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Analog Devices Inc. LTC2963IUDC-1#TRPBF
- Part No.:
- LTC2963IUDC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC2963IUDC-1#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,447
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Product details
Overview
LTC2963IUDC-1#TRPBF 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, 1.8V, ±ADJ) and delivers push-pull or open-drain RST/WDO outputs for high-reliability server and automotive control systems.
For engineers reviewing the LTC2963IUDC-1#TRPBF datasheet, LTC2963IUDC-1#TRPBF pinout, LTC2963IUDC-1#TRPBF application, or LTC2963IUDC-1#TRPBF equivalent, key selection criteria include guaranteed RST low down to VCC = 1V, ±ADJ mode for negative/overvoltage monitoring, WDS-selectable initial watchdog timeout, and I-grade (–40°C to +85°C) operation in compact UDC packaging.
Technical Context
The LTC2963IUDC-1#TRPBF implements a 4-channel voltage monitor with per-channel programmable thresholds selected via 16-mode PG inputs using external 1% resistors. Each channel supports UV/OV/±ADJ modes with comparator propagation delay ≤40 µs and glitch immunity ensuring false-trigger-free reset assertion.
Its watchdog subsystem features adjustable upper timeout (100 ms/nF on WT pin), three-state WDS input for initial timeout scaling (1×/8×/64×), and WDI edge-sensitive clearing (rising/falling). RST and WDO outputs are configurable as push-pull (DVCC ≥1.6V) or open-drain (DVCC = GND), with VOL ≤150 mV at 3 mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.25V to 5.5V - powers internal circuitry and enables RST pull-up; guarantees correct RST state down to 1V during brownout. |
| Threshold Accuracy | ±0.5% over –40°C to +85°C - ensures reliable margining without false resets; e.g., 3.3V –4% threshold = 3.152V to 3.185V. |
| Reset Timeout | 12–240 ms (CRT = 1–20 nF) or fixed 200 ms (RT tied to VCC) - sets minimum system hold time after all supplies stabilize. |
| Watchdog Upper Timeout | 100 ms/nF on WT pin, or fixed 1.6 s (WT tied to VCC) - defines maximum allowed WDI interval before WDO/RST assert. |
| WDS Selectable Initial Timeout | 1×, 8×, or 64× upper timeout - provides extended startup window for firmware initialization before watchdog enforcement begins. |
| RST Output Type | Configurable push-pull (DVCC ≥1.6V) or open-drain (DVCC = GND) - supports direct interfacing to 1.8V/3.3V/5V logic domains. |
| Supply Monitor Inputs | V1–V4 accept 5V/3.3V/2.5V/1.8V/1.5V/1.2V/1.0V or ±ADJ (0.5V reference) - enables simultaneous monitoring of mixed-rail systems. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC) with exposed pad (Pin 21), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDIS | Reset Disable Input | Pulling low forces RST high - enables safe voltage margining without triggering system reset. |
| MR | Manual Reset Input | Logic-low pulse pulls RST low immediately; internal 10µA pull-up allows switch interface without external resistor. |
| DVCC | Digital Logic Supply | Sets RST/WDO output swing: ≥1.6V → push-pull to DVCC; GND → open-drain to VCC. |
| VCC | Analog Power Supply | Primary supply (2.25–5.5V); powers internal bandgap, comparators, and RST pull-up (6µA). |
| RST | Reset Output | Active-low output asserted when any Vn falls below threshold; held low for tRST after recovery. |
| GND | Device Ground | Reference for all analog/digital signals; exposed pad (Pin 21) is internally grounded and PCB connection is optional. |
| REF | Buffered Reference | 1.195V ±12mV output; drives PG resistor dividers and supports ±ADJ mode level shifting. |
| PG1–PG4 | Threshold Select Inputs | Accept ratiometric voltage (0–VREF) to select one of 16 thresholds per channel using 1% resistors. |
| V1–V4 | Monitor Inputs | High-impedance inputs (±15nA in ±ADJ mode, ~1.2MΩ otherwise) for direct connection to supply rails. |
| RT | Reset Timeout Capacitor | Capacitor to GND sets tRST = 12ms/nF; tie to VCC for fixed 200ms timeout. |
| WDI | Watchdog Input | Edge-sensitive (rising/falling) input - toggling within tWDU prevents WDO/RST assertion. |
| WDO | Watchdog Output | Open-drain status flag; latched low on timeout until cleared by valid WDI edge or undervoltage event. |
| WDS | Initial Watchdog Select | Three-state input (low/open/high) selects 1×/8×/64× tWDU for first timeout after reset. |
| WT | Watchdog Timeout Capacitor | Capacitor to GND sets tWDU = 100ms/nF; tie to VCC for fixed 1.6s, tie to GND to disable watchdog. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% threshold accuracy over full temperature range | Reduces required system voltage margin by 1% vs ±1% supervisors - relaxes PSU tolerance and enables smaller filter components. |
| Configurable non-windowed watchdog with selectable initial timeout | WDS pin allows 1×/8×/64× scaling of first watchdog period - accommodates slow-boot firmware without disabling supervision. |
| Per-channel ±ADJ mode (0.5V reference) | Supports overvoltage monitoring of positive rails or undervoltage monitoring of negative supplies - eliminates need for external level-shifting circuitry. |
| Guaranteed RST low down to VCC = 1V | Ensures robust power-on reset assertion even during severe brownout - critical for deterministic system initialization. |
| Push-pull or open-drain RST/WDO outputs | DVCC pin configures output drive strength and logic domain - simplifies interface to mixed-voltage SoCs and FPGAs. |
| 16 preset thresholds per channel (5V to 1.0V + ±ADJ) | Enables identical or independent monitoring of multiple rails using only 1% resistors - reduces BOM count and layout complexity. |
Applications
| Server Power Sequencing | Automotive ADAS ECU Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of 12V, 5V, 3.3V, and 1.8V rails in a dual-CPU server motherboard during cold start and dynamic load transients. IC Role / Device Role / Timing Role: Quad supervisor asserts RST if any rail drops below –4% threshold; watchdog verifies firmware execution post-reset. Use Value: ±0.5% accuracy prevents nuisance resets during nominal PSU ripple; WDS-extended initial timeout accommodates BIOS POST timing. |
Use Scenario: Real-time supervision of safety-critical 5V sensor supply, 3.3V MCU core, 1.2V GPU, and –5V analog bias in autonomous driving controller. IC Role / Device Role / Timing Role: LTC2963IUDC-1#TRPBF monitors all rails with –ADJ mode on negative bias; WDO triggers fail-safe shutdown on missed WDI pulses. Use Value: Guaranteed RST low at VCC = 1V ensures reset during battery sag; I-grade temp range supports under-hood operation. |
| Industrial PLC Power Management | Telecom Line Card Voltage Integrity |
Use Scenario: Monitoring redundant 24V DC input, isolated 5V logic, 3.3V FPGA, and 1.8V DDR supply in modular programmable logic controller. IC Role / Device Role / Timing Role: RDIS pin disables reset during controlled voltage margining tests; MR input enables manual board-level reset. Use Value: Adjustable tRST (via CRT) aligns with PLC boot sequence timing; REF output sources precision divider networks. |
Use Scenario: Supervising 48V PoE input, 12V intermediate, 3.3V SerDes, and 1.0V ASIC core in carrier-grade optical line card. IC Role / Device Role / Timing Role: LTC2963IUDC-1#TRPBF detects undervoltage on 48V input and initiates graceful shutdown; WDO flags software hang. Use Value: 20-lead QFN footprint minimizes PCB area; ±ADJ mode monitors PoE return path integrity without extra components. |
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 (not quad); no watchdog; fixed 2.5V/3.3V/5V thresholds only; SOT23-6 package | Lacks channel count, adjustability, and watchdog - suitable only for simple triple-rail systems without supervision timing control | Select only if system requires <3 monitored rails and no watchdog functionality; not drop-in compatible |
| TPS3808G33DBVR | Single-channel supervisor; 3.3V fixed threshold; no watchdog; 6-pin SOT23; 0.5% accuracy only at 25°C (not over temp) | No multi-rail capability or temperature-stable accuracy - cannot replace quad monitoring or watchdog functions of LTC2963IUDC-1#TRPBF | Use only for single-rail backup where extended temperature accuracy is non-critical; requires 4x units and external logic for quad function |
Compared with MAX6361AUK+T and TPS3808G33DBVR, the LTC2963IUDC-1#TRPBF uniquely delivers four independently configurable channels, ±0.5% accuracy across –40°C to +85°C, and a scalable watchdog - eliminating design compromises in high-integrity embedded systems.
Availability
LTC2963IUDC-1#TRPBF is available at Aetrix Electronics and suitable for network infrastructure, automotive control systems, and industrial PLCs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2963IUDC-1#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 precision instrumentation, communications, and industrial markets.
The LTC2963IUDC-1#TRPBF belongs to the LTC2962/LTC2963/LTC2964 family of configurable quad supervisors - designed specifically for high-reliability systems demanding precise, multi-rail power monitoring with integrated watchdog assurance.
FAQ
What is the operating temperature range for the LTC2963IUDC-1#TRPBF?
The LTC2963IUDC-1#TRPBF is rated for industrial temperature operation from –40°C to +85°C (I-grade). This range is validated across all electrical specifications including ±0.5% threshold accuracy, reset timeout stability, and watchdog timing consistency - making it suitable for under-hood automotive and industrial environments where thermal stress is significant.
How does the WDS pin affect watchdog behavior in the LTC2963IUDC-1#TRPBF?
The WDS pin on the LTC2963IUDC-1#TRPBF selects the initial watchdog timeout duration immediately after any reset event: logic low = nominal tWDU, open = 8×tWDU, logic high = 64×tWDU. This allows firmware additional time to initialize peripherals before the first watchdog window begins - a feature absent in standard supervisors and critical for complex boot sequences.
Can the LTC2963IUDC-1#TRPBF monitor negative supply voltages?
Yes - the LTC2963IUDC-1#TRPBF supports –ADJ mode on any channel (V1–V4) using the internal 0.5V reference. When configured with an external resistor divider, –ADJ enables precise undervoltage monitoring of negative rails (e.g., –5V, –12V) or overvoltage monitoring of positive supplies, eliminating need for external op-amps or level shifters.
What is the minimum VCC voltage required for reliable RST assertion in the LTC2963IUDC-1#TRPBF?
The LTC2963IUDC-1#TRPBF guarantees correct RST output state (low) for VCC down to 1V. This ensures deterministic power-on reset assertion during brownout conditions - a key reliability feature verified across temperature and process corners, unlike many competitors that specify functional operation only above 2.0V.
Is the LTC2963IUDC-1#TRPBF pin-compatible with other members of the LTC2962/LTC2963/LTC2964 family?
The LTC2963IUDC-1#TRPBF uses the 20-lead UDC package and shares identical pinout with LTC2963 and LTC2964 variants (e.g., LTC2963CUDC-1#TRPBF, LTC2964IUDC#TRPBF). However, it is not pin-compatible with the 16-lead LTC2962 series (UD package), and functional differences (e.g., absence of OUT1–OUT4 in LTC2963) require schematic review before substitution.
LTC2963IUDC-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC2963IUDC-1#TRPBF FAQ
1.How can I place an order for LTC2963IUDC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2963IUDC-1#TRPBF 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 LTC2963IUDC-1#TRPBF reliable?
The price and inventory of LTC2963IUDC-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2963IUDC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2963IUDC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2963IUDC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2963IUDC-1#TRPBF?
LTC2963IUDC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2963IUDC-1#TRPBF 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 LTC2963IUDC-1#TRPBF?
For technical support, including LTC2963IUDC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2963IUDC-1#TRPBF requirements.
6.How does Aetrix verify that LTC2963IUDC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2963IUDC-1#TRPBF 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 LTC2963IUDC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2963IUDC-1#TRPBF?
All LTC2963IUDC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2963IUDC-1#TRPBF, 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 LTC2963IUDC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2963IUDC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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