Analog Devices Inc. LTC2911CTS8-2

Overview

LTC2911CTS8-2 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator, designed for reliable system reset and early warning in multi-rail power systems. It monitors 3.3V (V1), 2.5V (V2), and an adjustable threshold (ADJ) with ±1.5% accuracy over temperature, features 200ms internal reset timeout, 30µA typical quiescent current, and operates down to 0.5V VCC - enabling robust power sequencing in desktop computers and industrial controllers.

For engineers reviewing the LTC2911CTS8-2 datasheet, LTC2911CTS8-2 pinout, LTC2911CTS8-2 application, or LTC2911CTS8-2 equivalent, this page delivers verified specifications, TSOT-23-8 package details, functional pin roles, real-world use cases, and two validated alternative parts - all grounded in the official LTC2911-2 datasheet and Linear/Analog Devices product documentation.

Technical Context

The LTC2911CTS8-2 implements three independent voltage comparators: one fixed 3.086V threshold on V1 (3.3V –6.5%), one fixed 2.338V threshold on V2 (2.5V –6.5%), and one 500mV nominal threshold on ADJ for configurable monitoring via resistive divider. All comparators feature 1.5% total threshold accuracy across –40°C to 85°C and built-in glitch filtering for noise immunity.

Its dual-output architecture includes an open-drain RST output asserted low when any monitored supply falls below its threshold, and an open-drain PFO output triggered by the PFI input crossing 500mV (falling) / 515mV (rising) - enabling programmable power-fail warning. The TMR pin supports internal 200ms timeout, external capacitor timing, or latch mode for margin testing.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-supply monitoring applications.

Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911CTS8-2 uniquely integrates triple-rail monitoring, programmable PFI-based power-fail warning, and adjustable threshold capability in a single TSOT-23-8 package - delivering net BOM reduction, smaller footprint, and enhanced system-level fault response without compromising accuracy or temperature stability.

Availability

LTC2911CTS8-2 is available at Aetrix Electronics and suitable for desktop computer power sequencing, industrial PLC I/O module monitoring, and automotive infotainment head unit designs requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 85°C.

Supply support for LTC2911CTS8-2 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, industrial automation, and communications markets.

The LTC2911 family was designed specifically for high-accuracy, low-power multi-rail system supervision in space-constrained computing and industrial platforms - emphasizing ±1.5% threshold stability, ultralow-VCC operation, and integrated power-fail warning.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911CTS8-2?

The LTC2911CTS8-2 has a guaranteed V1 reset threshold of 3.086V (3.3V –6.5%) with ±1.5% accuracy over temperature, and a V2 threshold of 2.338V (2.5V –6.5%) with identical ±1.5% tolerance. These values are specified in the Electrical Characteristics table of the official datasheet and apply across the full –40°C to 85°C operating range.

Does the LTC2911CTS8-2 support external reset timeout configuration, or is it fixed at 200ms?

The LTC2911CTS8-2 supports both modes: tying the TMR pin to V1 enables the internal 200ms timeout, while connecting an external capacitor (CTMR) from TMR to GND configures adjustable timeout - e.g., 2.2nF yields ~20ms. Leaving TMR open gives ~400µs minimum. All options are fully supported per the datasheet's Timing Diagrams and Applications Information sections.

Can the LTC2911CTS8-2 monitor a 5V supply on the V2 pin?

No - the LTC2911CTS8-2 is the -2 variant, which is factory-configured for 2.5V monitoring on V2. To monitor 5V, the LTC2911CTS8-1 variant must be used. The part number suffix (-1 through -5) directly encodes the V2 threshold: -1 = 5V, -2 = 2.5V, -3 = 1.8V, etc. This is explicitly defined in the Product Selection Guide section of the datasheet.

How does the PFI/PFO function work in the LTC2911CTS8-2, and what is its hysteresis?

The PFI input on the LTC2911CTS8-2 compares against a 500mV falling-edge threshold and 515mV rising-edge threshold, yielding 15mV (3%) hysteresis for noise rejection. When PFI drops below 500mV, PFO pulls low to signal imminent power failure; it releases high only after PFI rises above 515mV. This enables reliable early-warning signaling without chatter during marginal supply conditions.

Is the LTC2911CTS8-2 pin-compatible with other variants like LTC2911CTS8-3 or LTC2911CTS8-5?

Yes - all LTC2911 variants in the TSOT-23-8 (TS8) package share identical pinout and footprint. The -2, -3, -4, and -5 versions differ only in factory-set V2 thresholds and internal reference configurations; electrical pin functions (V1, V2, ADJ, PFI, TMR, RST, PFO, GND) remain unchanged across the family, enabling direct PCB reuse when changing monitoring requirements.