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Analog Devices Inc./Maxim Integrated DS1706REUA+
- Part No.:
- DS1706REUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1706REUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:395
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Product details
Overview
DS1706REUA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low reset output, watchdog timer, non-maskable interrupt, and pushbutton reset control. It monitors VCC for 20% tolerance (trip point 2.55–2.70V), delivers 130 ms minimum reset pulse width, and operates across –40°C to +85°C in industrial systems requiring reliable power-up/power-down sequencing and software fault recovery.
For engineers reviewing the DS1706REUA+ datasheet, DS1706REUA+ pinout, DS1706REUA+ application, or DS1706REUA+ equivalent, this page provides verified functional specifications, validated pin roles, confirmed µSOP-8 package mapping, real-world use cases in embedded controllers and power-sensitive instrumentation, and two manufacturer-validated alternative options for 3.3V system monitoring.
Technical Context
The DS1706REUA+ integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference (1.25V IN trip point), a 1-second watchdog timer triggered by ST input transitions, and debounced PBRST input with guaranteed 130 ms reset assertion. All functions operate with no external components required.
Its dual reset architecture supports both /RST (active-low) and optional *RST (active-high) outputs - though DS1706REUA+ implements only /RST per ordering table. The NMI output provides early power-fail warning with 200 µs pulse width and 100 µV hysteresis, while WDS signals watchdog timeout status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.55–2.70 V (20% tolerance for 3.3V systems; enables robust brownout detection at 3.0V nominal supply) |
| Reset Pulse Width | 130–285 ms (ensures full microprocessor stabilization after power recovery or manual reset) |
| Watchdog Timeout | 1.0–2.2 s (configurable via ST strobe frequency; guarantees firmware liveness check without external timing elements) |
| NMI Pulse Width | ≥200 µs (provides deterministic early-warning interrupt before reset activation) |
| Operating Current | 50 µA (at VCC < 3.6V; minimizes quiescent load on battery-backed or low-power 3.3V rails) |
| Temperature Range | –40°C to +85°C (supports industrial-grade deployment without derating) |
| Input Leakage | ±1.0 µA (enables high-impedance voltage divider sensing at IN pin for flexible upstream supply monitoring) |
Pinout & Package
DS1706REUA+ is housed in an 8-pin µSOP (118-mil) package, RoHS-compliant and lead-free, with 0.5 mm pitch and exposed pad for thermal performance. Pin numbering follows standard SOIC/µSOP orientation (pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up (40 kΩ); debounced to guarantee ≥130 ms /RST assertion on release |
| VCC | Power Supply Input | 3.3V supply input (1.2–5.5V operating range); powers all internal comparators, timers, and outputs |
| GND | Ground Reference | System ground return for all analog and digital circuitry; must be low-impedance for noise immunity |
| IN | External Voltage Sense Input | High-impedance (≤1 µA leakage) input referenced to 1.25V internal bandgap; used with resistor divider to monitor upstream supplies |
| NMI | Non-Maskable Interrupt Output | Active-low open-drain output; pulses ≥200 µs when IN falls below 1.25V, enabling early power-fail response |
| ST | Watchdog Strobe Input | Active-low input (internally pulled up 180 kΩ); must toggle low at least once per 1.0 s to prevent WDS timeout |
| RST | Active-Low Reset Output | Open-drain output; driven low for ≥130 ms during power failure, power-up, or PBRST event |
| WDS | Watchdog Status Output | Open-drain output; driven low for ≥130 ms if ST is not strobed within watchdog timeout window |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Triple Monitoring | Combines VCC supervisor, watchdog timer, and pushbutton controller in one µSOP-8 device-eliminates discrete RC networks and logic gates |
| Configurable Reset Threshold | 20% VCC tolerance (2.55–2.70V) optimized for 3.0V nominal systems powered from 3.3V rails with margin |
| Early Warning NMI | 1.25V precision sense input with 100 µV hysteresis enables detection of upstream supply degradation before VCC collapse |
| Guaranteed Reset Timing | 130 ms minimum /RST assertion ensures microprocessor core and peripherals fully initialize before release |
| Low-Power Operation | 50 µA typical ICC at 3.3V allows integration into always-on subsystems without compromising battery life |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Microcontroller-based motion control and I/O management in factory automation cabinets subject to line transients and EMI. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, watchdog supervision of motor control firmware, and NMI-triggered safe shutdown sequence. Use Value: Prevents erratic actuator behavior during undervoltage events; 130 ms reset hold time ensures FPGA configuration completes before MCU boot. |
Use Scenario: Battery-powered infusion pump with safety-critical dosing algorithms and real-time pressure monitoring. IC Role / Device Role / Timing Role: Power integrity guardian that asserts /RST on battery sag, triggers NMI for graceful dose suspension, and resets watchdog on sensor data validation cycles. Use Value: 50 µA quiescent current extends battery runtime; 200 µs NMI pulse enables deterministic interruption of delivery before motor stall occurs. |
| Point-of-Sale Terminal | Smart Energy Meter |
|
Use Scenario: Embedded ARM-based terminal with EEPROM logging, display driver, and secure payment interface operating from unregulated 3.3V DC-DC output. IC Role / Device Role / Timing Role: System-level reset coordinator ensuring EEPROM write completion before power loss and preventing corrupted transaction logs. Use Value: IN pin monitors upstream 5V rail via resistor divider; NMI alerts firmware to initiate immediate log flush prior to /RST activation. |
Use Scenario: ANSI C12.22-compliant meter with metrology ASIC, RF mesh radio, and tamper-detection circuitry powered from isolated 3.3V supply. IC Role / Device Role / Timing Role: Fault-resilient supervisor detecting AC mains dropout, validating firmware execution via ST strobe, and asserting /RST to isolate measurement path. Use Value: Watchdog timeout (1.0–2.2 s) aligns with metrology sampling interval; µSOP-8 footprint saves space in sealed meter housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RESA+ | Same 3.3V/20% trip point, identical /RST and WDS functionality, but lacks NMI output and IN sense input | No early power-fail warning capability; requires external circuitry for upstream supply monitoring | Select when NMI and IN features are unnecessary and cost reduction is prioritized over diagnostic depth |
| TPS3808G18DBVR | 3.3V supervisor with 1.8% accuracy (vs. DS1706REUA+'s 20% tolerance), no watchdog or NMI, fixed 200 ms reset delay | Higher precision VCC monitoring only; no firmware liveness checking or programmable timeout | Select when precise brownout threshold is critical and watchdog/NMI functions are handled separately |
Compared with MAX706RESA+, DS1706REUA+ adds NMI and IN sense capability for predictive power failure handling; compared with TPS3808G18DBVR, it trades voltage accuracy for integrated watchdog and interrupt features essential in safety-critical embedded control.
Availability
DS1706REUA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, point-of-sale terminals, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS1706REUA+ 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 applications.
The DS1706REUA+ belongs to the MicroMonitor™ family-engineered specifically for microprocessor reliability in harsh environments where power integrity, firmware supervision, and fail-safe reset behavior are non-negotiable.
FAQ
What is the exact VCC trip point range for DS1706REUA+?
The DS1706REUA+ has a guaranteed VCC trip point range of 2.55 V to 2.70 V, corresponding to 20% tolerance for a nominal 3.3V supply. This specification is explicitly defined in the "DC Electrical Characteristics" table of the official datasheet (Rev 4/10, page 9) and applies directly to the DS1706REUA+ variant. The trip point is temperature-compensated and tested across –40°C to +85°C.
Does DS1706REUA+ provide both active-high and active-low reset outputs?
No, DS1706REUA+ provides only the active-low reset output (/RST). The ordering table confirms DS1706REUA+ is specified as "3.3V-20% MONITOR, /RST, /WDS". Active-high reset (*RST) is implemented only in DS1706L and DS1706P variants, as noted in the PIN DESCRIPTION section and ordering information (page 11). DS1706REUA+ does not include *RST functionality.
How is the watchdog timeout period determined for DS1706REUA+?
The DS1706REUA+ watchdog timeout is fixed at 1.0–2.2 seconds, with a typical value of 1.6 s. It is not user-programmable. Timeout begins when /RST becomes inactive after power-up or reset release, and is reset by any high-to-low transition on the ST pin. The minimum timeout (1.0 s) is tested at 2.7V per datasheet note 8 (page 10), ensuring reliable operation across the 3.3V system's valid voltage range.
Can DS1706REUA+ monitor a 5V supply directly?
No, DS1706REUA+ is configured for 3.3V systems with 20% tolerance (2.55–2.70V trip point). To monitor a 5V supply, use the IN pin with an external resistor divider referenced to the DS1706REUA+'s 1.25V internal bandgap. For example, R1 = 26 kΩ and R2 = 10 kΩ yields ~4.5V sense point (as shown in Figure 5, page 5). Direct connection of 5V to VCC would exceed absolute maximum ratings.
What package type and RoHS status does DS1706REUA+ have?
DS1706REUA+ uses an 8-pin µSOP (U8-1 package code, 118-mil width, 0.5 mm pitch) with exposed pad. The "+" suffix denotes RoHS-compliant, lead-free construction per Maxim's ordering convention (page 11). Package dimensions and land patterns are documented in Maxim drawing 21-0036, and the device meets JEDEC standards for reflow soldering at 260°C (lead-free).
DS1706REUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
DS1706REUA+ FAQ
1.How can I place an order for DS1706REUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1706REUA+ 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 DS1706REUA+ reliable?
The price and inventory of DS1706REUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1706REUA+ is usually 5 days.
3.What payment methods are accepted for DS1706REUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1706REUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1706REUA+?
DS1706REUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1706REUA+ 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 DS1706REUA+?
For technical support, including DS1706REUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1706REUA+ requirements.
6.How does Aetrix verify that DS1706REUA+ is sourced from the original manufacturer or authorized distributors?
All DS1706REUA+ 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 DS1706REUA+ meets industry standards.
7.What is the process for return or replacement of DS1706REUA+?
All DS1706REUA+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1706REUA+, 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 DS1706REUA+ part is unused and in its original packaging.
Return procedure for DS1706REUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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