Analog Devices Inc. LTC2935CDC-3#TRPBF

Overview

LTC2935CDC-3#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with open-drain reset and power-fail outputs, eight pin-selectable reset thresholds (1.60V–2.40V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning low-voltage detection and system reset.

For engineers reviewing the LTC2935CDC-3#TRPBF datasheet, LTC2935CDC-3#TRPBF pinout, LTC2935CDC-3#TRPBF application, or LTC2935CDC-3#TRPBF equivalent, key selection considerations include its 200ms reset timeout, 120mV fixed power-fail hysteresis above selected reset threshold, manual reset input with 20μs minimum pulse width, open-drain output compatibility with pull-up voltages up to 5.5V, and operation across 0°C to 70°C ambient.

Technical Context

The LTC2935CDC-3#TRPBF integrates two precision comparators: one for reset generation at a user-configured falling VCC threshold (eight options via S2/S1/S0), and a second for early power-fail warning at a fixed 120mV higher threshold. Its internal 5% hysteresis on reset release and 2.5% hysteresis on PFO release prevent output chatter during supply transients.

It features a 200ms internal reset timer that delays RST high after VCC exceeds the threshold, plus a manual reset input (MR) with internal 900kΩ pull-up and 20μs minimum pulse width requirement. The device operates from 1V to 5.5V VCC and draws only 500nA typical supply current - enabling multi-year battery life in coin-cell applications.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad optional for thermal relief or grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-3#TRPBF, the LTC2935CDC-3#TRPBF offers identical electrical performance in a smaller 2mm × 2mm DFN footprint but limits ambient operation to 0°C–70°C; compared with LTC2934CDC-3#TRPBF, it eliminates external resistors and simplifies layout at the cost of discrete threshold selection granularity.

Availability

LTC2935CDC-3#TRPBF is available at Aetrix Electronics and suitable for portable equipment, battery-powered instrumentation, point-of-sale devices, and wireless sensor nodes requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for LTC2935CDC-3#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 LTC2935CDC-3#TRPBF belongs to Linear's ultralow-power supervisor family, engineered specifically for energy-constrained battery-operated systems where minimizing standby current and ensuring deterministic power-fail response are primary design goals.

FAQ

What is the maximum VCC voltage rating for the LTC2935CDC-3#TRPBF?

The LTC2935CDC-3#TRPBF has an absolute maximum VCC rating of 6V, but its specified operating range is 1V to 5.5V. Operation above 5.5V risks violating recommended conditions and may impact long-term reliability or threshold accuracy. Always maintain VCC within 1V–5.5V for guaranteed performance per the datasheet.

How does the power-fail threshold relate to the selected reset threshold in the LTC2935CDC-3#TRPBF?

In the LTC2935CDC-3#TRPBF, the power-fail threshold is fixed at exactly 120mV above the selected reset threshold - for example, if S2/S1/S0 configure a 2.40V reset point, PFO asserts at 2.52V. This differential is factory-trimmed and remains stable across temperature and supply voltage, providing predictable early-warning margin without external components.

Can the LTC2935CDC-3#TRPBF operate with VCC down to 1V, and what happens to outputs at that level?

Yes, the LTC2935CDC-3#TRPBF functions down to VCC = 1V. At this voltage, RST and PFO can still pull low (VOL ≤100mV at 200μA load), but they cannot actively drive high - instead, external pull-up resistors define the high state. Output logic remains valid, enabling use in ultra-low-voltage battery end-of-life detection.

What is the purpose of the 5% hysteresis on the reset threshold release in the LTC2935CDC-3#TRPBF?

The 5% hysteresis on reset release in the LTC2935CDC-3#TRPBF prevents output oscillation during slow-rising or noisy supply conditions. After VCC drops below the threshold and RST goes low, RST only returns high once VCC exceeds the threshold by 5% - e.g., a 2.40V threshold requires VCC ≥2.52V to release RST. This ensures stable MCU initialization without repeated resets.

Is the MR (manual reset) input of the LTC2935CDC-3#TRPBF compatible with direct connection to a pushbutton switch to ground?

Yes - the MR input of the LTC2935CDC-3#TRPBF is designed for direct pushbutton-to-ground connection. It features an internal 900kΩ pull-up to VCC and recognizes logic-low pulses ≥20μs wide. For ESD protection in handheld devices, adding a 10kΩ series resistor between the switch and MR is recommended per the datasheet.