Analog Devices Inc. LTC2935CTS8-4#TRPBF

Overview

LTC2935CTS8-4#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, active-pull-up RST/PFO outputs, and 200ms reset timeout. It delivers ±1.5% threshold accuracy over temperature, 500nA quiescent current, and operates from –40°C to 85°C in a compact 8-lead TSOT-23 package. It is used for battery voltage monitoring and controlled shutdown in portable medical devices.

For engineers reviewing the LTC2935CTS8-4#TRPBF datasheet, LTC2935CTS8-4#TRPBF pinout, LTC2935CTS8-4#TRPBF application, or LTC2935CTS8-4#TRPBF equivalent, key selection criteria include its active-pull-up output logic, eight factory-trimmed reset thresholds (1.60V–2.40V), 120mV fixed PFO-to-RST offset, 5% reset hysteresis, and compatibility with coin-cell and alkaline stack supplies.

Technical Context

The LTC2935CTS8-4#TRPBF integrates two precision comparators: one for reset generation (RST) and one for early power-fail warning (PFO), both referenced to VCC. Its internal attenuators and trimming enable eight discrete falling-threshold settings via S2/S1/S0 binary inputs, with each reset threshold paired to a fixed +120mV power-fail threshold.

It features an internal 200ms reset timeout timer activated on VCC rise, 5% hysteresis on reset release, and manual reset (MR) input with 200ms debounced release. Outputs RST and PFO are actively pulled up to VCC - eliminating external pull-up resistors and enabling valid logic levels down to VCC = 0V when used with optional ground-referenced leakage paths.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (2.9mm × 1.6mm × 0.8mm), RoHS-compliant, lead-free finish. Exposed pad not present in TSOT-23 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-4#TRPBF, the LTC2935CTS8-4#TRPBF trades extended temperature coverage for lower cost and qualification in commercial-grade applications; compared with LTC2935CTS8-2#TRPBF, it eliminates external pull-up components and reduces BOM count while constraining output voltage to VCC.

Availability

LTC2935CTS8-4#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, point-of-sale terminals, and security system peripherals requiring stable component supply and long-term battery operation.

Supply support for LTC2935CTS8-4#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-precision analog and power management product lines with rigorous automotive and industrial qualification standards.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in space-constrained portable electronics, emphasizing sub-1µA operation, factory-trimmed thresholds, and minimal external component count.

FAQ

What is the function of the S2, S1, and S0 pins on the LTC2935CTS8-4#TRPBF?

The S2, S1, and S0 pins on the LTC2935CTS8-4#TRPBF are binary-coded threshold selection inputs that configure one of eight discrete reset thresholds (1.60V–2.40V) and their corresponding power-fail thresholds (+120mV offset). Each pin is tied to GND (Low) or VCC (High) to select the desired setting per the Falling Threshold Selection Table. These pins determine the precise voltage at which the LTC2935CTS8-4#TRPBF asserts RST and PFO.

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

No, the LTC2935CTS8-4#TRPBF does not require external pull-up resistors on RST and PFO because it uses active pull-up outputs that drive high to VCC internally. This eliminates BOM items and layout area needed for pull-up resistors. However, when interfacing with high-impedance CMOS inputs and operating near VCC = 0V, a 100kΩ resistor from RST or PFO to GND is recommended to prevent floating states due to leakage currents.

What is the guaranteed reset timeout duration for the LTC2935CTS8-4#TRPBF?

The guaranteed reset timeout duration for the LTC2935CTS8-4#TRPBF is 140ms minimum to 260ms maximum over temperature, with a typical value of 200ms. This timeout begins when VCC rises above the selected reset threshold plus 5% hysteresis and holds RST low until completion, ensuring sufficient time for microcontroller power stabilization and internal register initialization before releasing the reset signal.

How does the power-fail output (PFO) behave relative to the reset output (RST) on the LTC2935CTS8-4#TRPBF?

On the LTC2935CTS8-4#TRPBF, the PFO output goes low when VCC falls below a threshold that is fixed at +120mV above the selected reset threshold (e.g., 2.55V PFO for 2.40V RST). PFO remains low until VCC rises above that same PFO threshold plus 2.5% hysteresis. This creates a deterministic early-warning window between PFO assertion and subsequent RST assertion, enabling controlled shutdown actions before system reset occurs.

Can the LTC2935CTS8-4#TRPBF operate with VCC as low as 1.0V?

Yes, the LTC2935CTS8-4#TRPBF can assert RST and PFO down to VCC = 1.0V, as confirmed by the VOL specification (25mV max at 1V/200µA). However, functional operation - including accurate threshold detection and internal comparator behavior - is only guaranteed within the specified VCC range of 1.6V to 5.5V. Below 1.6V, the LTC2935CTS8-4#TRPBF may not reliably detect or respond to threshold crossings, though output drive capability remains intact.