Analog Devices Inc. LTC2908CDDB-B1#TRPBF

Overview

LTC2908CDDB-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems requiring tight threshold accuracy and glitch immunity. It monitors 3.3V, 2.5V, 1.8V, 1.5V, 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 wireless base stations and optical networking systems where reliable power sequencing and brownout detection are critical.

For engineers reviewing the LTC2908CDDB-B1#TRPBF datasheet, LTC2908CDDB-B1#TRPBF pinout, LTC2908CDDB-B1#TRPBF application, or LTC2908CDDB-B1#TRPBF equivalent, key selection criteria include its guaranteed 0.5V minimum VCC operation, ultralow-voltage RST pull-down capability, six independent comparator inputs with internal glitch filtering, and compatibility with 3mm × 2mm DFN-8 packaging for space-constrained PCB layouts.

Technical Context

The LTC2908CDDB-B1#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 reset pulse generator enforces a fixed 200ms delay after all monitored voltages exceed their thresholds before releasing RST.

VCC is auto-selected as the greater of V1 or V2, enabling self-powering from monitored rails; the RST output uses a strong NMOS pull-down (guaranteed <0.15V at 5μA with VCC ≥ 0.5V) and a weak 6μA internal pull-up to VCC, supporting wired-OR configurations without external components.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), 0.75mm height, 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 TPS3808G33DBVR and MAX6816EUT+T, the LTC2908CDDB-B1#TRPBF provides full six-input coverage with two programmable thresholds and guaranteed 0.5V VCC operation - making it uniquely suited for complex multivoltage systems requiring both precision and architectural flexibility.

Availability

LTC2908CDDB-B1#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure, optical networking, and high-reliability computing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2908CDDB-B1#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.

The LTC2908 product line was developed by Linear Technology to deliver precision, low-power, multirail supply monitoring in minimal footprint - specifically targeting telecom, networking, and computing systems demanding robust power integrity.

FAQ

What is the operating temperature range for the LTC2908CDDB-B1#TRPBF?

The LTC2908CDDB-B1#TRPBF is rated for commercial temperature operation from 0°C to 70°C. This grade is validated per the manufacturer's specifications for the "C" temperature suffix and is suitable for indoor, controlled-environment applications such as desktop computers and enterprise networking equipment where ambient thermal stress is moderate.

How does the LTC2908CDDB-B1#TRPBF select its internal supply voltage (VCC)?

The LTC2908CDDB-B1#TRPBF automatically selects VCC as the greater of the V1 or V2 input voltages. When V1 ≥ V2, V1 powers the internal circuitry; when V2 > V1, V2 becomes VCC. This dual-supply auto-selection eliminates the need for an external bias rail and ensures continuous operation even if one monitored rail fails, as long as the other remains ≥0.5V.

Can the LTC2908CDDB-B1#TRPBF monitor voltages below 1.5V?

Yes - the LTC2908CDDB-B1#TRPBF can monitor sub-1.5V rails using its VADJ1 and VADJ2 inputs, each referenced to an internal 0.5V threshold. By connecting a resistor divider from the target rail to ground, users can configure precise trip points down to ~0.5V (e.g., 0.9V, 0.75V, or 0.6V), enabling supervision of modern low-voltage cores and I/O domains.

What is the maximum number of LTC2908CDDB-B1#TRPBF devices that can be wired-OR on a single RST line?

There is no fixed limit on the number of LTC2908CDDB-B1#TRPBF devices that can share a wired-OR RST bus, provided the total capacitive load remains within rise-time constraints and the external pull-up resistor value is adjusted accordingly. Each device contributes only a 6μA internal pull-up, so adding units increases rise time linearly - design verification with actual layout parasitics is recommended.

Does the LTC2908CDDB-B1#TRPBF require external timing components for its 200ms reset delay?

No - the LTC2908CDDB-B1#TRPBF integrates the 200ms reset timeout capacitor internally. This eliminates the need for external timing components, reduces BOM count, improves reliability, and ensures consistent delay behavior across temperature and process variations without user calibration or component selection.