Analog Devices Inc. LTC1727IS8-2.5#PBF

Overview

LTC1727IS8-2.5#PBF from Analog Devices is a micropower precision triple supply monitor IC in an 8-lead SO package, designed for simultaneous monitoring of 2.5V, 3.3V, and adjustable (1.0V) supplies. It features three independent open-drain comparator outputs (COMP3, COMP25, COMPA), a common active-low reset output (RST) with 200ms delay, ±1.5% threshold accuracy over temperature, and guaranteed RST assertion down to VCC3 or VCC25 ≥ 1V. It is used in notebook computers and intelligent instruments requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the LTC1727IS8-2.5#PBF datasheet, LTC1727IS8-2.5#PBF pinout, LTC1727IS8-2.5#PBF application, or LTC1727IS8-2.5#PBF equivalent, this page delivers verified specifications including VRT25 = 2.338V (typ), VRT3 = 3.086V (typ), VRTA = 1.000V (typ), tRST = 200ms (typ), and IVCC25 = 1–2µA (min–max) across –40°C to +85°C - all confirmed from Analog Devices Rev. E datasheet.

Technical Context

The LTC1727IS8-2.5#PBF implements three independent voltage comparators feeding into a 200ms reset timer and individual open-drain outputs. Its internal bandgap reference enables accurate threshold detection across temperature, while power-detect logic ensures operation from whichever supply (VCC3 or VCC25) reaches ≥1V first - critical for multi-rail systems with staggered power-up.

Each comparator (COMP3, COMP25, COMPA) asserts high when its respective input exceeds its trip point (VRT3, VRT25, VRTA), with weak internal 6µA pull-up to VCC3. The RST output remains low until all three supplies exceed their thresholds and remain valid for 200ms, providing glitch-immune microprocessor reset signaling.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic Small Outline (SO), narrow 0.150-inch body, RoHS-compliant lead-free finish, operating temperature range –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1727EMS8-2.5#PBF, the LTC1727IS8-2.5#PBF offers identical functionality in a larger SO package with better thermal dissipation, while LTC1326-2.5 trades diagnostic capability for tighter tolerance and simpler output drive - making the LTC1727IS8-2.5#PBF optimal for debug-rich, thermally stable industrial designs.

Availability

LTC1727IS8-2.5#PBF is available at Aetrix Electronics and suitable for notebook computers, intelligent instruments, network servers, and desktop computers requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for LTC1727IS8-2.5#PBF 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 since 1965.

The LTC1727IS8-2.5#PBF belongs to Analog Devices' precision power monitoring product line, engineered specifically for reliable multi-rail supervision in computing and instrumentation systems where deterministic reset timing and rail-level visibility are mission-critical.

FAQ

What is the operating temperature range for the LTC1727IS8-2.5#PBF?

The LTC1727IS8-2.5#PBF is rated for operation from –40°C to +85°C, matching the Industrial temperature grade (I-grade) specified in the Analog Devices datasheet Rev. E. This range covers most embedded computing and instrumentation environments without derating.

Does the LTC1727IS8-2.5#PBF support monitoring only 2.5V and 3.3V supplies?

No - the LTC1727IS8-2.5#PBF monitors three supplies: fixed 2.5V (VCC25), fixed 3.3V (VCC3), and an adjustable input (VCCA) with 1.000V typical threshold. VCCA can monitor any supply ≥1V using external resistive dividers, enabling flexible adaptation to 1.2V, 1.8V, or custom rails.

How does the LTC1727IS8-2.5#PBF handle power sequencing when multiple supplies ramp at different rates?

The LTC1727IS8-2.5#PBF uses autonomous power-detect logic: it operates from whichever supply (VCC3 or VCC25) first reaches ≥1V, and asserts RST low until all three monitored supplies exceed their thresholds and remain stable for 200ms - ensuring safe, sequenced processor startup even with staggered rail ramps.

Can the individual comparator outputs (COMP3, COMP25, COMPA) be used without enabling the RST function?

Yes - the COMP outputs operate independently of the RST timer. Each asserts high when its respective supply exceeds its threshold (e.g., COMP25 goes high when VCC25 > 2.338V), enabling real-time rail status monitoring in firmware without affecting reset timing or requiring RST to be connected.

What is the minimum supply voltage required to guarantee correct RST output behavior for the LTC1727IS8-2.5#PBF?

The LTC1727IS8-2.5#PBF guarantees correct RST logic state for VCC3 ≥ 1V or VCC25 ≥ 1V - meaning RST will assert low and remain valid even during deep brownout conditions where only one rail sustains ≥1V, providing fail-safe reset integrity.