Analog Devices Inc. LTC2935CDC-4#TRPBF

Overview

LTC2935CDC-4#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up 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 shutdown and system initialization.

For engineers reviewing the LTC2935CDC-4#TRPBF datasheet, LTC2935CDC-4#TRPBF pinout, LTC2935CDC-4#TRPBF application, or LTC2935CDC-4#TRPBF equivalent, key selection criteria include its active-pull-up RST/PFO outputs (eliminating external pull-ups), 200ms reset timeout, 2.5% hysteresis on PFO, 5% hysteresis on RST, and DFN-8 (2mm × 2mm) package compatibility with space-constrained designs.

Technical Context

The LTC2935CDC-4#TRPBF integrates two precision comparators: one for reset generation (VRTF) and one for power-fail warning (VPFT), with VPFT fixed at +120mV above the selected VRTF. Its internal precision attenuators enable eight discrete falling-threshold settings via S2/S1/S0 logic inputs, and it features a dedicated manual reset input (MR) with 200ms debounced release timing.

Unlike open-drain variants, the LTC2935CDC-4#TRPBF uses active-pull-up output stages tied to VCC, delivering VOH ≥ 0.7×VCC and VOL ≤ 100mV at 3mA load - enabling direct interface with CMOS logic without external resistors, while supporting valid output states down to VCC = 0V when paired with a 100kΩ pull-down resistor.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad (optional GND 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 LTC2935IDC-4#TRPBF, the LTC2935CDC-4#TRPBF trades extended temperature capability for lower cost and qualification scope in commercial applications; compared with LTC2934CTS8-4#TRPBF, it delivers faster design iteration via pin-strapping while maintaining identical ultra-low power and active-pull-up benefits.

Availability

LTC2935CDC-4#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, point-of-sale terminals, and security system peripherals requiring stable component supply and long-term lifecycle support.

Supply support for LTC2935CDC-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-performance analog IC portfolio, emphasizing precision, low power, and reliability for demanding industrial and instrumentation applications.

The LTC2935 family was designed specifically for ultra-low-power system supervision in battery-critical applications - delivering accurate, dual-threshold monitoring with minimal overhead in miniature DFN and TSOT-23 packages.

FAQ

What is the operating temperature range of the LTC2935CDC-4#TRPBF?

The LTC2935CDC-4#TRPBF is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade rating makes it suitable for indoor consumer and industrial electronics where ambient conditions remain within this range. For applications requiring operation below 0°C or above 70°C, the pin-compatible LTC2935IDC-4#TRPBF (–40°C to 85°C) is the recommended alternative. Both share identical electrical performance and pinout.

How does the LTC2935CDC-4#TRPBF differ from the LTC2935-1 or LTC2935-3 variants?

The LTC2935CDC-4#TRPBF uses active-pull-up RST and PFO outputs, meaning both pins drive high to VCC when asserted and require no external pull-up resistors. In contrast, LTC2935-1 and LTC2935-3 variants feature open-drain outputs that necessitate external pull-up resistors. This difference simplifies PCB layout, reduces component count, and avoids potential leakage issues in deep-sleep modes - a key advantage in battery-sensitive designs using the LTC2935CDC-4#TRPBF.

What is the exact reset threshold for the LTC2935CDC-4#TRPBF when S2=S1=S0=Low?

When S2, S1, and S0 are all tied to GND (Low), the LTC2935CDC-4#TRPBF configures its lowest reset threshold at 2.40V (min 2.364V, typ 2.400V, max 2.436V). Its corresponding power-fail threshold is 2.52V (2.40V + 120mV). This setting is commonly used for 2.5V system rails or Li-ion batteries nearing end-of-discharge, ensuring timely warning and reset before functional failure.

Can the LTC2935CDC-4#TRPBF operate with VCC as low as 1.0V?

Yes - the LTC2935CDC-4#TRPBF begins functional operation once VCC reaches ~1.0V, at which point RST and PFO can pull low. However, its specified reset thresholds (e.g., 2.40V) and accuracy apply only when VCC is ≥1.6V. Below 1.6V, comparator behavior is not guaranteed per datasheet specs. For valid high-state output down to VCC = 0V, a 100kΩ pull-down resistor from RST or PFO to GND is required to prevent floating logic levels.

Is the exposed pad on the LTC2935CDC-4#TRPBF's DFN package required to be connected to GND?

No - the exposed pad on the LTC2935CDC-4#TRPBF's 2mm × 2mm DFN package is optional for grounding. It may be left floating or connected to PCB GND to improve thermal dissipation and reduce noise coupling. When connected, it must be soldered to a thermally robust GND plane; when floating, ensure no unintended shorting occurs during assembly. The device functions identically in either configuration, as confirmed in the official Linear Technology datasheet revision.