Analog Devices Inc. LTC2908CDDB-A1#TRMPBF

Overview

LTC2908CDDB-A1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage system power sequencing and fault detection. It monitors 5V, 3.3V, 2.5V, 1.8V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over temperature, features a 200ms reset timeout, and delivers guaranteed RST assertion down to 0.5V VCC - enabling reliable reset during brownout in network servers and optical networking systems.

For engineers reviewing the LTC2908CDDB-A1#TRMPBF datasheet, LTC2908CDDB-A1#TRMPBF pinout, LTC2908CDDB-A1#TRMPBF application, or LTC2908CDDB-A1#TRMPBF equivalent, key selection criteria include its DFN-8 (3mm × 2mm) package, A1 variant input configuration (5V/3.3V/2.5V/1.8V/ADJ1/ADJ2), open-drain RST output with ultralow-voltage pull-down capability, and guaranteed ±1.5% threshold tolerance across 0°C to 70°C operation.

Technical Context

The LTC2908CDDB-A1#TRMPBF implements six independent high-accuracy comparators with internal bandgap reference and glitch-immune timing logic. Its reset pulse generator enforces a fixed 200ms delay after all inputs exceed thresholds before releasing RST, and it uses internal auto-select of VCC from the greater of V1 or V2 to power internal circuitry.

Input architecture supports both fixed-threshold monitoring (VRT50, VRT33, VRT25, VRT18) and two 0.5V-referenced adjustable inputs (VRTADJ), with each comparator incorporating first-order low-pass filtering to suppress transients. The RST output combines a strong NMOS pull-down (typ. 40Ω on-resistance) and weak 6μA internal pull-up to VCC, enabling wired-OR configurations without external components.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), 1mm profile, 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 MAX6326UT46D3+T and TPS3808G33DBVR, the LTC2908CDDB-A1#TRMPBF provides integrated six-rail monitoring with adjustable thresholds and superior ±1.5% accuracy - reducing component count, PCB area, and system-level timing uncertainty in complex multivoltage designs.

Availability

LTC2908CDDB-A1#TRMPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and desktop computers requiring stable component supply, long-term lifecycle support, and guaranteed 0°C to 70°C industrial-grade operation.

Supply support for LTC2908CDDB-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets.

The LTC2908 product line delivers precision multivoltage supervision for systems demanding high threshold accuracy, ultralow-voltage operation, and compact packaging - targeting infrastructure equipment where reliability and power sequencing integrity are critical.

FAQ

What is the operating temperature range for the LTC2908CDDB-A1#TRMPBF?

The LTC2908CDDB-A1#TRMPBF is specified for operation from 0°C to 70°C. This commercial-grade temperature range is validated per the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, with all key parameters - including ±1.5% threshold accuracy and 200ms reset timeout - guaranteed across this full interval.

How does the LTC2908CDDB-A1#TRMPBF handle power-up sequencing?

During power-up, the LTC2908CDDB-A1#TRMPBF asserts RST low as soon as V1 or V2 reaches 200mV. Once all six inputs exceed their respective thresholds, an internal 200ms timer starts; RST releases only after this delay completes. This ensures all rails are stable before releasing processor reset, preventing premature boot attempts.

Can the LTC2908CDDB-A1#TRMPBF monitor non-standard supply voltages?

Yes - the LTC2908CDDB-A1#TRMPBF includes two adjustable inputs (VADJ1 and VADJ2) referenced to an internal 0.5V bandgap. By connecting each to a resistor divider between the target supply and ground, users can configure precise trip points for voltages such as 12V, 8V, or 1.2V, as detailed in Table 1 of the datasheet.

What is the maximum input voltage rating for the LTC2908CDDB-A1#TRMPBF pins?

The absolute maximum voltage rating for V1, V2, V3, and V4 is –0.3V to 7V. For VADJ1–VADJ2, the limit is –0.3V to (VCC + 0.6V). These ratings are defined in the Absolute Maximum Ratings table and allow direct connection to common system rails including 5V, 3.3V, 2.5V, and 1.8V without external attenuation.

Does the LTC2908CDDB-A1#TRMPBF require external timing components?

No - the LTC2908CDDB-A1#TRMPBF integrates an internal 200ms reset timeout capacitor, eliminating the need for external RC networks. This simplifies layout, improves timing accuracy across temperature, and reduces BOM count compared to supervisors requiring discrete timing components.