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Analog Devices Inc. LTC2964IUDC#PBF
- Part No.:
- LTC2964IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC2964IUDC#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,452
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Product details
Overview
LTC2964IUDC#PBF from Analog Devices is a quad configurable power supply supervisor IC with individual open-drain comparator outputs (OUT1–OUT4), ±0.5% threshold accuracy over temperature, and support for 5V/3.3V/2.5V/1.8V/1.5V/1.2V/1.0V/±ADJ monitoring modes. It operates from 2.25V to 5.5V VCC, features adjustable reset timeout via external capacitor, and delivers reliable undervoltage, overvoltage, and negative voltage supervision in high-reliability embedded systems.
For engineers reviewing the LTC2964IUDC#PBF datasheet, LTC2964IUDC#PBF pinout, LTC2964IUDC#PBF application, or LTC2964IUDC#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts - all grounded in the official LTC2962/LTC2963/LTC2964 Rev 0 datasheet and Analog Devices' published specifications.
Technical Context
The LTC2964IUDC#PBF implements four independent voltage comparators with programmable thresholds selected via 16-mode PG inputs using external 1% resistors. Each channel supports ±ADJ mode (0.5V reference) for flexible undervoltage/overvoltage/negative-voltage detection, and threshold accuracy is guaranteed at ±0.5% over –40°C to +85°C.
Unlike LTC2962 (single RST) or LTC2963 (RST + watchdog), the LTC2964IUDC#PBF omits watchdog circuitry and instead provides four dedicated open-drain outputs (OUT1–OUT4), each reflecting real-time comparator state without reset timeout delay - enabling direct power-good signaling or sequencing control in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.25V to 5.5V - powers entire IC; ensures operation across standard logic rails including 3.3V and 5V systems. |
| Threshold Accuracy | ±0.5% over –40°C to +85°C - guarantees tight margining for critical supplies like FPGA core voltages without false resets. |
| Monitor Inputs | V1–V4 with ±ADJ capability - enables simultaneous supervision of up to four rails, including positive, negative, or adjustable thresholds. |
| Output Type | Four open-drain OUT1–OUT4 pins - each directly reflects comparator state; no internal timing delay, ideal for power-good status or sequencer triggers. |
| Reset Timeout | Configurable via RT capacitor (12ms/nF) or fixed 200ms - allows precise control of system hold time after all rails stabilize. |
| Reference Voltage | 1.195V ±12mV (±1%) - stable buffered REF output used for accurate resistor-divider programming of PG inputs. |
| Input Bias Current | ±15nA in ±ADJ mode - enables high-impedance monitoring without loading sensitive feedback nodes. |
Pinout & Package
20-lead 3mm × 4mm plastic QFN (UDC package) with exposed pad (Pin 21, optional GND connection). Pin count, layout, and thermal metrics (θJA = 52°C/W, θJC = 6.8°C/W) are identical across LTC2963/LTC2964 UDC variants per datasheet mechanical drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDIS | Reset Disable Input | Logic-low disables RST assertion during voltage margining tests; internal 10µA pull-up enables open-circuit default operation. |
| MR | Manual Reset Input | Active-low input with internal pull-up and debounce; forces immediate RST low for controlled system reset. |
| DVCC | Digital Logic Supply | When tied >1.6V, configures RST as push-pull; when grounded, RST is open-drain pulled to VCC by 6µA. |
| VCC | Main Power Supply | Primary supply rail (2.25–5.5V); powers all circuitry and internally pulls up RST/OUT1–OUT4 via 6µA current sources. |
| RST | Reset Output | Open-drain output asserted low if any Vn falls below threshold; held low for configured timeout after recovery. |
| GND | Device Ground | Reference node for all analog and digital circuitry; exposed pad (Pin 21) may be connected to PCB ground for thermal relief. |
| REF | Buffered Reference | 1.195V ±12mV output; drives PG resistor dividers with ≤1000pF load; ±1mA sourcing/sinking capability. |
| PG1–PG4 | Threshold Select Inputs | Accept voltage-divided REF to select one of 16 thresholds per channel; no external capacitance allowed. |
| V1–V4 | Monitor Inputs | High-impedance inputs (±15nA bias in ±ADJ mode); accept 0.5V reference for adjustable monitoring or preset rails. |
| OUT1–OUT4 | Individual Comparator Outputs | Real-time open-drain outputs - each pulls low when its Vn is below threshold (or above in –ADJ mode); no timeout delay. |
| RT | Reset Timeout Capacitor | Connect CRT to GND for adjustable timeout (12ms/nF); tie to VCC for fixed 200ms timeout. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% threshold accuracy over temperature | Enables tighter system voltage margins, reduces need for oversized bulk capacitors, and supports lower nominal supply voltages to cut power consumption. |
| Four independent open-drain outputs (OUT1–OUT4) | Allows per-rail power-good signaling without shared reset delay - essential for FPGA/CPU power sequencing and fault-isolation diagnostics. |
| Programmable thresholds via 1% resistors | Eliminates need for precision trimming or custom ASICs; 16 selectable modes per channel enable reuse across diverse supply combinations. |
| ±ADJ mode with 0.5V reference | Supports overvoltage monitoring of positive rails or undervoltage monitoring of negative rails using simple external dividers - no extra components required. |
| Reset disable (RDIS) and manual reset (MR) | Enables safe in-system voltage margining and field-serviceable reset initiation without hardware modification or firmware intervention. |
Applications
| Telecom Power Sequencing | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Coordinating startup order of 12V, 5V, 3.3V, and 1.8V rails powering FPGAs, transceivers, and memory in base station line cards. IC Role / Device Role / Timing Role: LTC2964IUDC#PBF monitors each rail independently and asserts OUT1–OUT4 as discrete power-good signals to enable downstream regulators or logic gates in sequence. Use Value: Eliminates need for external timing RC networks or microcontroller-based sequencing, reducing BOM count and improving startup repeatability across temperature. |
Use Scenario: Supervising dual-core SoC supplies (1.1V CPU, 0.85V GPU, 3.3V I/O, 5V camera interface) in autonomous driving ECUs operating from –40°C to +85°C. IC Role / Device Role / Timing Role: LTC2964IUDC#PBF applies ±0.5% accurate thresholds to detect brownout on safety-critical rails and reports faults via isolated OUTx lines to ASIL-B-compliant monitoring logic. Use Value: Meets ISO 26262 functional safety requirements for voltage supervision without software dependency or calibration drift over lifetime. |
| Industrial PLC Backplane | Network Switch ASIC Power Management |
Use Scenario: Monitoring redundant 24V, 12V, 5V, and 3.3V DC-DC outputs feeding I/O modules, communication ports, and real-time controllers in factory automation systems. IC Role / Device Role / Timing Role: LTC2964IUDC#PBF uses RDIS to temporarily suppress RST during hot-swap insertion while OUT1–OUT4 feed status LEDs and diagnostic registers. Use Value: Enables zero-downtime module replacement and avoids spurious controller resets during maintenance windows. |
Use Scenario: Ensuring clean power-up of 0.8V SerDes, 1.2V core, 1.8V memory, and 3.3V management MCU in 10G/25G Ethernet switches. IC Role / Device Role / Timing Role: LTC2964IUDC#PBF configures PG inputs for –4% thresholds on all rails and feeds OUTx signals to switch fabric logic to gate clock distribution until all supplies stabilize. Use Value: Prevents metastability and bit errors during boot by enforcing strict rail-ordering compliance before link training begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6812HEUT+T | Single-supply quad monitor with fixed 3.08V/3.3V/3.6V/4.63V thresholds; no programmability, no ±ADJ mode, no individual outputs. | Limited to fixed-rail systems; cannot supervise 1.8V/1.5V/±ADJ rails or support custom sequencing logic. | Select only when all monitored voltages match MAX6812's factory-set thresholds and no per-rail status reporting is needed. |
| TPS3808G33DBVR | Single-channel supervisor with adjustable threshold (0.4V–5.8V) and 200ms fixed timeout; requires four devices for quad monitoring. | Higher component count, larger PCB area, and no synchronized configuration - thresholds and timeouts must be set individually per device. | Choose only when board space permits discrete supervision and cost sensitivity outweighs integration benefits of LTC2964IUDC#PBF. |
Compared with MAX6812HEUT+T and TPS3808G33DBVR, the LTC2964IUDC#PBF delivers superior flexibility through programmable thresholds, ±ADJ capability, and four real-time outputs - reducing system-level complexity, minimizing footprint, and enabling deterministic power sequencing unattainable with fixed or single-channel alternatives.
Availability
LTC2964IUDC#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS domain controllers, and industrial PLC backplanes requiring stable component supply, extended temperature operation (–40°C to +85°C), and ±0.5% voltage monitoring accuracy.
Supply support for LTC2964IUDC#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2964IUDC#PBF belongs to the LTC2962 family of configurable quad supervisors, designed specifically for high-reliability systems demanding precision voltage monitoring, flexible rail combinations, and deterministic power sequencing without microcontroller involvement.
FAQ
What is the operating temperature range for the LTC2964IUDC#PBF?
The LTC2964IUDC#PBF is rated for operation from –40°C to +85°C (I-grade), as confirmed in the "ORDER INFORMATION" table of the official datasheet. This range is validated across all electrical characteristics including ±0.5% threshold accuracy, VCC supply current, and propagation delays - making it suitable for automotive under-hood and industrial edge environments.
Does the LTC2964IUDC#PBF include watchdog functionality?
No, the LTC2964IUDC#PBF does not include watchdog circuitry. Per the datasheet's "APPLICATIONS" section and block diagram, watchdog features (WDI, WDO, WDS, WT) are exclusive to the LTC2963 variant. The LTC2964IUDC#PBF is differentiated by its four individual open-drain comparator outputs (OUT1–OUT4) and absence of watchdog-related pins or timing logic.
How is reset timeout configured on the LTC2964IUDC#PBF?
Reset timeout on the LTC2964IUDC#PBF is configured via the RT pin: connecting an external capacitor CRT to GND sets timeout to 12ms per nanofarad (e.g., 1500pF yields ~18ms), while tying RT to VCC activates the internal 200ms timeout. This is explicitly defined in the "ELECTRICAL CHARACTERISTICS" table (tRST parameter) and "PIN FUNCTIONS" section of the datasheet.
Can the LTC2964IUDC#PBF monitor negative voltages?
Yes - the LTC2964IUDC#PBF supports negative voltage monitoring using the –ADJ mode. As stated in the "FEATURES" and "PIN FUNCTIONS" sections, the –ADJ mode compares Vn to a 0.5V reference, enabling undervoltage detection on negative rails when paired with an appropriate external resistive divider that translates the negative input into a positive voltage at the comparator input.
What is the function of the DVCC pin on the LTC2964IUDC#PBF?
The DVCC pin on the LTC2964IUDC#PBF sets the logic swing of the RST output: when DVCC is grounded, RST operates as an open-drain output weakly pulled to VCC; when DVCC is connected to a voltage >1.6V (e.g., 3.3V), RST becomes an active push-pull output referenced to DVCC. This behavior is documented in the "PIN FUNCTIONS" section and confirmed in Note 3 of the Electrical Characteristics table.
LTC2964IUDC#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC2964IUDC#PBF FAQ
1.How can I place an order for LTC2964IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2964IUDC#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 LTC2964IUDC#PBF reliable?
The price and inventory of LTC2964IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2964IUDC#PBF is usually 5 days.
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LTC2964IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2964IUDC#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 LTC2964IUDC#PBF?
For technical support, including LTC2964IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2964IUDC#PBF requirements.
6.How does Aetrix verify that LTC2964IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2964IUDC#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 LTC2964IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC2964IUDC#PBF?
All LTC2964IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2964IUDC#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 LTC2964IUDC#PBF part is unused and in its original packaging.
Return procedure for LTC2964IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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