Analog Devices Inc. LTC2935CDC-1#TRPBF

Overview

LTC2935CDC-1#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, open-drain RST/PFO outputs, and 500nA typical quiescent current. It provides system initialization, early low-voltage warning, and reset generation for battery-powered portable equipment operating from 1.6V to 5.5V supply rails.

For engineers reviewing the LTC2935CDC-1#TRPBF datasheet, LTC2935CDC-1#TRPBF pinout, LTC2935CDC-1#TRPBF application, or LTC2935CDC-1#TRPBF equivalent, key selection criteria include its ±1.5% threshold accuracy over temperature, eight binary-configurable reset thresholds (e.g., 2.25V–2.40V range), 200ms reset timeout, manual reset input with 20μs minimum pulse width, and compatibility with 2mm × 2mm DFN packaging for space-constrained designs.

Technical Context

The LTC2935CDC-1#TRPBF integrates two precision comparators: one for reset detection (VRTF) and one for early power-fail warning (VPFT), with VPFT fixed 120mV above VRTF for the -3/-4 variants. Its internal precision attenuators enable accurate threshold selection across eight combinations of S2/S1/S0 inputs without external resistors.

It features built-in 5% hysteresis on the reset comparator and 2.5% hysteresis on the power-fail comparator to prevent output chatter during supply transients. The device operates from –40°C to 85°C (I-grade), supports VCC monitoring down to 1V for valid output behavior, and delivers guaranteed 200ms reset timeout with ±30ms variation over temperature.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad (optional GND connection), RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-1#TRPBF, the LTC2935CDC-1#TRPBF offers superior thermal performance and smaller footprint; compared with LTC2934CMS8-1#TRPBF, it eliminates external resistors and guarantees precise 120mV PFO margin - critical for deterministic shutdown sequencing.

Availability

LTC2935CDC-1#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, security system peripherals, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2935CDC-1#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in space- and energy-constrained applications, emphasizing sub-1μA operation, high-accuracy thresholds, and integrated early-warning capability without external components.

FAQ

What is the operating temperature range for the LTC2935CDC-1#TRPBF?

The LTC2935CDC-1#TRPBF is rated for 0°C to 70°C ambient operation (C-grade). This is confirmed in the "ORDER INFORMATION" table on page 2 of the datasheet, where "LTC2935CDC-1#TRPBF" is explicitly listed with "0°C to 70°C" under Temperature Range. It uses the same silicon die as the I-grade variant but is tested and binned to the commercial temperature specification.

Does the LTC2935CDC-1#TRPBF support adjustable reset thresholds via external resistors?

No, the LTC2935CDC-1#TRPBF does not support resistor-based threshold adjustment. It implements eight fixed, pin-selectable reset thresholds (e.g., 2.25V, 2.40V, 2.55V…) determined solely by the logic states of S2/S1/S0. This is distinct from the LTC2934, which requires external resistors - a key differentiator confirmed in the "FEATURES" and "APPLICATIONS INFORMATION" sections of the datasheet.

What is the power-fail threshold offset relative to the reset threshold for the LTC2935CDC-1#TRPBF?

The LTC2935CDC-1#TRPBF belongs to the LTC2935-1/2 variant group, where the power-fail threshold (VPFT) is fixed 150mV above the selected reset threshold (VRTF). This is documented in the "Falling Threshold Selection Table" on page 1 and confirmed in the "Power-Fail Thresholds (LTC2935-1/LTC2935-2)" section of the Electrical Characteristics table on page 3 (ΔVPFT = 100–200mV, typ 150mV).

Can the RST and PFO outputs of the LTC2935CDC-1#TRPBF be pulled up to a voltage higher than VCC?

Yes, the RST and PFO outputs of the LTC2935CDC-1#TRPBF are open-drain and rated for up to 6V, allowing pull-up to voltages exceeding VCC (e.g., 5V logic rail while VCC = 3.3V). This capability is specified in the "ABSOLUTE MAXIMUM RATINGS" table (page 2) and highlighted in the "Selecting Output Logic Style" section (page 8) as a key advantage over competing supervisors with internal clamps.

Is the exposed pad on the LTC2935CDC-1#TRPBF's DFN package required to be connected to ground?

No, the exposed pad on the LTC2935CDC-1#TRPBF's DC package is optional per the "PIN FUNCTIONS" section on page 5: "Exposed Pad (DFN Only): Exposed Pad may be left floating or connected to device ground." While grounding improves thermal dissipation and EMI performance, it is not electrically mandatory for functional operation - confirmed by the "OPTIONAL" designation and absence of any electrical specification dependency in the Absolute Maximum Ratings or Electrical Characteristics tables.