Analog Devices Inc. LTC2904ITS8#TRMPBF

Overview

LTC2904ITS8#TRMPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with pin-selectable thresholds, designed for systems requiring simultaneous monitoring of two independent voltage rails. It features ±1.5% threshold accuracy over –40°C to +85°C, 200ms fixed reset delay, open-drain RST output guaranteed functional down to 1V input, and nine programmable voltage combinations (e.g., 5V/3.3V, 3.3V/1.2V). It is used in industrial embedded controllers where reliable power-up sequencing and brownout detection are critical.

For engineers reviewing the LTC2904ITS8#TRMPBF datasheet, LTC2904ITS8#TRMPBF pinout, LTC2904ITS8#TRMPBF application, or LTC2904ITS8#TRMPBF equivalent, key selection considerations include its fixed 200ms reset timeout, TSOT-23-8 package footprint, tolerance programming via TOL/S1/S2 pins, guaranteed RST operation at V1 ≥ 1V or V2 ≥ 1V, and compatibility with 5%, 7.5%, or 10% supply tolerances without external components.

Technical Context

The LTC2904ITS8#TRMPBF implements a dual-input comparator architecture with internal bandgap reference and resistor network decoding. Its three-state programming inputs (S1, S2, TOL) configure both voltage thresholds and common tolerance level, eliminating external resistors. The device uses internal VCC auto-select-taking the higher of V1 or V2 as its supply-enabling operation even when one rail is absent.

Reset assertion is glitch-immune due to integrated low-pass filtering at the comparator output and a 200ms monostable timer. The open-drain RST output has strong pull-down (≤0.4V at 2.5mA) and weak internal pull-up (~6μA), supporting wired-OR configurations and ensuring correct logic state during power transitions down to 1V on either monitored rail.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (0.65mm pitch), 2.9mm × 1.6mm body, 1.0mm max height. Exposed pad not present; pin 1 marked by bevelled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply monitoring applications.

Compared with MAX6816EUT+T and TPS3808G33DBVR, the LTC2904ITS8#TRMPBF uniquely delivers true dual-rail monitoring with factory-trimmed ±1.5% accuracy, zero-component threshold/tolerance programming, and guaranteed operation down to 1V-making it optimal for space-constrained, multi-rail industrial systems where reliability and BOM simplification are critical.

Availability

LTC2904ITS8#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial embedded controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2904ITS8#TRMPBF 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

Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, including high-reliability supervisors and power management ICs for industrial, automotive, and communications markets.

The LTC2904ITS8#TRMPBF belongs to Linear's LTC290x dual-supply monitor family, engineered specifically for systems demanding accurate, low-power, and component-free voltage supervision across multiple rails in space-constrained environments.

FAQ

What is the operating temperature range for the LTC2904ITS8#TRMPBF?

The LTC2904ITS8#TRMPBF is rated for –40°C to +85°C (I-grade), validated across this full industrial temperature range with guaranteed ±1.5% threshold accuracy and 200ms reset timeout performance. This specification is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet, and the "I" suffix in the part number explicitly denotes this extended temperature grade.

Can the LTC2904ITS8#TRMPBF monitor a 5V and a 1.2V supply simultaneously?

Yes, the LTC2904ITS8#TRMPBF can monitor 5V and 1.2V simultaneously. Per Table 1 in the datasheet, setting S1 = V1 and S2 = GND configures V1 = 5V and V2 = 1.2V. The device then applies the selected tolerance (via TOL pin) to both rails independently, asserting RST if either falls below its respective threshold for longer than 200ms.

Does the LTC2904ITS8#TRMPBF require external components for basic operation?

No, the LTC2904ITS8#TRMPBF requires no external resistors or capacitors for core dual-supply monitoring. Thresholds and tolerance are set solely by connecting S1, S2, and TOL to V1, GND, or leaving them open. Only bypass capacitors (0.1μF per V1/V2 pin to GND) are recommended for noise immunity-no timing capacitor is needed since the 200ms delay is internal.

How does the LTC2904ITS8#TRMPBF ensure reliable reset during power-up?

The LTC2904ITS8#TRMPBF ensures reliable power-up reset by using internal VCC auto-select-the higher of V1 or V2 powers the RST/RST drivers. As soon as either input reaches 1V, RST asserts low. Threshold programming completes at ~2.17V on V1, and the 200ms timer starts only after both rails exceed their thresholds-guaranteeing clean release only after full stabilization.

What is the maximum load the RST output of the LTC2904ITS8#TRMPBF can drive?

The RST output of the LTC2904ITS8#TRMPBF can sink up to 2.5mA while maintaining VOL ≤ 0.4V (per Electrical Characteristics table). Its strong internal pull-down supports direct connection to microcontroller reset inputs. For faster rise times or higher VOH, an external pull-up resistor (e.g., 10kΩ) may be added-though this increases total pull-up strength in wired-OR configurations.