Analog Devices Inc. LTC1727EMS8-5#PBF

Overview

LTC1727EMS8-5#PBF from Analog Devices is a micropower precision triple supply monitor IC in 8-lead MSOP package, designed to supervise 5V, 3.3V, and adjustable (1.0V) supply rails simultaneously. It provides individual open-drain comparator outputs (COMP5, COMP3, COMPA), a common active-low reset output (RST) with 200ms delay, ±1.5% threshold accuracy over temperature, and guaranteed RST assertion down to VCC ≥ 1V. It serves as a system-level power-good supervisor in multi-rail embedded computing platforms.

For engineers reviewing the LTC1727EMS8-5#PBF datasheet, LTC1727EMS8-5#PBF pinout, LTC1727EMS8-5#PBF application, or LTC1727EMS8-5#PBF equivalent, key selection criteria include its triple-threshold monitoring capability (VRT5 = 4.675V, VRT3 = 3.086V, VRTA = 1.000V), 10µA typical supply current, glitch-immune 200ms reset timing, and MSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC1727EMS8-5#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 –40°C to +85°C, with each comparator (COMP5, COMP3, COMPA) asserting high when its respective input exceeds its specified trip point (4.675V, 3.086V, 1.000V).

Power is autonomously sourced from the highest-potential supply among VCC5 and VCC3, ensuring RST remains valid down to 1V on either rail. The device features built-in glitch immunity: input transitions require ≥10% threshold overdrive for ≥50µs to trigger, and the 200ms reset pulse debounces transient supply dips.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic MSOP (MS8), 3.00mm × 3.00mm body, 0.65mm pitch, lead-free finish, –40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1326-5 and LTC1726-5, the LTC1727EMS8-5#PBF offers superior glitch immunity and lower 10µA supply current, making it optimal for cost-sensitive, low-power multi-rail systems where fixed 200ms reset timing suffices and VCC5 override capability is needed.

Availability

LTC1727EMS8-5#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and network servers requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for LTC1727EMS8-5#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 computing markets.

The LTC1727 product line delivers precision, low-power supply monitoring ICs optimized for multi-voltage embedded systems where reliability, accuracy, and minimal board area are essential.

FAQ

What is the exact threshold voltage for the 5V supply input on the LTC1727EMS8-5#PBF?

The LTC1727EMS8-5#PBF has a nominal VCC5 reset threshold (VRT5) of 4.675V, with guaranteed limits of 4.600V (min) and 4.750V (max) over the full –40°C to +85°C temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table of the official datasheet Rev. E.

Does the LTC1727EMS8-5#PBF support monitoring of a 1.8V supply rail?

Yes, the LTC1727EMS8-5#PBF supports 1.8V rail monitoring via its VCCA pin using an external resistor divider. The internal VCCA threshold is fixed at 1.000V (±1.5%), so a 2:1 divider (e.g., 100kΩ + 100kΩ) scales 1.8V down to 0.9V-below threshold-while a 1.8:0.9 divider yields exact match. Designers must ensure divider impedance ≤66.5kΩ to preserve accuracy.

How does the VCC5 override function work on the LTC1727EMS8-5#PBF?

The LTC1727EMS8-5#PBF disables VCC5 monitoring when VCC5 is within ±25mV of VCC3 and <4.15V, effectively operating as a 3.3V-only monitor. When VCC5 rises above ~4.15V while still near VCC3, the 5V threshold re-enables. This allows single-supply operation across 3.3V/5V systems without hardware changes-documented in the Override Functions section of the datasheet.

What is the minimum supply voltage required to guarantee correct RST output state on the LTC1727EMS8-5#PBF?

The LTC1727EMS8-5#PBF guarantees correct RST logic state (low or high) for VCC3 or VCC5 ≥ 1V. Below 1V, RST is not guaranteed and may float or behave unpredictably. This feature ensures robust reset assertion during brownout and power-down sequences where supply voltages decay below nominal levels.

Can the LTC1727EMS8-5#PBF be used in a dual-supply configuration without the adjustable input?

Yes, the LTC1727EMS8-5#PBF can monitor only two supplies by tying VCCA to either VCC3 or VCC5. In this configuration, the device functions as a dual 5V/3.3V supervisor with full RST timing and individual COMP5/COMP3 outputs. The VCCA comparator (COMPA) is disabled, but all other functionality-including 200ms reset delay and glitch immunity-remains fully operational.