Analog Devices Inc. LTC2908CTS8-C1#TRMPBF

Overview

LTC2908CTS8-C1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems requiring tight threshold accuracy and ultralow-voltage reset assertion. It monitors V1 and five adjustable inputs (VADJ1–VADJ5) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST pull-down operation down to VCC = 0.5V. It is used in desktop computers and optical networking systems where reliable power sequencing and brownout detection are critical.

For engineers reviewing the LTC2908CTS8-C1#TRMPBF datasheet, LTC2908CTS8-C1#TRMPBF pinout, LTC2908CTS8-C1#TRMPBF application, or LTC2908CTS8-C1#TRMPBF equivalent, key selection considerations include its C1 variant's fixed 2.5V nominal reference input (V1), five 0.5V-adjustable thresholds, TSOT-23-8 package, open-drain RST output with 200ms delay, and guaranteed operation at VCC ≥ 0.5V.

Technical Context

The LTC2908CTS8-C1#TRMPBF implements six independent comparators referenced to a bandgap-derived 0.5V internal reference, with V1 serving as both monitored input and internal supply (VCC). All five VADJ inputs share identical 0.492V–0.508V threshold range (±1.5%), enabling precise monitoring of diverse rail voltages via external resistor dividers.

Its reset logic asserts active-low RST when any input falls below its threshold and holds low for 200ms after all inputs return above threshold. Glitch immunity is achieved through integrated comparator filtering and the 200ms timeout, eliminating need for external timing capacitors or hysteresis networks.

Key Specifications

Pinout & Package

Package: 8-lead plastic TSOT-23 (3mm × 1.75mm, 1mm height), RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369ETA+T and TPS3808G33DBVR, the LTC2908CTS8-C1#TRMPBF uniquely delivers five independently adjustable thresholds with ±1.5% accuracy in an 8-pin TSOT-23, enabling full-system supervision without accuracy trade-offs or additional components.

Availability

LTC2908CTS8-C1#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and optical networking systems requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade performance.

Supply support for LTC2908CTS8-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 acquired Linear Technology in 2017 and maintains its high-performance analog product lines, including precision supervisors, with global manufacturing and quality certification (ISO 9001, IATF 16949).

The LTC2908 series was designed specifically for multivoltage digital systems needing compact, accurate, and robust power-on reset and brownout detection-targeting servers, telecom infrastructure, and high-reliability computing platforms.

FAQ

What is the function of V1 in the LTC2908CTS8-C1#TRMPBF?

V1 serves a dual role in the LTC2908CTS8-C1#TRMPBF: it is both the primary monitored input (configured for 2.5V nominal) and the internal supply voltage (VCC) for the IC. As long as V1 ≥ 0.5V, the RST output remains valid. This eliminates the need for a separate bias rail and simplifies power architecture in space-constrained designs.

How does the LTC2908CTS8-C1#TRMPBF achieve ±1.5% threshold accuracy across temperature?

The LTC2908CTS8-C1#TRMPBF achieves ±1.5% threshold accuracy using a trimmed bandgap reference and matched comparator input stages. Its VADJ1–VADJ5 inputs are referenced to a stable 0.5V internal node, and the entire threshold specification-including V1's 2.5V monitor-is guaranteed over 0°C to 70°C per the datasheet's "l" notation, verified by production test across temperature.

Can the LTC2908CTS8-C1#TRMPBF monitor fewer than six supplies?

Yes-the LTC2908CTS8-C1#TRMPBF can monitor fewer than six supplies. Unused VADJ inputs (VADJ1–VADJ5) should be tied to the nearest higher available supply voltage (e.g., VADJ2–VADJ5 tied to V1 = 2.5V) to prevent floating nodes. The device requires only V1 and at least one VADJ input to operate meaningfully.

What is the maximum load capacitance supported by the RST output of the LTC2908CTS8-C1#TRMPBF?

The RST output of the LTC2908CTS8-C1#TRMPBF supports up to 100pF of total load capacitance while maintaining specified rise/fall times. With typical 40Ω pull-down resistance and 150pF load, fall time is ~13ns; for heavier loads, an external pull-up resistor may be added to improve rise time without affecting functionality.

Does the LTC2908CTS8-C1#TRMPBF require external timing components?

No-the LTC2908CTS8-C1#TRMPBF requires no external timing components. Its 200ms reset timeout is generated by an internal capacitor and timer circuit, eliminating the need for external RC networks. This reduces BOM count, PCB area, and potential drift-related inaccuracies in production systems.