Analog Devices Inc. LTC2935CTS8-2#TRMPBF

Overview

LTC2935CTS8-2#TRMPBF 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 500nA quiescent current. It provides system initialization, early low-voltage warning, and reset generation for battery-powered systems operating from 1.6V to 5.5V supply. Its 200ms reset timeout and ±1.5% threshold accuracy over –40°C to 85°C make it suitable for portable medical devices requiring reliable brownout protection.

For engineers reviewing the LTC2935CTS8-2#TRMPBF datasheet, LTC2935CTS8-2#TRMPBF pinout, LTC2935CTS8-2#TRMPBF application, or LTC2935CTS8-2#TRMPBF equivalent, key selection criteria include its TSOT-23-8 package, active-pull-up output logic, eight binary-configurable reset thresholds (e.g., 2.40V/2.55V), and guaranteed 5% hysteresis on rising VCC - all critical for low-power embedded reset architecture design.

Technical Context

The LTC2935CTS8-2#TRMPBF integrates dual precision comparators with internal attenuators and a 200ms reset timer. Its reset comparator triggers when VCC falls below one of eight user-selected thresholds (2.25V–3.30V), while the power-fail comparator activates at a fixed 150mV higher level to provide early warning before reset assertion.

It uses active pull-up output drivers referenced to VCC (not open-drain), eliminating external pull-up resistors. Threshold selection is implemented via three logic-level inputs (S2/S1/S0), each tied to GND or VCC, enabling deterministic configuration without firmware or external components.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (ThinSOT™), 2.9mm × 1.6mm footprint, lead-free, RoHS-compliant. Exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-2#TRMPBF, the LTC2935CTS8-2#TRMPBF trades extended temperature capability for lower cost and qualification overhead in commercial-grade designs; compared with LTC2934CTS8-2#TRMPBF, it delivers faster, more deterministic threshold setup with no external components, at the expense of tunability.

Availability

LTC2935CTS8-2#TRMPBF is available at Aetrix Electronics and suitable for portable equipment, wireless sensor nodes, and point-of-sale terminals requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for LTC2935CTS8-2#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 acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full backward compatibility and long-term support.

The LTC2935CTS8-2#TRMPBF belongs to Linear's ultralow-power supervisor family, designed specifically for battery-critical applications where sub-1μA ICC, deterministic reset timing, and minimal external components are essential.

FAQ

What is the maximum supply voltage for LTC2935CTS8-2#TRMPBF?

The absolute maximum VCC rating for LTC2935CTS8-2#TRMPBF is 6V, but the recommended operating range is 1.6V to 5.5V. Operation above 5.5V risks permanent damage, while operation below 1.6V may prevent proper reset assertion due to insufficient internal biasing. The device is specified for full functionality across this 1.6V–5.5V range, including accurate threshold detection and 200ms timeout behavior.

How does the manual reset (MR) function work on LTC2935CTS8-2#TRMPBF?

When MR is pulled low (≤0.4V), LTC2935CTS8-2#TRMPBF forces RST low immediately. After MR returns high (≥0.7•VCC), RST remains low for a guaranteed 200ms before returning high - independent of VCC level. This internal timer eliminates need for external RC networks. The MR pin has an internal 900kΩ pull-up to VCC, so it can be left unconnected if unused, though a 10kΩ series resistor is recommended for ESD protection if used with a pushbutton.

What is the difference between LTC2935CTS8-2#TRMPBF and LTC2935CTS8-1#TRMPBF?

LTC2935CTS8-2#TRMPBF features active-pull-up RST and PFO outputs that drive high to VCC, whereas LTC2935CTS8-1#TRMPBF uses open-drain outputs requiring external pull-up resistors. Both share identical threshold selection, timing, and quiescent current. The -2 variant simplifies design by removing external resistors and enabling direct interfacing with CMOS logic referenced to VCC, while the -1 variant allows pull-up to voltages higher than VCC (up to 5.5V).

Can LTC2935CTS8-2#TRMPBF monitor a 1.8V supply?

Yes - LTC2935CTS8-2#TRMPBF supports reset thresholds as low as 2.25V (S2=S1=S0=High), but it cannot directly monitor a 1.8V supply because its lowest factory-configured threshold is 2.25V. For 1.8V systems, use S2=S1=S0=High to select 2.25V threshold and ensure the supply never drops below that level, or select LTC2935CTS8-3#TRMPBF/LTC2935CTS8-4#TRMPBF variants whose thresholds start at 1.60V. The device itself operates down to 1.6V VCC, but threshold selection is fixed per variant.

Is the power-fail output (PFO) of LTC2935CTS8-2#TRMPBF guaranteed to assert before RST?

Yes - for LTC2935CTS8-2#TRMPBF, the PFO threshold is fixed at exactly 150mV above the selected reset threshold (e.g., 2.55V PFO when reset is set to 2.40V). This margin is production-tested and guaranteed across temperature and voltage. PFO asserts first during VCC fall, providing a deterministic warning window before RST activation, enabling controlled shutdown sequences such as saving state or disabling peripherals before system reset.