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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:3,830
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Product details
Overview
DS1816-20 from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring supervisory IC that provides active-low reset assertion during VCC undervoltage conditions in 3V systems. It features a 20% trip point tolerance (2.47V–2.64V), 150ms reset pulse width, open-drain RST output with internal 5kΩ pull-up, and operates from –40°C to +85°C in TO-92 or SOT-23 packages.
For engineers reviewing the DS1816-20 datasheet, DS1816-20 pinout, DS1816-20 application, or DS1816-20 equivalent, key selection criteria include trip point accuracy for 3V rail monitoring, guaranteed reset timing after power-up/power-down, open-drain interface compatibility with microprocessor reset inputs, and package options for space-constrained embedded designs.
Technical Context
The DS1816-20 uses an internal temperature-compensated voltage reference and comparator to detect when VCC falls below its 20% threshold (2.47V–2.64V). Upon detection, it asserts the open-drain RST pin low; the reset remains active for ≥100ms and ≤250ms-typically 150ms-after VCC returns to tolerance.
Its design integrates a precision reference, comparator, delay timer, and open-drain driver in a single die. The internal 5kΩ pull-up resistor eliminates external components in many applications, while the 28µA typical supply current supports low-power system monitoring without burdening the VCC rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.47V–2.64V (20% tolerance for 3V systems; ensures reliable reset assertion before brownout) |
| Reset Pulse Width | 100–250ms (typ. 150ms; guarantees microprocessor stabilization post-power recovery) |
| Output Type | Open-drain RST with internal 3.5–7.5kΩ pull-up (enables wired-OR reset buses and flexible logic-level interfacing) |
| Supply Current | 28–35µA (ultra-low quiescent draw; minimizes impact on battery or low-power VCC rails) |
| Operating Temp | –40°C to +85°C (supports industrial-grade embedded control and automotive under-hood environments) |
| Output Drive | 10mA sink capability at 0.4V (ensures robust reset signal integrity into heavy capacitive loads) |
Pinout & Package
DS1816-20 is available in TO-92 (3-pin plastic through-hole) and SOT-23 (3-pin surface-mount) packages. Both share identical pin functions and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TO-92) / 1 (SOT-23) | RST | Active-low open-drain reset output; requires external pull-up only if load exceeds internal 5kΩ pull-up capability |
| 2 (TO-92) / 2 (SOT-23) | VCC | Power supply input (0.0–5.5V); powers internal reference, comparator, and timing circuitry |
| 3 (TO-92) / 3 (SOT-23) | GND | Ground reference for all internal circuits and reset threshold measurement |
Key Features
| Feature | Design Value |
|---|---|
| Precision 20% VCC monitoring | Guaranteed trip window of 2.47V–2.64V enables stable operation in 3V systems with wide supply variation |
| 150ms reset hold time | Ensures microprocessor clocks, PLLs, and memory controllers fully stabilize before release |
| Integrated 5kΩ pull-up resistor | Eliminates need for external pull-up in most MCU reset circuits, reducing BOM count and PCB area |
| Temperature-compensated reference | Maintains trip point accuracy across –40°C to +85°C without calibration or trimming |
Applications
| Industrial PLC I/O Module | Medical Portable Monitor |
|---|---|
Use Scenario: Power rail monitoring in DIN-rail mounted programmable logic controller modules with 3.3V logic supplies. IC Role / Device Role / Timing Role: Supervisory IC generating system-wide reset upon 3V rail sag during transient load switching or backup battery switchover. Use Value: Prevents firmware corruption by enforcing 150ms minimum reset hold time after VCC recovery, ensuring deterministic boot sequence. | Use Scenario: Battery-powered handheld vital signs monitor requiring reliable cold-start and brownout recovery. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M0+ MCU during Li-ion battery discharge below 3.0V. Use Value: 2.47V–2.64V trip range aligns with 3V system brownout margin; 28µA ICC extends battery runtime between calibrations. |
| Automotive Body Control Unit | Smart Energy Meter |
Use Scenario: Reset supervision for microcontroller in 12V-to-3.3V converted subsystems (e.g., door module, lighting ECU). IC Role / Device Role / Timing Role: Detects undervoltage on regulated 3.3V rail caused by alternator dropout or load dump transients. Use Value: –40°C to +85°C rating meets AEC-Q100 ambient requirements; open-drain RST interfaces directly with automotive-grade MCUs. | Use Scenario: Tamper-resistant electricity meter with isolated power domains and dual-supply MCU. IC Role / Device Role / Timing Role: Monitors auxiliary 3V supply powering real-time clock and secure crypto coprocessor. Use Value: Internal 5kΩ pull-up simplifies layout in high-isolation designs; 10mA sink drive ensures noise-immune reset signaling over long traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB26DPWR | Fixed 2.63V trip point (±1%), 200ms reset timeout, push-pull output, no internal pull-up | Requires external pull-up for open-drain bus use; tighter trip tolerance suits precision 3.3V rails | Choose when exact 2.63V threshold and push-pull drive are required; verify MCU reset pin compatibility |
| MAX6326UR26+T | 2.63V trip (±1.5%), 140ms min reset pulse, open-drain output, 1.6µA max ICC | Ultra-low ICC ideal for battery-backed RTCs; same 200mV hysteresis as DS1816-20 | Prefer for energy-critical applications where <2µA quiescent current outweighs DS1816-20's cost advantage |
Compared with TLV803EB26DPWR and MAX6326UR26+T, the DS1816-20 offers lower system cost via integrated pull-up and broader trip tolerance optimized for legacy 3V designs, while trading off precision and ultra-low ICC for robustness in industrial temperature ranges and ease of integration.
Availability
DS1816-20 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, automotive body control units, and smart energy meters requiring stable component supply and long-term lifecycle support.
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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The DS1816-20 belongs to the EconoReset™ family of supervisory ICs engineered for cost-sensitive, high-volume embedded systems requiring reliable power-on reset and brownout protection without external timing components.
FAQ
What is the exact VCC trip point range for DS1816-20?
The DS1816-20 has a guaranteed VCC trip point range of 2.47V to 2.64V at –40°C to +85°C, corresponding to a 20% tolerance centered on a nominal 3V supply. This range is specified in the DC Electrical Characteristics table and validated across temperature and process corners-not derived or interpolated.
Does DS1816-20 require an external pull-up resistor on the RST pin?
The DS1816-20 includes an internal pull-up resistor of 3.5kΩ to 7.5kΩ, making an external pull-up unnecessary in most standard microprocessor reset applications. However, if the RST net has high capacitance (>100pF) or drives multiple inputs, a 1kΩ external pull-up may be needed per Note 3 in the datasheet to ensure fast rise time and noise immunity.
Can DS1816-20 be used with a 5V microcontroller supply rail?
No-DS1816-20 is specifically designed for 3V systems and its 2.47V–2.64V trip point is inappropriate for monitoring 5V rails. For 5V applications, consider DS1816-5 (2.98V–3.15V trip) or DS1816-10 (2.80V–2.97V trip). Using DS1816-20 on 5V would result in permanent reset assertion.
What is the maximum sink current capability of the DS1816-20 RST output?
The DS1816-20 RST output can sink up to 10mA while maintaining a voltage ≤0.4V, as specified in the DC Electrical Characteristics table under "Output Current @ 0.4V". This ensures reliable logic-low signaling even into moderately capacitive or multi-load reset buses.
Is DS1816-20 qualified for automotive applications?
While DS1816-20 operates across –40°C to +85°C-the temperature range required for many automotive cabin applications-it is not AEC-Q100 qualified. For automotive-grade deployment, designers should verify qualification status with Analog Devices and consider alternatives like MAX6326UR26+T, which carries AEC-Q100 Grade 2 certification.
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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