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Analog Devices Inc. LTC1726ES8-2.5#PBF
- Part No.:
- LTC1726ES8-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1726ES8-2.5#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
LTC1726ES8-2.5#PBF from Analog Devices (formerly Linear Technology) is a triple supply monitor and microprocessor supervisory IC designed to simultaneously supervise 2.5V, 3.3V, and an adjustable voltage rail in embedded systems. It features ±1.5% threshold accuracy over temperature, 16µA typical supply current, adjustable reset timeout (via RT pin capacitor), and adjustable watchdog timeout (via WT pin capacitor). It delivers reliable power-on reset and brownout protection for portable battery-powered equipment and network servers.
For engineers reviewing the LTC1726ES8-2.5#PBF datasheet, LTC1726ES8-2.5#PBF pinout, LTC1726ES8-2.5#PBF application, or LTC1726ES8-2.5#PBF equivalent, key selection criteria include its 2.5V/3.3V/ADJ monitoring capability, guaranteed RST assertion down to VCC3 ≥ 1V or VCC25 ≥ 1V, open-drain active-low reset output, and MSOP/SO-8 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
The LTC1726ES8-2.5#PBF implements independent comparator-based monitoring of three voltage inputs: VCC25 (2.5V rail), VCC3 (3.3V rail), and VCCA (adjustable rail, nominal 1V trip). All three must exceed their respective thresholds-2.337V (VCC25), 3.085V (VCC3), and 1.000V (VCCA)-to deassert the open-drain RST output.
Reset assertion timing is controlled by an external capacitor on the RT pin (tRT = 3.30 × CRT), while watchdog timeout is set via CWT on the WT pin (tWT = 21.8 × CWT). The device draws power from whichever of VCC25 or VCC3 is higher, ensuring RST remains valid down to 1V on either supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC25 Threshold | 2.337V (±1.5% over temp); ensures accurate 2.5V rail supervision without false resets during voltage droop |
| VCC3 Threshold | 3.085V (±1.5% over temp); guarantees robust 3.3V supply monitoring across –40°C to 85°C |
| VCCA Threshold | 1.000V (±1.5% over temp); supports precise supervision of adjustable or low-voltage rails (e.g., 1.8V via divider) |
| Supply Current | 16µA typical; enables use in ultra-low-power battery-operated systems without compromising supervision integrity |
| RST Output Type | Active-low open-drain with weak internal pull-up to VCC3; allows flexible logic-level interfacing and wired-OR reset bus implementation |
| Reset Timeout Range | Adjustable from ~5ms to >1s via 1500pF–47nF capacitor on RT pin; accommodates diverse µP startup timing requirements |
| Watchdog Timeout Range | Adjustable from ~33ms to >1s via 1500pF–47nF capacitor on WT pin; aligns with software execution cycles for reliable fault detection |
Pinout & Package
Package: 8-Lead Plastic SO (S8), narrow 0.150-inch body, RoHS-compliant lead-free finish (PBF), operating temperature range –40°C to 85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input and auxiliary power source | Monitors 3.3V rail; powers internal circuitry when VCC3 > VCC25; requires 0.1µF ceramic bypass to GND |
| VCC25 (Pin 2) | 2.5V supply sense input and primary power source | Monitors 2.5V rail; powers internal circuitry when VCC25 > VCC3; requires 0.1µF ceramic bypass to GND |
| VCCA (Pin 3) | Adjustable rail sense input (1V nominal threshold) | Supports supervision of user-defined voltages (e.g., 1.8V via resistor divider); high-impedance input, can be tied to VCC3 or VCC25 if unused |
| GND (Pin 4) | Ground reference | Common return path for all analog comparators and digital logic; must be low-impedance connection |
| WDI (Pin 5) | Watchdog input trigger | Edge-sensitive input (rising/falling); must be toggled within tWT period to prevent reset; leakage ±1µA |
| RST (Pin 6) | Active-low open-drain reset output | Asserted low during power-up, brownout, or watchdog timeout; weak internal pull-up to VCC3 (~6µA); supports external pull-up to higher voltage |
| WT (Pin 7) | Watchdog timeout timing node | Capacitor-connected node (CWT to GND); sets tWT = 21.8 × CWT (µs); grounding disables watchdog function |
| RT (Pin 8) | Reset timeout timing node | Capacitor-connected node (CRT to GND); sets tRT = 3.30 × CRT (µs); determines minimum reset pulse width after power stabilization |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring with configurable rail selection | Simultaneously supervises 2.5V, 3.3V, and adjustable rail; supports dual-rail operation (e.g., disable VCCA) via pin strapping |
| ±1.5% threshold accuracy over full temperature range | Eliminates need for external calibration; ensures deterministic reset behavior across –40°C to 85°C without derating |
| Glitch-immune reset generation | Immune to sub-130µs supply transients; prevents spurious resets during noisy power sequencing or ESD events |
| Guaranteed RST validity down to 1V supply | Ensures correct reset state even during deep brownout on VCC25 or VCC3, critical for safe system shutdown |
| Low 16µA quiescent current | Reduces standby power in always-on subsystems; extends battery life in portable instrumentation and IoT edge nodes |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Monitoring ATX 3.3V, 2.5V (CPU core), and 1.8V (memory) rails during cold boot and thermal throttling. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST until all rails stabilize above thresholds; adjustable reset timeout accommodates slow-ramping VRMs. Use Value: Prevents CPU lockup or memory corruption by enforcing strict power-good sequencing before BIOS execution begins. |
Use Scenario: Supervising main 3.3V, 2.5V SoC I/O, and adjustable 1.2V GPU core rail in space-constrained laptop motherboards. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete supervisors; open-drain RST interfaces directly with EC (Embedded Controller) reset input. Use Value: Reduces BOM count and PCB area vs. multiple discrete monitors while maintaining ±1.5% accuracy under thermal stress. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring clean power-up of FPGA, ADC, and precision DAC in handheld test equipment with multi-rail DC/DC converters. IC Role / Device Role / Timing Role: Monitors 3.3V digital, 2.5V analog reference, and adjustable 1.8V FPGA core; watchdog guards against firmware hangs during measurement cycles. Use Value: Eliminates field failures caused by marginal power sequencing or unhandled software exceptions in mission-critical instruments. |
Use Scenario: Managing power integrity in medical glucose meters or portable ultrasound devices using Li-ion batteries and buck-boost regulators. IC Role / Device Role / Timing Role: Supervises 3.3V MCU, 2.5V sensor interface, and adjustable 1.5V RF front-end; ultra-low 16µA current preserves battery runtime. Use Value: Extends usable battery life by >10% vs. higher-current supervisors while guaranteeing safe shutdown below 2.8V battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1326-2.5 | ±0.75% threshold accuracy (tighter), 5V/3.3V/ADJ variant not applicable; same 2.5V/3.3V/ADJ monitoring capability | Higher accuracy required for precision data acquisition systems where 1.5% drift could affect calibration stability | Select LTC1326-2.5 when absolute threshold tolerance is critical; note higher cost and identical SO-8 footprint |
| LTC1727-2.5 | Individual open-drain RST outputs per rail (RST25, RST3, RSTA) vs. single shared RST; same ±1.5% accuracy and timing adjustability | Required when system diagnostics need to identify which specific rail failed (e.g., server BMC logging) | Choose LTC1727-2.5 for fault-isolation capability; accepts same external capacitors but requires additional PCB routing |
Compared with LTC1326-2.5 and LTC1727-2.5, the LTC1726ES8-2.5#PBF offers optimal balance of accuracy, low power, and simplicity for cost-sensitive applications where single-reset-bus architecture suffices and ±1.5% tolerance meets design margins.
Availability
LTC1726ES8-2.5#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 consistent parametric performance.
Supply support for LTC1726ES8-2.5#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 for precision instrumentation, communications, and power management.
The LTC1726 product line was developed to provide highly accurate, low-power, multi-rail supervision for complex embedded systems where reliability across temperature and supply variation is non-negotiable.
FAQ
What voltage rails does the LTC1726ES8-2.5#PBF monitor?
The LTC1726ES8-2.5#PBF monitors three voltage rails: VCC25 (2.5V supply, threshold 2.337V), VCC3 (3.3V supply, threshold 3.085V), and VCCA (adjustable rail, threshold 1.000V). Its "-2.5" suffix denotes factory-trimmed thresholds optimized for 2.5V/3.3V/ADJ configurations, distinguishing it from the "-5" variant for 5V/3.3V/ADJ systems.
How is the reset timeout period adjusted on the LTC1726ES8-2.5#PBF?
The reset timeout period on the LTC1726ES8-2.5#PBF is adjusted by connecting an external capacitor (CRT) between the RT pin (Pin 8) and ground. The relationship is tRT = 3.30 × CRT, where tRT is in microseconds and CRT is in picofarads. For example, a 47nF capacitor yields a 155ms reset timeout. Ceramic capacitors are recommended for low leakage.
Can the LTC1726ES8-2.5#PBF operate with only two supply rails?
Yes, the LTC1726ES8-2.5#PBF can be configured to monitor only two rails. VCCA may be tied to VCC3 or VCC25 if unused, and the watchdog function can be disabled by grounding both WDI and WT pins. This reduces the device to a dual-rail supervisor with adjustable reset timing, preserving all accuracy and low-power benefits.
What is the minimum supply voltage that guarantees correct RST output state for the LTC1726ES8-2.5#PBF?
The LTC1726ES8-2.5#PBF guarantees correct RST logic state (low when asserted, high-impedance when deasserted) for VCC3 ≥ 1V or VCC25 ≥ 1V. This ensures reliable reset assertion during deep brownout conditions, a critical feature for fail-safe shutdown in industrial and medical equipment powered by the LTC1726ES8-2.5#PBF.
Is the LTC1726ES8-2.5#PBF pin-compatible with other SO-8 supervisory ICs?
The LTC1726ES8-2.5#PBF uses a standard 8-lead SOIC (S8) package with industry-standard pinout (VCC3, VCC25, VCCA, GND, WDI, RST, WT, RT). While not drop-in compatible with all SO-8 supervisors due to functional differences (e.g., triple monitoring vs. single-rail), its physical footprint matches common SO-8 footprints, enabling layout reuse when migrating from similar Linear/Analog Devices supervisors like LTC1727-2.5.
LTC1726ES8-2.5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.337V, 3.085V, 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-SO
LTC1726ES8-2.5#PBF FAQ
1.How can I place an order for LTC1726ES8-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1726ES8-2.5#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 LTC1726ES8-2.5#PBF reliable?
The price and inventory of LTC1726ES8-2.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1726ES8-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1726ES8-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1726ES8-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1726ES8-2.5#PBF?
LTC1726ES8-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1726ES8-2.5#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 LTC1726ES8-2.5#PBF?
For technical support, including LTC1726ES8-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1726ES8-2.5#PBF requirements.
6.How does Aetrix verify that LTC1726ES8-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1726ES8-2.5#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 LTC1726ES8-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1726ES8-2.5#PBF?
All LTC1726ES8-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1726ES8-2.5#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 LTC1726ES8-2.5#PBF part is unused and in its original packaging.
Return procedure for LTC1726ES8-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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