Analog Devices Inc. LTC2908ITS8-B1#TRPBF

Overview

LTC2908ITS8-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage system power sequencing and brownout detection. 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 guaranteed RST low-state operation down to 0.5V VCC - enabling reliable reset assertion during deep undervoltage conditions in network servers and optical networking systems.

For engineers reviewing the LTC2908ITS8-B1#TRPBF datasheet, LTC2908ITS8-B1#TRPBF pinout, LTC2908ITS8-B1#TRPBF application, or LTC2908ITS8-B1#TRPBF equivalent, this page provides verified functional specifications, validated TSOT-23 pin mapping, confirmed B1 variant input configuration (3.3V/2.5V/1.8V/1.5V/ADJ1/ADJ2), real-world timing behavior under glitch immunity, and direct alternative part comparisons for multivoltage monitoring designs.

Technical Context

The LTC2908ITS8-B1#TRPBF implements six independent high-accuracy comparators referenced to a bandgap, each with built-in first-order low-pass filtering to suppress transient-induced false resets. Its internal VCC auto-select logic uses the greater of V1 or V2 as the supply rail, enabling operation without external biasing.

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 internal 6μA pull-up to VCC and a strong low-voltage pull-down capable of sinking >2.5mA at VCC = 3.0V while maintaining VOL ≤ 0.15V at VCC = 0.5V.

Key Specifications

Pinout & Package

Package: 8-lead plastic TSOT-23 (ThinSOT™), 3mm × 1.75mm body, 1mm maximum height, exposed pad optional (not electrically connected in TS8).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar six-input voltage monitoring applications.

Compared with MAX6816EUT+T and TPS3808G33DBVR, the LTC2908ITS8-B1#TRPBF uniquely integrates six precisely matched comparators with adjustable thresholds and guaranteed sub-0.5V reset operation - delivering higher integration density, tighter accuracy, and true multirail coordination in a single TSOT-23 package.

Availability

LTC2908ITS8-B1#TRPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and wireless base stations requiring stable component supply with industrial temperature grade (–40°C to +85°C) and tape-and-reel packaging.

Supply support for LTC2908ITS8-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 for precision instrumentation, communications, and power management.

The LTC2908ITS8-B1#TRPBF belongs to Linear's precision power supervision product line, engineered specifically for multivoltage system reliability in telecom infrastructure, enterprise computing, and industrial control applications demanding ±1.5% threshold accuracy and ultralow-voltage reset capability.

FAQ

What is the exact input voltage configuration supported by the LTC2908ITS8-B1#TRPBF?

The LTC2908ITS8-B1#TRPBF is factory-configured for six specific inputs: V1 monitors 3.3V, V2 monitors 2.5V, V3 monitors 1.8V, V4 monitors 1.5V, and VADJ1/VADJ2 monitor user-adjustable voltages via external resistor dividers referenced to 0.5V. This B1 variant differs from A1 (5V/3.3V/2.5V/1.8V/ADJ1/ADJ2) and C1 (2.5V/ADJ1–ADJ5) configurations - confirmed in the Electrical Characteristics table for LTC2908-B1.

Does the LTC2908ITS8-B1#TRPBF require external timing components?

No, the LTC2908ITS8-B1#TRPBF does not require external timing components. Its 200ms reset timeout is generated by an internal capacitor-based timer, eliminating the need for external RC networks. This is explicitly stated in the Applications Information section: "The reset delay is set to a nominal of 200ms with an internal capacitor, eliminating the need for an external timing capacitor."

Can the LTC2908ITS8-B1#TRPBF operate with only three supply rails?

Yes, the LTC2908ITS8-B1#TRPBF can monitor fewer than six rails. Unused inputs (e.g., VADJ1/VADJ2 when only four fixed rails are present) must be tied to the closest higher available supply voltage - as specified in the Applications Information section: "In an application with less than six supply voltages, the unused supervisor inputs should be tied to the closest higher supply voltage available."

What is the minimum VCC voltage that guarantees correct RST logic state for the LTC2908ITS8-B1#TRPBF?

The LTC2908ITS8-B1#TRPBF guarantees correct RST logic state (low when asserted, high-impedance otherwise) as long as V1 and/or V2 ≥ 0.5V. This is documented in the Features list ("Ultralow Voltage Reset: VCC = 0.5V Guaranteed") and Absolute Maximum Ratings table, enabling robust reset signaling even during deep brownout conditions where VCC drops below 1V.

How does the LTC2908ITS8-B1#TRPBF prevent false resets caused by supply noise?

The LTC2908ITS8-B1#TRPBF employs dual-stage noise immunity: (1) first-order low-pass filtering at each comparator output to integrate transients before logic evaluation, and (2) a 200ms digital timer that requires all inputs to remain above threshold continuously for that duration before releasing RST. This architecture rejects noise with frequency content above 5Hz - detailed in the Applications Information section on "Glitch Immunity."