Analog Devices Inc. LTC2935CTS8-1#TRMPBF

Overview

LTC2935CTS8-1#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with open-drain reset and power-fail outputs, eight pin-selectable reset thresholds (e.g., 3.30V, 3.15V, 3.00V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current. It serves as a system initialization and early-warning monitor in battery-powered portable equipment.

For engineers reviewing the LTC2935CTS8-1#TRMPBF datasheet, LTC2935CTS8-1#TRMPBF pinout, LTC2935CTS8-1#TRMPBF application, or LTC2935CTS8-1#TRMPBF equivalent, key selection criteria include its TSOT-23-8 package, –40°C to 85°C operating range, 200ms reset timeout, manual reset input (MR), and precise hysteresis (5%) on RST release.

Technical Context

The LTC2935CTS8-1#TRMPBF integrates two independent comparators: one for reset generation (RST) with 5% hysteresis and a second for early power-fail warning (PFO) at a fixed offset above the selected reset threshold (150mV for -1/-2 variants). Its internal precision attenuators eliminate external resistor networks for threshold setting.

It uses binary-encoded S2/S1/S0 inputs to select among eight discrete falling-reset thresholds (3.30V to 2.25V for LTC2935-1), each paired with a corresponding PFO threshold. The device operates across VCC = 1V to 5.5V and features guaranteed glitch immunity and undervoltage detection within 1ms.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (ThinSOT™), 2.9mm × 1.6mm × 0.8mm profile, lead-free, RoHS-compliant. Exposed pad not present in TSOT-23 variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with LTC2935ITS8-1#TRMPBF, the LTC2935CTS8-1#TRMPBF offers lower cost and sufficient performance for indoor commercial use, while LTC2934CTS8#TRMPBF trades pin-select simplicity for analog adjustability-neither is pin-compatible with the other, but all share identical footprint and basic interface behavior.

Availability

LTC2935CTS8-1#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered security alarms, and point-of-sale handheld terminals requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2935CTS8-1#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.

The LTC2935 belongs to Linear's ultralow-power supervisor family, designed specifically for energy-constrained battery-operated systems requiring deterministic reset and early power-fail signaling without external passive components.

FAQ

What is the operating temperature range of the LTC2935CTS8-1#TRMPBF?

The LTC2935CTS8-1#TRMPBF is specified for 0°C to 70°C ambient operation. This commercial-grade rating matches its "C" suffix designation and is validated across all electrical parameters in the datasheet. For extended temperature applications, the LTC2935ITS8-1#TRMPBF (–40°C to 85°C) is the direct functional counterpart with identical pinout and specifications except temperature range.

How does the power-fail output (PFO) behave relative to the reset output (RST) in the LTC2935CTS8-1#TRMPBF?

In the LTC2935CTS8-1#TRMPBF, the PFO output asserts low when VCC falls below a threshold that is fixed at 150mV above the selected reset threshold (e.g., 3.30V reset → 3.45V PFO). PFO releases when VCC rises above that PFO threshold plus 2.5% hysteresis, while RST releases only after VCC exceeds its own threshold plus 5% hysteresis and a 200ms timer expires. This staged response enables controlled shutdown sequencing.

Can the LTC2935CTS8-1#TRMPBF be used with a supply voltage below 1.6V?

Yes - the LTC2935CTS8-1#TRMPBF operates down to 1V VCC, and its lowest selectable reset threshold is 2.25V (S2=S1=S0=High). However, the device remains functional and draws only 500nA even when VCC is as low as 1V, allowing it to monitor deeply discharged batteries or low-voltage rails where other supervisors fail to operate or draw excessive current.

What is the purpose of the S2, S1, and S0 pins on the LTC2935CTS8-1#TRMPBF?

The S2, S1, and S0 pins on the LTC2935CTS8-1#TRMPBF are binary-encoded inputs that configure one of eight discrete reset thresholds (3.30V to 2.25V) and their corresponding PFO thresholds. Each pin is tied to either GND or VCC - no external logic drivers are needed. Their state directly selects the internal attenuator ratio, eliminating external resistor networks and calibration effort.

Does the LTC2935CTS8-1#TRMPBF require external pull-up resistors on RST and PFO?

Yes - because the LTC2935CTS8-1#TRMPBF uses open-drain outputs (denoted by "-1" suffix), external pull-up resistors are mandatory for RST and PFO to achieve valid high-level logic states. Recommended values range from 10kΩ to 470kΩ, with 100kΩ being typical. These resistors may be pulled up to any voltage ≤5.5V, including voltages higher than VCC, enabling level-shifting flexibility not possible with active-pull-up variants.