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Analog Devices Inc./Maxim Integrated DS1818R-5/T&R
- Part No.:
- DS1818R-5/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DS1818R-5/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,316
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Product details
Overview
DS1818R-5/T&R from Maxim Integrated is a 3.3V fixed-threshold supervisory IC with pushbutton reset, active-low open-drain reset output, 150ms reset timeout, and 5% trip-point tolerance. It monitors VCC for power-fail detection and provides manual reset via external pushbutton in microprocessor-based systems.
For engineers reviewing the DS1818R-5/T&R datasheet, DS1818R-5/T&R pinout, DS1818R-5/T&R application, or DS1818R-5/T&R equivalent, key selection factors include its fixed 3.3V threshold (±5%), 150ms reset hold time, 35µA max quiescent current, SOT-23/TO-92 package options, and integrated 5.5kΩ internal pullup resistor.
Technical Context
The DS1818R-5/T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±5% of 3.3V (2.98V–3.15V). Its reset assertion timing is guaranteed at 100–250ms after VCC recovery or pushbutton release.
It features dual-mode operation: automatic power-monitoring reset and manual pushbutton-initiated reset, both producing identical 150ms active-low reset pulses. The open-drain RST output includes an internal 5.5kΩ pullup, eliminating external components in many designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.3V ±5% (2.98V–3.15V); ensures reliable reset activation across supply variation and temperature |
| Reset Timeout | 100–250ms; guarantees processor stabilization before release, meeting typical MCU boot requirements |
| Quiescent Current | ≤35µA; enables low-power operation in battery-backed or energy-sensitive embedded systems |
| Internal Pullup | 5.5kΩ nominal; eliminates need for external pullup resistor, reducing BOM count and PCB area |
| Operating Temp | -40°C to +85°C; supports industrial-grade deployment without derating |
| Output Type | Active-low open-drain; allows wired-OR configuration and compatibility with diverse logic families |
Pinout & Package
SOT-23-3 package: small-outline transistor-style surface-mount housing with gull-wing leads; compatible with automated assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low reset output | Open-drain signal asserted low during power fail or pushbutton event; requires external pullup only if load exceeds internal 5.5kΩ capability |
| 2 (VCC) | Power supply input | Accepts 1.0V–5.5V; powers internal reference, comparator, and timing circuitry |
| 3 (GND) | Ground reference | Return path for all internal circuits; must be connected to system ground plane for stable threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V reset threshold | Eliminates external resistor divider setup; reduces design iteration time for standard 3.3V logic domains |
| 150ms reset hold time | Guarantees sufficient delay for power rail settling and CPU clock stabilization before release |
| Integrated 5.5kΩ pullup | Reduces component count by one resistor and associated footprint; simplifies layout in compact designs |
| Pushbutton reset support | Enables field service or user-initiated reboot without additional debounce circuitry or GPIO usage |
| Temperature-compensated reference | Maintains ±5% threshold accuracy over full -40°C to +85°C range without calibration |
Applications
| Industrial PLC Controller | Medical Sensor Node |
|---|---|
Use Scenario: Power interruption during firmware update or analog sensor acquisition. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail warning and controlled reset sequencing. Use Value: Prevents corrupted flash writes and ensures clean restart after brownout, leveraging 150ms hold time and ±5% threshold stability. | Use Scenario: Battery-powered wearable device requiring manual reset for calibration recovery. IC Role / Device Role / Timing Role: Reset generator with pushbutton interface and ultra-low ICC (≤35µA). Use Value: Enables user-triggered reset without waking host MCU, using internal timing and no external passive components. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Unplanned AC dropout causing transient VCC sag on 3.3V rail. IC Role / Device Role / Timing Role: Voltage monitor asserting RST within 5µs of out-of-tolerance detection. Use Value: Ensures deterministic reset before data corruption occurs, supported by fast tRPD (2–5µs) response. | Use Scenario: Long-term deployment in outdoor meter cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade reset supervisor maintaining 3.3V threshold accuracy from -40°C to +85°C. Use Value: Delivers consistent reset behavior across environmental stress, validated by temperature-compensated reference design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT33D | Same 3.3V ±5% threshold, but uses push-pull output (not open-drain); no internal pullup | Requires external pullup for wired-OR; lacks native pushbutton reset functionality | Choose when push-pull drive strength is required and manual reset is handled elsewhere |
| TPS3808G33DBVR | 3.3V ±2% threshold, higher accuracy; 200ms reset timeout; 1.8V–6.0V VCC range | Broad VCC range supports multi-rail systems; tighter tolerance suits high-reliability applications | Choose when ±2% threshold and extended supply range outweigh added cost and complexity |
Compared with MAX6326UT33D and TPS3808G33DBVR, the DS1818R-5/T&R uniquely combines open-drain output with integrated 5.5kΩ pullup and dedicated pushbutton reset support-reducing external components and enabling simpler, lower-cost reset subsystems in 3.3V microprocessor applications.
Availability
DS1818R-5/T&R is available at Aetrix Electronics and suitable for industrial control panels, medical edge sensors, point-of-sale terminals, and smart metering systems requiring stable component supply and long-term manufacturability.
Supply support for DS1818R-5/T&R 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, communications, and computing applications.
The DS1818R-5/T&R belongs to the EconoReset™ family of supervisory ICs engineered for cost-sensitive, space-constrained microprocessor reset applications with minimal external components.
FAQ
What is the exact reset threshold voltage for DS1818R-5/T&R?
The DS1818R-5/T&R has a fixed 3.3V reset threshold with ±5% tolerance, meaning it asserts reset when VCC falls below 2.98V and releases reset when VCC rises above 3.15V. This specification is guaranteed across the full -40°C to +85°C operating temperature range and is based on internal temperature-compensated reference circuitry.
Does DS1818R-5/T&R require an external pullup resistor on the RST pin?
No, the DS1818R-5/T&R integrates a 5.5kΩ internal pullup resistor on the open-drain RST output, eliminating the need for an external component in most applications. An external pullup may be added only if higher sink current (>10mA) or faster rise time is required beyond the internal resistor's capability.
How does the pushbutton reset function work on DS1818R-5/T&R?
The DS1818R-5/T&R monitors the RST pin for external low pulses: pulling RST low for ≥1µs triggers a manual reset, and the output remains active low for 100–250ms after release. This feature enables field-service reboot without additional debounce circuitry or MCU GPIO involvement.
What package types are offered for DS1818R-5/T&R?
The DS1818R-5/T&R is supplied in SOT-23-3 package (tape-and-reel format indicated by "/T&R" suffix), featuring gull-wing surface-mount leads. A TO-92 through-hole variant exists for the same DS1818 family, but DS1818R-5/T&R specifically denotes the SOT-23-3 tape-and-reel version.
What is the maximum supply voltage the DS1818R-5/T&R can tolerate?
The DS1818R-5/T&R supports VCC from 1.0V to 5.5V per recommended operating conditions, with absolute maximum rating of +7.0V. Operation above 5.5V risks permanent damage and is outside guaranteed specifications; sustained use at 5.5V is fully supported and commonly deployed in 3.3V/5V hybrid systems.
DS1818R-5/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DS1818R-5/T&R FAQ
1.How can I place an order for DS1818R-5/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1818R-5/T&R 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 DS1818R-5/T&R reliable?
The price and inventory of DS1818R-5/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1818R-5/T&R is usually 5 days.
3.What payment methods are accepted for DS1818R-5/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1818R-5/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1818R-5/T&R?
DS1818R-5/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1818R-5/T&R 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 DS1818R-5/T&R?
For technical support, including DS1818R-5/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1818R-5/T&R requirements.
6.How does Aetrix verify that DS1818R-5/T&R is sourced from the original manufacturer or authorized distributors?
All DS1818R-5/T&R 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 DS1818R-5/T&R meets industry standards.
7.What is the process for return or replacement of DS1818R-5/T&R?
All DS1818R-5/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1818R-5/T&R, 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 DS1818R-5/T&R part is unused and in its original packaging.
Return procedure for DS1818R-5/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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