the voltage at SENSE4H becomes positive and proportional to the negative rail magnitude. This allows the window comparator to detect deviations from the target negative voltage - confirmed in TI's SBVS105F datasheet Figure 34 and Section 9.1.

What is the difference between TPS386040RGPR and TPS386000RGPR?

The TPS386040RGPR and TPS386000RGPR share identical supervision architecture, thresholds, timing, and pinout - differing only in output stage: TPS386040RGPR uses push-pull RESET/WDO outputs, while TPS386000RGPR uses open-drain outputs requiring external pull-up resistors. This makes TPS386040RGPR preferable for designs needing guaranteed logic levels and reduced component count.

What is the minimum supply voltage required for the TPS386040RGPR to operate correctly?

The TPS386040RGPR requires a minimum VDD of 1.8 V to operate within specifications, as defined in the Recommended Operating Conditions table (Section 6.3). Below 1.8 V, reset assertion behavior is not guaranteed - the power-up reset voltage is specified at 0.9 V, but full functionality (including accurate threshold detection and watchdog operation) is only ensured above 1.8 V.