Analog Devices Inc. LTC2935CTS8-2#TRPBF

Overview

LTC2935CTS8-2#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 200ms reset timeout. It monitors VCC in battery-powered systems, delivers early warning via PFO before RST asserts, and operates from –40°C to 85°C in an 8-lead TSOT-23 package. Typical quiescent current is 500nA at 3.6V.

For engineers reviewing the LTC2935CTS8-2#TRPBF datasheet, LTC2935CTS8-2#TRPBF pinout, LTC2935CTS8-2#TRPBF application, or LTC2935CTS8-2#TRPBF equivalent, key selection criteria include its ±1.5% threshold accuracy over temperature, eight binary-configurable reset thresholds (e.g., 3.30V/3.15V/3.00V), 150mV fixed power-fail margin above reset threshold, active-pull-up output architecture, and compatibility with coin-cell and alkaline-stack monitoring.

Technical Context

The LTC2935CTS8-2#TRPBF integrates two precision comparators: one for reset generation (VRTF) and one for power-fail warning (VPFT), with VPFT fixed 150mV above VRTF. Its internal precision attenuators enable eight discrete falling-threshold settings without external resistors. The device uses a 5% hysteresis on rising VCC to prevent chatter and initiates a 200ms internal timer before releasing RST after threshold recovery.

As an active-pull-up variant (LTC2935-2), it drives RST and PFO high to VCC internally-eliminating external pull-up resistors-while supporting valid logic levels down to VCC = 0V when paired with a 100kΩ output-to-ground resistor. MR input includes 900kΩ internal pull-up and 20μs minimum pulse width support for manual reset assertion.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (TS8), 2.9mm × 1.6mm footprint, 0.65mm pitch, exposed pad optional. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-2#TRPBF, the LTC2935CTS8-2#TRPBF trades extended temperature range for lower cost in commercial applications; versus LTC2934CTS8#TRPBF, it delivers superior threshold accuracy and zero-resistor configuration at the expense of fixed threshold granularity.

Availability

LTC2935CTS8-2#TRPBF is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and security systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2935CTS8-2#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 portfolio, including high-reliability supervisors, with global manufacturing and quality systems certified to ISO 9001 and IATF 16949.

The LTC2935 series was designed specifically for ultra-low-power, pin-configurable voltage supervision in space-constrained, battery-critical applications - emphasizing sub-1μA operation, factory-trimmed accuracy, and dual-threshold fail-safe signaling.

FAQ

What is the function of the S2, S1, and S0 pins on the LTC2935CTS8-2#TRPBF?

The S2, S1, and S0 pins on the LTC2935CTS8-2#TRPBF are binary threshold-select inputs that configure one of eight factory-trimmed reset thresholds (2.25V to 3.30V) and corresponding power-fail thresholds. Each pin is tied to GND or VCC to set the desired combination; no external resistors or programming are required. This enables precise, repeatable voltage supervision without calibration.

How does the power-fail output (PFO) of the LTC2935CTS8-2#TRPBF differ from the reset output (RST)?

The PFO output of the LTC2935CTS8-2#TRPBF asserts low 150mV above the selected reset threshold to provide early warning of impending undervoltage, while RST asserts only when VCC falls below the reset threshold. PFO releases at +2.5% hysteresis, RST at +5% hysteresis. Both outputs use active pull-up, driving high to VCC when inactive - a key distinction from open-drain variants.

Can the LTC2935CTS8-2#TRPBF operate with VCC as low as 1.0V?

Yes, the LTC2935CTS8-2#TRPBF functions down to VCC = 1.0V: its RST and PFO outputs remain valid and can pull low even as VCC approaches ground, provided a 100kΩ pull-down resistor is used on each output to prevent floating. Output low voltage is specified at 100mV max with 200μA load, ensuring clean logic transitions in ultra-low-voltage systems.

What is the reset timeout behavior of the LTC2935CTS8-2#TRPBF after VCC recovers?

After VCC rises above the selected reset threshold plus 5% hysteresis, the LTC2935CTS8-2#TRPBF starts an internal 200ms reset timeout timer. Only after this period expires does the RST output transition high. This ensures the monitored supply remains stable long enough for microcontrollers and peripherals to initialize reliably - a deterministic timing guarantee independent of external RC networks.

Is the LTC2935CTS8-2#TRPBF pin-compatible with other variants in the LTC2935 family?

Yes, the LTC2935CTS8-2#TRPBF is pin-compatible with all TSOT-23 variants in the LTC2935 family (e.g., LTC2935CTS8-1#TRPBF, LTC2935ITS8-2#TRPBF), sharing identical 8-pin TS8 footprint, pin assignments, and electrical interface. Differences lie solely in temperature grade (C vs. I) and output type (-1/-3 = open-drain, -2/-4 = active pull-up), allowing drop-in substitution where functional requirements align.