Analog Devices Inc. LTC2908CDDB-C1#TRMPBF

Overview

LTC2908CDDB-C1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems requiring accurate, low-power, and compact power monitoring. It monitors one fixed 2.5V rail and five adjustable inputs (VADJ1–VADJ5) with ±1.5% threshold accuracy over temperature, features a 200ms reset timeout, active-low open-drain RST output, and operates down to 0.5V VCC. It is used in optical networking systems and multivoltage server power rails.

For engineers reviewing the LTC2908CDDB-C1#TRMPBF datasheet, LTC2908CDDB-C1#TRMPBF pinout, LTC2908CDDB-C1#TRMPBF application, or LTC2908CDDB-C1#TRMPBF equivalent, this page delivers verified circuit role, package mapping, threshold specifications per input, reset timing behavior, and validated alternative options - all confirmed for the C1 variant in DFN-8 (3mm × 2mm) packaging.

Technical Context

The LTC2908CDDB-C1#TRMPBF implements six independent comparators referenced to a bandgap-derived 0.5V internal reference, each comparing an input voltage against a precise threshold. Its architecture uses internal auto-select of V1 as VCC (no V2 dependency), eliminating external supply requirements and enabling operation during brownout.

All six inputs are dedicated to adjustable thresholds (VADJ1–VADJ5 plus V1 at 2.5V nominal), with no fixed-voltage inputs beyond V1. Glitch immunity is achieved via comparator-level low-pass filtering and a 200ms digital reset timer that resets on any threshold violation during the delay window.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), exposed pad (pin 9, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2908CDDB-C1#TRMPBF provides six independently configurable inputs with ±1.5% accuracy and integrated 200ms timing - delivering superior flexibility for multirail systems without external components or accuracy trade-offs.

Availability

LTC2908CDDB-C1#TRMPBF is available at Aetrix Electronics and suitable for optical networking systems, multivoltage server power rails, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC2908CDDB-C1#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-precision analog and power management product lines with rigorous automotive and industrial qualification.

The LTC2908 series belongs to Linear's precision power supervision family, engineered specifically for high-reliability multivoltage systems where accuracy, ultralow-voltage operation, and space-constrained layouts are critical design constraints.

FAQ

What is the exact input configuration supported by the LTC2908CDDB-C1#TRMPBF?

The LTC2908CDDB-C1#TRMPBF monitors six inputs: V1 (fixed 2.5V threshold) and VADJ1 through VADJ5 (all adjustable to 0.492–0.508V). Unlike A1/B1 variants, it does not support fixed 3.3V, 1.8V, or 1.5V inputs - all five adjustable pins require external resistor dividers to set trip points. This configuration is explicitly defined in the "LTC2908-C1" section of the datasheet.

Does the LTC2908CDDB-C1#TRMPBF require an external timing capacitor?

No, the LTC2908CDDB-C1#TRMPBF integrates the 200ms reset timeout capacitor internally. No external timing components are needed - the delay is factory-trimmed and guaranteed between 160ms and 260ms over temperature. This eliminates layout complexity and component variation affecting reset timing.

What is the minimum V1 voltage required to guarantee correct RST logic state in the LTC2908CDDB-C1#TRMPBF?

The LTC2908CDDB-C1#TRMPBF guarantees correct RST logic state (low when tripped, high when released) as long as V1 ≥ 0.5V. Below 0.5V, RST behavior is unspecified. This ultralow-voltage capability is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section under "VCC Internal Supply Voltage".

Can multiple LTC2908CDDB-C1#TRMPBF devices be wired-OR connected on the same RST line?

Yes - the LTC2908CDDB-C1#TRMPBF features an open-drain RST output, allowing multiple units to share a common reset bus via wired-OR connection. When any device asserts low, the net RST line goes low; all must release for the line to rise. This is explicitly supported and documented in the "Typical Application" and "Pin Functions" sections.

What is the input leakage current specification for VADJ pins on the LTC2908CDDB-C1#TRMPBF?

The VADJ1–VADJ5 pins on the LTC2908CDDB-C1#TRMPBF exhibit ±15nA maximum input current at 0.55V, as specified in the Electrical Characteristics table under "IVADJ". This ultra-low leakage ensures minimal error in resistor-divider-based trip point setting and supports high-value divider networks without significant loading effects.