Analog Devices Inc. LTC2908ITS8-C1#TRMPBF

Overview

LTC2908ITS8-C1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply monitor IC designed for multivoltage systems requiring tight threshold accuracy and ultralow-voltage reset assertion. It monitors V1 plus five adjustable inputs (VADJ1–VADJ5) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST operation down to VCC = 0.5V. It is used in optical networking systems and industrial embedded controllers where reliable power sequencing and brownout detection are critical.

For engineers reviewing the LTC2908ITS8-C1#TRMPBF datasheet, LTC2908ITS8-C1#TRMPBF pinout, LTC2908ITS8-C1#TRMPBF application, or LTC2908ITS8-C1#TRMPBF equivalent, this page delivers verified pin functions, confirmed C1 variant input configuration, real-world timing behavior under voltage transients, and validated alternatives for multivoltage monitoring in space-constrained designs.

Technical Context

The LTC2908ITS8-C1#TRMPBF implements six independent comparators referenced to a bandgap-derived 0.5V internal reference, each driving a glitch-immune logic path. Its reset pulse generator enforces a fixed 200ms delay after all inputs exceed thresholds before releasing RST, with no external capacitor required.

V1 serves exclusively as the internal supply (VCC); unlike A1/B1 variants, V2 is not used - all five adjustable inputs (VADJ1–VADJ5) connect to external resistor dividers for custom trip points. The open-drain RST output features a strong pull-down (≤0.15V at 5μA, VCC = 0.5V) and weak internal 6μA pull-up to VCC, enabling wired-OR reset bus configurations.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and TPS3808G33DBVR, the LTC2908ITS8-C1#TRMPBF uniquely integrates six independently adjustable inputs with ±1.5% accuracy and 200ms internal timing in a single TSOT-23 package - delivering system-level supervision with minimal BOM count and zero external timing components.

Availability

LTC2908ITS8-C1#TRMPBF is available at Aetrix Electronics and suitable for optical networking systems, industrial embedded controllers, and multivoltage server backplanes requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.

Supply support for LTC2908ITS8-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2908ITS8-C1#TRMPBF belongs to the LTC® precision power supply supervisor family, engineered for multivoltage systems demanding tight threshold accuracy, ultralow-voltage reset assertion, and minimal board space - especially in optical, telecom, and industrial control applications.

FAQ

What is the exact input configuration supported by LTC2908ITS8-C1#TRMPBF?

The LTC2908ITS8-C1#TRMPBF monitors one primary input (V1) and five adjustable inputs (VADJ1–VADJ5), all referenced to a 0.5V internal comparator threshold. Unlike A1/B1 variants, it has no fixed-voltage inputs (e.g., no dedicated 3.3V or 2.5V pins). Each VADJ pin connects to an external resistor divider to set custom trip points from 0.6V to 12V, as defined in datasheet Table 1. V1 serves solely as the internal VCC source and is not used as a monitored rail in C1 configuration.

Does LTC2908ITS8-C1#TRMPBF require external timing components for its 200ms reset delay?

No, the LTC2908ITS8-C1#TRMPBF implements the 200ms reset timeout entirely internally using a factory-trimmed capacitor. No external resistor or capacitor is required - simplifying layout, reducing BOM count, and eliminating timing tolerance drift due to component aging or temperature variation. This internal timing is guaranteed over the full –40°C to +85°C operating range and requires no user calibration.

What is the minimum V1 voltage required for LTC2908ITS8-C1#TRMPBF to assert a valid RST low signal?

The LTC2908ITS8-C1#TRMPBF guarantees correct RST logic state (low) as long as V1 ≥ 0.5V. At V1 = 0.5V and IRST = 5μA, the output voltage is specified ≤0.15V - ensuring a solid logic-low level even during deep brownout. This ultralow-voltage capability distinguishes it from most supervisors that fail below 1.0V, making LTC2908ITS8-C1#TRMPBF suitable for systems requiring fail-safe reset hold during extreme supply collapse.

Can multiple LTC2908ITS8-C1#TRMPBF devices share a common RST line?

Yes, the RST pin is an active-low open-drain output with a weak internal 6μA pull-up to VCC. Multiple LTC2908ITS8-C1#TRMPBF units can be wired-OR on a single reset bus - if any device asserts RST low, the entire bus is pulled low. External pull-up resistors may be added for faster rise time or higher VOH, but are not required for basic functionality. This enables hierarchical or distributed power monitoring in large systems.

How does the LTC2908ITS8-C1#TRMPBF prevent false resets caused by supply noise?

The LTC2908ITS8-C1#TRMPBF employs dual noise immunity mechanisms: (1) first-order lowpass filtering at each comparator output to reject short transients, and (2) a 200ms reset timeout that ignores supply disturbances faster than ~5Hz. These features eliminate spurious resets without adding hysteresis - preserving the ±1.5% threshold accuracy critical for tight system voltage margin design. Bypass capacitors on V1 (≥0.1μF) are still recommended to stabilize the internal VCC rail.