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Analog Devices Inc./Maxim Integrated DS1814CR-5+T&R
- Part No.:
- DS1814CR-5+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS1814CR-5+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
DS1814CR-5+T&R from Maxim Integrated is a 5V microprocessor supervisory circuit with active-low reset output, 4.50V power supply monitoring threshold, 140ms minimum reset pulse width, watchdog timer (1.12s timeout), and pushbutton reset support. It operates in industrial temperature range (-40°C to +85°C) and is used in embedded control systems requiring reliable power-up/power-down sequencing and software fault recovery.
For engineers reviewing the DS1814CR-5+T&R datasheet, DS1814CR-5+T&R pinout, DS1814CR-5+T&R application, or DS1814CR-5+T&R equivalent, key selection criteria include VCC trip point accuracy (±5%), SOT-23-5 package compatibility, RST timing behavior during brownout, watchdog strobe input requirements, and pushbutton debounce implementation.
Technical Context
The DS1814CR-5+T&R implements a precision voltage monitor with 4.50V nominal trip point and 10mV hysteresis, ensuring stable reset assertion during VCC transients. Its internal watchdog timer requires ST input toggling every 1.12 seconds to prevent timeout-induced reset activation.
This variant ('C' suffix) provides both active-low RST (Pin 1) and active-high RST (Pin 3), plus PBRST (Pin 4) for debounced pushbutton reset initiation - distinct from 'A' (RST + PBRST only) and 'B' (RST + RST only) versions. All variants use push-pull RST outputs valid down to 1.0V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50V (nominal); triggers reset when supply drops below this level to protect processor operation |
| Reset Pulse Width | 140–280ms; ensures sufficient hold time for microprocessor initialization after power recovery |
| Watchdog Timeout | 1.12s (min); forces reset if ST input remains static, indicating software hang or lockup |
| Operating Temp Range | -40°C to +85°C; supports deployment in industrial environments without derating |
| Supply Current | 10–15µA; enables low-power system monitoring without significant battery drain |
| Input Hysteresis | 10mV; prevents chatter during slow VCC ramp-up/down near trip threshold |
| Package | SOT-23-5; surface-mount footprint compatible with automated PCB assembly |
Pinout & Package
SOT-23-5 package: 5-pin, small-outline transistor outline with gull-wing leads; body dimensions 2.9mm × 1.6mm × 1.1mm per JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low reset output; drives microprocessor RESET# input low during fault conditions |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | RST | Active-high reset output; complements Pin 1 for logic-level flexible reset interface |
| 4 | PBRST | Pushbutton reset input; internally pulled up; debounced to generate ≥140ms RST pulse on release |
| 5 | VCC | Primary power supply input (1.0–5.5V); powers internal reference, comparator, and watchdog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Triple-fault monitoring | Simultaneously detects power failure, software hang (via watchdog), and external manual reset request |
| Valid RST down to 1.0V VCC | Ensures deterministic reset assertion even during deep brownout or battery depletion |
| Configurable watchdog enable | Disabling via floating ST input eliminates need for additional control logic or firmware changes |
| Internal pushbutton debounce | Removes mechanical switch bounce without external RC network or MCU firmware intervention |
| Pin-compatible with MAX823/24/25 | Enables drop-in replacement in existing designs using those Maxim supervisory ICs |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Power interruption during motor actuation or sensor sampling causes CPU lockup. IC Role / Device Role / Timing Role: DS1814CR-5+T&R monitors VCC and asserts RST if supply dips below 4.50V; watchdog resets CPU if ST signal stalls >1.12s. Use Value: Prevents unsafe state persistence by forcing controlled reboot before hardware damage or dosage error occurs. | Use Scenario: Operator-initiated emergency stop requires immediate, glitch-free processor halt. IC Role / Device Role / Timing Role: DS1814CR-5+T&R accepts momentary PBRST press and generates clean 140ms RST pulse with hardware debounce. Use Value: Eliminates risk of spurious reset from contact bounce, ensuring single, deterministic shutdown event. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Voltage sag during load switching disrupts meter firmware execution. IC Role / Device Role / Timing Role: DS1814CR-5+T&R holds RST active for ≥140ms after VCC recovers to stabilize power rails and CPU clock domain. Use Value: Guarantees reliable restart without corrupted flash writes or missed pulse counting during grid fluctuations. | Use Scenario: ECU must survive cold-crank battery dip (down to ~6V) and recover without latch-up. IC Role / Device Role / Timing Role: DS1814CR-5+T&R maintains valid RST output down to 1.0V VCC and asserts reset at 4.50V trip point. Use Value: Enables safe reset assertion during severe undervoltage, preventing undefined I/O states or memory corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SESA+ | 5V supply, 4.63V trip point, single active-low RST, no PBRST or RST pin; watchdog disabled | Lacks pushbutton reset and dual-reset outputs; suitable only for basic power-monitoring-only use cases | Select when watchdog and manual reset are unnecessary and board layout already accommodates MAX823 footprint |
| TPS3808G33DBVR | 3.3V fixed trip, 200ms reset delay, no watchdog or PBRST; open-drain RST output | Requires external pull-up; incompatible with DS1814CR-5+T&R's push-pull drive and 5V operation | Choose for low-quiescent-current (1.5µA) 3.3V systems where watchdog and pushbutton features are omitted |
Compared with MAX823SESA+ and TPS3808G33DBVR, the DS1814CR-5+T&R uniquely integrates 5V supervision, dual-reset polarity, hardware-debounced pushbutton input, and configurable watchdog - enabling full-system fault coverage in a single SOT-23-5 device without external components.
Availability
DS1814CR-5+T&R is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply across extended production lifecycles.
Supply support for DS1814CR-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 high-reliability applications.
The DS1814CR-5+T&R belongs to the MicroMonitor family, engineered specifically for robust microprocessor supervision in harsh environments where power integrity, software reliability, and user-initiated reset must be handled in hardware.
FAQ
What is the exact VCC trip point tolerance for DS1814CR-5+T&R?
The DS1814CR-5+T&R has a ±5% trip point tolerance, with a nominal VCC trip voltage of 4.50V (range: 4.25V to 4.75V). This specification is guaranteed over the full industrial temperature range (-40°C to +85°C) and applies to the 'C' variant with '5' tolerance code as indicated in the part marking and datasheet tables.
Does DS1814CR-5+T&R support both active-low and active-high reset outputs?
Yes, DS1814CR-5+T&R provides two independent reset outputs: Pin 1 (RST) is active-low, and Pin 3 (RST) is active-high. This dual-output capability allows direct interface with microprocessors requiring either reset polarity without external inverters or level-shifting circuitry.
How is the watchdog timer enabled or disabled on DS1814CR-5+T&R?
The watchdog timer on DS1814CR-5+T&R is enabled by driving the ST input (Pin 4) with periodic transitions; it times out after 1.12 seconds if no edge occurs. To disable it, leave the ST input floating (high-impedance) - no external pull-up or pull-down is required, and the watchdog function ceases automatically.
Can DS1814CR-5+T&R operate below 5V supply voltage?
Yes, DS1814CR-5+T&R operates over 1.0V to 5.5V VCC. Its RST outputs remain valid down to 1.0V, and the internal voltage reference functions correctly across this range. However, the 4.50V trip point is specified only for VCC ≥ 4.50V; below that, reset behavior follows the internal comparator's response to falling VCC.
Is DS1814CR-5+T&R pin-compatible with other devices in the DS1814 family?
Yes, all DS1814 variants (A, B, C) share identical SOT-23-5 pinouts and footprints. The DS1814CR-5+T&R uses the same Pin 1–5 assignment as DS1814A and DS1814B, differing only in internal functionality (e.g., presence of PBRST and RST pins), not physical layout or soldering pattern.
DS1814CR-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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- 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
DS1814CR-5+T&R FAQ
1.How can I place an order for DS1814CR-5+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1814CR-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 DS1814CR-5+T&R reliable?
The price and inventory of DS1814CR-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 DS1814CR-5+T&R is usually 5 days.
3.What payment methods are accepted for DS1814CR-5+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1814CR-5+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1814CR-5+T&R?
DS1814CR-5+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1814CR-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 DS1814CR-5+T&R?
For technical support, including DS1814CR-5+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1814CR-5+T&R requirements.
6.How does Aetrix verify that DS1814CR-5+T&R is sourced from the original manufacturer or authorized distributors?
All DS1814CR-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 DS1814CR-5+T&R meets industry standards.
7.What is the process for return or replacement of DS1814CR-5+T&R?
All DS1814CR-5+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1814CR-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 DS1814CR-5+T&R part is unused and in its original packaging.
Return procedure for DS1814CR-5+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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