Texas Instruments LM3704XCMMX-308/NOPB

Overview

LM3704XCMMX-308/NOPB from Texas Instruments is a microprocessor supervisory IC with 3.08V reset threshold, 200ms reset timeout period, totem-pole RESET output, and integrated power-fail comparator (PFI/PFO), low-line output (LLO), and manual reset (MR) input - used for reliable power-up/power-down monitoring in embedded controllers and critical µP systems.

For engineers reviewing the LM3704XCMMX-308/NOPB datasheet, LM3704XCMMX-308/NOPB pinout, LM3704XCMMX-308/NOPB application, or LM3704XCMMX-308/NOPB equivalent, this device delivers precision supply monitoring with ±0.5% room-temperature reset accuracy, operation down to 1.0V VCC, 28 µA quiescent current, and early brownout warning via LLO at 1.02×VRST.

Technical Context

The LM3704XCMMX-308/NOPB implements independent comparators for reset (3.08V threshold), power-fail (1.225V PFI reference), and low-line detection (VLLOT = 1.02×VRST), each with 0.0032×VRST hysteresis. Its internal timer enforces a factory-programmed 200ms reset timeout after VCC rise or MR release.

It features a dedicated MR input with 1.225V threshold and 56 kΩ internal pull-up, debounced with 12 µs delay and 25 µs minimum pulse width; RESET asserts low during VCC < 3.08V, MR < 1.225V, or brownout, and remains valid down to VCC = 1.0V.

Key Specifications

Pinout & Package

LM3704XCMMX-308/NOPB is packaged in a 9-bump micro SMD (NS Package Number BPA09FFB, 1.412 mm × 1.412 mm × 0.850 mm), optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326–308, LM3704XCMMX-308/NOPB uniquely integrates three independent voltage monitors (reset, PFI, LLO) in a 1.4 mm² micro SMD, enabling early fault prediction without adding discrete comparators or timers.

Availability

LM3704XCMMX-308/NOPB is available at Aetrix Electronics and suitable for embedded controllers, automotive body electronics, and medical portable devices requiring stable component supply, precise reset timing, and early power-fail warning capability.

Supply support for LM3704XCMMX-308/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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and microcontrollers.

The LM3704 series belongs to TI's precision supervisory IC portfolio, designed specifically for systems requiring multi-threshold voltage monitoring, manual reset, and predictive power-fail response without backup batteries.

FAQ

What is the reset timeout period for LM3704XCMMX-308/NOPB?

The LM3704XCMMX-308/NOPB has a factory-programmed reset timeout period of 200ms. This duration is guaranteed across temperature and supply voltage variations and defines the minimum time RESET remains asserted after VCC rises above 3.08V or after the MR input is released. It ensures full µP initialization before release and is not adjustable externally.

Does LM3704XCMMX-308/NOPB support operation below 1.8V VCC?

Yes, LM3704XCMMX-308/NOPB operates down to VCC = 1.0V and guarantees valid RESET assertion throughout this range. Its internal comparators and logic remain functional at 1.0V, making it suitable for ultra-low-power applications such as coin-cell-powered medical sensors where supply may decay below typical logic thresholds.

What is the function of the LLO pin on LM3704XCMMX-308/NOPB?

The LLO (Low-Line Output) pin on LM3704XCMMX-308/NOPB is an active-low early warning signal that asserts when VCC falls to 1.02×3.08V ≈ 3.14V - 2% above the 3.08V reset threshold. It provides deterministic advance notice of imminent brownout, enabling systems to trigger non-maskable interrupts for data save or controlled shutdown before RESET activates.

Can LM3704XCMMX-308/NOPB monitor a second supply voltage?

Yes, LM3704XCMMX-308/NOPB can monitor a second supply via its PFI (Power-Fail Input) pin, which compares an external voltage against a precise 1.225V internal reference. When the divided secondary supply drops below this threshold, PFO goes low - allowing independent tracking of unregulated rails, battery voltages, or auxiliary supplies without loading the main VCC path.

Is LM3704XCMMX-308/NOPB pin-compatible with other LM3704 variants?

LM3704XCMMX-308/NOPB shares the same 9-bump micro SMD package and pinout with all LM3704XCMMX-x variants (e.g., -263, -232). Pin functions - VCC, GND, RESET, MR, PFI, PFO, LLO, and NC - are identical across these variants; only reset threshold and timeout period differ, both factory-programmed and not user-modifiable.