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Analog Devices Inc./Maxim Integrated DS1814BR-10-U+
- Part No.:
- DS1814BR-10-U+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS1814BR-10-U+.pdf
- Description:
- 5 VOLT AND 3.3 VOLT MICROMONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,252
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Product details
Overview
DS1814BR-10-U+ from Maxim Integrated is a 5V microprocessor supervisory circuit with reset generation, watchdog timer, and pushbutton reset control in SOT-23-5 package. It monitors VCC (trip point 4.25–4.50 V), provides 140–280 ms active-low reset pulse, and features 1.12 s watchdog timeout. Used in embedded systems requiring reliable power-up sequencing and fault recovery during brownouts or software hangs.
For engineers reviewing the DS1814BR-10-U+ datasheet, DS1814BR-10-U+ pinout, DS1814BR-10-U+ application, or DS1814BR-10-U+ equivalent, key selection criteria include VCC trip tolerance (±10%), industrial temperature range (−40°C to +85°C), SOT-23-5 footprint compatibility, and functional alignment with MAX823/24/25 for drop-in replacement in legacy designs.
Technical Context
The DS1814BR-10-U+ implements a precision voltage monitor with 10% trip tolerance at 4.25–4.50 V, internal hysteresis of 10 mV, and reset assertion down to 1.0 V VCC. Its watchdog timer requires ST input toggling every ≤1.12 s to prevent reset activation, and supports disable-by-float operation.
This 'B' variant provides one active-low RST output (Pin 1), ground (Pin 2), one active-high RST output (Pin 3), strobe input (Pin 4), and VCC (Pin 5). It lacks PBRST functionality-distinguishing it from 'A' and 'C' versions-and is optimized for systems needing dual-polarity reset signaling without pushbutton support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.25–4.50 V - triggers reset when supply falls below this window; matches 5V systems with ±10% tolerance. |
| Reset Pulse Width | 140–280 ms - ensures sufficient hold time for microprocessor stabilization after power recovery or watchdog timeout. |
| Watchdog Timeout | 1.12–2.40 s - defines maximum allowable software stall before forced reset; configurable via ST input timing. |
| Operating Current | 10–15 µA - ultra-low quiescent draw enables use in battery-backed or always-on monitoring applications. |
| Output Drive | 350 µA high-level / 3.2–6 mA low-level - sufficient to directly drive CMOS/TTL reset inputs without external buffers. |
| Temperature Range | −40°C to +85°C - qualified for industrial environments including factory automation and remote telemetry nodes. |
| VCC Operating Range | 1.0–5.5 V - supports valid reset assertion during deep brownout (down to 1.0 V) and full 5V operation. |
Pinout & Package
SOT-23-5 surface-mount package (9 mm² footprint, 1.3 mm height); RoHS-compliant, lead-free (U+ suffix); mechanical drawing 21-0057F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST (active-low) | Open-drain or push-pull reset output asserted low during power failure, watchdog timeout, or power-up. |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O; must be low-impedance connection. |
| 3 | RST (active-high) | Complementary active-high reset output synchronized with Pin 1; enables direct interface to mixed-logic systems. |
| 4 | ST (strobe) | Watchdog input requiring edge transition every ≤1.12 s; floating disables watchdog function. |
| 5 | VCC | Primary power supply input; also monitored for undervoltage detection; operates from 1.0 V to 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high RST signals eliminate need for external inverters in logic-level translation. |
| Watchdog timer with disable-by-float | ST pin left unconnected disables watchdog entirely-no pull-up/down required-simplifying design flexibility. |
| 1.0 V minimum VCC operation | Ensures valid reset assertion during deep brownout conditions where VCC drops below 1.5 V. |
| 10 mV hysteresis on trip point | Prevents reset chatter near threshold by enforcing clean, noise-immune release after recovery. |
| Industrial temperature qualification | Validated across −40°C to +85°C, enabling deployment in uncontrolled ambient environments like motor drives or outdoor gateways. |
Applications
| Industrial PLC Controller | Smart Metering Endpoint |
|---|---|
|
Use Scenario: Microcontroller in programmable logic controller experiences voltage sag during relay switching or EMI events. IC Role / Device Role / Timing Role: DS1814BR-10-U+ monitors 5V rail and asserts both RST and RST within 40 µs of VCC drop below 4.25 V, holding reset for ≥140 ms post-recovery. Use Value: Prevents corrupted register writes or inconsistent state machine transitions during transient faults, ensuring deterministic restart. |
Use Scenario: Battery-backed metrology SoC in electricity meter must survive grid brownouts and maintain secure boot integrity. IC Role / Device Role / Timing Role: DS1814BR-10-U+ serves as primary power supervisor and watchdog, using ST input tied to UART TX line to detect firmware hang. Use Value: Guarantees automatic recovery from frozen firmware without manual intervention, preserving tamper-evident logging continuity. |
| Medical Diagnostic Sensor Hub | Automotive Body Control Module |
|
Use Scenario: Low-power ARM Cortex-M4 in portable ultrasound sensor hub enters deep sleep but must wake reliably after power interruption. IC Role / Device Role / Timing Role: DS1814BR-10-U+ provides precise 4.375 V trip point and 140 ms reset hold time aligned with processor's minimum power-up stabilization requirement. Use Value: Eliminates need for discrete RC reset circuits and reduces BOM count while meeting IEC 60601-1 immunity requirements. |
Use Scenario: CAN-enabled BCM experiences load dump transients causing temporary 5V rail collapse during alternator regulation events. IC Role / Device Role / Timing Role: DS1814BR-10-U+ detects sub-4.25 V condition and asserts RST/RST to halt MCU execution until rail recovers and stabilizes for ≥140 ms. Use Value: Avoids undefined MCU behavior during transient overvoltage recovery, supporting ISO 7637-2 compliance without additional TVS coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SEUR+T | Same SOT-23-5 package; 4.63 V trip point (±2.5%); no active-high RST output; only active-low RST. | Lacks dual-polarity reset; requires external inverter if active-high signal needed; tighter trip accuracy but less margin for aging. | Select when single-reset polarity suffices and higher trip-point precision is prioritized over flexibility. |
| TPS3808G12DBVR | Adjustable trip via external resistor divider; 1.2 V to 5.5 V VCC range; 200 ms reset timeout; no watchdog or strobe input. | No built-in watchdog timer; requires external timing components for system-level hang detection; greater design effort for fault coverage. | Select when adjustable threshold is mandatory and watchdog functionality is implemented separately in firmware or FPGA. |
Compared with MAX823SEUR+T and TPS3808G12DBVR, the DS1814BR-10-U+ uniquely delivers dual-polarity reset outputs and integrated watchdog in a fixed-threshold, low-component-count solution-ideal for cost-sensitive industrial controllers where layout space and firmware overhead are constrained.
Availability
DS1814BR-10-U+ is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering endpoints, medical sensor hubs, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for DS1814BR-10-U+ 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, communications, and computing applications.
The DS1814BR-10-U+ belongs to the MicroMonitor™ supervisory product line, engineered specifically for robust microprocessor reset and watchdog functions in harsh, real-world power environments.
FAQ
What is the exact VCC trip point range for DS1814BR-10-U+?
The DS1814BR-10-U+ has a guaranteed VCC trip point range of 4.25 V to 4.50 V, corresponding to its "-10" designation indicating ±10% tolerance around a nominal 4.375 V threshold. This is validated across −40°C to +85°C and applies to both power-up and power-down detection events. The DS1814BR-10-U+ uses an internal temperature-compensated reference to maintain stability across operating conditions.
Does DS1814BR-10-U+ support pushbutton reset functionality?
No, the DS1814BR-10-U+ does not support pushbutton reset. As a 'B' variant, it omits the PBRST pin and associated debounce logic found in 'A' and 'C' versions. Its Pin 3 is RST (active-high), not PBRST. Pushbutton reset capability is exclusive to DS1814AR-10-U+ and DS1814CR-10-U+ variants per the official pin assignment table.
Can DS1814BR-10-U+ operate below 1.0 V VCC?
No-the DS1814BR-10-U+ guarantees valid RST and RST output behavior down to 1.0 V VCC only. Below 1.0 V, the internal comparator and output drivers cease reliable operation. However, a 100 kΩ pull-down resistor from RST to GND (as documented in Figure 9) extends valid reset assertion down to 0 V VCC, though at the cost of static current draw during high-state periods.
Is DS1814BR-10-U+ pin-compatible with MAX823 series devices?
Yes-the DS1814BR-10-U+ is explicitly stated as pin- and function-compatible with MAX823/24/25 products. All share identical SOT-23-5 pinout (RST, GND, RST, ST, VCC), same electrical timing (140 ms reset pulse, 1.12 s watchdog timeout), and compatible voltage thresholds for direct substitution in existing layouts without PCB modification.
What is the watchdog strobe (ST) input requirement for DS1814BR-10-U+?
The ST input of DS1814BR-10-U+ requires a logic-level transition (high-to-low or low-to-high) at least once every 1.12 seconds to prevent watchdog timeout. The input draws only −20 to −15 µA when held low and 120–160 µA when held high (time-averaged), and may be left floating to permanently disable the watchdog function-no external pull-up or pull-down is needed.
DS1814BR-10-U+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- -
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
DS1814BR-10-U+ FAQ
1.How can I place an order for DS1814BR-10-U+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1814BR-10-U+ 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 DS1814BR-10-U+ reliable?
The price and inventory of DS1814BR-10-U+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1814BR-10-U+ is usually 5 days.
3.What payment methods are accepted for DS1814BR-10-U+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1814BR-10-U+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1814BR-10-U+?
DS1814BR-10-U+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1814BR-10-U+ 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 DS1814BR-10-U+?
For technical support, including DS1814BR-10-U+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1814BR-10-U+ requirements.
6.How does Aetrix verify that DS1814BR-10-U+ is sourced from the original manufacturer or authorized distributors?
All DS1814BR-10-U+ 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 DS1814BR-10-U+ meets industry standards.
7.What is the process for return or replacement of DS1814BR-10-U+?
All DS1814BR-10-U+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1814BR-10-U+, 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 DS1814BR-10-U+ part is unused and in its original packaging.
Return procedure for DS1814BR-10-U+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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