Analog Devices Inc. LTC1727ES8-2.5#TRPBF

Overview

LTC1727ES8-2.5#TRPBF from Analog Devices is a micropower precision triple supply monitor IC in an 8-lead SO package, designed to simultaneously monitor 2.5V, 3.3V, and an adjustable supply (VCCA) with ±1.5% threshold accuracy over temperature. It provides three individual open-drain comparator outputs (COMP25, COMP3, COMPA) and a common active-low reset output (RST) with 200ms delay, ensuring reliable power-up sequencing in multi-rail systems such as notebook computers and intelligent instruments.

For engineers reviewing the LTC1727ES8-2.5#TRPBF datasheet, LTC1727ES8-2.5#TRPBF pinout, LTC1727ES8-2.5#TRPBF application, or LTC1727ES8-2.5#TRPBF equivalent, key selection criteria include its guaranteed RST assertion down to VCC3 ≥ 1V or VCC25 ≥ 1V, 10µA typical supply current, glitch-immune undervoltage detection, and compatibility with 2.5V/3.3V/adjustable rail monitoring architectures.

Technical Context

The LTC1727ES8-2.5#TRPBF implements independent comparators for VCC25 (2.5V rail), VCC3 (3.3V rail), and VCCA (adjustable rail), each driving dedicated open-drain outputs with weak internal pull-ups to VCC3. Its reset logic asserts RST low until all three monitored supplies exceed their respective thresholds-VRT25 = 2.338V (±1.5%), VRT3 = 3.086V (±1.5%), and VRTA = 1.000V (±1.5%)-and remain valid for 200ms.

Power is autonomously sourced from the highest-potential supply among VCC3 and VCC25, enabling correct RST behavior during brownout and power-down transitions. The device guarantees functional reset operation even when VCC3 or VCC25 drops to 1V, and includes built-in glitch immunity via 50µs minimum overdrive requirement and integrated 200ms pulse generation.

Key Specifications

Pinout & Package

The LTC1727ES8-2.5#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150-inch narrow body, with standard JEDEC MS-012AC footprint and lead finish compliant with RoHS and lead-free requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-supply monitoring applications.

Compared with LTC1326-2.5 and LTC1726-2.5, the LTC1727ES8-2.5#TRPBF offers unique value through its combination of ±1.5% accuracy, dedicated per-rail comparator outputs, and ultra-low 10µA supply current-making it optimal for cost-sensitive, space-constrained designs requiring visibility into each monitored rail without added complexity.

Availability

LTC1727ES8-2.5#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1727ES8-2.5#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC1727 series belongs to Analog Devices' precision power monitoring product line, engineered specifically for reliable multi-rail supervision in computing, instrumentation, and network infrastructure where deterministic reset timing and rail-by-rail visibility are critical.

FAQ

What is the exact threshold voltage for the 2.5V supply input on the LTC1727ES8-2.5#TRPBF?

The LTC1727ES8-2.5#TRPBF has a nominal VCC25 reset threshold of 2.338V, specified with ±1.5% accuracy over the full –40°C to 85°C operating temperature range. This value is confirmed in the Electrical Characteristics table under symbol VRT25 and applies specifically to the LTC1727-2.5 variant, which matches the part number LTC1727ES8-2.5#TRPBF.

Does the LTC1727ES8-2.5#TRPBF provide individual comparator outputs for each monitored supply?

Yes, the LTC1727ES8-2.5#TRPBF provides three dedicated open-drain comparator outputs: COMP25 (Pin 7) for the 2.5V rail, COMP3 (Pin 8) for the 3.3V rail, and COMPA (Pin 1) for the adjustable supply (VCCA). Each output is active-high and features a weak internal pull-up to VCC3, enabling direct connection to microcontroller GPIOs for real-time rail status monitoring.

What is the minimum operating voltage required to guarantee correct RST output behavior for the LTC1727ES8-2.5#TRPBF?

The LTC1727ES8-2.5#TRPBF guarantees correct RST logic state down to VCC3 ≥ 1V or VCC25 ≥ 1V. This means the device will assert RST low and maintain proper reset functionality even during deep brownout conditions, as long as at least one of these supply pins remains at or above 1V-critical for fail-safe operation in power-sensitive systems.

Can the LTC1727ES8-2.5#TRPBF monitor only two supplies instead of three?

Yes, the LTC1727ES8-2.5#TRPBF can be configured to monitor one or two supplies. Unused inputs like VCCA may be tied to VCC3 or VCC25 without affecting accuracy, and the RST output remains valid as long as the enabled rails meet their thresholds. This flexibility is explicitly supported in the Applications Information section and enables reuse in dual-rail systems without redesign.

What package type and lead count does the LTC1727ES8-2.5#TRPBF use?

The LTC1727ES8-2.5#TRPBF uses an 8-lead plastic SO (Small Outline) package, also referred to as S8 or SO-8, with a 0.150-inch narrow body. This package is RoHS-compliant, lead-free, and compatible with standard surface-mount assembly processes, as documented in the Package Description section of the official Analog Devices datasheet Rev. E.