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Analog Devices Inc./Maxim Integrated DS1816-20+
- Part No.:
- DS1816-20+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
DS1816-20+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,484
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Product details
Overview
DS1816-20+ from Maxim Integrated (now Analog Devices) is a precision 3.3V supply voltage supervisor IC with open-drain active-low reset output, 20% trip point tolerance (2.47–2.64 V), 150ms reset pulse width, and internal 5kΩ pull-up resistor. It monitors VCC in microprocessor systems to ensure reliable power-on reset and brownout recovery.
For engineers reviewing the DS1816-20+ datasheet, DS1816-20+ pinout, DS1816-20+ application, or DS1816-20+ equivalent, key selection criteria include trip threshold accuracy for 3V systems, guaranteed 150ms reset hold time after VCC recovery, open-drain drive capability with internal pull-up, and TO-92/SOT-23 package compatibility with legacy and space-constrained designs.
Technical Context
The DS1816-20+ employs a temperature-compensated bandgap voltage reference and comparator to detect VCC deviations beyond ±20% of nominal 3.3V (trip range: 2.47–2.64 V). Its internal timing circuit ensures reset remains asserted for 100–250 ms after VCC returns to tolerance, with typical 150 ms.
It features an open-drain RST output capable of sinking ≥10 mA at 0.4 V, operates from 0–5.5 V supply, draws only 28–35 µA quiescent current, and supports full industrial temperature range (–40°C to +85°C) without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.47–2.64 V (±20% of 3.3V); enables robust brownout detection in 3V systems with wide supply variation |
| Reset Pulse Width | 100–250 ms (typ. 150 ms); guarantees sufficient stabilization time for microprocessors and power rails post-recovery |
| Output Type | Open-drain with internal 3.5–7.5 kΩ pull-up; simplifies interface to diverse logic families without external resistor |
| Supply Current | 28–35 µA; ultra-low power consumption suitable for battery-backed or always-on monitoring circuits |
| Operating Temp | –40°C to +85°C; validated for industrial-grade embedded control and instrumentation environments |
| Output Sink Current | ≥10 mA at 0.4 V; drives standard CMOS/TTL reset inputs directly with margin |
Pinout & Package
DS1816-20+ is available in both TO-92 and SOT-23 packages - identical pinout across variants: Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pin 3 = GND (ground reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low open-drain reset output | Asserts low during power failure or VCC undervoltage; requires no external pull-up in most applications due to internal 5kΩ resistor |
| 2 (VCC) | Positive supply input | Accepts 0–5.5 V; powers internal reference, comparator, and timing circuitry; trip threshold referenced to this rail |
| 3 (GND) | Ground reference | Provides return path for supply current and serves as voltage reference for comparator and output stage |
Key Features
| Feature | Design Value |
|---|---|
| 20% VCC trip tolerance | Enables use in 3V systems with relaxed supply regulation requirements while maintaining reliable reset assertion |
| 150ms guaranteed reset hold time | Ensures microprocessor and peripheral clocks stabilize before release, eliminating boot failures from premature exit |
| Internal 5kΩ pull-up resistor | Eliminates need for external pull-up component, reducing BOM count and PCB area in cost-sensitive designs |
| Temperature-compensated reference | Maintains trip point accuracy over –40°C to +85°C without calibration or trimming components |
| Low 35 µA operating current | Minimizes impact on system standby power budget, critical for battery-operated or energy-harvesting devices |
Applications
| Industrial PLC Controller | Smart Meter Power Monitoring |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller subjected to fluctuating 3.3V rail in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout protection to prevent firmware corruption during line sags. Use Value: ±20% trip tolerance accommodates aging DC/DC converters; 150ms reset hold ensures deterministic boot sequence after voltage recovery. | Use Scenario: Battery-backed electricity meter requiring fail-safe reset during AC mains interruption and backup battery switchover. IC Role / Device Role / Timing Role: Primary reset generator triggered by 3.3V rail collapse, asserting RST until stable VCC is re-established and held for 150ms. Use Value: Internal pull-up eliminates external resistor, reducing leakage paths and improving long-term reliability in sealed meter enclosures. |
| Medical Sensor Node | POS Terminal Power Sequencing |
Use Scenario: Portable patient monitor with ultra-low-power MCU that must retain RAM state during brief power dips but reboot cleanly if VCC drops below safe level. IC Role / Device Role / Timing Role: Precision voltage monitor detecting sub-threshold conditions and initiating controlled reset before data loss occurs. Use Value: Temperature-compensated reference ensures consistent trip point across operating temperature range, preventing false resets in clinical environments. | Use Scenario: Retail point-of-sale terminal integrating multiple peripherals (EMV reader, thermal printer, display) requiring synchronized power-up sequencing. IC Role / Device Role / Timing Role: Centralized reset supervisor coordinating processor initialization and peripheral enable timing via open-drain RST signal. Use Value: Open-drain output allows wired-OR connection with other reset sources (e.g., watchdog, manual reset button) without contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | Fixed 1.2V trip point; adjustable delay option; higher quiescent current (1.1 µA vs. 35 µA); no internal pull-up | Designed for low-voltage logic rails (e.g., core supplies), not 3.3V system monitoring | Select when precise 1.2V threshold and programmable delay are required; add external pull-up for reset interface |
| MAX6326UR26+T | 2.63V trip point (±1.5%); 140ms min reset timeout; push-pull output; no internal pull-up | Higher accuracy and tighter tolerance for 3.3V systems needing stricter brownout detection | Choose for applications demanding <2% trip accuracy and push-pull drive; requires external pull-up if interfacing to open-drain buses |
Compared with TPS3808G12DBVR and MAX6326UR26+T, the DS1816-20+ offers unique value in cost-sensitive 3V systems where ±20% trip tolerance, integrated pull-up, and minimal BOM are prioritized over ultra-tight accuracy or programmability.
Availability
DS1816-20+ is available at Aetrix Electronics and suitable for industrial control, smart metering, medical sensor nodes, and POS terminal designs requiring stable component supply and long-term manufacturability.
Supply support for DS1816-20+ 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) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, power integrity, and reliable system supervision.
The DS1816-20+ belongs to Maxim's EconoReset™ family - engineered for cost-effective, single-chip power monitoring and reset generation in resource-constrained microprocessor systems.
FAQ
What is the exact VCC trip voltage range for DS1816-20+?
The DS1816-20+ has a guaranteed VCC trip point range of 2.47 V to 2.64 V at +25°C, corresponding to ±20% of nominal 3.3V. This range is maintained across the full operating temperature range (–40°C to +85°C) due to its temperature-compensated internal reference. The DS1816-20+ datasheet specifies these limits under DC Electrical Characteristics.
Does DS1816-20+ require an external pull-up resistor on the RST pin?
No, DS1816-20+ includes an internal pull-up resistor of 3.5–7.5 kΩ, eliminating the need for an external component in most standard microprocessor reset interfaces. An external 1kΩ pull-up may be added only in cases requiring faster rise time or stronger drive - per Note 3 in the DS1816-20+ datasheet.
What is the reset timeout duration of DS1816-20+ after VCC recovery?
The DS1816-20+ holds the RST output active for 100–250 ms after VCC returns to within tolerance, with a typical value of 150 ms. This timing is internally generated and independent of external components, ensuring consistent reset hold time across units and temperatures - critical for reliable microprocessor startup.
Can DS1816-20+ operate with supply voltages below 3.3V?
Yes, DS1816-20+ operates over a VCC range of 0–5.5 V and functions correctly down to ~1.2 V per recommended conditions. However, its 2.47–2.64 V trip point means it will assert reset whenever VCC falls below that threshold - making it suitable for monitoring 3.3V rails even when powered from higher supplies (e.g., 5V) via internal regulation.
Is DS1816-20+ pin-compatible with other DS181x series parts?
Yes, all DS181x series supervisors (e.g., DS1816-5, DS1816-10, DS1816-20) share identical pinout, package options (TO-92/SOT-23), and electrical interface. Only the trip point tolerance differs: DS1816-5 = ±5%, DS1816-10 = ±10%, DS1816-20 = ±20%. The DS1816-20+ can be substituted in any DS181x footprint where 20% tolerance is acceptable.
DS1816-20+ 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:
- 2.55V
- 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
DS1816-20+ FAQ
1.How can I place an order for DS1816-20+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1816-20+ 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 DS1816-20+ reliable?
The price and inventory of DS1816-20+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1816-20+ is usually 5 days.
3.What payment methods are accepted for DS1816-20+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1816-20+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1816-20+?
DS1816-20+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1816-20+ 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 DS1816-20+?
For technical support, including DS1816-20+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1816-20+ requirements.
6.How does Aetrix verify that DS1816-20+ is sourced from the original manufacturer or authorized distributors?
All DS1816-20+ 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 DS1816-20+ meets industry standards.
7.What is the process for return or replacement of DS1816-20+?
All DS1816-20+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1816-20+, 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 DS1816-20+ part is unused and in its original packaging.
Return procedure for DS1816-20+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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