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Analog Devices Inc. LTC2964IUDC#TRPBF
- Part No.:
- LTC2964IUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC2964IUDC#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,377
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Product details
Overview
LTC2964IUDC#TRPBF from Analog Devices is a quad configurable voltage supervisor IC with individual open-drain comparator outputs (OUT1–OUT4), ±0.5% threshold accuracy over temperature, and support for 16 programmable thresholds per channel including ±ADJ modes. It monitors up to four supply rails (e.g., 5V, 3.3V, 2.5V, 1.8V) in high-reliability telecom and server power systems.
For engineers reviewing the LTC2964IUDC#TRPBF datasheet, LTC2964IUDC#TRPBF pinout, LTC2964IUDC#TRPBF application, or LTC2964IUDC#TRPBF equivalent, key selection criteria include its individual real-time comparator outputs (no reset timeout delay), –40°C to +85°C industrial temperature grade, 20-lead 3mm × 4mm QFN package, and compatibility with external 1% resistive programming for precise undervoltage/overvoltage/negative-voltage detection.
Technical Context
The LTC2964IUDC#TRPBF implements four independent rail-to-rail comparators with internal 1.195V buffered reference, each selectable among 16 thresholds via PG1–PG4 inputs. Its architecture supports both positive adjustable (+ADJ, 0.5V threshold) and negative adjustable (–ADJ, 0.5V threshold) monitoring modes, enabling overvoltage detection on positive rails and undervoltage detection on negative supplies.
Unlike the LTC2962/LTC2963 variants, the LTC2964IUDC#TRPBF omits watchdog functionality and integrated RST timeout logic - instead delivering immediate, asynchronous open-drain outputs (OUT1–OUT4) that reflect instantaneous comparator states. Each output features a weak 6µA internal pull-up to VCC and supports external pull-up to higher logic supplies for VIH compliance and faster rise times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.25V to 5.5V - powers all analog and digital circuitry; ensures operation across common logic supply domains. |
| Threshold Accuracy | ±0.5% over –40°C to +85°C - guarantees tight reset assertion windows without false triggering during thermal cycling. |
| OUTn Output Type | Open-drain with 6µA internal pull-up to VCC - enables level-shifting via external pull-up and avoids bus contention in multi-supply systems. |
| Comparator Propagation Delay | 20µs to 40µs (tUV) - provides fast fault response for critical power sequencing and safety-critical monitoring. |
| Vn Input Bias Current | ±15nA in ±ADJ mode; 0.8–1.6MΩ input resistance otherwise - minimizes loading on sensitive power rails and precision dividers. |
| Reference Voltage (VREF) | 1.195V ±12mV (1.183V–1.207V) - stable, buffered reference used for all threshold programming and level-shifting functions. |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for industrial and telecom infrastructure environments with extended thermal stress. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC) with exposed pad (Pin 21), rated for θJA = 52°C/W. PCB ground connection to exposed pad is optional but recommended for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDIS | Reset Disable Input | Logic-low assertion forces RST high - enables safe voltage margining without system reset; internal 10µA pull-up allows open-circuit default. |
| MR | Manual Reset Input | Active-low input with internal 10µA pull-up and debounce - accepts pushbutton or logic signal to force immediate RST low. |
| DVCC | Digital Logic Supply | Configures RST output drive strength: grounded → open-drain; ≥1.6V → push-pull to DVCC - decouples logic swing from VCC domain. |
| VCC | Analog/Digital Power Supply | Main supply powering comparators, reference, and internal logic; requires ≥0.1µF bypass capacitor to GND. |
| RST | Reset Output | Open-drain output weakly pulled to VCC; asserts low if any Vn falls below threshold - held low for configured timeout after recovery. |
| GND | Device Ground | Common reference for all analog and digital signals; connects internally to exposed pad. |
| REF | Buffered Reference Output | 1.195V ±12mV source/sink ≤±1mA - drives external resistor networks for PG programming without loading error. |
| PG1–PG4 | Threshold Select Inputs | Accept ratiometric voltage (0–VREF) to select one of 16 thresholds per channel using external 1% resistors. |
| V1–V4 | Monitor Inputs | Four independent voltage sensing nodes - support UV/OV/–V monitoring via +ADJ/–ADJ modes or fixed thresholds (5V to 1.0V). |
| OUT1–OUT4 | Individual Comparator Outputs | Real-time open-drain status outputs - each reflects instantaneous comparator state (low = fault); no built-in delay or latching. |
| RT | Reset Timeout Capacitor Input | Connect CRT to GND for adjustable timeout (12ms/nF); tie to VCC for fixed 200ms timeout - configures RST hold time after recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Individual open-drain outputs (OUT1–OUT4) | Enables per-rail power-good signaling, sequencer feedback, or independent fault flagging without shared reset timing constraints. |
| ±0.5% threshold accuracy over temperature | Reduces required system voltage margin by ~1% vs ±1% supervisors - relaxes power supply tolerance and enables smaller passive components. |
| 16 programmable thresholds per channel | Supports identical or mixed rail monitoring (e.g., 3.3V, 1.8V, 1.2V, –5V) using only standard 1% resistors - eliminates need for custom trimming. |
| +ADJ and –ADJ monitoring modes | 0.5V comparator reference enables flexible OV detection on positive rails or UV detection on negative supplies via external divider. |
| Reset disable (RDIS) and manual reset (MR) | Allows safe in-system voltage margining and field-service reset initiation without hardware modification or firmware intervention. |
Applications
| Telecom Power Shelf Monitoring | Server PSU Sequencing |
|---|---|
|
Use Scenario: Real-time supervision of +12V, +3.3V, +1.8V, and –48V rails in modular telecom power shelves with distributed control. IC Role / Device Role / Timing Role: LTC2964IUDC#TRPBF provides independent OUT1–OUT4 status flags for each rail, feeding into FPGA-based sequencer logic without propagation delay. Use Value: Eliminates need for discrete comparators and glue logic; ±0.5% accuracy ensures reliable detection at 95% of nominal rail voltage even at 85°C ambient. |
Use Scenario: Coordinating startup sequence of CPU core, memory, I/O, and auxiliary rails in dual-PSU server motherboards. IC Role / Device Role / Timing Role: LTC2964IUDC#TRPBF delivers asynchronous power-good signals (OUT1–OUT4) to enable staggered enable timing in PMBus-controlled sequencers. Use Value: No internal reset timeout delay preserves nanosecond-level timing fidelity between rail assertions - critical for DDR5 and PCIe 5.0 compliance. |
| Industrial PLC Power Management | Automotive ADAS Domain Controller |
|
Use Scenario: Monitoring redundant 24V, 5V, 3.3V, and isolated 12V analog sensor supplies in programmable logic controllers operating at –40°C to +70°C. IC Role / Device Role / Timing Role: LTC2964IUDC#TRPBF acts as primary voltage integrity monitor, with OUTn outputs driving watchdog inputs and fault LEDs independently. Use Value: I-grade temperature range and ±0.5% accuracy ensure deterministic behavior across full industrial thermal envelope without recalibration. |
Use Scenario: Supervising camera, radar, and SoC power rails (1.1V, 1.8V, 3.3V, 5V) in automotive ADAS domain controllers requiring AEC-Q100 Grade 2 compliance. IC Role / Device Role / Timing Role: LTC2964IUDC#TRPBF provides immediate fault indication via OUT1–OUT4 to ASIL-B safety manager, bypassing RST timing latency. Use Value: Individual outputs reduce diagnostic latency versus single-RST architectures - meets ISO 26262 requirement for <100µs fault-to-action response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2962IUD#TRPBF | 16-lead 3mm × 3mm QFN; single RST output with adjustable timeout; no individual OUT pins; no watchdog. | Used where consolidated reset assertion suffices and board space is constrained; lacks per-rail status visibility. | Select when system design requires only one reset signal and minimal footprint - not suitable for sequencer or status-flag use cases. |
| MAX6812HEUS+T | Quad 3.3V supervisor in SOT-23-8; fixed –4% thresholds; no programmability; no ±ADJ mode; no individual outputs. | Targeted at cost-sensitive, single-voltage applications with no margining or mixed-rail needs. | Choose only for simple 3.3V-only systems requiring basic reset generation - cannot replace LTC2964IUDC#TRPBF in programmable or multi-rail designs. |
Compared with LTC2962IUD#TRPBF and MAX6812HEUS+T, the LTC2964IUDC#TRPBF uniquely delivers real-time, independent comparator outputs for advanced power sequencing and diagnostics - making it irreplaceable in systems requiring per-rail visibility, adjustable thresholds, or negative/overvoltage monitoring.
Availability
LTC2964IUDC#TRPBF is available at Aetrix Electronics and suitable for telecom power shelf monitoring, server PSU sequencing, industrial PLC power management, and automotive ADAS domain controller applications requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial-grade temperature performance.
Supply support for LTC2964IUDC#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.
The LTC2964IUDC#TRPBF belongs to the LTC2962 family of configurable quad supervisors, designed specifically for high-accuracy, flexible power supply monitoring in mission-critical infrastructure where reliability, programmability, and real-time fault visibility are essential.
FAQ
What is the function of the OUT1–OUT4 pins on the LTC2964IUDC#TRPBF?
The OUT1–OUT4 pins on the LTC2964IUDC#TRPBF are individual open-drain comparator outputs that directly reflect the real-time state of each monitored voltage (V1–V4). Unlike the RST output, they assert immediately without any timeout delay - pulling low when the corresponding input falls below its programmed threshold (or rises above it in –ADJ mode). Each pin has a weak 6µA internal pull-up to VCC but supports external pull-up to higher logic supplies for VIH compliance and faster rise times. This makes LTC2964IUDC#TRPBF ideal for power sequencing and status flagging.
How does the LTC2964IUDC#TRPBF achieve ±0.5% threshold accuracy over temperature?
The LTC2964IUDC#TRPBF achieves ±0.5% threshold accuracy over temperature through a combination of a highly stable 1.195V ±12mV buffered bandgap reference (VREF), precision internal comparator offsets, and a 4-bit ADC-based threshold selection architecture that converts PG1–PG4 input voltages into digitally decoded thresholds. This architecture allows use of standard 1% external resistors while maintaining tight absolute accuracy across –40°C to +85°C - verified by production testing and characterized in the datasheet's Electrical Characteristics table.
Can the LTC2964IUDC#TRPBF monitor negative voltages?
Yes, the LTC2964IUDC#TRPBF can monitor negative voltages using its –ADJ mode. When a Vn input (e.g., V1) is configured to –ADJ via its corresponding PG pin, the internal comparator compares that input to the 0.5V reference. A negative supply (e.g., –5V) is monitored by connecting it through an external resistive divider that scales the negative voltage to 0.5V at the Vn pin when the rail is at its nominal value. The LTC2964IUDC#TRPBF's absolute maximum rating for V1–V4 is –0.3V to 6V, so proper scaling is required to avoid violating this limit - confirmed in the Absolute Maximum Ratings table.
What is the purpose of the RDIS pin on the LTC2964IUDC#TRPBF?
The RDIS (Reset Disable) pin on the LTC2964IUDC#TRPBF allows temporary inhibition of the RST output while preserving real-time OUT1–OUT4 status. Pulling RDIS low forces RST high regardless of V1–V4 states - enabling safe voltage margining tests (e.g., reducing a 1.2V rail to 1.15V) without triggering a system reset. The pin features an internal 10µA pull-up to VCC, so it may be left unconnected for normal operation. This function is explicitly documented in the Pin Functions section and supported across the full –40°C to +85°C temperature range.
Does the LTC2964IUDC#TRPBF include watchdog functionality like the LTC2963?
No, the LTC2964IUDC#TRPBF does not include watchdog functionality. It is explicitly differentiated from the LTC2963 in the Applications Information section: "LTC2964 Individual Outputs - The LTC2964 provides individual comparator outputs for each voltage input…". The pinout confirms absence of WDI, WDO, WDS, and WT pins - replaced by OUT1–OUT4. Watchdog features (adjustable timeout, status output, initial timeout selection) are exclusive to the LTC2963 variant and are not implemented in LTC2964IUDC#TRPBF silicon - verified by block diagram, pin listing, and functional description.
LTC2964IUDC#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)
LTC2964IUDC#TRPBF FAQ
1.How can I place an order for LTC2964IUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2964IUDC#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 LTC2964IUDC#TRPBF reliable?
The price and inventory of LTC2964IUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2964IUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2964IUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2964IUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2964IUDC#TRPBF?
LTC2964IUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2964IUDC#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 LTC2964IUDC#TRPBF?
For technical support, including LTC2964IUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2964IUDC#TRPBF requirements.
6.How does Aetrix verify that LTC2964IUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2964IUDC#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 LTC2964IUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2964IUDC#TRPBF?
All LTC2964IUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2964IUDC#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 LTC2964IUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC2964IUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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