Analog Devices Inc. LTC2934CDC-1

Overview

LTC2934CDC-1 from Analog Devices (formerly Linear Technology) is an ultra-low power, adjustable voltage supervisor IC with independent power-fail and reset functions, 500nA typical quiescent current, ±1.5% threshold accuracy over temperature, and operation down to 1.6V supply - used in battery-powered portable equipment for early low-voltage warning and controlled system reset.

For engineers reviewing the LTC2934CDC-1 datasheet, LTC2934CDC-1 pinout, LTC2934CDC-1 application, or LTC2934CDC-1 equivalent, key selection criteria include its open-drain PFO/RST outputs, 15ms/200ms selectable reset timeout, 0.4V internal reference, ADJ/PFI threshold adjustability via external resistive dividers, and DFN-8 (2mm × 2mm) package compatibility with space-constrained designs.

Technical Context

The LTC2934CDC-1 integrates two independent comparators: one monitoring the ADJ input for reset generation (threshold = 400mV ±6mV), and another monitoring PFI for power-fail detection (same 400mV threshold). Each comparator features built-in hysteresis - 5% for ADJ (20mV typ), 2.5% for PFI (10mV typ) - ensuring noise immunity during voltage transients.

Its RT pin selects between two fixed reset timeout periods (15ms when RT = GND; 200ms when RT = VCC), while MR provides manual reset with 20μs minimum pulse width and internal 900kΩ pull-up. Outputs RST and PFO are open-drain (LTC2934-1 variant), supporting flexible voltage-level interfacing up to 5.5V.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad optional for thermal/ground 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 LTC2934CDC-1, LTC2935IDC-1 trades external resistor flexibility for pin-strapped simplicity and identical ultra-low power, while LTC2909IDC-1 adds multi-supply capability at 3× higher quiescent current - making LTC2934CDC-1 optimal for cost-sensitive, single-rail, long-life battery applications.

Availability

LTC2934CDC-1 is available at Aetrix Electronics and suitable for portable medical sensors, wireless point-of-sale terminals, and industrial security keypads requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2934CDC-1 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, manufacturing, and documentation for the LTC portfolio.

The LTC2934 belongs to Linear's ultralow-power supervisor family, designed specifically for battery-critical applications where nanoscale current draw and precise, configurable reset/power-fail thresholds are essential.

FAQ

What is the operating temperature range for the LTC2934CDC-1?

The LTC2934CDC-1 is specified for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix in the part number. This distinguishes it from the "I" grade (–40°C to 85°C) variants like LTC2934IDC-1. The DFN-8 package has a θJA of 102°C/W, supporting reliable thermal performance within this commercial temperature range.

How does the LTC2934CDC-1 differ from the LTC2934CTS8-1?

The LTC2934CDC-1 uses an 8-lead 2mm × 2mm plastic DFN package, while LTC2934CTS8-1 uses an 8-lead TSOT-23 package. Both share identical electrical specifications and the "-1" open-drain output configuration, but the DFN offers lower thermal resistance (θJA = 102°C/W vs. 195°C/W) and smaller footprint - critical for ultra-compact designs where board space is constrained.

Can the LTC2934CDC-1 monitor two different supply rails simultaneously?

Yes - the LTC2934CDC-1 can monitor two rails using separate resistive dividers on ADJ and PFI inputs. Figure 2 in the datasheet shows dual-voltage biasing with four resistors. However, both comparators share the same 400mV internal threshold, so each rail's falling threshold must be scaled accordingly (e.g., 3.3V rail → 8.25:1 divider; 5V rail → 12.5:1 divider) to hit 400mV at the desired trip point.

What is the maximum allowable voltage on the PFO and RST pins of the LTC2934CDC-1?

As an LTC2934-1 variant, the LTC2934CDC-1 features open-drain outputs rated for –0.3V to 6V. This means PFO and RST can be safely pulled up to any voltage ≤6V - including levels higher than VCC (e.g., 5V pull-up while VCC = 3.3V) - enabling interoperability with mixed-voltage logic families without level shifters.

Is there a recommended decoupling capacitor for the LTC2934CDC-1 VCC pin?

Yes - a 0.1μF ceramic capacitor placed between VCC and GND, as close as possible to the device pins, is explicitly recommended in the datasheet. This minimizes supply noise coupling into the precision comparators and ensures stable operation during fast load transients, especially critical given the sub-1μA supply current sensitivity.