Analog Devices Inc. LTC2935ITS8-2#TRPBF

Overview

LTC2935ITS8-2#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up reset and power-fail outputs, eight pin-selectable reset thresholds (e.g., 3.00V ±1.5%), 500nA typical quiescent current, and –40°C to +85°C industrial temperature range - used for battery-powered system initialization and controlled shutdown in portable electronics.

For engineers reviewing the LTC2935ITS8-2#TRPBF datasheet, LTC2935ITS8-2#TRPBF pinout, LTC2935ITS8-2#TRPBF application, or LTC2935ITS8-2#TRPBF equivalent, key selection criteria include its active-pull-up RST/PFO outputs, 200ms reset timeout, ±1.5% threshold accuracy over temperature, and TSOT-23-8 package compatibility with space-constrained designs.

Technical Context

The LTC2935ITS8-2#TRPBF integrates dual comparators with precision internal attenuators to monitor VCC against independently configured reset and power-fail thresholds. Its active-pull-up output stage eliminates external pull-up resistors and ensures valid logic levels even when VCC drops near ground.

Threshold selection uses three binary inputs (S2/S1/S0) to configure one of eight fixed falling-reset thresholds (e.g., 3.00V, 2.85V, 2.70V); the corresponding power-fail threshold is fixed at +150mV above each selected reset threshold. Hysteresis is 5% on RST and 2.5% on PFO for noise immunity.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (ThinSOT™), 2.9mm × 1.6mm footprint, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935CTS8-2#TRPBF, the LTC2935ITS8-2#TRPBF guarantees operation down to –40°C, making it suitable for cold-climate deployments; versus LTC2934ITS8#TRPBF, it eliminates resistor tolerance errors and saves PCB space by embedding threshold selection in silicon.

Availability

LTC2935ITS8-2#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, point-of-sale terminals, and security system peripherals requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for LTC2935ITS8-2#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 acquired Linear Technology in 2017 and maintains its high-reliability analog IC portfolio, emphasizing precision, low power, and robust performance in harsh environments.

The LTC2935 family was designed specifically for ultra-low-power system supervision in battery-critical applications - delivering accurate, hysteresis-stabilized reset and early-warning signals with minimal impact on runtime.

FAQ

What is the function of the S2, S1, and S0 pins on the LTC2935ITS8-2#TRPBF?

The S2, S1, and S0 pins on the LTC2935ITS8-2#TRPBF are binary-encoded threshold selection inputs that configure one of eight factory-trimmed reset thresholds (e.g., 3.00V, 2.85V). Each combination of GND/VCC ties selects a specific falling-threshold voltage and its corresponding +150mV power-fail threshold. These pins require no external biasing beyond direct connection to VCC or GND.

Does the LTC2935ITS8-2#TRPBF require external pull-up resistors on RST and PFO?

No, the LTC2935ITS8-2#TRPBF does not require external pull-up resistors on RST or PFO because it belongs to the LTC2935-2 variant, which features integrated active pull-up circuitry driving both outputs to VCC. This eliminates BOM cost, board space, and potential noise coupling associated with external resistors - a key differentiator from open-drain variants like LTC2935-1.

What is the reset timeout duration for the LTC2935ITS8-2#TRPBF, and is it adjustable?

The LTC2935ITS8-2#TRPBF has a fixed 200ms reset timeout period after VCC rises above the selected reset threshold plus 5% hysteresis. This timeout is internally generated and non-adjustable - ensuring consistent, predictable reset pulse width for microcontroller initialization without external timing components or configuration overhead.

How does the power-fail output (PFO) behave relative to the reset output (RST) on the LTC2935ITS8-2#TRPBF?

On the LTC2935ITS8-2#TRPBF, the PFO output asserts low when VCC falls below a threshold fixed at +150mV above the selected reset threshold (e.g., 3.15V if RST is set to 3.00V). PFO releases when VCC rises above that same power-fail threshold plus 2.5% hysteresis. This creates a deterministic warning window before RST activates, enabling controlled shutdown procedures.

What is the maximum supply voltage the LTC2935ITS8-2#TRPBF can monitor and operate from?

The LTC2935ITS8-2#TRPBF operates from and monitors VCC over a range of 1V to 5.5V. Absolute maximum rating is 6V, but functional operation is specified up to 5.5V. This allows direct monitoring of common rails including single Li-ion (4.2V max), dual alkaline (3.2V), and regulated 3.3V or 5V supplies - with full parameter guarantees across the entire 1V–5.5V range.