Analog Devices Inc. LTC2963CUDC-1#PBF

Overview

LTC2963CUDC-1#PBF from Analog Devices is a quad configurable power supply supervisor IC with integrated non-windowed watchdog timer, ±0.5% threshold accuracy over temperature, adjustable reset timeout (12–240 ms), and 20-lead 3mm × 4mm QFN package. It monitors up to four supply rails (e.g., 5V, 3.3V, 2.5V, 1.8V) and supports undervoltage, overvoltage, and negative voltage detection in telecom server power management systems.

For engineers reviewing the LTC2963CUDC-1#PBF datasheet, LTC2963CUDC-1#PBF pinout, LTC2963CUDC-1#PBF application, or LTC2963CUDC-1#PBF equivalent, key selection considerations include its C-grade (0°C to 70°C) operating range, watchdog status output (WDO), initial watchdog timeout select (WDS), and compatibility with external timing capacitors on RT and WT pins for precise reset and watchdog timing control.

Technical Context

The LTC2963CUDC-1#PBF implements a 4-channel analog comparator bank with 16 selectable per-channel thresholds via PG1–PG4 inputs referenced to a buffered 1.195V internal reference. Each channel supports ±ADJ mode (0.5V threshold) for flexible positive/negative rail monitoring.

Its watchdog function uses an internal timer driven by capacitor CWT on WT pin, with three initial timeout options (nominal, 8×, or 64× upper timeout) selected via WDS, and generates a latched WDO low pulse upon timeout-triggering RST assertion after one reset timeout period.

Key Specifications

Pinout & Package

Package: 20-lead 3mm × 4mm plastic QFN (UDC), exposed pad (pin 21) optional PCB ground connection. Thermal resistance θ_JA = 52°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and TPS3808G33DBVR, the LTC2963CUDC-1#PBF delivers full quad supervision, ±0.5% programmable thresholds, and integrated non-windowed watchdog in a single 20-pin QFN - eliminating board space, BOM count, and timing skew issues inherent in multi-device solutions.

Availability

LTC2963CUDC-1#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS domain controllers, and industrial PLC backplane power systems requiring stable component supply with C-grade temperature validation and long-term lifecycle support.

Supply support for LTC2963CUDC-1#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control applications.

The LTC2963CUDC-1#PBF belongs to the LTC2962/LTC2963/LTC2964 family of configurable quad supervisors, designed specifically for high-reliability power integrity monitoring in network equipment, servers, and automotive control systems where accuracy, flexibility, and watchdog reliability are critical.

FAQ

What is the operating temperature range for the LTC2963CUDC-1#PBF?

The LTC2963CUDC-1#PBF is rated for the C-grade temperature range of 0°C to 70°C. This specification is validated across all electrical parameters in the official Analog Devices datasheet and applies to both functional operation and parametric limits such as threshold accuracy and reset timeout stability. The device uses internal thermal compensation to maintain ±0.5% threshold accuracy across this full range.

How does the WDS pin affect watchdog behavior in the LTC2963CUDC-1#PBF?

The WDS pin on the LTC2963CUDC-1#PBF selects the initial watchdog timeout duration immediately following any reset event. A logic low sets it to the nominal upper timeout (e.g., 100 ms with CWT = 1 nF), an open state extends it to 8× that value, and a logic high extends it to 64×. This prevents premature watchdog timeouts during system boot when firmware may not yet be ready to generate WDI edges.

Can the LTC2963CUDC-1#PBF monitor negative supply voltages?

Yes, the LTC2963CUDC-1#PBF supports negative voltage monitoring via its –ADJ mode. When configured with –ADJ on a channel (e.g., V1), the internal comparator references the input to 0.5V instead of ground, enabling undervoltage detection on negative rails such as –5V or –12V using an external resistive divider - no level-shifting op-amp is required.

What is the minimum VCC voltage required for reliable RST output operation in the LTC2963CUDC-1#PBF?

The LTC2963CUDC-1#PBF guarantees correct RST output state down to VCC = 1V. Below this, the internal circuitry cannot maintain defined logic levels. At VCC ≥ 1V, RST remains asserted low during power-up until configuration completes and all monitored voltages exceed their thresholds, then releases after the programmed timeout period.

How is reset timeout adjusted on the LTC2963CUDC-1#PBF?

Reset timeout on the LTC2963CUDC-1#PBF is adjusted by connecting an external capacitor CRT between the RT pin and GND. The timeout follows a linear relationship of 12 ms per nanofarad (e.g., 150 pF yields ~1.8 ms). Alternatively, tying RT to VCC activates a fixed 200 ms internal timeout - no capacitor needed.