Texas Instruments TLV840CADL14DBVR

Overview

TLV840CADL14DBVR from Texas Instruments is a nano-power ultra-low-voltage supervisor IC with adjustable reset time delay, fixed 1.4 V negative threshold voltage (VIT−), ±0.5% typical accuracy, 120 nA typical supply current, and open-drain active-low RESET output. It monitors power rails in battery-powered microcontroller systems requiring precise brownout detection and controlled reset assertion.

For engineers reviewing the TLV840CADL14DBVR datasheet, TLV840CADL14DBVR pinout, TLV840CADL14DBVR application, or TLV840CADL14DBVR equivalent, key selection considerations include its 0.7–6 V operating range, capacitor-programmable reset delay (40 µs minimum), –40°C to +125°C temperature rating, SOT-23-5 package, and compatibility with low-voltage logic interfaces.

Technical Context

The TLV840CADL14DBVR implements a precision bandgap-based comparator with built-in 5% typical hysteresis (VHYS) to prevent false resets during supply transients. Its internal timer circuit uses the CT pin to set reset delay via external capacitor, enabling programmable tD from 40 µs to >600 ms.

It operates in two functional states: reset assertion when VDD falls below 1.4 V (VIT−), and reset deassertion after VDD rises above 1.47 V (VIT− + VHYS) and the programmed tD expires. Glitch immunity of 10 µs at 5% VIT− overdrive ensures robustness against short supply dips.

Key Specifications

Pinout & Package

Package: SOT-23-5 (DBV), 2.90 mm × 1.60 mm body size, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV840CADL14DBVR, TPS3840DL14DBVR trades 3× higher supply current for simplified fixed-delay implementation, while MAX6375LKA14+T offers higher output drive but sacrifices nano-power operation and threshold precision - making TLV840CADL14DBVR optimal for energy-constrained, accuracy-critical, and timing-flexible designs.

Availability

TLV840CADL14DBVR is available at Aetrix Electronics and suitable for motor drives, factory automation controllers, and data center SSDs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLV840CADL14DBVR 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 precision voltage monitoring and low-power IC design.

The TLV840 family was engineered specifically for ultra-low-power industrial and battery-operated systems needing high-accuracy, capacitor-programmable reset supervision - addressing gaps in legacy supervisors' current consumption and timing flexibility.

FAQ

What is the exact threshold voltage of TLV840CADL14DBVR?

The TLV840CADL14DBVR has a factory-trimmed negative input threshold voltage (VIT−) of 1.4 V with ±0.5% typical accuracy across –40°C to +125°C. This value is fixed and non-adjustable; the "14" in the part number explicitly denotes the 1.4 V variant. Accuracy remains stable over temperature and supply voltage due to internal bandgap referencing and trimming.

Does TLV840CADL14DBVR support manual reset functionality?

No, TLV840CADL14DBVR does not include a manual reset (MR) pin. The "C" in the part number indicates capacitor-programmable delay (CT pin), while "M" would denote MR support. TLV840CADL14DBVR has pin 4 designated as NC (no-connect), confirming absence of MR functionality. Reset is triggered solely by VDD falling below 1.4 V or by external assertion via CT-controlled timing.

What is the minimum reset delay achievable with TLV840CADL14DBVR?

The minimum reset delay for TLV840CADL14DBVR is 40 µs (typical), achieved by leaving the CT pin floating. This is the fixed baseline delay for all TLV840C variants. No external capacitor is required to achieve this value; adding capacitance increases delay per tD = 618937 × CCT + 80 µs, where CCT is in farads.

Can TLV840CADL14DBVR monitor a 0.9 V supply rail?

No, TLV840CADL14DBVR cannot reliably monitor a 0.9 V rail because its VIT− is fixed at 1.4 V. For sub-1.4 V rails, select a different TLV840 variant - e.g., TLV840CADL09DBVR (0.9 V threshold) or TLV840CADL10DBVR (1.0 V). The device requires VDD ≥ VPOR (700 mV) to operate, but valid supervision only occurs above VIT−.

Is an external pull-up resistor required for TLV840CADL14DBVR's RESET pin?

Yes, TLV840CADL14DBVR uses an open-drain active-low RESET output ("DL" suffix), so an external pull-up resistor is mandatory to establish a defined high state. The resistor can connect to any voltage up to 6.5 V (independent of VDD), and typical values range from 10 kΩ to 100 kΩ depending on VOL and sink current requirements - e.g., 40 kΩ ensures VOL ≤ 300 mV at 15 µA sink.