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Analog Devices Inc. LTC2963HUDC-1#PBF
- Part No.:
- LTC2963HUDC-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC2963HUDC-1#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
LTC2963HUDC-1#PBF from Analog Devices is a quad configurable power supply supervisor IC with watchdog timer, designed for high-reliability monitoring of four independent voltage rails in industrial and automotive systems. It delivers ±0.5% threshold accuracy over –40°C to +125°C, supports selectable –4% and –6% reset thresholds for 1V–5V supplies, and features adjustable reset timeout (12–240 ms) and non-windowed watchdog with initial timeout scaling (1×/8×/64×). It is used in telecom server power sequencing where deterministic brownout response and fail-safe watchdog supervision are critical.
For engineers reviewing the LTC2963HUDC-1#PBF datasheet, LTC2963HUDC-1#PBF pinout, LTC2963HUDC-1#PBF application, or LTC2963HUDC-1#PBF equivalent, key selection considerations include H-grade temperature support, integrated watchdog status output (WDO), RST push-pull/open-drain configurability via DVCC, and precise ±ADJ mode for negative/overvoltage monitoring - all validated for automotive control and network infrastructure designs.
Technical Context
The LTC2963HUDC-1#PBF implements a 4-channel analog comparator bank with per-channel programmable thresholds selected via 4-bit ADC sampling of PG1–PG4 inputs referenced to a 1.195 V buffered bandgap. Each channel supports 16 preset UV/OV/±ADJ modes, with ±0.5% accuracy maintained across temperature by trimming and on-chip reference regulation.
Its watchdog logic operates independently of reset timing: WDI accepts rising/falling edges to clear a capacitor-based timer (CWT), while WDS selects initial timeout scaling (1×/8×/64×) after reset events. RST and WDO outputs are configurable as open-drain (DVCC = GND) or push-pull (DVCC ≥ 1.6 V), with guaranteed low-state operation down to VCC = 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.25 V to 5.5 V - powers core logic and enables operation across standard logic rails including 2.5 V, 3.3 V, and 5 V systems. |
| Threshold Accuracy | ±0.5% over –40°C to +125°C - ensures reliable undervoltage detection without false resets under thermal stress in automotive ECUs. |
| Reset Timeout | 12 ms to 240 ms (via CRT capacitor) or fixed 200 ms (RT tied to VCC) - provides precise power-up delay control for FPGA or microcontroller initialization sequences. |
| Watchdog Upper Timeout | 100 ms/nF (CWT) or fixed 1.6 s (WT tied to VCC) - enables flexible system-level fault recovery timing for real-time embedded firmware. |
| RST Output Type | Configurable push-pull (DVCC ≥ 1.6 V) or open-drain (DVCC = GND) - allows direct interfacing with 1.8 V/3.3 V logic or legacy 5 V reset buses without level shifters. |
| Supply Monitor Inputs | V1–V4 support 1 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V, or ±ADJ modes - enables simultaneous monitoring of mixed-voltage SoC domains (e.g., core, I/O, analog, DDR). |
| Initial Watchdog Timeout | Selectable via WDS: nominal tWDU, 8×tWDU, or 64×tWDU - accommodates extended boot time for complex processors before watchdog pulse requirements begin. |
Pinout & Package
20-lead 3 mm × 4 mm plastic QFN (UDC package) with exposed pad (Pin 21, optional GND connection). Thermal resistance θJA = 52°C/W, θJC = 6.8°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDIS | Reset Disable Input | Pulling low forces RST high during voltage margining tests - avoids unintended processor reset while validating supply tolerance limits. |
| MR | Manual Reset Input | Active-low input with internal 10 µA pull-up - accepts pushbutton or logic signal to trigger immediate system reset independent of monitored voltages. |
| DVCC | Digital Logic Supply | Sets RST/WDO output swing: ≥1.6 V enables push-pull drive to DVCC; GND configures open-drain with internal 6 µA pull-up to VCC. |
| VCC | Analog Core Supply | Primary power input (2.25–5.5 V); powers comparators, reference, and timing circuits - requires 0.1 µF bypass capacitor to GND. |
| RST | Reset Output | Guaranteed low-state down to VCC = 1 V; held low during power-up/brownout and released only after all V1–V4 exceed thresholds + tRST delay. |
| GND | Device Ground | Reference node for all analog and digital circuitry; exposed pad (Pin 21) may be connected to PCB ground for improved thermal performance. |
| REF | Buffered Reference Output | 1.195 V ±12 mV (–40°C to +125°C); drives external resistor dividers for PG1–PG4 programming - stable up to 1000 pF load capacitance. |
| PG1–PG4 | Threshold Select Inputs | Accept ratiometric voltage (0–VREF) to select one of 16 per-channel monitor modes - enables use of 1% resistors while maintaining ±0.5% threshold accuracy. |
| V1–V4 | Monitor Voltage Inputs | High-impedance inputs (±15 nA leakage in ±ADJ mode, 1.2 MΩ in fixed-threshold modes) - tolerate DC bias and transient noise without false triggering. |
| RT | Reset Timeout Capacitor Input | Connects to CRT to set tRST = 12 ms/nF; tie to VCC for fixed 200 ms timeout - eliminates need for external timing ICs in compact power management designs. |
| WDI | Watchdog Input | Edge-triggered (rising/falling) input that clears watchdog timer - must toggle at least once per tWDU to prevent WDO/RST assertion. |
| WDO | Watchdog Output | Open-drain status flag indicating watchdog expiration - latched low until valid WDI edge or undervoltage event occurs. |
| WDS | Initial Watchdog Timeout Select | Three-state input (low/open/high) setting post-reset timeout to 1×/8×/64× tWDU - prevents premature watchdog timeout during processor boot. |
| WT | Watchdog Timeout Capacitor Input | Connects to CWT to set tWDU = 100 ms/nF; tie to VCC for 1.6 s fixed timeout; tie to GND to disable watchdog - full hardware configurability. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% Threshold Accuracy Over Temperature | Reduces required system voltage margin by 1% vs ±1% supervisors - enables smaller bulk capacitors and lower nominal supply voltages in space-constrained designs. |
| Non-Windowed Watchdog with Initial Timeout Scaling | Eliminates need for external watchdog ICs while accommodating variable boot times - WDS pin allows safe startup window extension without firmware modification. |
| Configurable RST/WDO Output Drive | DVCC pin selects between push-pull (for fast rise/fall, rail-to-rail logic compatibility) and open-drain (for wired-OR reset buses or level translation) - no external components needed. |
| ±ADJ Mode for Negative/Overvoltage Monitoring | 0.5 V reference enables monitoring of negative rails (e.g., –12 V via resistive divider) or positive overvoltage (e.g., 5 V rail exceeding 5.25 V) using same IC - reduces BOM count. |
| H-Grade Operating Range (–40°C to +125°C) | Validated for under-hood automotive and industrial control environments - eliminates derating or external thermal management in harsh ambient conditions. |
Applications
| Automotive Engine Control Unit (ECU) | Telecom Server Power Sequencing |
|---|---|
Use Scenario: Monitoring 12 V battery, 5 V MCU supply, 3.3 V CAN transceiver, and 1.2 V DSP core in an engine ECU operating at 125°C under hood. IC Role / Device Role / Timing Role: Quad supervisor with H-grade rating ensures deterministic reset assertion during cold cranking (battery dip to 6 V) and hot soak (125°C ambient), while WDO flags firmware hangs. Use Value: ±0.5% accuracy prevents nuisance resets during marginal battery conditions; RDIS enables safe voltage margining of 1.2 V core without disrupting ECU operation. |
Use Scenario: Coordinating power-up sequence of CPU, memory, and peripheral rails in a 1 RU telecom server with strict timing windows and redundancy requirements. IC Role / Device Role / Timing Role: Simultaneous monitoring of 1.8 V, 3.3 V, 5 V, and 12 V rails with independent thresholds; RT capacitor sets precise 100 ms reset delay for FPGA configuration lock. Use Value: Adjustable tRST eliminates need for discrete RC timers; WDO provides dedicated watchdog status for BMC monitoring without consuming CPU GPIO. |
| Industrial PLC Backplane | Medical Imaging Power Management |
Use Scenario: Supervising isolated 24 V field bus, 5 V logic, 3.3 V communication, and ±15 V analog supply in a DIN-rail mounted PLC with wide ambient range. IC Role / Device Role / Timing Role: ±ADJ mode monitors –15 V rail via resistive divider; PG inputs configure identical –6% thresholds across all channels for consistent trip points. Use Value: Single IC replaces multiple discrete supervisors and negative voltage detectors - reduces footprint and improves long-term calibration stability. |
Use Scenario: Ensuring clean power-up of X-ray detector ASICs requiring tightly regulated 1.0 V, 1.5 V, 2.5 V, and 3.3 V supplies before image acquisition begins. IC Role / Device Role / Timing Role: Four independent UV monitors with –4% thresholds guarantee all rails stabilize above specification before enabling high-voltage generation circuitry. Use Value: Guaranteed RST low-state down to VCC = 1 V ensures reset assertion even during partial power loss - critical for patient safety interlocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361AUK+T | Triple supervisor (3 channels), no watchdog, ±1.5% threshold accuracy, SOT23-6 package | Lacks fourth channel and watchdog functionality; limited to simpler systems with ≤3 rails | Choose only if design requires minimal footprint and has no watchdog or quad-monitor requirement. |
| TPS3808G33DBVR | Single-channel supervisor, no watchdog, ±2% accuracy, adjustable threshold via resistor divider | Requires four separate ICs to match LTC2963HUDC-1#PBF's quad capability - increases board area and BOM cost | Use only for cost-sensitive, low-complexity applications where channel count and accuracy are secondary. |
Compared with MAX6361AUK+T and TPS3808G33DBVR, the LTC2963HUDC-1#PBF uniquely integrates four precision voltage monitors, non-windowed watchdog with scalable initial timeout, and H-grade operation in a single 3 mm × 4 mm QFN - eliminating design compromises between channel count, accuracy, and functional safety compliance.
Availability
LTC2963HUDC-1#PBF is available at Aetrix Electronics and suitable for automotive control systems, telecom server power sequencing, and industrial PLC backplane monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2963HUDC-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2963HUDC-1#PBF belongs to the LTC2962/LTC2963/LTC2964 family of configurable quad supervisors, engineered specifically for mission-critical power integrity monitoring in high-reliability systems where ±0.5% accuracy and integrated watchdog functionality are mandatory.
FAQ
What is the operating temperature range of the LTC2963HUDC-1#PBF?
The LTC2963HUDC-1#PBF is rated for –40°C to +125°C (H-grade), verified per manufacturer specifications and qualified for under-hood automotive and industrial control applications. This range is explicitly defined in the Absolute Maximum Ratings table and confirmed in the Order Information section of the datasheet, where "HUDC" denotes the H-temperature grade.
How does the LTC2963HUDC-1#PBF differ from the LTC2962 and LTC2964 variants?
The LTC2963HUDC-1#PBF includes a non-windowed watchdog timer with WDI, WDO, WDS, and WT pins - functionality absent in the LTC2962 (no watchdog) and distinct from the LTC2964 (which provides individual open-drain comparator outputs OUT1–OUT4 instead of RST/WDO). The UDC package (20-lead QFN) and H-grade rating are shared across LTC2963/LTC2964 but not LTC2962 (16-lead QFN).
Can the LTC2963HUDC-1#PBF monitor negative supply voltages?
Yes - the LTC2963HUDC-1#PBF supports –ADJ mode on any channel (V1–V4), comparing the input to a 0.5 V internal reference. When used with an external resistive divider, it accurately monitors negative rails (e.g., –5 V, –12 V) by scaling the negative voltage to a positive value within the 0–0.5 V range at the PG input, as detailed in the Applications Information section.
What is the minimum VCC voltage required for the LTC2963HUDC-1#PBF to assert a valid RST low state?
The LTC2963HUDC-1#PBF guarantees RST output low-state operation down to VCC = 1 V, as specified in the Electrical Characteristics table under "Guaranteed RST Output Low (VCC Rising)". This ensures reliable reset assertion during brownout conditions well below nominal supply levels.
How is the initial watchdog timeout configured on the LTC2963HUDC-1#PBF?
The initial watchdog timeout on the LTC2963HUDC-1#PBF is set via the WDS pin: logic low selects nominal tWDU, open circuit selects 8×tWDU, and logic high selects 64×tWDU. This three-state configuration is documented in the Electrical Characteristics table and Pin Functions section, enabling extended startup windows without firmware changes.
LTC2963HUDC-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open-Drain or Push-Pull
- Reset:
- Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC2963HUDC-1#PBF FAQ
1.How can I place an order for LTC2963HUDC-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2963HUDC-1#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2963HUDC-1#PBF reliable?
The price and inventory of LTC2963HUDC-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2963HUDC-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2963HUDC-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2963HUDC-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2963HUDC-1#PBF?
LTC2963HUDC-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2963HUDC-1#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2963HUDC-1#PBF?
For technical support, including LTC2963HUDC-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2963HUDC-1#PBF requirements.
6.How does Aetrix verify that LTC2963HUDC-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2963HUDC-1#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2963HUDC-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2963HUDC-1#PBF?
All LTC2963HUDC-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2963HUDC-1#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2963HUDC-1#PBF part is unused and in its original packaging.
Return procedure for LTC2963HUDC-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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