Analog Devices Inc. LTC2935CDC-2#TRPBF

Overview

LTC2935CDC-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, configurable 8-level reset thresholds (2.25V–3.30V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning shutdown and system initialization.

For engineers reviewing the LTC2935CDC-2#TRPBF datasheet, LTC2935CDC-2#TRPBF pinout, LTC2935CDC-2#TRPBF application, or LTC2935CDC-2#TRPBF equivalent, key selection considerations include its active-pull-up RST/PFO outputs (eliminating external pull-ups), 200ms reset timeout, 8-pin DFN (2mm × 2mm) package, and precise hysteresis (5% on reset, 2.5% on PFO) for noise-immune operation in low-voltage systems.

Technical Context

The LTC2935CDC-2#TRPBF integrates two precision comparators: one for reset generation (VRTF) and one for early power-fail warning (VPFT), with VPFT fixed at +150mV above the selected VRTF. Its internal attenuators and reference circuitry enable eight discrete threshold settings via S2/S1/S0 logic inputs, all validated across –40°C to 85°C for industrial-grade reliability.

Unlike open-drain variants, the LTC2935CDC-2#TRPBF uses active-pull-up output drivers sourcing current to VCC, ensuring valid high-state logic even when VCC drops near ground - provided a 100kΩ external pull-down resistor is used to prevent floating. The MR input includes a 900kΩ internal pull-up and supports manual reset with 200ms debounced release timing.

Key Specifications

Pinout & Package

Package: 8-lead, 2mm × 2mm plastic DFN (DC package) with exposed pad (optional GND connection). 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 LTC2935CDC-2#TRPBF offers identical electrical behavior in a larger DFN package optimized for thermal performance and hand-soldering; versus LTC2934CDC-2#TRPBF, it trades resistor-based adjustability for simpler, more robust pin-strapped configuration.

Availability

LTC2935CDC-2#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, security system peripherals, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature-grade performance.

Supply support for LTC2935CDC-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 robustness for mission-critical applications.

The LTC2935 family is part of Linear's ultra-low-power supervisor product line, engineered specifically for energy-constrained systems where battery longevity, deterministic reset timing, and early power-fail detection are essential - such as portable medical devices and industrial IoT endpoints.

FAQ

What is the operating temperature range for the LTC2935CDC-2#TRPBF?

The LTC2935CDC-2#TRPBF is specified for operation from 0°C to 70°C (Commercial grade). This is confirmed in the "ORDER INFORMATION" table on page 2 of the datasheet, where "LTC2935CDC-2#TRPBF" is explicitly listed with "0°C to 70°C" under Temperature Range. It uses the DC (2mm × 2mm DFN) package and carries the "C" suffix denoting commercial temperature grade.

Does the LTC2935CDC-2#TRPBF require external pull-up resistors on RST and PFO?

No, the LTC2935CDC-2#TRPBF does not require external pull-up resistors because it features active-pull-up outputs on both RST and PFO. As stated in the "DESCRIPTION" section and "Selecting Output Logic Style" subsection, the -2 and -4 variants integrate internal pull-up devices that source current to VCC. External pull-down resistors (e.g., 100kΩ) are recommended only if valid logic levels are needed when VCC = 0V.

How is the reset threshold selected on the LTC2935CDC-2#TRPBF?

The reset threshold on the LTC2935CDC-2#TRPBF is selected using three binary inputs: S2, S1, and S0. Each combination of GND/VCC logic levels configures one of eight predefined falling thresholds between 2.25V and 3.30V. The exact mapping is given in the "Falling Threshold Selection Table" on page 1, where "LTC2935-2" column shows reset thresholds (e.g., S2=S1=S0=Low → 3.30V).

What is the relationship between the PFO and RST thresholds in the LTC2935CDC-2#TRPBF?

In the LTC2935CDC-2#TRPBF, the power-fail threshold (VPFT) is fixed at exactly 150mV above the selected reset threshold (VRTF). This is explicitly stated in the "APPLICATIONS INFORMATION" section (page 7): "In the LTC2935-1/LTC2935-2 the power-fail threshold is always 150mV higher than the configured reset threshold." This margin enables deterministic early warning before reset assertion.

Can the LTC2935CDC-2#TRPBF operate with VCC as low as 1V?

Yes, the LTC2935CDC-2#TRPBF can assert RST and PFO down to VCC = 1V, as confirmed in the "ELECTRICAL CHARACTERISTICS" table (page 3) under VOL test condition: "VCC = 1V, 200μA Pull-Up Current". However, full functionality-including accurate threshold detection and reset timeout-is guaranteed only within the specified VCC range of 1.6V to 5.5V per Absolute Maximum Ratings and Electrical Characteristics.