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Analog Devices Inc./Maxim Integrated DS1706LEUA
- Part No.:
- DS1706LEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1706LEUA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,606
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Product details
Overview
DS1706LEUA from Maxim Integrated is a 5.0V ±5% microprocessor supervisory circuit with active-high reset (RST), watchdog status output (WDS), and non-maskable interrupt (NMI) for embedded systems. It monitors VCC, detects power transients, debounces pushbutton reset, and provides 130ms minimum reset pulse width and 1.0s watchdog timeout. Used in industrial controllers requiring reliable power-up sequencing and fail-safe restart.
For engineers reviewing the DS1706LEUA datasheet, DS1706LEUA pinout, DS1706LEUA application, or DS1706LEUA equivalent, key selection criteria include its 5V-5% VCC trip point (4.50–4.75V), RST active-high output, WDS watchdog status flag, NMI early-warning interrupt, and compatibility with 8-pin µSOP packaging for space-constrained PCB layouts.
Technical Context
The DS1706LEUA integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference, pushbutton reset debouncing with guaranteed 130ms active reset pulse, and a 1.0s watchdog timer triggered by ST input strobes. Its IN pin supports external voltage sensing at user-defined points via resistor divider, enabling early power-fail detection upstream of the microprocessor.
It delivers RST as active-high (distinct from /RST variants), outputs WDS low on watchdog timeout, and asserts NMI for ≥200µs when monitored supply falls below 1.25V threshold. All functions operate across -40°C to +85°C with 50µA typical supply current at VCC < 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50–4.75 V (5.0V ±5% tolerance; ensures reset activation before microprocessor brownout) |
| Reset Output Type | RST active-high (directly drives enable inputs requiring high-level assertion without external inversion) |
| Watchdog Timeout | 1.0–2.2 s (configures system recovery window; ST must be strobed within this period to prevent WDS assertion) |
| NMI Pulse Width | ≥200 µs (provides sufficient time for firmware to initiate controlled shutdown before RST activation) |
| Reset Pulse Width | 130–285 ms (guarantees stable power and processor initialization before release from reset) |
| Supply Current | 50 µA typical (VCC < 3.6V); enables low-power operation in battery-backed or energy-sensitive systems) |
| Operating Temp | -40°C to +85°C (supports industrial-grade deployment without derating) |
Pinout & Package
DS1706LEUA is housed in an 8-pin µSOP (118-mil) package, surface-mount compatible with fine-pitch PCB assembly and thermal performance suitable for industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low debounced input; initiates 130ms RST pulse on button release; internally pulled up to VCC (40kΩ typical) |
| VCC | Power Supply | Primary 5.0V supply input; powers all internal circuits and sets reference for VCC monitoring |
| GND | Ground | Reference return path for all analog and digital functions; must be low-impedance connection |
| IN | Voltage Sense Input | High-impedance comparator input (trip = 1.25V); used with external resistor divider to monitor upstream supplies |
| WDS | Watchdog Status Output | Active-low open-drain output asserted for ≥130ms if ST not strobed within watchdog timeout |
| RST | Active-High Reset Output | CMOS-compatible active-high reset signal; directly interfaces with processors requiring high-level reset assertion |
| ST | Strobe Input | Watchdog trigger input; high-to-low transition resets 1.0s timeout counter; internally pulled up (180kΩ typical) |
| NMI | Non-Maskable Interrupt | Active-low interrupt output pulsed ≥200µs on IN voltage drop; enables firmware-initiated graceful shutdown |
Key Features
| Feature | Design Value |
|---|---|
| 5.0V ±5% VCC Monitor | Guarantees reset activation between 4.50V and 4.75V - matches standard 5V rail tolerances without external calibration |
| Active-High RST Output | Eliminates need for external inverter when interfacing with MCUs or FPGAs requiring high-active reset (e.g., ARM Cortex-M series) |
| Configurable External Sensing (IN) | Supports monitoring of higher-voltage rails (e.g., 12V or 24V) via resistor divider - extends protection to upstream power stages |
| Debounced Pushbutton Interface | Hardware-based debouncing and fixed 130ms pulse ensure reliable manual reset without firmware overhead or timing jitter |
| 1.0s Watchdog Timer | Provides deterministic recovery window; ST strobe requirement enforces software liveness checks without CPU cycle counting |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Power cycling during field maintenance or unexpected AC dropout in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, manual reset, and watchdog supervision to ensure deterministic boot and runtime recovery. Use Value: Prevents corrupted state execution after brownout by holding MCU in RST until VCC stabilizes above 4.50V and enforcing 130ms minimum reset hold time. |
Use Scenario: Real-time data acquisition and analysis during patient monitoring where firmware lockup must trigger immediate hardware-level recovery. IC Role / Device Role / Timing Role: System health monitor asserting NMI for controlled data save and RST for full restart, synchronized with ST strobes from ADC control logic. Use Value: Enables >200µs NMI warning before RST activation - sufficient time to flush buffer memory and log error context prior to hard reset. |
| Telecom Remote Terminal Unit | Energy Meter with Tamper Detection |
|
Use Scenario: Long-term unattended operation in outdoor cabinets subject to temperature extremes and intermittent power. IC Role / Device Role / Timing Role: Power supervisor ensuring valid 5V rail before enabling communication ICs and asserting WDS on watchdog timeout to flag firmware hang. Use Value: 1.0s watchdog timeout aligns with modem keep-alive intervals; WDS output can drive external latch or LED indicator for remote fault identification. |
Use Scenario: Revenue-grade metering where unauthorized physical access or power manipulation must trigger secure shutdown and audit logging. IC Role / Device Role / Timing Role: Dual-role supervisor: IN pin monitors tamper-detection circuit voltage; PBRST accepts sealed enclosure switch for authorized reset. Use Value: Hardware-enforced 130ms reset pulse prevents partial initialization; active-high RST simplifies interface with secure microcontroller reset controller pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706ESA | Pin-compatible 5V-10% variant with /RST (active-low) and /WDS outputs; no NMI output | Lacks NMI early-warning interrupt; requires external inverter for RST-high systems | Select MAX706ESA only if system design already uses active-low reset and does not require pre-reset interrupt capability |
| TPS3808G12DBVR | TI device with 1.2V threshold, adjustable reset delay, and /RESET output only; no watchdog or NMI | No watchdog timer or NMI function; reset delay configurable via external capacitor (not fixed 130ms) | Choose TPS3808G12DBVR when only basic VCC monitoring is needed and board space allows for timing capacitor placement |
Compared with MAX706ESA and TPS3808G12DBVR, DS1706LEUA uniquely combines active-high RST, integrated watchdog with WDS flag, and NMI for early power-fail warning - making it optimal for systems requiring layered fault response without additional support components.
Availability
DS1706LEUA is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and telecom infrastructure requiring stable component supply, long-lifecycle support, and consistent µSOP packaging for automated SMT assembly.
Supply support for DS1706LEUA 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, integration, and low-power operation.
The DS1706LEUA belongs to the MicroMonitor™ family of supervisory circuits engineered specifically for robust microprocessor reset, watchdog, and power-fail warning in harsh industrial environments.
FAQ
What is the VCC trip point range for DS1706LEUA?
The DS1706LEUA has a specified VCC trip point of 4.50V to 4.75V, corresponding to 5.0V ±5% tolerance. This range ensures reliable reset assertion before most 5V microprocessors enter undefined operation due to brownout. The DS1706LEUA's trip point is factory-trimmed and tested across temperature, eliminating need for external calibration or adjustment.
Does DS1706LEUA provide both active-high and active-low reset outputs?
No - DS1706LEUA provides only RST (active-high reset) and WDS (active-low watchdog status). Unlike DS1706EUA or DS1706ESA variants, it does not include /RST. The "L" suffix explicitly denotes active-high RST output, making DS1706LEUA suitable for direct interface with processors requiring high-level reset assertion without external inverters.
How does the watchdog timer in DS1706LEUA operate?
The DS1706LEUA watchdog timer starts timing upon RST deactivation and times out after 1.0–2.2 seconds if no high-to-low transition occurs on the ST pin. On timeout, WDS is driven low for ≥130ms. ST must be strobed regularly - typically from a microprocessor address or control line - to prevent false timeouts. This behavior is fully hardware-based and requires no firmware intervention.
Can DS1706LEUA monitor voltages other than 5V?
Yes - the IN pin accepts externally divided voltages referenced to the internal 1.25V comparator threshold. For example, a resistor divider can scale a 12V rail down to 1.25V at IN, enabling DS1706LEUA to detect upstream power loss before the 5V regulator drops out. The DS1706LEUA's IN input is high-impedance and supports user-defined sense points per Figure 5 in the datasheet.
What is the purpose of the NMI output on DS1706LEUA?
The NMI output on DS1706LEUA provides a non-maskable interrupt pulse (≥200µs wide) when the IN pin voltage falls below 1.25V, signaling imminent power failure. This gives firmware time to execute critical tasks - such as saving volatile data or logging fault conditions - before RST activates. NMI is distinct from RST and operates independently, enabling two-tiered system response.
DS1706LEUA 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
DS1706LEUA FAQ
1.How can I place an order for DS1706LEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1706LEUA 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 DS1706LEUA reliable?
The price and inventory of DS1706LEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1706LEUA is usually 5 days.
3.What payment methods are accepted for DS1706LEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1706LEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1706LEUA?
DS1706LEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1706LEUA 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 DS1706LEUA?
For technical support, including DS1706LEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1706LEUA requirements.
6.How does Aetrix verify that DS1706LEUA is sourced from the original manufacturer or authorized distributors?
All DS1706LEUA 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 DS1706LEUA meets industry standards.
7.What is the process for return or replacement of DS1706LEUA?
All DS1706LEUA units undergo pre-shipment inspection (PSI). If there is an issue with DS1706LEUA, 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 DS1706LEUA part is unused and in its original packaging.
Return procedure for DS1706LEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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