Analog Devices Inc. LTC2935ITS8-4#TRPBF

Overview

LTC2935ITS8-4#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, active-pull-up RST/PFO outputs, and 500nA quiescent current. It provides system reset generation, early power-fail warning, and manual reset functionality for battery-powered systems operating from –40°C to 85°C.

For engineers reviewing the LTC2935ITS8-4#TRPBF datasheet, LTC2935ITS8-4#TRPBF pinout, LTC2935ITS8-4#TRPBF application, or LTC2935ITS8-4#TRPBF equivalent, key selection considerations include its eight programmable reset thresholds (1.60V–2.40V), fixed +120mV power-fail margin, 200ms reset timeout, ±1.5% threshold accuracy over temperature, and TSOT-23-8 package compatibility with space-constrained portable designs.

Technical Context

The LTC2935ITS8-4#TRPBF integrates dual precision comparators-one for reset (VRTF) and one for power-fail (VPFT)-with independent hysteresis (5% for RST, 2.5% for PFO) and internal timing control. Its threshold selection logic uses three binary inputs (S2/S1/S0) to configure one of eight factory-trimmed falling thresholds, with VPFT always 120mV above VRTF for the -3/-4 variants.

It employs active pull-up output drivers (LTC2935-4 variant), eliminating external pull-up resistors and enabling direct interfacing with CMOS logic powered by VCC. The MR input features internal 900kΩ pull-up and 20μs minimum pulse width support, while undervoltage glitch immunity ensures robust operation under transient supply noise.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (TS8), 2.9mm × 1.6mm footprint, –40°C to 85°C operating range. 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 LTC2935ITS8-3#TRPBF, the LTC2935ITS8-4#TRPBF eliminates pull-up resistors and simplifies BOM, while LTC2934ITS8-4#TRPBF trades pin-select simplicity for analog adjustability-making LTC2935ITS8-4#TRPBF optimal for production designs with stable, standardized voltage rails.

Availability

LTC2935ITS8-4#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, point-of-sale terminals, and security system peripherals requiring stable component supply across extended product lifecycles.

Supply support for LTC2935ITS8-4#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 precision analog and power management portfolio. Linear's legacy design ethos emphasizes ultra-low power, high accuracy, and robustness in harsh environments.

The LTC2935ITS8-4#TRPBF belongs to Linear's ultralow-power supervisor family, engineered specifically for battery-critical applications where nanoscale current draw, factory-trimmed accuracy, and deterministic power-fail timing are non-negotiable.

FAQ

What is the reset threshold accuracy of the LTC2935ITS8-4#TRPBF over temperature?

The LTC2935ITS8-4#TRPBF guarantees ±1.5% maximum reset threshold accuracy across its full operating temperature range of –40°C to 85°C. This specification is production-tested and applies to all eight pin-selectable thresholds, ensuring reliable brownout detection without calibration in industrial or outdoor deployments.

How does the power-fail output (PFO) behave relative to the reset output (RST) in the LTC2935ITS8-4#TRPBF?

In the LTC2935ITS8-4#TRPBF, the PFO output asserts low when VCC falls below a threshold that is fixed at +120mV above the selected reset threshold (VRTF). PFO releases when VCC rises to VPFT + 2.5% hysteresis, while RST releases only after VCC exceeds VRTF + 5% and the 200ms timeout completes-providing deterministic early warning before system reset.

Can the LTC2935ITS8-4#TRPBF operate with VCC down to 0V and still provide valid outputs?

Yes-the LTC2935ITS8-4#TRPBF's active pull-up outputs remain functional as VCC declines to 0V. When VCC is near ground, RST and PFO are pulled low via internal NMOS devices. To prevent floating states on high-impedance inputs, a 100kΩ external pull-down resistor from each output to GND is recommended per Linear's application guidance.

What is the minimum pulse width required on the MR input to trigger a manual reset in the LTC2935ITS8-4#TRPBF?

The MR input of the LTC2935ITS8-4#TRPBF requires a minimum low pulse width of 20μs to reliably initiate a manual reset. This specification is guaranteed over temperature and ensures immunity to contact bounce or ESD transients. The internal 900kΩ pull-up resistor returns MR to VCC when the pushbutton is released.

Does the LTC2935ITS8-4#TRPBF require external components for basic operation?

No-only a 0.1μF ceramic decoupling capacitor between VCC and GND is required for stable operation of the LTC2935ITS8-4#TRPBF. Unlike open-drain variants, the active pull-up outputs eliminate external pull-up resistors, and pin-selectable thresholds remove the need for external resistor dividers, enabling true "zero-component" supervision in space-constrained designs.