Texas Instruments LM3722IM5-2.32/NOPB

Overview

LM3722IM5-2.32/NOPB from Texas Instruments is a precision 5-pin SOT-23 microprocessor reset supervisor IC with active-low push-pull RESET output, 2.32 V ±1.5% factory-trimmed threshold, 190 ms typical reset timeout, and guaranteed operation down to VCC ≥1 V. It monitors 2.5 V nominal supplies in embedded controllers and portable equipment requiring reliable power-on/brown-out reset assertion.

For engineers reviewing the LM3722IM5-2.32/NOPB datasheet, LM3722IM5-2.32/NOPB pinout, LM3722IM5-2.32/NOPB application, or LM3722IM5-2.32/NOPB equivalent, key selection considerations include reset threshold accuracy over temperature (±30 ppm/°C), manual reset debouncing with 22 kΩ internal pull-up, low 6 µA supply current at 2.5 V, and compatibility with MAX811/812-based designs.

Technical Context

The LM3722IM5-2.32/NOPB integrates a precision bandgap reference (1.225 V), dual comparators (low-line and manual reset), one-shot timer, and push-pull output stage. Its reset assertion logic guarantees minimum 100 ms active duration after VCC rises above 2.32 V, with typical 190 ms timeout and immunity to transients ≤100 ns on MR or ≤40 µs at 125 mV below threshold.

It operates across −40°C to +85°C (industrial grade), supports VCC from 1.0 V to 5.5 V, and maintains valid RESET output down to VCC = 1 V - enabling robust initialization in battery-backed or low-voltage systems where supply sequencing must be tightly controlled before microprocessor release.

Key Specifications

Pinout & Package

LM3722IM5-2.32/NOPB uses the industry-standard 5-pin SOT-23 (DBV) package, measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and RoHS-compliant Cu-Sn finish (Level-1 MSL).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX811TEUS+T and TPS3808G125DBVR, LM3722IM5-2.32/NOPB uniquely combines guaranteed 1 V operation, factory-trimmed 2.32 V threshold with ±1.5% accuracy, and integrated push-pull output - making it optimal for space-constrained 2.5 V systems demanding minimal BOM count and robust low-voltage reset behavior.

Availability

LM3722IM5-2.32/NOPB is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, automotive body control units, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM3722IM5-2.32/NOPB 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 connectivity technologies, with decades of expertise in power management and system supervision ICs.

The LM3722 series belongs to TI's precision voltage supervisor product line, engineered specifically for reliable microprocessor reset generation in cost-sensitive, space-constrained applications where accuracy, low power, and industrial temperature operation are critical.

FAQ

What is the exact reset threshold voltage of LM3722IM5-2.32/NOPB and how is it specified?

The LM3722IM5-2.32/NOPB has a factory-trimmed reset threshold of 2.32 V, with a tolerance of ±1.5% over the full industrial temperature range (−40°C to +85°C). This value is guaranteed per Electrical Characteristics table in the SNVS154E datasheet, and applies specifically to the LM3722IM5-2.32/NOPB variant - not to other members of the LM3722/LM3723/LM3724 family. The 2.32 V threshold is optimized for monitoring 2.5 V nominal supplies.

Does LM3722IM5-2.32/NOPB support operation below 1.5 V, and what happens to RESET output at low VCC?

Yes, LM3722IM5-2.32/NOPB guarantees valid RESET output functionality down to VCC ≥1 V, as explicitly stated in the datasheet's Electrical Characteristics and Applications Information sections. Below 1 V, the RESET output may not sink rated current, but for VCC ≥1 V, the active-low push-pull output remains fully functional - a key differentiator versus many competing supervisors that require ≥1.2 V or higher.

What is the function of Pin 2 (GND) on LM3722IM5-2.32/NOPB, and why are there two GND pins?

Pin 2 on LM3722IM5-2.32/NOPB is a dedicated ground terminal connected to the device substrate, as defined in the PIN DESCRIPTIONS section of SNVS154E. It serves both electrical reference and thermal conduction functions. The dual-GND configuration (Pins 1 and 2) reduces ground impedance and improves noise immunity in noisy industrial or automotive environments - a design feature confirmed in the Connection Diagram and Absolute Maximum Ratings tables.

How does the manual reset (MR) input of LM3722IM5-2.32/NOPB behave, and is an external pull-up required?

The MR input of LM3722IM5-2.32/NOPB includes an internal 22 kΩ pull-up resistor to VCC, as documented in the Electrical Characteristics table under "MR Pull-Up Resistance". No external pull-up is required - a simple momentary switch to ground suffices. MR is debounced, accepts pulses as short as 10 µs, and triggers reset after a 2 µs propagation delay, with reset remaining active until MR returns high and the 190 ms timeout expires.

Is LM3722IM5-2.32/NOPB pin-compatible with MAX811 or other legacy reset ICs?

LM3722IM5-2.32/NOPB is compatible with MAX811/812 applications per the datasheet's FEATURES section, but it is not pin-to-pin identical: MAX811 uses SOT-23-5 with Pin 3 = RESET and Pin 4 = GND, whereas LM3722IM5-2.32/NOPB assigns Pin 3 = RESET and Pin 4 = MR. Layout adaptation is required. However, the functional equivalence - including 2.32 V threshold, active-low output, and SOT-23 footprint - makes LM3722IM5-2.32/NOPB a direct functional replacement in most designs.