Analog Devices Inc. LTC2908ITS8-A1#TRMPBF

Overview

LTC2908ITS8-A1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply monitor IC designed for multivoltage systems requiring tight threshold accuracy and ultralow-voltage reset operation. It monitors 5V, 3.3V, 2.5V, 1.8V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST assertion down to VCC = 0.5V. It is used in network servers and optical networking systems for reliable power-on reset and brownout detection.

For engineers reviewing the LTC2908ITS8-A1#TRMPBF datasheet, LTC2908ITS8-A1#TRMPBF pinout, LTC2908ITS8-A1#TRMPBF application, or LTC2908ITS8-A1#TRMPBF equivalent, key selection criteria include its fixed 5V/3.3V/2.5V/1.8V thresholds, dual adjustable inputs, TSOT-23-8 package, –40°C to 85°C industrial temperature grade, and open-drain RST output with guaranteed low-state operation at 0.5V supply.

Technical Context

The LTC2908ITS8-A1#TRMPBF implements six independent voltage comparators referenced to a bandgap, each with built-in glitch immunity via first-order lowpass filtering on comparator outputs. Its internal reset pulse generator enforces a 200ms delay after all inputs exceed thresholds before releasing RST.

VCC is auto-selected as the greater of V1 or V2 (up to 6V), powering internal circuitry including the 6μA weak pull-up on RST. The device guarantees correct RST logic state (low when any input is out-of-tolerance) as long as V1 and/or V2 ≥ 0.5V, enabling robust operation during deep brownout conditions.

Key Specifications

Pinout & Package

Package: 8-lead plastic TSOT-23 (thin small-outline transistor), 2.9mm × 1.6mm × 1.0mm profile, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supply monitor applications.

Compared with MAX6326US33D3+T and TPS3808G33DBVR, the LTC2908ITS8-A1#TRMPBF delivers integrated six-rail monitoring with fixed and adjustable thresholds in one TSOT-23-8 package, eliminating multiple discrete supervisors and reducing total solution size by >70% in multivoltage systems.

Availability

LTC2908ITS8-A1#TRMPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and wireless base stations requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LTC2908ITS8-A1#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 high-performance analog IC portfolio, including precision power management and supervision products.

The LTC2908 series belongs to Linear's precision voltage supervisor product line, engineered for systems demanding accurate, glitch-immune reset generation across multiple supply rails in space- and power-constrained environments.

FAQ

What is the operating temperature range for the LTC2908ITS8-A1#TRMPBF?

The LTC2908ITS8-A1#TRMPBF is rated for –40°C to +85°C, qualifying it for industrial-grade applications including base station equipment and network infrastructure. This range is confirmed by the "I" grade suffix in the part number and matches the LTC2908I specification in the official datasheet. The device maintains ±1.5% threshold accuracy across this full range, ensuring consistent reset behavior under thermal stress.

How does the LTC2908ITS8-A1#TRMPBF handle power-up sequencing?

During power-up, the LTC2908ITS8-A1#TRMPBF asserts RST low as soon as V1 or V2 reaches 0.5V. RST remains low until all six monitored voltages (5V, 3.3V, 2.5V, 1.8V, VADJ1, VADJ2) exceed their respective thresholds and stay valid for 200ms. This ensures microprocessors and FPGAs receive a clean, debounced reset signal only after all supplies are stable.

Can the LTC2908ITS8-A1#TRMPBF monitor voltages other than 5V, 3.3V, 2.5V, and 1.8V?

Yes - the LTC2908ITS8-A1#TRMPBF includes two adjustable inputs (VADJ1 and VADJ2) referenced to an internal 0.5V comparator threshold. By connecting each to a resistive divider from a target rail (e.g., 1.5V, 1.2V, 0.85V), users can precisely set trip points. The datasheet provides standard 1% resistor values for common voltages, enabling accurate monitoring beyond the four fixed rails.

What is the maximum input voltage allowed on V1 and V2 pins of the LTC2908ITS8-A1#TRMPBF?

The absolute maximum rating for V1 and V2 is 7V, but the recommended operating voltage is up to 6V per the datasheet's Absolute Maximum Ratings table. Exceeding 6V risks damage or parametric shift. Both pins serve as potential VCC sources, and the greater voltage automatically powers internal circuitry - making them critical for proper reset generation and RST output integrity.

Does the LTC2908ITS8-A1#TRMPBF require external timing components?

No - the LTC2908ITS8-A1#TRMPBF integrates a 200ms reset timeout capacitor internally, eliminating the need for external RC networks. This simplifies layout, improves reliability, and ensures consistent timing across temperature and process variations. The internal timer starts only after all six inputs exceed their thresholds and holds RST low for the full duration before releasing it.