Texas Instruments LM3723IM5-2.32/NOPB

Overview

LM3723IM5-2.32/NOPB from Texas Instruments is an active-high microprocessor reset supervisor IC designed for 2.5V supply monitoring in embedded systems. It provides a factory-trimmed 2.32V reset threshold, 190ms typical reset timeout, guaranteed RESET validity down to VCC ≥1V, and operates across −40°C to +85°C. It is used in portable battery-powered equipment to prevent code execution errors during power-up, brown-out, or manual reset events.

For engineers reviewing the LM3723IM5-2.32/NOPB datasheet, LM3723IM5-2.32/NOPB pinout, LM3723IM5-2.32/NOPB application, or LM3723IM5-2.32/NOPB equivalent, key selection considerations include its active-high push-pull output, precise 2.32V threshold for 2.5V rails, low 6µA supply current, SOT-23-5 package compatibility, and industrial temperature range support.

Technical Context

The LM3723IM5-2.32/NOPB integrates a precision voltage reference (1.225V), dual comparators (reset and manual reset), and a one-shot timer to generate a fixed-duration active-high reset pulse. Its internal architecture ensures immunity to short VCC transients (<40µs at 125mV overdrive) and MR input glitches <100ns.

It features a built-in 22kΩ MR pull-up resistor, supports manual reset assertion via MR pin with 2µs propagation delay, and maintains reset assertion for ≥100ms after VCC rises above threshold - with 190ms typical timeout. Output drive capability is specified up to 500µA source current at VCC > VTH max.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 1.6mm × 1.15mm body, gull-wing leads, RoHS-compliant green finish, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TEUS+T and TPS3808G125DBVR, the LM3723IM5-2.32/NOPB delivers exact 2.32V threshold matching 2.5V systems, zero-external-component active-high drive, and optimized 6µA ICC - making it the most direct functional fit for industrial 2.5V microcontroller supervision without redesign.

Availability

LM3723IM5-2.32/NOPB is available at Aetrix Electronics and suitable for microprocessor systems, portable/battery-powered equipment, and industrial controllers requiring stable component supply and long-term lifecycle continuity.

Supply support for LM3723IM5-2.32/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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.

The LM372x family was designed specifically for cost-sensitive, space-constrained microprocessor supervisory applications requiring precision voltage thresholds, low quiescent current, and robust transient immunity in SOT-23-5 packaging.

FAQ

What is the reset threshold voltage of the LM3723IM5-2.32/NOPB?

The LM3723IM5-2.32/NOPB has a factory-programmed reset threshold of 2.32V ±10mV, optimized for monitoring 2.5V nominal power supplies. This value is trimmed during production and guaranteed over the full −40°C to +85°C operating temperature range. The LM3723IM5-2.32/NOPB uses an internal 1.225V reference and precision resistor ladder to achieve this accuracy without external components.

Does the LM3723IM5-2.32/NOPB require an external pull-up resistor on its RESET pin?

No, the LM3723IM5-2.32/NOPB does not require an external pull-up resistor because it features an active-high push-pull output. The RESET pin drives high during normal operation and actively pulls low during reset assertion. This eliminates the need for external biasing and ensures fast, deterministic transitions - a key advantage over open-drain alternatives like the LM3724. The LM3723IM5-2.32/NOPB is therefore ideal for direct connection to microprocessor reset inputs.

What is the minimum VCC voltage at which the LM3723IM5-2.32/NOPB guarantees valid RESET output?

The LM3723IM5-2.32/NOPB guarantees valid RESET output for VCC ≥1V. Below 1V, the internal circuitry cannot maintain specified VOH/VOL performance, though the device remains functional. This specification ensures reliable reset behavior during deep brown-out conditions common in battery-powered systems. The LM3723IM5-2.32/NOPB's ability to assert RESET down to 1V makes it suitable for applications where supply collapse must be detected early and deterministically.

How does the manual reset (MR) function work on the LM3723IM5-2.32/NOPB?

The MR pin on the LM3723IM5-2.32/NOPB is an active-low input with an internal 22kΩ pull-up to VCC. Pulling MR below 0.25×VCC for >10µs asserts RESET after a 2µs propagation delay. RESET remains active while MR is held low and releases only after MR rises above 0.7×VCC and the 190ms internal timer expires. This debounced, glitch-immune design allows direct switch-to-ground connection without external RC filtering - a feature confirmed in the LM3723IM5-2.32/NOPB datasheet timing diagrams and electrical characteristics table.

Is the LM3723IM5-2.32/NOPB compatible with MAX811/812-based designs?

The LM3723IM5-2.32/NOPB is functionally compatible with MAX811/812 applications in terms of core supervision functionality - including power-on reset, brown-out detection, and manual reset - but differs in threshold (2.32V vs. 2.93V/4.63V), output polarity (active-high vs. active-low), and supply current (6µA vs. ~14µA). While not pin-for-pin or drop-in compatible, the LM3723IM5-2.32/NOPB serves as a direct functional alternative for 2.5V rail monitoring where active-high signaling is preferred, as explicitly stated in the TI datasheet Applications section.