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Analog Devices Inc./Maxim Integrated DS1818-5
- Part No.:
- DS1818-5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
DS1818-5.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,757
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Product details
Overview
DS1818-5 from Maxim Integrated is a 3.3V fixed-threshold supervisory IC with active-low open-drain reset output, temperature-compensated voltage monitoring, 150ms reset timeout, and pushbutton reset support-used in microprocessor power-fail detection and stabilization in embedded control systems.
For engineers reviewing the DS1818-5 datasheet, DS1818-5 pinout, DS1818-5 application, or DS1818-5 equivalent, key selection factors include its 2.98–3.15V trip point, -40°C to +85°C operation, 35µA max quiescent current, internal 5.5kΩ pullup, and dual-mode reset (power-up and manual pushbutton) behavior.
Technical Context
The DS1818-5 integrates a precision temperature-compensated voltage reference and comparator to detect VCC deviations from its 3.3V nominal supply. It asserts RST low on out-of-tolerance conditions and holds reset for 150ms after VCC recovery to ensure processor stabilization.
It supports two independent reset triggers: power-supply monitoring (with 2–5µs detection delay) and external pushbutton input (requiring ≥1µs low pulse), both generating a guaranteed 100–250ms active-low reset pulse via open-drain output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.98V to 3.15V - precise 3.3V supply monitoring with ±5% tolerance |
| Reset Timeout | 100–250ms - ensures stable microprocessor boot after power recovery |
| Quiescent Current | ≤35µA - enables low-power battery-backed or always-on monitoring |
| Operating Temp | -40°C to +85°C - suitable for industrial and commercial embedded environments |
| Output Type | Active-low open-drain - allows wired-OR configuration and flexible pullup selection |
| Internal Pullup | 3.5–7.5kΩ - eliminates external resistor in many applications, saving board space |
| Pushbutton Response | Detects ≥1µs low pulse - supports momentary switch integration without debounce circuitry |
Pinout & Package
DS1818-5 is available in TO-92 and SOT-23 packages, both with identical 3-pin assignment and functional pin mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low reset output | Open-drain signal asserted low during power failure or pushbutton event; requires external or internal pullup |
| VCC | Power supply input | Accepts 1.0V to 5.5V; powers internal reference, comparator, and timing circuitry |
| GND | Ground reference | Return path for all internal circuits; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-compensated trip point | Maintains ±5% accuracy across -40°C to +85°C, eliminating thermal drift-induced false resets |
| 150ms reset hold time | Guarantees microprocessor core and peripherals stabilize before release, preventing boot failures |
| Integrated 5.5kΩ pullup resistor | Reduces BOM count and PCB footprint; compatible with standard 3.3V logic interfaces |
| Pushbutton reset detection | Supports user-initiated reset without additional logic or RC timing components |
| Low 35µA operating current | Enables use in energy-constrained systems such as battery-powered IoT edge nodes |
Applications
| Industrial PLC Controller | Smart Metering System |
|---|---|
Use Scenario: Power interruption during firmware update or data logging in factory-floor controllers. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail warning and controlled reset sequencing. Use Value: Prevents EEPROM corruption and state-machine lockup by holding reset until VCC stabilizes post-recovery. | Use Scenario: Mains power loss or brownout in utility meter with backup supercapacitor. IC Role / Device Role / Timing Role: Voltage monitor triggering safe shutdown and nonvolatile memory save before reset. Use Value: Ensures accurate energy accumulation and tamper-proof data retention during transient supply events. |
| Embedded HMI Panel | Networked Sensor Gateway |
Use Scenario: Cold start or unexpected AC dropout in touch-based operator interface units. IC Role / Device Role / Timing Role: Reset generator enforcing minimum 150ms power-on reset duration. Use Value: Eliminates display flicker and GUI initialization crashes caused by premature CPU release. | Use Scenario: Intermittent power in remote environmental sensor hubs powered by solar + Li-ion. IC Role / Device Role / Timing Role: Dual-trigger supervisor (VCC drop + manual reset) for field maintenance access. Use Value: Enables technician-initiated reboot via front-panel button without requiring host MCU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326TUT46+T | 4.63V fixed threshold; 200ms reset timeout; no pushbutton support | Designed for higher-voltage 5V systems; lacks manual reset capability | Choose when only power-monitoring (no pushbutton) is needed at 4.63V threshold |
| TPS3808G12DBVR | 1.225V adjustable threshold via external resistor; 200ms timeout; no integrated pushbutton logic | Requires external components for threshold setting; supports wider VCC range (up to 6V) | Prefer when programmable trip point and extended supply range outweigh simplicity of DS1818-5 |
Compared with MAX6326TUT46+T and TPS3808G12DBVR, the DS1818-5 uniquely combines fixed 3.3V supervision, built-in pushbutton handling, and internal pullup in a 3-pin package-reducing design complexity for cost-sensitive industrial microcontroller applications.
Availability
DS1818-5 is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering systems, embedded HMI panels, and networked sensor gateways requiring stable component supply and long-term lifecycle support.
Supply support for DS1818-5 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 DS1818-5 belongs to Maxim's EconoReset™ family of supervisory ICs, engineered for reliable, low-cost power monitoring and reset generation in resource-constrained embedded systems.
FAQ
What is the exact VCC trip point range for DS1818-5?
The DS1818-5 has a guaranteed VCC trip point range of 2.98V to 3.15V at -40°C to +85°C, corresponding to a nominal 3.3V supply with ±5% tolerance. This specification is tested and guaranteed per the datasheet's DC Electrical Characteristics table, and applies specifically to the DS1818-5 variant-not other DS1818 tolerances (e.g., DS1818-10 or DS1818-20).
Does DS1818-5 require an external pullup resistor on the RST pin?
No, DS1818-5 includes an internal pullup resistor ranging from 3.5kΩ to 7.5kΩ, enabling direct connection to 3.3V logic without external components. However, if driving heavier loads or interfacing with higher-voltage systems, an external pullup may still be used-though the DS1818-5 itself functions correctly with its internal resistor in standard applications.
How does the pushbutton reset function work on DS1818-5?
The DS1818-5 monitors the RST pin for external low pulses: pulling RST low for ≥1µs triggers a manual reset, and the DS1818-5 holds RST active low for 100–250ms after release. This eliminates need for external debounce circuitry and allows simple momentary switch integration directly on the reset line.
What is the maximum supply voltage the DS1818-5 can tolerate?
The DS1818-5 supports VCC from 1.0V to 5.5V under recommended operating conditions. Its absolute maximum rating is +7.0V on the VCC pin relative to GND, but operation above 5.5V is not guaranteed and may impact reliability or parametric performance-always operate DS1818-5 within the 1.0V–5.5V range for full specification compliance.
Is DS1818-5 pin-compatible with other DS1818 variants like DS1818-10 or DS1818-20?
Yes, all DS1818 variants-including DS1818-5, DS1818-10, and DS1818-20-share identical pinout, package options (TO-92/SOT-23), and electrical interface. The only difference is the VCC trip point: DS1818-5 is 3.3V ±5%, DS1818-10 is 3.3V ±10%, and DS1818-20 is 3.3V ±20%. No PCB changes are required when substituting between them.
DS1818-5 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- 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
DS1818-5 FAQ
1.How can I place an order for DS1818-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1818-5 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 DS1818-5 reliable?
The price and inventory of DS1818-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1818-5 is usually 5 days.
3.What payment methods are accepted for DS1818-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1818-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1818-5?
DS1818-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1818-5 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 DS1818-5?
For technical support, including DS1818-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1818-5 requirements.
6.How does Aetrix verify that DS1818-5 is sourced from the original manufacturer or authorized distributors?
All DS1818-5 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 DS1818-5 meets industry standards.
7.What is the process for return or replacement of DS1818-5?
All DS1818-5 units undergo pre-shipment inspection (PSI). If there is an issue with DS1818-5, 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 DS1818-5 part is unused and in its original packaging.
Return procedure for DS1818-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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