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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:2,319
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Product details
Overview
DS1815R-20/T&R from Maxim Integrated (now Analog Devices) 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 after VCC recovery, 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% undervoltage threshold accuracy, operating current under 35µA, and compatibility with 1.2V–5.5V supply rails.
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 an active-low RST signal on power-down and holds it active for 100–250ms (typ. 150ms) after VCC returns within specification.
It features CMOS push-pull output capable of sourcing 350µA at 2.4V and sinking 10mA at 0.4V, with output capacitance limited to 10pF. The device requires no external components and supports operation down to 0V VCC during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.47V (min) to 2.64V (max); precise 20% undervoltage detection threshold for 3.3V systems |
| Reset Pulse Width | 100–250ms (typ. 150ms); ensures stable power and processor initialization before release |
| Supply Voltage Range | 1.2V to 5.5V; supports wide-rail microcontrollers and legacy 5V logic |
| Operating Current | 28–35µA; ultra-low quiescent consumption for battery-backed or energy-sensitive designs |
| Output Type | Push-pull CMOS; eliminates need for external pull-up resistor and enables direct MCU reset input drive |
| Temperature Range | –40°C to +85°C; qualified for industrial-grade embedded applications |
| Output Sink/Source | Sinks 10mA @ 0.4V, sources 350µA @ 2.4V; sufficient for direct interface with most reset inputs |
Pinout & Package
SOT-23-3 surface-mount package (3.0mm × 1.4mm × 1.1mm), RoHS-compliant, tape-and-reel format (T&R).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | CMOS push-pull driver; asserts low during power fault and for ≥100ms after VCC recovery |
| 2 - VCC | Power supply input | Monitored rail input; functional down to 0V during reset assertion; supports 1.2V–5.5V operation |
| 3 - GND | Ground reference | Common return for internal reference and output stage; must be low-impedance for accurate trip point |
Key Features
| Feature | Design Value |
|---|---|
| 20% VCC trip tolerance | Enables robust undervoltage detection for 3.3V systems where ±10% margin is insufficient |
| 150ms guaranteed reset hold time | Meets JEDEC JESD78 latch-up immunity timing requirements for microprocessor reset sequencing |
| Push-pull output architecture | Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs. open-drain |
| Temperature-compensated reference | Maintains trip point stability over –40°C to +85°C without calibration or trimming |
| Zero external components required | Reduces PCB area, assembly cost, and qualification effort in space-constrained embedded modules |
Applications
| Industrial PLC Controller | Smart Meter Power Supervision |
|---|---|
Use Scenario: Power interruption during firmware update or metering cycle causes brownout risk. IC Role / Device Role / Timing Role: DS1815R-20/T&R monitors 3.3V rail and forces hard reset if VCC drops below 2.47V, holding reset for 150ms post-recovery. Use Value: Prevents corrupted flash writes and ensures deterministic boot state after grid fluctuations. | Use Scenario: Utility meter operates unattended for years with intermittent AC-derived 3.3V supply. IC Role / Device Role / Timing Role: DS1815R-20/T&R acts as primary power-fail detector with 20% hysteresis and push-pull output directly driving MCU reset pin. Use Value: Guarantees clean restart without external biasing, reducing field failure rate from supply transients. |
| POS Terminal Boot Integrity | IoT Edge Sensor Node |
Use Scenario: Battery-backed POS terminal experiences rapid VCC sag during thermal printer activation. IC Role / Device Role / Timing Role: DS1815R-20/T&R detects 3.3V rail collapse below 2.64V and asserts RST until stable for ≥100ms. Use Value: Avoids partial instruction execution and memory corruption during high-current peripheral switching. | Use Scenario: Low-power sensor node powered by energy harvesting harvests intermittent 2.5–4.2V. IC Role / Device Role / Timing Role: DS1815R-20/T&R supervises harvested rail and triggers controlled MCU reset when voltage falls below 2.47V. Use Value: Enables reliable cold-start behavior and prevents undefined state in ultra-low-quiescent systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326–29D | Fixed 2.93V trip point; 140ms min reset timeout; open-drain output requiring pull-up | Better suited for 3.3V systems needing tighter trip accuracy but less tolerant of rail variation | Select when 2.93V threshold and open-drain interface match existing design constraints |
| TPS3808G12DBVR | Adjustable trip via external resistor; 200ms fixed timeout; push-pull output; higher ICC (1.3µA typ) | Offers programmability and lower supply current but requires external component and larger footprint | Choose when system-level flexibility justifies added BOM complexity and layout area |
Compared with MAX6326–29D and TPS3808G12DBVR, the DS1815R-20/T&R delivers fixed 20% trip tolerance with zero external components and minimal board space-ideal for cost-sensitive, high-volume industrial controls where 2.47V–2.64V detection suffices.
Availability
DS1815R-20/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter power supervision, POS terminal boot integrity, and IoT edge sensor nodes 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
Analog Devices (via acquisition of Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The DS1815R-20/T&R belongs to Maxim's EconoReset family-designed specifically for cost-effective, single-supply voltage monitoring and microprocessor reset generation in space- and power-constrained embedded systems.
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) at –40°C to +85°C, corresponding to its 20% tolerance rating for nominal 3.3V systems. This range is specified in the DC Electrical Characteristics table and validated across temperature and supply variations. The DS1815R-20/T&R uses an internal temperature-compensated reference to maintain this window without external calibration.
Does DS1815R-20/T&R require an external pull-up resistor on the RST pin?
No, the DS1815R-20/T&R features a CMOS push-pull output that actively drives both high and low states, eliminating the need for an external pull-up resistor. Its RST pin can directly interface with standard microcontroller reset inputs. This design reduces BOM count and improves noise immunity compared to open-drain alternatives. The DS1815R-20/T&R specifications confirm VOH = VCC – 0.1V and IOL = +10mA, confirming full drive capability.
What is the minimum supply voltage at which DS1815R-20/T&R remains functional?
The DS1815R-20/T&R operates with VCC as low as 1.2V and maintains valid RST assertion down to 0V VCC, as confirmed in the "RST VALID TO 0 VOLTS VCC" application diagram. Its internal circuitry continues monitoring and asserting reset even during deep brownout. The DS1815R-20/T&R datasheet specifies functional operation from 1.2V to 5.5V, with guaranteed trip point accuracy across that range.
How long does the reset signal stay active after VCC recovers?
The DS1815R-20/T&R holds the RST signal active for 100ms to 250ms (typical 150ms) after VCC returns to within its trip threshold. This delay is internally generated and independent of external components. The timing is verified across temperature and supply voltage per the AC Electrical Characteristics table. This ensures sufficient stabilization time for both power supply and microprocessor before release-critical for DS1815R-20/T&R's role in reliable boot sequencing.
Is DS1815R-20/T&R compatible with 5V microcontroller reset inputs?
Yes, the DS1815R-20/T&R is compatible with 5V microcontroller reset inputs. Its RST output is CMOS push-pull with VOH up to VCC – 0.1V and absolute maximum RST voltage rated to +5VCC + 0.5V. When powered from a 5V rail, DS1815R-20/T&R outputs up to 4.9V high-level signal-fully compatible with standard 5V logic thresholds. Its VCC range (1.2V–5.5V) and output specs confirm safe operation in mixed-voltage systems.
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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