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Analog Devices Inc. LTC1726HMS8-5#PBF
- Part No.:
- LTC1726HMS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1726HMS8-5#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:751
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Product details
Overview
LTC1726HMS8-5#PBF from Analog Devices (formerly Linear Technology) is a triple supply monitor and microprocessor supervisory IC with adjustable reset timeout, adjustable watchdog timer, and ±1.5% threshold accuracy over temperature. It monitors 5V, 3.3V, and an adjustable input simultaneously, guarantees correct RST state down to VCC ≥ 1V, and draws only 16µA typical supply current - ideal for desktop computers, network servers, and portable battery-powered equipment requiring reliable power sequencing and brownout protection.
For engineers reviewing the LTC1726HMS8-5#PBF datasheet, LTC1726HMS8-5#PBF pinout, LTC1726HMS8-5#PBF application, or LTC1726HMS8-5#PBF equivalent, key selection considerations include its H-grade industrial temperature range (–40°C to +125°C), MS8 package footprint, open-drain active-low RST output, and capacitor-adjustable timing for both reset and watchdog functions.
Technical Context
The LTC1726HMS8-5#PBF integrates three independent voltage comparators with precision bandgap references, a programmable reset pulse generator, and a watchdog timer with edge-triggered WDI input. Its internal power detection circuit selects VCC3 or VCC5 as the supply source depending on which exceeds the other by >25mV, enabling robust operation during asymmetric power-up sequences.
Reset assertion is guaranteed when any monitored supply falls below its threshold (VRT5 = 4.600–4.750V, VRT3 = 3.036–3.135V, VRTA = 0.985–1.015V), and remains asserted for a user-defined period (tRT = 3.30 × CRT) after all supplies stabilize. The watchdog timeout (tWT = 21.8 × CWT) is independently adjustable and restarts on each WDI edge, providing fail-safe µP supervision without fixed timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | Three independent inputs: VCC5 (4.60–4.75V threshold), VCC3 (3.04–3.14V), VCCA (0.99–1.02V) - supports simultaneous 5V/3.3V/adjustable rail monitoring |
| Threshold Accuracy | ±1.5% over –40°C to +125°C - ensures reliable reset assertion across full industrial temperature range without calibration |
| Reset Timeout Range | Adjustable via external CRT capacitor: tRT = 3.30 × CRT (e.g., 47nF → 155ms) - accommodates diverse µP power-on initialization delays |
| Watchdog Timeout Range | Adjustable via external CWT capacitor: tWT = 21.8 × CWT (e.g., 47nF → 1s) - enables software execution time alignment without firmware changes |
| Supply Current | 16µA typical at 25°C - minimizes quiescent load in always-on power domains of battery-powered systems |
| RST Output Type | Active-low open-drain with weak internal pull-up to VCC3 - allows level-shifting to 5V logic and wired-OR reset bus implementation |
| Operating Temperature | –40°C to +125°C (H-grade) - qualified for under-hood automotive, industrial control, and high-ambient computing environments |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, exposed pad not present. RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input & auxiliary power source | Monitors 3.3V rail; powers internal circuitry when VCC3 > VCC5; requires 0.1µF ceramic bypass to GND |
| VCC5 (Pin 2) | 5V supply sense input & primary power source | Monitors 5V rail; powers device when VCC5 > VCC3; overrides VCC3-based operation above ~4.15V |
| VCCA (Pin 3) | Adjustable threshold input (1V nominal) | Sense input for third supply (e.g., 1.8V via resistor divider); high-impedance; can be tied to VCC3 or VCC5 if unused |
| GND (Pin 4) | Analog and digital ground reference | Common return path for all comparators, timers, and RST output; must be low-impedance connection |
| WDI (Pin 5) | Watchdog input trigger | Edge-sensitive input (rising/falling); clears watchdog timer on transition; must be toggled within tWT to prevent reset |
| RST (Pin 6) | Active-low open-drain reset output | Asserted low during power-up/brownout; deasserted after tRT; compatible with 3.3V/5V logic buses via external pull-up |
| WT (Pin 7) | Watchdog timeout capacitor connection | Connect CWT to GND to set tWT = 21.8 × CWT; grounding disables watchdog function |
| RT (Pin 8) | Reset timeout capacitor connection | Connect CRT to GND to set tRT = 3.30 × CRT; determines minimum reset assertion duration post-power-up |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring with override logic | Automatically selects between 5V and 3.3V monitoring modes based on relative input voltages - eliminates need for external mode selection |
| Glitch-immune comparator architecture | Rejects sub-130µs supply transients - prevents false resets during noisy power transitions or ESD events |
| Guaranteed RST validity down to 1V | RST output remains correctly asserted/deasserted even when VCC3 or VCC5 drops to 1V - ensures clean reset during deep brownout |
| Capacitor-programmable timing | Independent CRT and CWT capacitors enable precise, board-level tuning of reset and watchdog periods without firmware updates |
| H-grade temperature qualification | Full electrical performance validated from –40°C to +125°C - suitable for extended-temperature industrial and transportation applications |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Power sequencing and fault detection across 5V, 3.3V, and 1.8V rails during cold boot and thermal throttling. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST until all rails stabilize, then holding reset for 155ms while CPU initializes. Use Value: Prevents corrupted BIOS execution by ensuring stable VCC before release, leveraging ±1.5% thresholds to tolerate rail tolerances. |
Use Scenario: Battery-backed system supervision during AC-to-DC switchover and low-battery shutdown sequences. IC Role / Device Role / Timing Role: Monitors main 5V adapter, 3.3V logic, and adjustable 1.2V core rail; triggers graceful OS shutdown on undervoltage. Use Value: 16µA quiescent current extends battery life in suspend mode; open-drain RST interfaces directly with PMIC reset inputs. |
| Network Servers | Intelligent Instruments |
Use Scenario: Redundant power supply monitoring and watchdog enforcement in multi-CPU blade servers. IC Role / Device Role / Timing Role: Supervises primary and backup 5V/3.3V supplies; asserts RST if either fails, while WDI verifies host firmware liveness. Use Value: Independent tRT and tWT adjustment allows synchronization with server BIOS POST timing and watchdog heartbeat intervals. |
Use Scenario: Precision sensor node power integrity in field-deployed test equipment operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Monitors isolated 5V analog supply, 3.3V digital supply, and 2.5V ADC reference; guarantees reset during thermal derating. Use Value: H-grade (–40°C to +125°C) operation ensures reliability in uncooled enclosures; ±1.5% thresholds maintain accuracy across temperature drift. |
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 | Individual open-drain RST outputs per supply (RST5, RST3, RSTA) vs single shared RST; same thresholds and timing adjustability | Required when system needs independent reset signaling per rail (e.g., staggered power domain enable) | Select LTC1727-5 only if discrete reset control per supply is mandatory; otherwise LTC1726HMS8-5#PBF offers simpler routing and lower cost |
| LTC1326-2.5 | Higher threshold accuracy (±0.75% vs ±1.5%), but configured for 2.5V/3.3V/ADJ - lacks 5V monitoring capability | Applicable only in 2.5V-based systems (e.g., low-voltage FPGAs); cannot replace LTC1726HMS8-5#PBF in 5V architectures | Choose LTC1326-2.5 only for new 2.5V designs demanding tighter threshold tolerance; not a functional substitute for 5V monitoring |
Compared with LTC1727-5, LTC1726HMS8-5#PBF simplifies PCB layout with a single RST net but sacrifices per-rail reset control; compared with LTC1326-2.5, it supports 5V systems at the cost of reduced threshold precision - making it the optimal choice for cost-sensitive, 5V/3.3V dual-rail industrial computing.
Availability
LTC1726HMS8-5#PBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and extended-temperature performance.
Supply support for LTC1726HMS8-5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1726 family.
The LTC1726 belongs to Linear's precision power supervision product line, designed specifically for high-reliability computing and instrumentation systems requiring accurate multi-rail monitoring and fail-safe µP supervision.
FAQ
What is the operating temperature range for the LTC1726HMS8-5#PBF?
The LTC1726HMS8-5#PBF is rated for –40°C to +125°C (H-grade), fully specified across this range for all electrical parameters including threshold accuracy, supply current, and timing characteristics. This qualifies it for under-hood automotive, industrial control, and high-ambient computing applications where standard E-grade (–40°C to +85°C) parts would fail.
How does the LTC1726HMS8-5#PBF handle power-up when both 5V and 3.3V supplies ramp simultaneously?
The LTC1726HMS8-5#PBF uses internal override logic: when VCC5 ≈ VCC3 (within ±25mV) and VCC5 < 4.15V, it operates as a 3.3V monitor; above ~4.15V, it switches to 5V monitoring mode. This ensures RST remains asserted until the dominant supply reaches its valid threshold - preventing premature release during overlapping ramps.
Can the watchdog timer in the LTC1726HMS8-5#PBF be disabled?
Yes. The watchdog timer is disabled by connecting both WDI (Pin 5) and WT (Pin 7) to GND. In this configuration, the LTC1726HMS8-5#PBF functions solely as a triple-supply monitor with adjustable reset timeout, eliminating software dependency while retaining all voltage supervision features.
What capacitor values are recommended for a 155ms reset timeout and 1s watchdog timeout with the LTC1726HMS8-5#PBF?
For tRT = 155ms: CRT = tRT / 3.30 = 155,000µs / 3.30 ≈ 47,000pF (47nF). For tWT = 1s: CWT = tWT / 21.8 = 1,000,000µs / 21.8 ≈ 45,870pF (47nF). Both use standard 47nF ceramic capacitors - confirmed in Linear's Typical Application TA01 and TA02 schematics for the LTC1726-5 variant.
Is the LTC1726HMS8-5#PBF pin-compatible with other variants like the LTC1726EMS8-5#PBF?
Yes - all LTC1726-5 variants (E, I, H grades) in the MS8 package share identical pinout, footprint, and electrical interface. The only differences are temperature rating and parametric limits (e.g., H-grade guarantees ±1.5% thresholds at +125°C, while E-grade does so only to +85°C). No PCB redesign is needed when upgrading from E- to H-grade.
LTC1726HMS8-5#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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1726HMS8-5#PBF FAQ
1.How can I place an order for LTC1726HMS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1726HMS8-5#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 LTC1726HMS8-5#PBF reliable?
The price and inventory of LTC1726HMS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1726HMS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1726HMS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1726HMS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1726HMS8-5#PBF?
LTC1726HMS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1726HMS8-5#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 LTC1726HMS8-5#PBF?
For technical support, including LTC1726HMS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1726HMS8-5#PBF requirements.
6.How does Aetrix verify that LTC1726HMS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1726HMS8-5#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 LTC1726HMS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1726HMS8-5#PBF?
All LTC1726HMS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1726HMS8-5#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 LTC1726HMS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1726HMS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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