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Analog Devices Inc./Maxim Integrated DS1819AR-5/T&R
- Part No.:
- DS1819AR-5/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS1819AR-5/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,128
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Product details
Overview
DS1819AR-5/T&R from Maxim Integrated is a 3.3V microprocessor supervisory circuit in SOT-23-5 package, providing precision power monitoring (±5% trip point at 3.00–3.15 V), watchdog timer (1.12 s timeout), and pushbutton reset control with 140 ms minimum active-low reset pulse. It halts and restarts out-of-control microprocessors during power transients or software lockup in embedded industrial controllers.
For engineers reviewing the DS1819AR-5/T&R datasheet, DS1819AR-5/T&R pinout, DS1819AR-5/T&R application, or DS1819AR-5/T&R equivalent, key selection criteria include 3.0V system compatibility, active-low reset output timing, watchdog strobe input behavior, and SOT-23-5 footprint constraints in space-constrained PCB layouts.
Technical Context
The DS1819AR-5/T&R implements a precision bandgap-based voltage monitor with 5 mV hysteresis, ensuring stable reset assertion/deassertion during VCC recovery. Its internal watchdog timer requires ST input toggling every ≤1.12 s to prevent reset activation - a critical safeguard against firmware hangs.
This 'A' variant integrates both PBRST (debounced pushbutton reset input) and ST (watchdog strobe input), delivering dual fault-detection paths: external manual override and autonomous software execution monitoring. The RST output uses a push-pull driver valid down to 1.0 V VCC, supporting brownout-safe reset signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 3.00–3.15 V (±5% tolerance for 3.0 V systems; ensures reliable power-fail detection before microprocessor instability) |
| Reset Active Time | 140–280 ms (guarantees sufficient hold time for processor and power supply stabilization post-power-up or recovery) |
| Watchdog Timeout | 1.12–2.40 s (defines maximum allowable software loop interval before forced reset; configurable via ST pin) |
| Pushbutton Reset Delay | ≥140 ms (debounced, edge-triggered active-low pulse generated on PBRST release) |
| Operating Current | 8–12 µA (ultra-low quiescent current enables use in battery-backed or always-on monitoring circuits) |
| Output Drive | 350 µA high / 3.2–6 mA low (push-pull RST supports direct interface to most microcontroller reset inputs without external pull-up) |
| Temperature Range | −40 °C to +85 °C (industrial-grade operation suitable for factory automation and outdoor electronics) |
Pinout & Package
SOT-23-5 surface-mount package (2.9 mm × 1.6 mm × 1.1 mm), lead-free and RoHS-compliant, optimized for high-density PCB layouts.
| 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; remains valid down to 1.0 V VCC |
| 2 - GND | Ground Reference | Primary return path for internal comparators, watchdog logic, and output driver; must be low-impedance connection |
| 3 - PBRST | Pushbutton Reset Input | Active-low, internally pulled up (50 kΩ typical); debounced and timed to generate ≥140 ms RST pulse on release |
| 4 - ST | Watchdog Strobe Input | Edge-sensitive input requiring transition every ≤1.12 s; floating or tri-stated to disable watchdog function |
| 5 - VCC | Power Supply Input | Accepts 1.0–5.5 V; powers all internal circuitry including voltage reference, comparator, and output stage |
Key Features
| Feature | Design Value |
|---|---|
| 3.0 V System Precision Monitoring | ±5% trip point (3.00–3.15 V) with 5 mV hysteresis prevents chatter during marginal VCC conditions |
| Dual-Fault Detection Architecture | Simultaneous supervision of power integrity (VCC), software execution (ST), and operator intervention (PBRST) |
| Configurable Watchdog | ST pin enables or disables watchdog via hardware connection-no firmware dependency required |
| Brownout-Safe Reset Signaling | RST output remains valid down to 1.0 V VCC; optional 100 kΩ pull-down extends validity to 0 V |
| Pin- and Function-Compatible Replacement | Direct drop-in for MAX823/824/825 in 3.3 V designs, preserving layout and firmware integration effort |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power cycling and firmware crashes in DIN-rail mounted programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to ARM Cortex-M7 MCU upon undervoltage or watchdog timeout. Use Value: Prevents corrupted I/O state and ensures deterministic boot after transient grid dips or EMI-induced lockups. | Use Scenario: Long-term deployment in utility-grade electricity meters exposed to wide temperature swings and intermittent AC line drops. IC Role / Device Role / Timing Role: Primary power supervisor monitoring 3.3 V rail derived from isolated DC-DC converter; provides 140 ms reset hold time for secure flash write completion. Use Value: Guarantees nonvolatile memory integrity during brownout events by extending reset assertion beyond MCU's minimum reset requirement. |
| Medical Diagnostic Handheld | IoT Edge Gateway |
Use Scenario: Battery-powered portable ultrasound device requiring fail-safe restart after accidental button press or firmware hang during image acquisition. IC Role / Device Role / Timing Role: Dual-role supervisor: PBRST accepts mechanical reset button; ST monitors UART activity to detect host processor freeze. Use Value: Eliminates need for separate reset IC and watchdog IC, reducing BOM count and PCB area in compact medical enclosure. | Use Scenario: Cellular-connected gateway aggregating sensor data in remote infrastructure sites with unreliable backup power. IC Role / Device Role / Timing Role: Fault detector interfacing with ESP32-WROVER; asserts RST on VCC sag below 3.0 V or missed ST toggle from WiFi stack heartbeat. Use Value: Enables autonomous recovery without cloud-initiated reboot, minimizing data loss during extended offline periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SESA+ | 5 V nominal operation (4.50–4.75 V trip); no PBRST pin; SOT-23-5 package | Designed for 5 V systems only; lacks pushbutton reset functionality | Select only for legacy 5 V designs where DS1819AR-5/T&R's 3.0 V trip point is incompatible |
| TPS3808G12DBVR | Adjustable threshold (via external resistor); 1.2 V fixed option; 200 ms reset timeout; no integrated watchdog or PBRST | Requires external components for pushbutton debounce and watchdog emulation; higher design overhead | Prefer when fine-grained voltage threshold tuning is required and discrete watchdog implementation is acceptable |
Compared with MAX823SESA+ and TPS3808G12DBVR, the DS1819AR-5/T&R uniquely integrates 3.0 V precision monitoring, hardware watchdog, and debounced pushbutton reset in one SOT-23-5 device-reducing component count and eliminating firmware-level watchdog management.
Availability
DS1819AR-5/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical handheld diagnostics, and IoT edge gateways requiring stable component supply across extended production lifecycles.
Supply support for DS1819AR-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 and mixed-signal ICs for industrial, automotive, and communications applications, emphasizing reliability and integration.
The DS1819AR-5/T&R belongs to the MicroMonitor™ family of supervisory circuits engineered specifically for robust, low-power microprocessor reset and watchdog functions in 3.3 V embedded systems.
FAQ
What is the exact VCC trip point range for DS1819AR-5/T&R?
The DS1819AR-5/T&R has a guaranteed VCC trip point of 3.00 V to 3.15 V at ±5% tolerance, specified over −40 °C to +85 °C. This range ensures reliable detection of undervoltage conditions in 3.0 V systems before microprocessor operation becomes unstable. The trip point is set by an internal precision bandgap reference and comparator, with 5 mV hysteresis to prevent oscillation near the threshold. DS1819AR-5/T&R maintains this accuracy without external components.
Does DS1819AR-5/T&R support both watchdog and pushbutton reset simultaneously?
Yes, DS1819AR-5/T&R is the 'A' variant, which includes both ST (watchdog strobe input) and PBRST (pushbutton reset input) pins. It can monitor software execution via ST transitions every ≤1.12 s while also accepting manual reset requests via PBRST. Both functions independently assert the RST output low for ≥140 ms. DS1819AR-5/T&R does not require firmware coordination between these features - they operate autonomously in hardware.
Can DS1819AR-5/T&R operate below 3.0 V, and what happens to RST output?
Yes, DS1819AR-5/T&R operates down to 1.0 V VCC, and its RST output remains valid (logic-low or logic-high) across that range. Below 1.0 V, adding a 100 kΩ pull-down resistor from RST to GND extends valid reset signaling down to 0 V VCC - critical for controlled shutdown during deep brownout. This behavior is explicitly characterized in the datasheet and applies directly to DS1819AR-5/T&R without modification.
Is DS1819AR-5/T&R pin-compatible with MAX823 series devices?
Yes, DS1819AR-5/T&R is pin- and function-compatible with the MAX823/824/825 family for 3.3 V applications. Pin mapping (RST, GND, PBRST, ST, VCC) matches identically in SOT-23-5, and electrical timing (140 ms reset pulse, 1.12 s watchdog timeout) aligns. DS1819AR-5/T&R replaces MAX823 variants in 3.0 V systems without PCB changes, though voltage trip points differ - MAX823 targets 5 V rails.
What is the maximum recommended VCC slew rate for reliable DS1819AR-5/T&R operation?
The DS1819AR-5/T&R specifies a minimum VCC slew rate of 12.5 V/s on the rising edge to ensure clean power-up reset assertion. Slower ramp rates may cause incomplete internal initialization or metastability in the voltage monitor circuit. This requirement is verified per the datasheet's AC Electrical Characteristics table and applies strictly to DS1819AR-5/T&R - not inferred from other family members. Layout practices should minimize series resistance and inductance on the VCC path to meet this spec.
DS1819AR-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:
- 3.075V
- 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
DS1819AR-5/T&R FAQ
1.How can I place an order for DS1819AR-5/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1819AR-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 DS1819AR-5/T&R reliable?
The price and inventory of DS1819AR-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 DS1819AR-5/T&R is usually 5 days.
3.What payment methods are accepted for DS1819AR-5/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1819AR-5/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1819AR-5/T&R?
DS1819AR-5/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1819AR-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 DS1819AR-5/T&R?
For technical support, including DS1819AR-5/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1819AR-5/T&R requirements.
6.How does Aetrix verify that DS1819AR-5/T&R is sourced from the original manufacturer or authorized distributors?
All DS1819AR-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 DS1819AR-5/T&R meets industry standards.
7.What is the process for return or replacement of DS1819AR-5/T&R?
All DS1819AR-5/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1819AR-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 DS1819AR-5/T&R part is unused and in its original packaging.
Return procedure for DS1819AR-5/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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