Analog Devices Inc. LTC2935CTS8-4#TRMPBF

Overview

LTC2935CTS8-4#TRMPBF from Analog Devices (acquired Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up reset and power-fail outputs, 500nA quiescent current, ±1.5% threshold accuracy over temperature, and eight pin-selectable reset thresholds ranging from 1.60V to 2.40V. It serves as a system initialization and battery health monitor in portable coin-cell and alkaline-powered devices.

For engineers reviewing the LTC2935CTS8-4#TRMPBF datasheet, LTC2935CTS8-4#TRMPBF pinout, LTC2935CTS8-4#TRMPBF application, or LTC2935CTS8-4#TRMPBF equivalent, key selection criteria include its TSOT-23-8 package, 0°C to 70°C operating range, active-pull-up RST/PFO outputs, 200ms reset timeout, and precise 120mV power-fail margin above configured reset thresholds.

Technical Context

The LTC2935CTS8-4#TRMPBF implements dual independent comparators: one for reset generation at a user-selected falling threshold (e.g., 2.40V), and another for early warning at a fixed 120mV higher power-fail threshold (e.g., 2.52V). Its internal precision attenuators and hysteresis (5% on RST, 2.5% on PFO) eliminate external components for noise immunity.

It features a manual reset input with 200ms debounced release timing, operates down to 1V supply, and delivers active-pull-up outputs referenced to VCC - eliminating external pull-up resistors while restricting output voltage to ≤VCC. Threshold selection uses three logic-level inputs (S2/S1/S0) tied to GND or VCC.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (2.9mm × 1.6mm × 0.8mm), 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 LTC2935ITS8-4#TRMPBF, the LTC2935CTS8-4#TRMPBF trades extended temperature capability for cost and qualification simplicity in commercial-grade applications; versus LTC2934CTS8-4#TRMPBF, it offers faster, more robust threshold configuration without resistor tolerance errors or layout sensitivity.

Availability

LTC2935CTS8-4#TRMPBF is available at Aetrix Electronics and suitable for battery-powered medical sensors, wireless point-of-sale terminals, and security system keypads requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for LTC2935CTS8-4#TRMPBF 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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC2935 product line was developed by Linear Technology (acquired by ADI in 2017) to deliver ultra-low-power, precision voltage supervision for portable and energy-constrained systems - emphasizing minimal quiescent current, pin-configurable thresholds, and integrated hysteresis without external components.

FAQ

What is the operating temperature range for the LTC2935CTS8-4#TRMPBF?

The LTC2935CTS8-4#TRMPBF is specified for an operating ambient temperature range of 0°C to 70°C. This commercial-grade rating makes it suitable for indoor consumer electronics, handheld instruments, and controlled-environment industrial devices. It is not rated for extended industrial or automotive temperature ranges - for those applications, the LTC2935ITS8-4#TRMPBF (–40°C to 85°C) is the appropriate variant. The datasheet confirms this range in the "Order Information" table and "Absolute Maximum Ratings" section.

How does the power-fail threshold relate to the reset threshold in the LTC2935CTS8-4#TRMPBF?

In the LTC2935CTS8-4#TRMPBF, the power-fail threshold is fixed at +120mV above the selected reset threshold - for example, choosing a 2.40V reset threshold configures the PFO to trigger at 2.52V. This differential is inherent to the LTC2935-3/LTC2935-4 variant family and is confirmed in the "Applications Information" section and "Falling Threshold Selection Table." Unlike the -1/-2 variants (which use +150mV), the -4 version maintains consistent 120mV separation across all eight threshold settings.

Does the LTC2935CTS8-4#TRMPBF require external pull-up resistors on RST and PFO?

No, the LTC2935CTS8-4#TRMPBF does not require external pull-up resistors because it features active-pull-up outputs on both RST and PFO - a defining characteristic of the "-4" suffix variant. These outputs drive high to VCC internally, eliminating external components and reducing BOM count. However, if interfacing with high-impedance CMOS inputs while VCC is near 0V, a 100kΩ pull-down resistor from RST or PFO to GND is recommended to prevent floating states, as noted in the "Applications Information" section.

What is the reset timeout duration for the LTC2935CTS8-4#TRMPBF, and how is it implemented?

The LTC2935CTS8-4#TRMPBF provides a guaranteed 200ms reset timeout period after VCC rises above the selected reset threshold plus 5% hysteresis. This delay is generated by an internal RC timer (900kΩ + C) and is production-tested per the Electrical Characteristics table (tRST = 140ms to 260ms, typ. 200ms). It ensures microcontrollers and FPGAs have sufficient time to stabilize clocks and initialize peripherals before release from reset - no external capacitor or timing component is needed.

Can the LTC2935CTS8-4#TRMPBF monitor voltages below 1.6V?

No, the LTC2935CTS8-4#TRMPBF cannot monitor voltages below 1.60V, as that is the lowest pin-selectable reset threshold (S2=S1=S0=High). Its eight factory-trimmed thresholds span 1.60V to 2.40V in 120mV steps, optimized for single- and dual-cell battery systems. For sub-1.6V supervision (e.g., 1.2V LiFePO₄ or supercapacitor monitoring), alternative solutions like the LTC2915 family (27-pin-selectable thresholds down to 0.4V) or adjustable supervisors such as the LTC2934 are required - the LTC2935CTS8-4#TRMPBF's architecture does not support extension below its defined range.