Analog Devices Inc. LTC2908CDDB-A1#TRPBF

Overview

LTC2908CDDB-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems requiring accurate, compact, and glitch-immune reset generation. 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 active-low open-drain RST output. It is deployed in network servers and optical networking equipment where reliable power sequencing and brownout detection are critical.

For engineers reviewing the LTC2908CDDB-A1#TRPBF datasheet, LTC2908CDDB-A1#TRPBF pinout, LTC2908CDDB-A1#TRPBF application, or LTC2908CDDB-A1#TRPBF equivalent, this page provides verified technical context, exact pin functions per DDB8 package, confirmed threshold voltages for all six inputs, real-world use scenarios in multivoltage server boards, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The LTC2908CDDB-A1#TRPBF implements six independent high-accuracy comparators referenced to a bandgap, each with built-in first-order low-pass filtering to suppress supply noise transients. Its internal VCC auto-select logic uses the greater of V1 or V2 (up to 6V) as the core supply, enabling operation down to 0.5V on either input while guaranteeing RST logic state integrity.

Reset assertion is synchronized across all six inputs: RST remains low until all monitored voltages exceed their respective thresholds for a continuous 200ms period. The open-drain RST output includes a weak 6μA internal pull-up to VCC and supports wired-OR configuration with other LTC2908 devices for systems requiring >6 supply monitoring points.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), RoHS-compliant, lead-free finish, exposed thermal 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+ and TPS3808G33DBVR, the LTC2908CDDB-A1#TRPBF delivers integrated six-rail monitoring with two adjustable inputs in a single DFN package, eliminating inter-IC timing skew and reducing total solution size by >60% in multivoltage systems - making it the only option that satisfies simultaneous 5V/3.3V/2.5V/1.8V/VADJ1/VADJ2 supervision without external components.

Availability

LTC2908CDDB-A1#TRPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and multivoltage industrial controllers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.

Supply support for LTC2908CDDB-A1#TRPBF 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 digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.

The LTC2908 product line delivers precision multirail power supervision ICs optimized for high-density computing and optical infrastructure, emphasizing ±1.5% threshold accuracy, ultralow-voltage operation, and noise-immune reset generation in minimal footprints.

FAQ

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

The LTC2908CDDB-A1#TRPBF is specified for commercial temperature operation from 0°C to 70°C. This range is confirmed by the "C" grade designation in the part number and aligns with the Absolute Maximum Ratings table showing LTC2908C operation up to 70°C. The device maintains ±1.5% threshold accuracy across this full range, not just at 25°C.

How does the LTC2908CDDB-A1#TRPBF handle power-down sequences when supply voltages collapse asymmetrically?

The LTC2908CDDB-A1#TRPBF asserts RST low immediately upon any input falling below its threshold and guarantees RST remains low as long as V1 and/or V2 ≥ 0.5V - delivering VOL ≤ 0.15V even during deep brownout. This ensures downstream logic receives a clean, unambiguous reset signal throughout asymmetric collapse, preventing metastability in FPGAs or microcontrollers.

Can the LTC2908CDDB-A1#TRPBF monitor a 12V rail, and if so, how is the threshold set?

Yes, the LTC2908CDDB-A1#TRPBF can monitor a 12V rail using either VADJ1 or VADJ2. These inputs feature a 0.5V internal reference; a resistive divider (e.g., 2.15MΩ + 100kΩ) scales 12V to 0.5V at the VADJ pin, yielding a precise 11.25V trip point. Table 1 in the datasheet confirms 2150kΩ/100kΩ as the recommended 1% resistor pair for 12V monitoring.

What is the maximum supply voltage allowed on the V1 and V2 pins of the LTC2908CDDB-A1#TRPBF?

The absolute maximum rating for V1 and V2 is 7V, but the recommended operating voltage is up to 6V per the Absolute Maximum Ratings table. Exceeding 6V risks violating the 0.5V headroom required for internal bandgap reference stability and may degrade threshold accuracy or cause latch-up. For 12V rail monitoring, always use the VADJ inputs with external dividers instead of applying 12V directly to V1 or V2.

Does the LTC2908CDDB-A1#TRPBF require external timing components to achieve its 200ms reset timeout?

No, the LTC2908CDDB-A1#TRPBF integrates the 200ms reset timeout capacitor internally. This eliminates external timing components, improves production consistency, avoids capacitor aging effects, and reduces PCB area. The timeout is factory-trimmed and guaranteed over temperature, with typical values ranging from 160ms to 260ms per the Electrical Characteristics table.