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Analog Devices Inc./Maxim Integrated DS1814AR-5/T&R
- Part No.:
- DS1814AR-5/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS1814AR-5/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
DS1814AR-5/T&R from Maxim Integrated is a 5V microprocessor supervisory circuit with precision power monitoring (4.50–4.75 V trip), watchdog timer (1.12 s timeout), pushbutton reset control, and active-low reset output in SOT-23-5 package. It halts and restarts out-of-control microprocessors during power transients or software hangs, and is used in industrial embedded controllers requiring reliable power-up sequencing and fail-safe reset.
For engineers reviewing the DS1814AR-5/T&R datasheet, DS1814AR-5/T&R pinout, DS1814AR-5/T&R application, or DS1814AR-5/T&R equivalent, key selection considerations include VCC trip accuracy (±5%), 140 ms minimum reset pulse width, watchdog strobe timing compatibility, and SOT-23-5 footprint constraints for space-constrained PCB layouts.
Technical Context
The DS1814AR-5/T&R implements a precision voltage monitor with 4.75 V typical trip point and 10 mV hysteresis, ensuring stable reset assertion during VCC droop and clean release on recovery. Its internal watchdog timer requires ST input toggling every 1.12 seconds to prevent timeout-induced reset activation.
This variant is the 'A' type (RST, GND, PBRST, ST, VCC pinout) with 5% tolerance, supporting both pushbutton-initiated reset (debounced, ≥140 ms pulse) and automatic power-fail detection. The push-pull RST output remains valid down to 1.0 V VCC and can be extended to 0 V with external pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50–4.75 V - triggers reset when 5V supply falls below safe operating threshold |
| Reset Pulse Width | 140–280 ms - ensures sufficient processor stabilization time after power recovery or button press |
| Watchdog Timeout | 1.12–2.40 s - forces reset if microcontroller fails to strobe ST within defined interval |
| Operating Current | 10–15 µA - enables low-power operation in battery-backed or energy-sensitive systems |
| Output Drive | 350 µA high / 3.2–6 mA low - supports direct interface to standard CMOS/TTL reset inputs |
| Temperature Range | −40°C to +85°C - validated for industrial-grade environmental reliability |
| Supply Range | 1.0–5.5 V - allows functional operation down to brown-out conditions while maintaining reset validity |
Pinout & Package
SOT-23-5 surface-mount package with 1.6 mm × 2.9 mm footprint, 0.95 mm height, and gull-wing leads. RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-Low Reset Output | Push-pull output asserted low during power failure, watchdog timeout, or pushbutton event |
| 2 - GND | Ground Reference | Primary return path for all internal circuits and reset output sink current |
| 3 - PBRST | Pushbutton Reset Input | Debounced active-low input; initiates ≥140 ms reset pulse on release |
| 4 - ST | Watchdog Strobe Input | Edge-sensitive input; must toggle ≤1.12 s to prevent watchdog timeout |
| 5 - VCC | Power Supply Input | Supplies internal reference, comparator, timer, and output driver; monitored for trip condition |
Key Features
| Feature | Design Value |
|---|---|
| 5% VCC Trip Accuracy | Ensures precise power-fail detection at 4.75 V nominal for 5V systems without external calibration |
| Integrated Watchdog Timer | Eliminates need for external RC timing components; 1.12 s timeout configurable via ST pin activity |
| Pushbutton Debounce Logic | Hardware-based filtering rejects <100 ns noise spikes and guarantees clean 140 ms reset pulse |
| 0V-Compatible Reset Output | With 100 kΩ pull-down resistor, maintains valid logic state down to 0 V VCC for full-cycle power monitoring |
| Pin- and Function-Compatible with MAX823/24/25 | Enables drop-in replacement in existing designs using those Maxim supervisory ICs without layout change |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Power interruption during firmware update or real-time data acquisition. IC Role / Device Role / Timing Role: Supervisory circuit asserting RST to halt CPU, hold memory state, and enforce safe reboot sequence. Use Value: Prevents flash corruption and RAM data loss by guaranteeing ≥140 ms reset hold time after VCC recovery. | Use Scenario: Software lockup during image processing pipeline execution. IC Role / Device Role / Timing Role: Watchdog timer monitoring ST signal from DSP core; triggers RST on missed strobe. Use Value: Restores system responsiveness without manual intervention, meeting IEC 62304 safety requirements. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Customer-activated hardware reset via front-panel button. IC Role / Device Role / Timing Role: PBRST input conditioned and timed to generate standardized 140 ms reset pulse. Use Value: Eliminates mechanical switch bounce artifacts and ensures deterministic microcontroller reset timing. | Use Scenario: Grid voltage sag causing brown-out in metering SoC. IC Role / Device Role / Timing Role: Precision VCC monitor detecting drop below 4.50 V and asserting RST before ADC/SPI failure. Use Value: Maintains accurate energy measurement integrity by preventing partial register writes during undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SESA+ | Same SOT-23-5 package; 4.63 V trip (±2.5%), no PBRST pin; ST function absent | Lacks pushbutton reset and watchdog - suitable only for basic power-monitor-only use cases | Select when only power-fail reset is required and board space precludes adding discrete debounce circuitry |
| TPS3808G15DBVR | Adjustable trip via external resistor; 1.5 V to 6.0 V range; fixed 200 ms reset delay; no ST/PBRST pins | Requires external components for pushbutton or watchdog functions; higher quiescent current (12 µA vs 10 µA) | Choose for flexible trip-point tuning in multi-rail systems where DS1814AR-5/T&R's fixed 4.75 V is unsuitable |
Compared with MAX823SESA+ and TPS3808G15DBVR, the DS1814AR-5/T&R uniquely integrates pushbutton reset, watchdog timer, and precision 5% trip in one SOT-23-5 device-reducing BOM count and enabling robust fault recovery without design compromises.
Availability
DS1814AR-5/T&R is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for DS1814AR-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, and communications markets.
The DS1814AR-5/T&R belongs to the MicroMonitor™ family of supervisory circuits engineered specifically for fail-safe microprocessor reset generation in harsh, unattended environments.
FAQ
What is the exact VCC trip voltage range for DS1814AR-5/T&R?
The DS1814AR-5/T&R has a guaranteed VCC trip point of 4.50 V minimum to 4.75 V typical, with ±5% tolerance resulting in an upper limit of 4.99 V. This specification ensures reliable reset assertion before 5V rail collapse affects microprocessor instruction fetch or memory access, and is validated across −40°C to +85°C.
Does DS1814AR-5/T&R support both active-high and active-low reset outputs?
No - the DS1814AR-5/T&R provides only an active-low reset output (RST) on Pin 1. Unlike DS1814B or DS1814C variants, it does not include an active-high RST output. Its 'A' configuration features RST, GND, PBRST, ST, and VCC pins - making it ideal for systems requiring single-polarity reset signaling with integrated watchdog and pushbutton functions.
Can the watchdog timer in DS1814AR-5/T&R be disabled, and how?
Yes - the watchdog timer in DS1814AR-5/T&R is disabled by leaving the ST pin (Pin 4) floating or tri-stated. No external pull-up or pull-down is required. When ST is inactive, the internal timer stops counting, and reset assertion occurs only due to VCC dropout or PBRST activation. This behavior is explicitly confirmed in the DS1814/DS1819 datasheet Section "Watchdog Timer".
What is the minimum reset pulse width generated by DS1814AR-5/T&R?
The DS1814AR-5/T&R guarantees a minimum reset pulse width of 140 ms for all reset sources: power-up, power-down, watchdog timeout, and pushbutton release. This duration is factory-tested and specified across temperature and voltage ranges, ensuring sufficient time for microprocessor core, PLL, and memory subsystems to achieve stable operation before release.
Is DS1814AR-5/T&R compatible with 3.3V microcontrollers?
No - the DS1814AR-5/T&R is a 5V-specific supervisory device with a 4.50–4.75 V trip point and rated for VCC = 1.0–5.5 V operation. For 3.3V systems, the DS1819AR-5/T&R (3.00–3.15 V trip) is the functionally identical counterpart. Using DS1814AR-5/T&R on a 3.3V rail would prevent reset assertion during brown-out, compromising system reliability.
DS1814AR-5/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
DS1814AR-5/T&R FAQ
1.How can I place an order for DS1814AR-5/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1814AR-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 DS1814AR-5/T&R reliable?
The price and inventory of DS1814AR-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 DS1814AR-5/T&R is usually 5 days.
3.What payment methods are accepted for DS1814AR-5/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1814AR-5/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1814AR-5/T&R?
DS1814AR-5/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1814AR-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 DS1814AR-5/T&R?
For technical support, including DS1814AR-5/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1814AR-5/T&R requirements.
6.How does Aetrix verify that DS1814AR-5/T&R is sourced from the original manufacturer or authorized distributors?
All DS1814AR-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 DS1814AR-5/T&R meets industry standards.
7.What is the process for return or replacement of DS1814AR-5/T&R?
All DS1814AR-5/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1814AR-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 DS1814AR-5/T&R part is unused and in its original packaging.
Return procedure for DS1814AR-5/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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