Texas Instruments TPS3780CDRYT

Overview

TPS3780CDRYT from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features factory-set 10% hysteresis, ±1% VIT+ threshold accuracy over –40°C to 125°C, and 2 µA typical quiescent current. The device monitors two independent supply rails (e.g., 3.3 V and 3.0 V) and asserts active-low reset signals to microcontroller enable inputs.

For engineers reviewing the TPS3780CDRYT datasheet, TPS3780CDRYT pinout, TPS3780CDRYT application, or TPS3780CDRYT equivalent, this page delivers verified electrical specs, thermal behavior at 125°C, µSON-6 package dimensions, and design-critical timing parameters including 10 µs falling-edge propagation delay and 570 µs startup delay.

Technical Context

The TPS3780CDRYT implements two independent high-accuracy comparators with internal reference trimming-each with fixed 10% hysteresis (VHYS = 10% × VIT+) and separate SENSE1/SENSE2 inputs capable of swing up to 6.5 V regardless of VDD (1.5–6.5 V). Its open-drain outputs support level-shifting via external pull-ups up to 6.5 V, enabling interface with diverse logic families.

Operation relies on precise threshold crossing: OUT1/OUT2 assert low when respective SENSEx falls below VIT– (1.074 V nominal), and deassert high when SENSEx rises above VIT+ (1.194 V nominal). Temperature drift is tightly controlled: VIT+ deviation remains within ±0.4% across –40°C to 120°C, validated by production test data.

Key Specifications

Pinout & Package

TPS3780CDRYT is housed in a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks for automated optical inspection. Thermal resistance RθJA is 306.7°C/W, requiring minimal PCB copper area for 125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780BDRYT, the TPS3780CDRYT offers stronger noise immunity for noisy industrial rails; compared with MAX6326TT29D3+T, it reduces component count and PCB area by 33% while adding independent channel configuration and wider supply range.

Availability

TPS3780CDRYT is available at Aetrix Electronics and suitable for power-supply sequencing, solid-state drives, portable medical devices, building automation sensors, and early-warning detection systems requiring stable component supply across extended temperature ranges.

Supply support for TPS3780CDRYT 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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision analog ICs and power management.

The TPS37xx family was engineered specifically for high-accuracy, low-quiescent-current voltage supervision in space-constrained, battery-sensitive, and thermally demanding applications-from portable diagnostics to automotive infotainment power domains.

FAQ

What is the exact VIT+ threshold voltage for TPS3780CDRYT at 25°C?

The TPS3780CDRYT has a nominal VIT+ threshold of 1.194 V at 25°C, with ±1% accuracy across –40°C to 125°C. This value is factory-trimmed and applies to both SENSE1 and SENSE2 inputs. The 10% hysteresis yields a VIT– of 1.074 V, resulting in a guaranteed 120 mV window between assertion and deassertion points. This specification is confirmed in Section 7.5 of the SBVS250 datasheet.

Can TPS3780CDRYT monitor a 5 V rail while powered from a 1.8 V supply?

Yes, TPS3780CDRYT can monitor a 5 V rail with VDD = 1.8 V. Its SENSE1 and SENSE2 inputs tolerate voltages up to 6.5 V independent of VDD, enabling direct connection to higher-voltage rails via resistor dividers. For a 5 V rail, use a 3.16:1 divider (e.g., 2.16 MΩ + 1 MΩ) to scale 5 V down to 1.194 V at the SENSE pin. This capability is explicitly documented in Section 8.3.1 and Table 7.3 of the datasheet.

What pull-up resistor value is recommended for TPS3780CDRYT's open-drain outputs?

A 10 kΩ pull-up resistor is recommended for TPS3780CDRYT's OUT1 and OUT2 pins when interfacing with 3.3 V logic. This value ensures VOL ≤ 0.25 V at 0.4 mA sink current (per Section 7.5) while limiting static current to 330 µA. For 5 V logic, values between 4.7 kΩ and 10 kΩ maintain noise margin and meet VOL spec. The datasheet specifies RPU range as 1.5 kΩ to 10 kΩ in Section 7.3.

Does TPS3780CDRYT require an input capacitor on the SENSE pins?

TPS3780CDRYT does not require input capacitors on SENSE1 or SENSE2 pins for standard operation. However, in high-noise environments (e.g., motor drive proximity), a 1–10 nF ceramic capacitor placed directly at each SENSE pin reduces susceptibility to fast transients. This recommendation appears in Section 8.3.1 and is validated by Figure 16–19 transient duration vs. overdrive curves in the datasheet.

How does the 570 µs startup delay affect system reset timing in TPS3780CDRYT?

TPS3780CDRYT asserts valid output states 570 µs after VDD crosses VDD(min) (1.5 V), preventing premature reset release during power ramp-up. This fixed delay ensures the internal reference and comparators stabilize before monitoring begins. In systems with slow VDD rise times (<1 V/ms), the delay starts at the VDD(min) crossing point-not at power-on-so total reset hold time equals 570 µs plus any additional RC delay in the supply path, as defined in Section 7.6 and Figure 1.