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Analog Devices Inc./Maxim Integrated DS1814BR-10/T&R
- Part No.:
- DS1814BR-10/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS1814BR-10/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
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Product details
Overview
DS1814BR-10/T&R from Maxim Integrated is a 5V microprocessor supervisory circuit with watchdog timer, pushbutton reset control, and precise 10% VCC trip point (4.25–4.50 V). It delivers active-low reset output, 140 ms minimum reset pulse width, and operates across –40°C to +85°C in SOT-23-5. Used in embedded controllers for power-fail detection and software crash recovery.
For engineers reviewing the DS1814BR-10/T&R datasheet, DS1814BR-10/T&R pinout, DS1814BR-10/T&R application, or DS1814BR-10/T&R equivalent, key selection criteria include VCC threshold accuracy, watchdog timeout (1.12 s), reset pulse duration (140–280 ms), pushbutton debounce capability, and compatibility with 5V microprocessor systems requiring reliable power-on and brownout reset behavior.
Technical Context
The DS1814BR-10/T&R implements a precision voltage monitor with 10% tolerance on a 4.5 V nominal trip point, hysteresis of 10 mV, and valid RST output down to 1.0 V VCC. Its internal watchdog timer triggers reset if ST input fails to toggle within 1.12 s, and it supports external pushbutton override via debounced PBRST input.
This variant belongs to the 'B' device type per Maxim's marking scheme (14B = DS1814B), providing active-low RST (Pin 1), GND (Pin 2), active-high RST (Pin 3), ST (Pin 4), and VCC (Pin 5). It lacks PBRST functionality but includes strobe-based watchdog supervision and dual-reset outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.25–4.50 V (10% tolerance); ensures reset assertion before 5V system brownout causes logic corruption |
| Reset Pulse Width | 140–280 ms; guarantees sufficient time for microprocessor power stabilization and register initialization |
| Watchdog Timeout | 1.12–2.40 s; detects stalled firmware execution when ST input stops toggling |
| Operating Temp | –40°C to +85°C; supports industrial-grade embedded deployment without derating |
| Supply Current | 10–15 µA; enables low-power always-on monitoring in battery-backed or energy-constrained systems |
| Output Drive | 350 µA high-level / 3.2–6 mA low-level; directly interfaces with standard CMOS/TTL reset inputs without external buffers |
| VCC Range | 1.0–5.5 V; allows operation during deep brownout and supports wide-margin power sequencing |
Pinout & Package
SOT-23-5 surface-mount package: 2.9 mm × 1.6 mm × 1.1 mm body, gull-wing leads, thermal pad optional. RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Drives microprocessor /RESET pin low during power fault, watchdog timeout, or power-up; push-pull, valid to 1.0 V VCC |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance |
| 3 - RST | Active-high reset output | Provides complementary reset signal for systems requiring active-high reset assertion or dual-signaling redundancy |
| 4 - ST | Watchdog strobe input | Edge-triggered watchdog enable; must toggle ≤1.12 s apart to prevent reset; floating disables watchdog |
| 5 - VCC | Power supply input | Supplies internal reference, comparator, timer, and output drivers; accepts 1.0–5.5 V with full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous active-low and active-high RST signals simplify interface to diverse MCU families and legacy designs |
| Watchdog timer with disable option | 1.12 s timeout enforced only when ST is actively driven; floating ST disables watchdog without hardware change |
| Valid reset down to 1.0 V VCC | Ensures deterministic reset assertion even during severe brownout-no premature release due to VCC sag |
| 10% VCC trip accuracy | Guarantees reset activation at 4.25–4.50 V for 5V systems, meeting JEDEC JESD8-12A brownout thresholds |
| Low quiescent current | 10–15 µA typical ICC enables continuous supervision in always-on subsystems without measurable battery drain |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Power interruption during real-time sensor data acquisition causes firmware lockup. IC Role / Device Role / Timing Role: Supervisory IC asserting dual RST signals to force hard reset and clear corrupted RAM/state machines. Use Value: Prevents unsafe operation by halting processor before VCC drops below 4.25 V and holding reset for ≥140 ms post-recovery. | Use Scenario: Embedded ARM core executing critical imaging algorithms stalls mid-sequence. IC Role / Device Role / Timing Role: Watchdog timer monitors ST signal from GPIO; times out after 1.12 s of inactivity to trigger fail-safe reboot. Use Value: Guarantees system self-recovery without operator intervention, satisfying IEC 62304 Class B software safety requirements. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Unstable AC-DC adapter causes repeated 5V rail dips during transaction processing. IC Role / Device Role / Timing Role: Voltage monitor detects sub-4.25 V condition and asserts RST to abort incomplete EEPROM writes. Use Value: Eliminates flash corruption risk by blocking write cycles until stable VCC is confirmed for ≥140 ms. | Use Scenario: M-Bus communication module experiences intermittent power loss in outdoor metering cabinet. IC Role / Device Role / Timing Role: Dual RST outputs coordinate reset of metrology SoC and isolated RS-485 transceiver simultaneously. Use Value: Ensures synchronized restart of coupled subsystems, avoiding handshake failures or bus contention on power restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SESA+ | Pin-compatible 5V supervisor; 4.63 V trip (±2.5%), no watchdog, single RST output | Lacks ST input and dual-RST; suitable only for basic power-monitoring-only use cases | Select when watchdog and pushbutton features are unnecessary and tighter trip tolerance is required |
| TPS3808G12DBVR | Adjustable threshold (via resistor divider); 1.2 V fixed option; 200 ms reset delay; no PBRST/ST pins | Requires external components for 5V monitoring; no integrated watchdog or manual reset logic | Choose for programmable trip points or when integrating with non-5V rails; not drop-in for DS1814BR-10/T&R |
Compared with MAX823SESA+ and TPS3808G12DBVR, the DS1814BR-10/T&R uniquely combines factory-trimmed 10% 5V monitoring, dual active-reset outputs, and a configurable watchdog in one SOT-23-5 package-enabling robust, component-minimized supervision without layout redesign.
Availability
DS1814BR-10/T&R is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, point-of-sale terminals, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for DS1814BR-10/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, communications, and computing markets.
The DS1814BR-10/T&R belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for reliable microprocessor reset generation, brownout detection, and watchdog-based firmware crash recovery in harsh 5V embedded environments.
FAQ
What is the exact VCC trip point range for DS1814BR-10/T&R?
The DS1814BR-10/T&R has a guaranteed VCC trip point of 4.25 V minimum to 4.50 V maximum, reflecting its 10% tolerance specification around a 4.5 V nominal threshold. This range is validated across –40°C to +85°C and ensures consistent brownout detection in 5V systems before logic errors occur. The DS1814BR-10/T&R datasheet specifies these limits under DC Electrical Characteristics with note 1.
Does DS1814BR-10/T&R support both active-low and active-high reset outputs?
Yes, the DS1814BR-10/T&R provides two independent reset outputs: Pin 1 (RST) is active-low, and Pin 3 (RST) is active-high. This dual-output architecture allows direct interfacing with MCUs requiring either polarity, eliminates need for external inverters, and supports redundant reset signaling. The DS1814BR-10/T&R is a 'B' variant, confirmed by Maxim's pin assignment table for DS181xB devices.
Can the watchdog timer in DS1814BR-10/T&R be disabled, and how?
Yes, the watchdog timer in DS1814BR-10/T&R is disabled by leaving the ST (strobe) input unconnected (floating) or tri-stated. No external pull-up/down is required-the internal design interprets high-impedance ST as watchdog disable. This behavior is explicitly documented in the Operation section and Figure 6 (Watchdog Disable Circuit) of the DS1814/DS1819 datasheet. The DS1814BR-10/T&R retains full voltage monitoring and reset functionality even with watchdog disabled.
What is the minimum reset pulse width generated by DS1814BR-10/T&R?
The DS1814BR-10/T&R guarantees a minimum reset pulse width of 140 ms for both RST and RST outputs, regardless of trigger source-power-up, brownout, or watchdog timeout. This duration meets common microprocessor reset timing requirements and ensures complete initialization of clocks, PLLs, and memory controllers. The DS1814BR-10/T&R datasheet lists tRST and tRPU parameters with min/typ/max values confirming this 140 ms floor.
Is DS1814BR-10/T&R compatible with 3.3V systems?
No, the DS1814BR-10/T&R is a 5V-specific device with a 4.25–4.50 V trip point and rated for VCC up to 5.5 V. It is not intended for 3.3V operation. For 3.3V systems, Maxim offers the DS1819 series (e.g., DS1819BR-10), which has a 2.85–3.00 V trip point. Using DS1814BR-10/T&R on a 3.3V rail would prevent reset assertion during brownout, compromising system reliability.
DS1814BR-10/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:
- 4.375V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/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
DS1814BR-10/T&R FAQ
1.How can I place an order for DS1814BR-10/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1814BR-10/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 DS1814BR-10/T&R reliable?
The price and inventory of DS1814BR-10/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 DS1814BR-10/T&R is usually 5 days.
3.What payment methods are accepted for DS1814BR-10/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1814BR-10/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1814BR-10/T&R?
DS1814BR-10/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1814BR-10/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 DS1814BR-10/T&R?
For technical support, including DS1814BR-10/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1814BR-10/T&R requirements.
6.How does Aetrix verify that DS1814BR-10/T&R is sourced from the original manufacturer or authorized distributors?
All DS1814BR-10/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 DS1814BR-10/T&R meets industry standards.
7.What is the process for return or replacement of DS1814BR-10/T&R?
All DS1814BR-10/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1814BR-10/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 DS1814BR-10/T&R part is unused and in its original packaging.
Return procedure for DS1814BR-10/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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