Analog Devices Inc. LTC1727EMS8-5#TRPBF

Overview

LTC1727EMS8-5#TRPBF from Analog Devices is a micropower precision triple supply monitor in 8-lead MSOP package, designed for systems requiring simultaneous monitoring of 5V, 3.3V, and an adjustable supply. It features ±1.5% threshold accuracy over temperature, 10µA typical supply current, 200ms reset delay, and individual open-drain comparator outputs (COMP3, COMP5, COMPA) plus a common active-low RST output. It is used in notebook computers and intelligent instruments where reliable power-up sequencing and brownout detection are critical.

For engineers reviewing the LTC1727EMS8-5#TRPBF datasheet, LTC1727EMS8-5#TRPBF pinout, LTC1727EMS8-5#TRPBF application, or LTC1727EMS8-5#TRPBF equivalent, key selection considerations include its triple-supply monitoring capability with independent comparator outputs, guaranteed RST assertion down to 1V on any monitored rail, glitch immunity, and compatibility with 3.3V/5V system logic interfaces via open-drain outputs with weak internal pull-ups to VCC3.

Technical Context

The LTC1727EMS8-5#TRPBF implements three independent voltage comparators feeding into a 200ms reset timer and individual open-drain outputs. Its power-detect architecture allows operation from whichever of VCC3 (3.3V) or VCC5 (5V) is at higher potential, ensuring RST remains valid down to 1V on either rail. The internal bandgap reference enables accurate threshold detection across –40°C to 85°C.

Each comparator (COMP3, COMP5, COMPA) asserts high when its respective input exceeds its precise threshold (VRT3 = 3.086V typ, VRT5 = 4.675V typ, VRTA = 1.000V typ), with no hysteresis. The RST output is held low until all three supplies remain above their thresholds for 200ms, providing robust power-on reset timing and brownout recovery.

Key Specifications

Pinout & Package

Package: 8-lead plastic MSOP (MS8), 3.00mm × 3.00mm body, 0.65mm pitch, 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 LTC1326-5 and LTC1726-5, the LTC1727EMS8-5#TRPBF offers unique per-rail comparator visibility and glitch-immune 200ms reset timing at lowest quiescent current, making it optimal for diagnostic-rich, ultra-low-power embedded systems where supply fault isolation is essential.

Availability

LTC1727EMS8-5#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC1727EMS8-5#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 LTC1727EMS8-5#TRPBF belongs to Analog Devices' precision power monitoring product line, engineered for reliable multi-rail supervision in space-constrained, low-power computing and instrumentation systems.

FAQ

What is the function of the VCCA pin on the LTC1727EMS8-5#TRPBF?

The VCCA pin on the LTC1727EMS8-5#TRPBF is a high-impedance adjustable supply sense input with a nominal 1.000V threshold. It monitors DC/DC converter feedback nodes or custom voltage rails. When unused, it may be tied to VCC3 or VCC5. Its comparator output (COMPA) asserts high only when VCCA exceeds its threshold and both VCC3 and VCC5 are ≥2.0V to enable the internal bandgap reference.

Does the LTC1727EMS8-5#TRPBF support monitoring only two supplies instead of three?

Yes, the LTC1727EMS8-5#TRPBF can be configured to monitor one or two supplies. For dual-supply operation, tie VCCA to VCC3 or VCC5 to disable its monitoring function while retaining VCC5 and VCC3 supervision. The device's architecture allows flexible configuration without external components, maintaining full accuracy and reset timing integrity.

What is the minimum supply voltage required to guarantee correct RST output behavior for the LTC1727EMS8-5#TRPBF?

The LTC1727EMS8-5#TRPBF guarantees correct RST output state for VCC3 or VCC5 ≥ 1V. Below this, RST is not guaranteed to hold valid logic levels. This 1V minimum ensures robust reset assertion during deep brownout conditions on either primary supply rail, a key reliability feature for mission-critical systems.

How does the VCC5 override function work in the LTC1727EMS8-5#TRPBF?

The VCC5 override function in the LTC1727EMS8-5#TRPBF disables the VCC5 comparator when VCC5 is within ±25mV of VCC3 and <4.15V, causing the device to behave as a 3.3V-only monitor. Above ~4.15V, the 5V trip point re-enables. This allows single-supply monitoring of a rising 5V rail that passes through the 3.1V–4.15V range during power-up.

Can the LTC1727EMS8-5#TRPBF drive a 5V logic interface directly?

Yes, the LTC1727EMS8-5#TRPBF's RST and comparator outputs are open-drain with weak internal 6µA pull-ups to VCC3, but they support external pull-up resistors to 5V. This allows direct interfacing with 5V logic families while maintaining valid VOH and VOL specifications under sink/source conditions specified in the datasheet.