Analog Devices Inc. LTC2914CGN-2#PBF

Overview

LTC2914CGN-2#PBF from Analog Devices (formerly Linear Technology) is a quad-input undervoltage/overvoltage supervisor IC designed for simultaneous monitoring of four independent power rails in space-constrained systems. It features ±1.5% threshold accuracy over temperature, 62µA quiescent current, adjustable reset timeout via external capacitor, and dual-polarity support (positive/negative voltage monitoring) using a buffered 1V reference. It is used in desktop/notebook computers and network servers for core and I/O rail supervision.

For engineers reviewing the LTC2914CGN-2#PBF datasheet, LTC2914CGN-2#PBF pinout, LTC2914CGN-2#PBF application, or LTC2914CGN-2#PBF equivalent, key selection considerations include its -2 variant's DIS pin functionality for output disable, guaranteed UV/OV assertion at VCC ≥ 1V, open-drain UV/OV outputs with weak internal pull-ups, and compatibility with 16-lead SSOP packaging for legacy board layouts.

Technical Context

The LTC2914CGN-2#PBF implements four independent comparator pairs (VHn/VLn), each configurable for positive or negative supply monitoring via the three-state SEL pin. Thresholds are referenced to a precision 1V buffered reference, enabling accurate 0.5V trip points across all inputs with ±1.5% tolerance over 0°C to 70°C.

Its UV and OV outputs share common open-drain logic lines with adjustable timeout (via TMR pin capacitor) and full disable capability via the DIS pin - a defining feature of the -2 variant. Input glitch rejection is achieved through internal low-pass filtering on each comparator output, eliminating need for external hysteresis while maintaining stable reset assertion.

Key Specifications

Pinout & Package

Package: 16-lead plastic SSOP (GN), 0°C to 70°C operating temperature range, exposed pad not present (DFN variant has exposed pad; SSOP does not).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage supervisor applications.

Compared with MAX6805US29D3+T and TPS3307-33DGNR, the LTC2914CGN-2#PBF uniquely delivers quad-rail supervision, dual-polarity capability, ±1.5% accuracy, and output disable - making it the only option for complex, multi-voltage, mixed-polarity systems requiring design flexibility and precision.

Availability

LTC2914CGN-2#PBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial embedded control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for LTC2914CGN-2#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and computing markets.

The LTC2914 product line was developed specifically for high-accuracy, low-power, multi-rail voltage supervision in computing and server platforms - emphasizing precision thresholding, noise immunity, and compact integration.

FAQ

What is the key functional difference between LTC2914CGN-2#PBF and LTC2914CGN-1#PBF?

The LTC2914CGN-2#PBF includes a DIS (disable) pin that, when pulled high, forces both UV and OV outputs into a high-impedance state - effectively disabling all fault reporting. In contrast, the LTC2914CGN-1#PBF uses the same pin as LATCH for OV output latching. This makes the -2 variant ideal for systems requiring firmware-controlled reset suppression, while the -1 variant suits applications needing persistent OV fault indication after clearing.

Can LTC2914CGN-2#PBF monitor negative voltages, and how is it configured?

Yes, the LTC2914CGN-2#PBF can monitor up to two negative voltages using its buffered 1V REF output and three-state SEL pin. When SEL is grounded, V3 and V4 inputs are configured for negative monitoring: VH3/VH4 trigger OV when below 0.5V, and VL3/VL4 trigger UV when above 0.5V - enabling accurate supervision of rails like –5V or –12V with standard resistor dividers referenced to REF.

What is the minimum VCC voltage required for LTC2914CGN-2#PBF to assert valid UV/OV outputs?

The LTC2914CGN-2#PBF guarantees UV assertion low and OV weak pull-up to VCC for VCC ≥ 1V. At VCC = 1V, UV output VOL is specified ≤0.15V with 100µA sink current, ensuring reliable reset signaling even during deep brown-out conditions - a critical feature for robust power sequencing in computing platforms.

How does the TMR pin function in LTC2914CGN-2#PBF, and what capacitor value yields a 200ms timeout?

The TMR pin sets the UV/OV timeout period via an external capacitor to GND, with timing approximately 9ms per nanofarad. For a 200ms timeout, CTMR ≈ 200ms / 9ms/nF ≈ 22.2nF - a standard 22nF capacitor achieves this. The TMR pin must have ≥10pF capacitance or be tied to VCC to bypass the timeout entirely.

Is the REF pin on LTC2914CGN-2#PBF intended for external use, and what are its drive limits?

Yes, the REF pin on LTC2914CGN-2#PBF is a buffered 1V output explicitly designed for external use - primarily to establish the 0.5V threshold offset for negative-rail monitoring circuits. It sources and sinks up to ±1mA, supports capacitive loads ≤1nF, and exhibits ±0.015V accuracy over 0°C to 70°C - enabling precise, stable biasing of external resistor networks without additional regulation.