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Analog Devices Inc. LTC1726EMS8-5#PBF
- Part No.:
- LTC1726EMS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1726EMS8-5#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,636
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Product details
Overview
LTC1726EMS8-5#PBF from Analog Devices (formerly Linear Technology) is a triple supply monitor and microprocessor supervisory IC with adjustable reset and watchdog timer functions, designed for systems requiring simultaneous monitoring of 5V, 3.3V, and an adjustable voltage rail. It features ±1.5% threshold accuracy over temperature, 16µA typical supply current, and guaranteed RST assertion down to VCC3 ≥ 1V or VCC5 ≥ 1V. It is used in desktop and notebook computers to ensure reliable power-on reset sequencing and system-level fault recovery.
For engineers reviewing the LTC1726EMS8-5#PBF datasheet, LTC1726EMS8-5#PBF pinout, LTC1726EMS8-5#PBF application, or LTC1726EMS8-5#PBF equivalent, key selection considerations include its 5V/3.3V/ADJ triple-monitor capability, externally adjustable reset and watchdog timeout periods via capacitors on RT and WT pins, open-drain active-low RST output with weak internal pull-up to VCC3, and MS8 package compatibility with space-constrained embedded designs.
Technical Context
The LTC1726EMS8-5#PBF integrates three independent voltage comparators (for VCC5 = 5V, VCC3 = 3.3V, and VCCA = adjustable), a programmable reset timer (tRT = 3.30 × CRT), and a programmable watchdog timer (tWT = 21.8 × CWT). Its internal bandgap reference enables ±1.5% trip threshold accuracy across –40°C to +85°C.
It supports flexible configuration: monitors all three supplies by default, but can be configured for dual- or single-supply operation; includes VCC5 override logic that disables 5V monitoring when VCC5 ≈ VCC3 ±25mV and <4.15V; RST remains valid even as VCC3 or VCC5 drops to 1V, ensuring robust brownout detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC5 Threshold | 4.675V ±1.5% - precise 5V rail monitoring with tight tolerance for clean reset assertion during power-up/brownout |
| VCC3 Threshold | 3.085V ±1.5% - accurate 3.3V rail supervision compatible with standard logic supply levels |
| VCCA Threshold | 1.000V ±1.5% - high-impedance adjustable input for custom rail monitoring (e.g., 1.8V via resistor divider) |
| Supply Current | 16µA typical - ultra-low quiescent current enabling use in battery-powered and energy-sensitive systems |
| RST Output Type | Active-low open-drain with weak 6µA internal pull-up to VCC3 - allows level-shifting and wired-OR reset bus implementation |
| Reset Timeout Range | Adjustable from ~5ms to >1s via external capacitor on RT pin (tRT = 3.30 × CRT in µs/pF) - supports diverse µP initialization timing requirements |
| Watchdog Timeout Range | Adjustable from ~33ms to >1s via external capacitor on WT pin (tWT = 21.8 × CWT in µs/pF) - configurable software execution window monitoring |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm, lead-free finish, –40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input & auxiliary power source | Senses 3.3V rail; powers internal circuitry when VCC3 > VCC5; requires 0.1µF ceramic bypass to GND |
| VCC5 (Pin 2) | 5V supply sense input & auxiliary power source | Senses 5V rail; powers internal circuitry when VCC5 > VCC3; requires 0.1µF ceramic bypass to GND |
| VCCA (Pin 3) | Adjustable voltage sense input (1V nominal) | High-impedance input for monitoring custom rails (e.g., 1.8V via resistor divider); can be tied to VCC3 or VCC5 if unused |
| GND (Pin 4) | Ground reference | Common return path for all internal comparators and timers; must be low-impedance connection |
| WDI (Pin 5) | Watchdog input | Edge-triggered input; rising/falling edge resets watchdog timer; must be toggled within tWT to prevent RST assertion |
| RST (Pin 6) | Reset logic output | Active-low open-drain output; asserted when any monitored rail falls below threshold or watchdog times out; weak internal pull-up to VCC3 |
| WT (Pin 7) | Watchdog time-out timing node | Capacitor-connected node setting tWT = 21.8 × CWT; grounding disables watchdog function |
| RT (Pin 8) | Reset time-out timing node | Capacitor-connected node setting tRT = 3.30 × CRT; determines duration RST stays asserted after all rails are valid |
Key Features
| Feature | Design Value |
|---|---|
| Tight ±1.5% threshold accuracy over temperature | Ensures consistent reset behavior across –40°C to +85°C without calibration or trimming |
| Glitch-immune comparator architecture | Rejects sub-130µs supply transients, preventing false resets during noisy power transitions |
| Guaranteed RST validity down to 1V supply | Enables reliable reset assertion during deep brownout conditions where VCC3 or VCC5 collapses to 1V |
| VCC5 override mode (5V version only) | Automatically disables 5V monitoring when VCC5 ≈ VCC3 ±25mV and <4.15V, allowing seamless 3.3V-only operation |
| Low 16µA supply current | Minimizes system standby power consumption-critical for portable and always-on embedded devices |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
|
Use Scenario: Power-on sequence control and multi-rail validation during cold boot and resume-from-suspend. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST until 5V, 3.3V, and core voltage (via VCCA) all stabilize above thresholds, then holding reset for user-defined tRT. Use Value: Prevents CPU/Memory initialization before stable power delivery, eliminating boot failures caused by marginal rail timing. |
Use Scenario: Battery-backed system health monitoring during AC loss and low-power states. IC Role / Device Role / Timing Role: Monitors main 5V/3.3V rails and adjustable VCCA (e.g., 1.8V DDR supply) while enabling watchdog supervision of firmware execution during sleep modes. Use Value: Detects hung firmware or undervoltage events during suspend-to-RAM, triggering controlled shutdown or wake-up reset. |
| Intelligent Instruments | Network Servers |
|
Use Scenario: Precision analog subsystem power integrity assurance in data acquisition units. IC Role / Device Role / Timing Role: Supervises isolated 5V analog supply, 3.3V digital core, and adjustable VCCA (e.g., 2.5V ADC reference) with independent threshold accuracy. Use Value: Guarantees measurement validity by preventing analog front-end activation until all critical rails meet ±1.5% tolerance. |
Use Scenario: Redundant power supply failover coordination and motherboard-level fault containment. IC Role / Device Role / Timing Role: Simultaneously monitors primary 5V standby, 3.3V main, and adjustable VCCA (e.g., 12V-to-3.3V DC/DC feedback node) to trigger platform reset on first rail failure. Use Value: Enables deterministic, sub-200ms system reset upon single-point power fault-meeting enterprise server RAS requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1727-5 | Provides individual open-drain RST outputs per monitored rail (RST5, RST3, RSTA) instead of common RST; same thresholds and timing adjustability | Required when system-level diagnostics need per-rail fault isolation rather than aggregated reset assertion | Select LTC1727-5 if independent rail failure reporting is needed; otherwise LTC1726EMS8-5#PBF offers simpler wiring and lower pin count |
| LTC1326-5 | ±0.75% threshold accuracy (tighter), but fixed 4.725V/3.118V/1.0V thresholds; no adjustable tRT/tWT; SO-8 only | Suitable for cost-sensitive, high-volume applications where precision outweighs configurability and MSOP footprint is not required | Choose LTC1326-5 for higher accuracy in fixed-threshold designs; LTC1726EMS8-5#PBF preferred when adjustable timing or MSOP packaging is essential |
Compared with LTC1727-5, LTC1726EMS8-5#PBF simplifies board layout with a single RST net but sacrifices per-rail fault visibility; compared with LTC1326-5, it trades ±0.75% accuracy for field-programmable timing and wider supply range support, making it more adaptable to evolving design requirements.
Availability
LTC1726EMS8-5#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1726EMS8-5#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1726 product line delivers precision, low-power supervisory ICs for mission-critical power sequencing and system reliability in computing, instrumentation, and communications infrastructure.
FAQ
What is the function of the VCCA pin on the LTC1726EMS8-5#PBF?
The VCCA pin on the LTC1726EMS8-5#PBF is a high-impedance, adjustable-voltage sense input with a nominal 1.000V ±1.5% threshold. It enables monitoring of custom supply rails-such as 1.8V or 2.5V-using an external resistor divider. When unused, VCCA may be tied to VCC3 or VCC5; it does not serve as a power supply pin due to its limited 1V operating range.
How do I configure the LTC1726EMS8-5#PBF to monitor only two supplies instead of three?
The LTC1726EMS8-5#PBF can be configured for dual-supply monitoring by tying the unused VCCA pin to either VCC3 or VCC5 (per datasheet guidance), effectively disabling its independent threshold detection. For example, connecting VCCA to VCC3 configures the device to supervise only VCC5 and VCC3. The part retains full reset and watchdog functionality with no change to timing or output behavior.
What is the maximum recommended capacitor value for the RT pin on the LTC1726EMS8-5#PBF?
The LTC1726EMS8-5#PBF datasheet specifies no absolute maximum for the RT capacitor, but practical limits arise from leakage and timing resolution. For reliable operation, ceramic capacitors up to 100nF are recommended. At CRT = 47nF, tRT = 155ms; scaling linearly, 100nF yields ~303ms. Larger values increase sensitivity to capacitor leakage, potentially causing timing drift-especially at temperature extremes.
Does the LTC1726EMS8-5#PBF support watchdog disable, and how is it implemented?
Yes, the LTC1726EMS8-5#PBF supports watchdog disable. To disable the watchdog function, connect both WDI (Pin 5) and WT (Pin 7) directly to GND. This prevents watchdog timer activation while preserving full triple-supply monitoring and adjustable reset timing via the RT pin. The device then operates strictly as a supervisor with no periodic WDI edge requirement.
What is the purpose of the VCC5 override feature in the LTC1726EMS8-5#PBF?
The VCC5 override feature in the LTC1726EMS8-5#PBF automatically disables the 5V monitoring function when VCC5 ≈ VCC3 ±25mV and VCC5 < 4.15V. This allows the same device to operate as a 3.3V-only supervisor in systems where the 5V rail is absent or shared with VCC3, eliminating the need for separate part numbers and simplifying BOM management across platform variants.
LTC1726EMS8-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.085V, 4.675V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1726EMS8-5#PBF FAQ
1.How can I place an order for LTC1726EMS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1726EMS8-5#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 LTC1726EMS8-5#PBF reliable?
The price and inventory of LTC1726EMS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1726EMS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1726EMS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1726EMS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1726EMS8-5#PBF?
LTC1726EMS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1726EMS8-5#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 LTC1726EMS8-5#PBF?
For technical support, including LTC1726EMS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1726EMS8-5#PBF requirements.
6.How does Aetrix verify that LTC1726EMS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1726EMS8-5#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 LTC1726EMS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1726EMS8-5#PBF?
All LTC1726EMS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1726EMS8-5#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 LTC1726EMS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1726EMS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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