Analog Devices Inc. LTC2935IDC-2#TRPBF

Overview

LTC2935IDC-2#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 portable electronics operating from –40°C to 85°C.

For engineers reviewing the LTC2935IDC-2#TRPBF datasheet, LTC2935IDC-2#TRPBF pinout, LTC2935IDC-2#TRPBF application, or LTC2935IDC-2#TRPBF equivalent, key selection considerations include its 2.25V–3.30V configurable reset thresholds, 200ms reset timeout, ±1.5% threshold accuracy over temperature, active-pull-up output architecture, and 2mm × 2mm DFN package compatibility with space-constrained designs.

Technical Context

The LTC2935IDC-2#TRPBF integrates dual precision comparators-one for reset detection and one for power-fail warning-with built-in hysteresis (5% on RST, 2.5% on PFO) and a 200ms internal reset timer. Its threshold selection logic uses three binary inputs (S2/S1/S0) to configure eight discrete falling-voltage thresholds, each paired with a fixed-margin power-fail threshold (150mV above reset threshold for LTC2935-2 variants).

As an active-pull-up variant, the LTC2935IDC-2#TRPBF drives RST and PFO high to VCC without external resistors, eliminating pull-up power loss during high-state operation. It supports manual reset via MR input with 200ms debounced release timing and operates across full industrial temperature range with guaranteed 500nA ICC at 25°C and ≤1μA over –40°C to 85°C.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic DFN (2mm × 2mm), exposed pad (optional GND connection), JEDEC-compliant footprint per LTC DWG #05-08-1719 Rev Ø.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-2#TRPBF, the LTC2935IDC-2#TRPBF offers superior thermal performance and smaller footprint; compared with LTC2934IDC#TRPBF, it delivers faster, resistor-free configuration for production-stable voltage rails without sacrificing ultra-low power or industrial temperature support.

Availability

LTC2935IDC-2#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, security systems, and point-of-sale terminals requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2935IDC-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 precision analog and power management product lines. Linear Technology was founded in 1981 and specialized in high-performance linear ICs for demanding applications.

The LTC2935 family is part of Linear Technology's ultra-low power supervisor portfolio, designed specifically for energy-constrained battery-operated systems requiring deterministic reset behavior, early power-fail warning, and minimal quiescent current across industrial temperature ranges.

FAQ

What is the function of the S2, S1, and S0 pins on the LTC2935IDC-2#TRPBF?

The S2, S1, and S0 pins on the LTC2935IDC-2#TRPBF are binary-coded threshold selection inputs that configure one of eight discrete reset thresholds (2.25V–3.30V) and corresponding power-fail thresholds (+150mV above reset). Each combination of high/low states selects a specific pair from the Falling Threshold Selection Table; tying all three to GND selects the highest threshold (3.30V reset / 3.45V PFO), while tying all three to VCC selects the lowest (2.25V reset / 2.40V PFO). These pins require no external logic and operate directly from VCC or GND.

How does the power-fail output (PFO) behave relative to the reset output (RST) on the LTC2935IDC-2#TRPBF?

On the LTC2935IDC-2#TRPBF, the PFO output asserts low when VCC falls below a power-fail threshold that is fixed at +150mV above the selected reset threshold, providing early warning before RST triggers. PFO releases when VCC rises above that power-fail threshold plus 2.5% hysteresis, whereas RST releases only after VCC exceeds the reset threshold plus 5% hysteresis and a 200ms internal timer expires. This staggered timing ensures the system has time to execute controlled shutdown procedures-such as saving data or sequencing supplies-before the hard reset occurs.

Does the LTC2935IDC-2#TRPBF require external pull-up resistors on its RST and PFO outputs?

No, the LTC2935IDC-2#TRPBF does not require external pull-up resistors because it features active-pull-up outputs (as indicated by the "-2" suffix). Both RST and PFO are driven high to VCC internally, eliminating standby current through external resistors and simplifying interface to CMOS logic. If interfacing with high-impedance inputs (e.g., microcontroller GPIOs), a 100kΩ pull-down resistor from RST or PFO to GND is recommended to prevent floating states during VCC ramp-up or brownout conditions, but this is optional-not required for basic operation.

What is the guaranteed accuracy of the reset threshold for the LTC2935IDC-2#TRPBF over temperature?

The LTC2935IDC-2#TRPBF guarantees ±1.5% maximum reset threshold accuracy over its full operating temperature range of –40°C to 85°C. This specification applies to all eight selectable thresholds (e.g., 2.25V, 2.40V, 2.55V, ..., 3.30V) and is validated across process variation and temperature extremes-not just at 25°C. The accuracy ensures reliable reset assertion without false triggering during thermal cycling, making it suitable for industrial and automotive-adjacent applications where ambient temperature swings are significant.

Can the LTC2935IDC-2#TRPBF monitor a supply voltage lower than 2.25V?

No, the LTC2935IDC-2#TRPBF cannot monitor supply voltages below 2.25V because its lowest factory-configured reset threshold is 2.25V (selected when S2=S1=S0=High). The device's internal precision attenuators and comparator architecture are optimized for the 2.25V–3.30V range. For sub-2.25V supervision (e.g., 1.8V or 1.2V rails), alternative solutions such as the LTC2915/LTC2916 family-which offer 27 pin-selectable thresholds down to 0.4V-or resistor-adjustable supervisors like the LTC2934 should be considered. The LTC2935IDC-2#TRPBF's absolute maximum VCC rating is 6V, but functional supervision is limited to its specified threshold range.