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Analog Devices Inc./Maxim Integrated DS1811-5+
- Part No.:
- DS1811-5+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
DS1811-5+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:109
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Product details
Overview
DS1811-5+ from Maxim Integrated is a 5V precision voltage-monitoring reset supervisor IC with open-drain output, 4.62V typical VCC trip point, 150ms reset timeout, and -40°C to +85°C operating range. It automatically asserts an active-low reset signal during power failure or brownout to safeguard microprocessor startup in embedded control systems.
For engineers reviewing the DS1811-5+ datasheet, DS1811-5+ pinout, DS1811-5+ application, or DS1811-5+ equivalent, key selection criteria include guaranteed 4.50–4.75V trip window, internal 5.5kΩ pull-up resistor, 10mA sink capability, and dual TO-92/SOT-23 package support for space-constrained or through-hole designs.
Technical Context
The DS1811-5+ uses an internal temperature-compensated voltage reference and comparator to continuously monitor VCC against a fixed 4.62V threshold. When VCC drops below the trip point, RST is immediately asserted low; upon recovery, RST remains active for 150ms (min 100ms, max 300ms) to ensure system stabilization.
Its open-drain RST output supports wired-OR configurations and interfaces directly with 5V-tolerant microcontroller reset inputs. The device draws only 30–40µA quiescent current and operates across the full industrial temperature range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50V (min) to 4.75V (max); ensures reliable reset assertion during 5V supply brownout |
| Reset Timeout | 100–300ms; guarantees sufficient hold time for processor and power rail stabilization |
| Output Type | Open-drain RST with internal 5.5kΩ pull-up; enables flexible logic-level interfacing and bus sharing |
| Sink Current | 10mA @ 0.4V; drives standard CMOS/TTL reset inputs without external buffer |
| Supply Range | 1.2V to 5.5V; supports operation down to battery-backed or low-voltage auxiliary rails |
| Quiescent Current | 30–40µA; minimizes standby power in always-on monitoring applications |
Pinout & Package
DS1811-5+ is available in both TO-92 and SOT-23 packages. Both variants share identical pin functions and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low open-drain reset output | Asserts low during VCC fault or power-up; requires external pull-up only if internal 5.5kΩ is insufficient |
| VCC | Power supply input | Monitored rail input; powers internal reference and comparator circuitry |
| GND | Ground reference | Common return path for VCC and RST; must be low-impedance for accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitoring | Factory-trimmed 4.62V trip point with ±2.5% tolerance over temperature ensures consistent brownout detection |
| Guaranteed reset timing | 150ms nominal timeout provides deterministic delay for microprocessor clock and memory initialization |
| Integrated pull-up resistor | 5.5kΩ internal pull-up eliminates need for discrete resistor in most 5V systems |
| Low-power operation | 30–40µA ICC enables use in battery-powered or energy-sensitive applications without compromising supervision integrity |
Applications
| Industrial PLC Controller | Smart Metering System |
|---|---|
Use Scenario: Power interruption during firmware update or data logging causes unsafe state transitions. IC Role / Device Role / Timing Role: DS1811-5+ monitors 5V rail and forces hard reset before corrupted execution resumes. Use Value: Prevents flash corruption and maintains meter calibration integrity via guaranteed 150ms reset hold. | Use Scenario: Mains voltage sags below 4.5V during grid instability, risking incomplete EEPROM writes. IC Role / Device Role / Timing Role: DS1811-5+ detects sub-threshold VCC and holds microcontroller in reset until stable 5V returns. Use Value: Ensures atomic write cycles complete or abort cleanly, preserving billing accuracy and tamper logs. |
| Embedded HVAC Controller | Point-of-Sale Terminal |
Use Scenario: Transient load switching induces 5V rail droop, causing erratic sensor readings or relay chatter. IC Role / Device Role / Timing Role: DS1811-5+ acts as dedicated power supervisor, isolating MCU reset from noisy analog sections. Use Value: Eliminates spurious reboots by enforcing minimum 100ms reset pulse even after brief dips. | Use Scenario: Battery backup switchover introduces momentary 5V dropout during AC loss. IC Role / Device Role / Timing Role: DS1811-5+ extends reset assertion across switchover gap to prevent transaction rollback errors. Use Value: Guarantees transactional consistency by holding reset until both main and backup rails stabilize. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809S+T | 4.63V trip point, 140ms reset timeout, push-pull output | Requires external pull-up for wired-OR; less suitable for shared reset buses | Preferred when board layout lacks space for external pull-up and push-pull drive is acceptable |
| TPS3808G15DBVR | 4.63V trip, adjustable reset delay up to 200ms, higher ICC (1.2µA) | Programmable delay adds flexibility but increases BOM count and design complexity | Chosen when variable timeout is required for multi-rail sequencing or custom stabilization windows |
Compared with MAX809S+T and TPS3808G15DBVR, the DS1811-5+ offers integrated pull-up and fixed 150ms timing-reducing component count and simplifying validation-while maintaining identical trip accuracy and industrial temperature support.
Availability
DS1811-5+ is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering systems, and embedded HVAC controllers requiring stable component supply and long-term lifecycle assurance.
Supply support for DS1811-5+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The DS1811-5+ belongs to the EconoReset family-engineered for cost-sensitive, high-volume embedded systems needing reliable, single-supply reset supervision without external components.
FAQ
What is the exact VCC trip voltage range for DS1811-5+?
The DS1811-5+ has a guaranteed VCC trip point between 4.50V and 4.75V at +25°C, with typical value 4.62V. This window is factory-trimmed and temperature-compensated to maintain stability across the full -40°C to +85°C operating range. The DS1811-5+ datasheet specifies this tolerance under DC Electrical Characteristics, ensuring predictable brownout response in 5V systems.
Does DS1811-5+ require an external pull-up resistor on the RST pin?
No, DS1811-5+ includes an internal 5.5kΩ pull-up resistor on the open-drain RST output. This eliminates the need for an external resistor in standard 5V systems. However, if interfacing with higher-voltage logic or driving heavy capacitive loads (>10pF), an external pull-up may be added to reduce rise time-though the DS1811-5+ itself functions correctly without it.
How long does the DS1811-5+ hold reset active after VCC recovers?
The DS1811-5+ holds the RST pin active low for 100ms to 300ms after VCC rises above the trip threshold, with a typical duration of 150ms. This timeout is internally generated and independent of external components. The DS1811-5+ specification guarantees this delay meets microprocessor stabilization requirements for clock lock, memory initialization, and peripheral configuration.
Can DS1811-5+ operate from a 3.3V supply?
Yes, DS1811-5+ operates from 1.2V to 5.5V, but its 4.50–4.75V trip point means it cannot supervise a 3.3V rail-it will assert reset continuously. The DS1811-5+ is specifically designed for 5V systems. For 3.3V supervision, consider DS1811-33+ or other variants with matching trip thresholds; the DS1811-5+ must be used only where monitored VCC ≈ 5V.
What package options are available for DS1811-5+?
DS1811-5+ is offered in both TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Pinout is identical across both: Pin 1 = RST, Pin 2 = VCC, Pin 3 = GND. Mechanical drawings for both packages are published by Maxim Integrated, and the DS1811-5+ datasheet confirms functional equivalence regardless of package choice.
DS1811-5+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS1811-5+ FAQ
1.How can I place an order for DS1811-5+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1811-5+ 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 DS1811-5+ reliable?
The price and inventory of DS1811-5+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1811-5+ is usually 5 days.
3.What payment methods are accepted for DS1811-5+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1811-5+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1811-5+?
DS1811-5+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1811-5+ 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 DS1811-5+?
For technical support, including DS1811-5+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1811-5+ requirements.
6.How does Aetrix verify that DS1811-5+ is sourced from the original manufacturer or authorized distributors?
All DS1811-5+ 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 DS1811-5+ meets industry standards.
7.What is the process for return or replacement of DS1811-5+?
All DS1811-5+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1811-5+, 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 DS1811-5+ part is unused and in its original packaging.
Return procedure for DS1811-5+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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