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Analog Devices Inc./Maxim Integrated DS1815R-20+T&R
- Part No.:
- DS1815R-20+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DS1815R-20+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,273
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Product details
Overview
DS1815R-20+T&R from Maxim Integrated is a precision voltage-monitoring reset IC with push-pull output, designed to automatically restart microprocessors after power failure. It provides 20% VCC trip point tolerance (2.47V–2.64V), guarantees 150ms reset pulse width, and operates across –40°C to +85°C in SOT-23 package for embedded power supervision.
For engineers reviewing the DS1815R-20+T&R datasheet, DS1815R-20+T&R pinout, DS1815R-20+T&R application, or DS1815R-20+T&R equivalent, key selection criteria include guaranteed reset timeout, push-pull drive capability, 20% supply threshold accuracy, and SOT-23 footprint compatibility with space-constrained industrial control and battery-backed systems.
Technical Context
The DS1815R-20+T&R integrates a temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions. Its internal circuitry asserts RST low on power failure and holds it active for 100–250ms after VCC recovery, ensuring stable processor boot.
It features CMOS push-pull output capable of sourcing 350µA at 2.4V and sinking 10mA at 0.4V, with quiescent current as low as 28µA. The device monitors VCC from 1.2V to 5.5V and supports operation down to 0V on RST during brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.47V (min) to 2.64V (max); precise 20% under nominal 3.3V supply for reliable brownout detection |
| Reset Pulse Width | 100–250ms; ensures sufficient stabilization time for microprocessor and power rails post-recovery |
| Output Type | Push-pull CMOS; eliminates need for external pull-up resistor and enables direct interface with logic inputs |
| Supply Range | 1.2V to 5.5V; supports wide-input operation including 3.3V and 5V systems |
| Quiescent Current | 28–35µA; enables ultra-low-power supervision in battery-critical applications |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded environments |
| RST Sink/Source | Sinks 10mA / sources 350µA; drives standard CMOS/TTL loads without buffering |
Pinout & Package
SOT-23 surface-mount package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, tape-and-reel delivery (T&R).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-Low Reset Output | CMOS push-pull output asserted low during power fault or startup; valid down to 0V VCC |
| 2 (VCC) | Power Supply Input | Monitored supply rail input; supports 1.2V–5.5V operation with internal reference tracking |
| 3 (GND) | Ground Reference | Common return path for internal comparator and output stage; requires low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| 20% VCC Threshold Accuracy | Guaranteed trip window (2.47V–2.64V) enables robust detection of 3.3V supply sag without false triggering |
| 150ms Minimum Reset Hold Time | Ensures microprocessor and peripheral clocks stabilize before release - no external timing components needed |
| Push-Pull Output Architecture | Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
| Temperature-Compensated Reference | Maintains trip point stability over –40°C to +85°C, critical for unregulated industrial power rails |
| Low 28µA Quiescent Current | Extends battery life in always-on supervisory circuits; suitable for backup power domains |
Applications
| Industrial PLC I/O Modules | Smart Meter Power Supervision |
|---|---|
Use Scenario: PLC modules operate in noisy factory environments with fluctuating 24V-derived 3.3V rails subject to transient dips. IC Role / Device Role / Timing Role: DS1815R-20+T&R continuously monitors the 3.3V domain and forces controlled microcontroller reset on undervoltage events. Use Value: Prevents firmware lockup during line transients by guaranteeing ≥100ms reset assertion, aligning with IEC 61000-4-4 immunity requirements. | Use Scenario: Smart meters require fail-safe reset during battery switchover or AC loss to preserve metering integrity and EEPROM data. IC Role / Device Role / Timing Role: DS1815R-20+T&R acts as primary power-fail detector, asserting RST before VCC falls below 2.47V and holding reset for 150ms post-recovery. Use Value: Enables deterministic state recovery and prevents partial writes to flash/EEPROM during brownout transitions. |
| Medical Sensor Nodes | IoT Edge Gateway Controllers |
Use Scenario: Portable medical sensors use coin-cell batteries where supply voltage decays gradually toward end-of-life. IC Role / Device Role / Timing Role: DS1815R-20+T&R triggers reset when VCC drops below 2.64V, ensuring clean shutdown before analog front-end or ADC performance degrades. Use Value: Avoids corrupted sensor readings by enforcing early, predictable reset rather than erratic behavior near cutoff. | Use Scenario: Gateways manage multiple wireless radios (Wi-Fi, BLE, Zigbee) with bursty power demands causing localized 3.3V rail droop. IC Role / Device Role / Timing Role: DS1815R-20+T&R supervises the main 3.3V domain feeding SoC and radio PMICs, asserting reset if droop exceeds 20%. Use Value: Maintains system-level reliability by preventing radio hang or packet loss due to marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 3.08V fixed threshold (±2.5%), 140ms min reset pulse, open-drain output | Requires external pull-up; less tolerant of slow VCC ramp rates | Choose when 3.08V threshold better matches 3.3V rail margin and board already includes pull-up |
| TPS3808G12DBVR | 1.2V adjustable threshold via external resistor, 200ms default delay, push-pull output | Configurable trip point but adds component count and layout sensitivity | Prefer when system requires fine-tuned voltage detection below 2.47V or needs programmable delay |
Compared with MAX809TRD2+T and TPS3808G12DBVR, the DS1815R-20+T&R delivers fixed 20% tolerance optimized for 3.3V rails, integrated push-pull drive, and minimal external dependencies - making it ideal for cost-sensitive, space-constrained designs requiring proven brownout resilience without configuration overhead.
Availability
DS1815R-20+T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, and portable medical devices requiring stable component supply and long-term manufacturability.
Supply support for DS1815R-20+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 and mixed-signal ICs for power management, sensing, and communication applications.
The DS1815R-20+T&R belongs to the EconoReset™ family, engineered for low-cost, high-reliability power-supply monitoring in resource-constrained embedded systems where simplicity and proven reset timing are critical.
FAQ
What is the exact VCC trip point range for DS1815R-20+T&R?
The DS1815R-20+T&R has a guaranteed VCC trip point range of 2.47V (minimum) to 2.64V (maximum), corresponding to 20% tolerance below a nominal 3.3V supply. This specification is tested and validated across –40°C to +85°C and is derived from the device's internal temperature-compensated voltage reference and comparator architecture.
Does DS1815R-20+T&R require an external pull-up resistor on the RST pin?
No, DS1815R-20+T&R does not require an external pull-up resistor because it features a CMOS push-pull output stage. The RST pin actively drives high or low, enabling direct connection to microcontroller reset inputs without additional components - a key differentiator from open-drain reset ICs like the MAX809 series.
What is the minimum reset pulse width guaranteed by DS1815R-20+T&R?
The DS1815R-20+T&R guarantees a minimum reset pulse width of 100ms, with a typical value of 150ms and maximum of 250ms. This timing is measured from VCC recovery to RST deassertion and is independent of VCC slew rate, ensuring reliable processor initialization even during slow power-rail ramp-up.
Can DS1815R-20+T&R operate with VCC below 1.2V?
No, DS1815R-20+T&R is specified for operation only within the recommended DC supply range of 1.2V to 5.5V. Below 1.2V, internal reference and comparator circuits cannot maintain functional accuracy or guaranteed timing behavior, and the device may not assert reset reliably during deep brownout conditions.
Is DS1815R-20+T&R compatible with 5V microcontrollers?
Yes, DS1815R-20+T&R supports VCC up to 5.5V and its push-pull RST output swings rail-to-rail (0V to VCC), making it fully compatible with 5V logic families. When powered from 5V, RST drives high to ~5V and low to <0.4V, meeting standard TTL/CMOS input thresholds for 5V microcontrollers.
DS1815R-20+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:
- 2.55V
- Output:
- Push-Pull, Totem Pole
- 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
DS1815R-20+T&R FAQ
1.How can I place an order for DS1815R-20+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1815R-20+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 DS1815R-20+T&R reliable?
The price and inventory of DS1815R-20+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 DS1815R-20+T&R is usually 5 days.
3.What payment methods are accepted for DS1815R-20+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1815R-20+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1815R-20+T&R?
DS1815R-20+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1815R-20+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 DS1815R-20+T&R?
For technical support, including DS1815R-20+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1815R-20+T&R requirements.
6.How does Aetrix verify that DS1815R-20+T&R is sourced from the original manufacturer or authorized distributors?
All DS1815R-20+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 DS1815R-20+T&R meets industry standards.
7.What is the process for return or replacement of DS1815R-20+T&R?
All DS1815R-20+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1815R-20+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 DS1815R-20+T&R part is unused and in its original packaging.
Return procedure for DS1815R-20+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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