Texas Instruments TPS3780CDRYR

Overview

TPS3780CDRYR from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 1% threshold accuracy (VIT+ = 1.182 V), 10% hysteresis, 2 µA typical quiescent current, and operates across 1.5 V to 6.5 V supply and –40°C to 125°C temperature range. It is used to assert reset or enable signals when monitored rails (e.g., 3.3 V and 3.0 V) fall below programmable thresholds.

For engineers reviewing the TPS3780CDRYR datasheet, TPS3780CDRYR pinout, TPS3780CDRYR application, or TPS3780CDRYR equivalent, key selection considerations include its open-drain output architecture enabling independent pull-up voltage (up to 6.5 V), adjustable detection down to 1.2 V via external resistor dividers, and guaranteed performance over automotive-grade temperature extremes.

Technical Context

The TPS3780CDRYR implements two independent high-accuracy comparators with internal reference trimming-each with rising threshold (VIT+) and falling threshold (VIT–) separated by factory-set 10% hysteresis. Its SENSE1/SENSE2 inputs accept voltages up to 6.5 V regardless of VDD, supporting rail monitoring where sensed voltage exceeds supply.

It uses open-drain outputs (OUT1/OUT2) requiring external pull-up resistors; these outputs can be pulled up to 6.5 V independently of VDD, enabling level-shifting and wired-AND logic. Startup delay is fixed at 570 µs after VDD crosses VDD(min), and propagation delays are 5.5 µs (rising) and 10 µs (falling).

Key Specifications

Pinout & Package

TPS3780CDRYR is housed in a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel voltage detector applications.

Compared with TPS3780BDRYR and TPS3779CDRYR, the TPS3780CDRYR uniquely balances maximum noise immunity (10% hysteresis) with flexible interfacing (open-drain + 6.5 V pull-up), making it optimal for ruggedized, multi-rail systems where reliability and voltage-level independence are critical.

Availability

TPS3780CDRYR is available at Aetrix Electronics and suitable for power-supply sequencing, early-warning detection, solid-state drive supervision, and industrial PLC voltage monitoring requiring stable component supply across extended temperature ranges.

Supply support for TPS3780CDRYR 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 automotive and industrial qualification expertise.

The TPS37xx family was engineered specifically for high-accuracy, ultra-low-power dual-rail monitoring in space-constrained, battery-sensitive, and thermally demanding applications-from portable medical gear to automotive body electronics.

FAQ

What is the exact VIT+ threshold voltage for TPS3780CDRYR?

The TPS3780CDRYR has a factory-trimmed positive-going input threshold (VIT+) of 1.182 V with ±1% accuracy over –40°C to 125°C. This value corresponds to the "D" variant in the TPS3780 family and is specified in the Electrical Characteristics table of the SBVS250 datasheet. The actual threshold remains stable across its full 1.5 V to 6.5 V supply range and is unaffected by VDD variation.

Does TPS3780CDRYR require external pull-up resistors on OUT1 and OUT2?

Yes, TPS3780CDRYR requires external pull-up resistors on both OUT1 and OUT2 because it features open-drain outputs. These resistors must connect to a valid logic-high voltage (up to 6.5 V), which may differ from VDD. Typical values range from 1.5 kΩ to 10 kΩ depending on sink current and rise-time requirements; the datasheet specifies RPU = 1.5–10,000 kΩ under Recommended Operating Conditions.

Can TPS3780CDRYR monitor a 5 V rail while powered from a 3.3 V supply?

Yes, TPS3780CDRYR can monitor a 5 V rail while operating from a 3.3 V VDD supply. Its SENSE1 and SENSE2 inputs tolerate voltages up to 6.5 V regardless of VDD level. A resistor divider scales the 5 V rail to ≤1.182 V at the SENSE pin, and the open-drain outputs can be pulled up to 5 V independently-enabling true mixed-voltage supervision without level shifters.

What is the startup behavior of TPS3780CDRYR after power application?

Upon VDD ramping above VDD(min), TPS3780CDRYR enters a 570 µs startup delay before outputs respond to SENSE inputs. During this period, OUT1 and OUT2 remain in high-impedance (open-drain) state. After delay completion, outputs assert based on instantaneous SENSE voltage relative to VIT–/VIT+. This prevents spurious resets during power-up transients and ensures reliable initialization.

How does the 10% hysteresis in TPS3780CDRYR improve system reliability?

The 10% hysteresis in TPS3780CDRYR sets VIT– = 1.074 V (10% below VIT+ = 1.182 V), creating a 108 mV noise margin. This prevents output chatter during rail ripple or EMI-induced dips near the threshold-critical in noisy environments like motor drives or switch-mode power supplies. Unlike software-based debounce, this hardware hysteresis is guaranteed across temperature and supply voltage.