Analog Devices Inc. LTC1727ES8-5#TRPBF

Overview

LTC1727ES8-5#TRPBF from Analog Devices is a micropower precision triple supply monitor IC for systems requiring simultaneous monitoring of 5V, 3.3V, and an adjustable voltage rail. It features three independent 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 inputs ≥1V. It is used in notebook computers and intelligent instruments for reliable power-on reset sequencing.

For engineers reviewing the LTC1727ES8-5#TRPBF datasheet, LTC1727ES8-5#TRPBF pinout, LTC1727ES8-5#TRPBF application, or LTC1727ES8-5#TRPBF equivalent, this page provides verified technical context, package mapping, functional alternatives, and design-meaning specifications - all confirmed for the exact LTC1727ES8-5#TRPBF variant in 8-lead SO package with 5V/3.3V/ADJ thresholds.

Technical Context

The LTC1727ES8-5#TRPBF implements three independent comparators feeding into a 200ms reset timer and individual open-drain outputs. Its internal bandgap reference enables accurate trip points: VRT5 = 4.675V (±1.5%), VRT3 = 3.086V (±1.5%), and VRTA = 1.000V (±1.5%). Power is sourced dynamically from whichever supply (VCC5 or VCC3) is higher, ensuring RST remains valid down to 1V on either rail.

Glitch immunity is achieved via dual mechanisms: input hysteresis requiring ≥10% threshold overdrive for ≥50µs before state change, and a fixed 200ms reset pulse width that debounces transient undervoltage events. The COMPA output requires VCC3 or VCC5 ≥2V to activate its internal reference, while COMP5 and COMP3 are guaranteed functional at ≥1V.

Key Specifications

Pinout & Package

LTC1727ES8-5#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150-inch narrow body, with lead finish RoHS-compliant matte tin. Pin 1 is marked by a bevel edge or dimple; thermal resistance θ_JA = 150°C/W.

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 LTC1727ES8-5#TRPBF offers lower quiescent current (10µA vs 15µA) and simpler fixed-timing architecture ideal for cost-sensitive, static-power-critical designs where 200ms reset suffices and no watchdog is required.

Availability

LTC1727ES8-5#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 LTC1727ES8-5#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 product line delivers precision, low-power supply monitoring solutions for multi-rail systems, designed specifically to replace discrete resistor-divider + comparator circuits with guaranteed accuracy, glitch immunity, and minimal board space.

FAQ

What is the function of the VCCA pin on the LTC1727ES8-5#TRPBF?

The VCCA pin on the LTC1727ES8-5#TRPBF is a high-impedance input for monitoring an adjustable voltage rail, with a fixed threshold of 1.000V ±1.5%. It supports connection to DC/DC converter feedback dividers or custom low-voltage supplies. When unused, it may be tied to VCC3 or VCC5. The COMPA output reflects its status, but requires VCC3 or VCC5 ≥2V to activate the internal bandgap reference.

Does the LTC1727ES8-5#TRPBF support single-supply monitoring?

Yes, the LTC1727ES8-5#TRPBF supports single-supply monitoring via its override function. When VCC3 and VCC5 are tied together, the device automatically selects 3.3V monitoring below ~4.15V and switches to 5V monitoring above that level. This eliminates need for external logic or jumper configuration in systems with variable input rails.

What is the minimum operating voltage for the RST output to remain valid on the LTC1727ES8-5#TRPBF?

The RST output on the LTC1727ES8-5#TRPBF is guaranteed to be in the correct logic state for VCC3 or VCC5 ≥1V. Below 1V, RST behavior is undefined. This ensures robust reset assertion during deep brownout conditions common in battery-backed or unregulated power systems.

How does the LTC1727ES8-5#TRPBF achieve glitch immunity?

The LTC1727ES8-5#TRPBF achieves glitch immunity through two mechanisms: first, each input requires ≥10% threshold overdrive sustained for ≥50µs before triggering a state change; second, the 200ms reset pulse width acts as a hardware debounce filter. These features prevent false resets caused by switching noise, ESD transients, or supply ripple.

Can the LTC1727ES8-5#TRPBF be used in place of the LTC1728-5?

No - the LTC1727ES8-5#TRPBF cannot be used as a direct replacement for the LTC1728-5 because it includes three individual comparator outputs (COMP5, COMP3, COMPA) not present on the LTC1728-5, which has only RST. While both share identical reset timing and thresholds, the LTC1727ES8-5#TRPBF requires additional PCB routing and pull-up resistors for the extra outputs, making it incompatible in pin-constrained or functionally minimal designs.