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Analog Devices Inc./Maxim Integrated DS1706LESA+T&R
- Part No.:
- DS1706LESA+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1706LESA+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,612
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Product details
Overview
DS1706LESA+T&R from Maxim Integrated is a 5V ±5% microprocessor supervisory circuit with active-high reset output (RST), watchdog status output (WDS), non-maskable interrupt (NMI), and pushbutton reset input (PBRST). It monitors VCC, detects power transients, provides early warning via NMI, and delivers 130 ms minimum reset pulse width. Used in embedded industrial controllers requiring reliable power-up/power-down sequencing and software fault recovery.
For engineers reviewing the DS1706LESA+T&R datasheet, DS1706LESA+T&R pinout, DS1706LESA+T&R application, or DS1706LESA+T&R equivalent, key selection criteria include VCC trip point (4.50–4.75 V), 130 ms reset timeout, 1 s watchdog timeout, industrial temperature range (−40°C to +85°C), and compatibility with 8-pin SOIC footprint.
Technical Context
The DS1706LESA+T&R implements three independent monitoring functions: precision VCC threshold detection using an internal bandgap reference (VTP = 1.25 V), debounced pushbutton reset with guaranteed 130 ms active pulse, and a 1-second watchdog timer triggered by ST input strobes. All functions operate within a single 8-pin SOIC package without external components.
Its power monitor uses dual-sense capability-direct VCC monitoring plus high-impedance IN pin for upstream supply sensing-and generates both RST (active-high) and NMI (active-low, 200 µs pulse) on out-of-tolerance events. The watchdog resets on each ST high-to-low transition and asserts WDS low for ≥130 ms upon timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50–4.75 V; ensures reset assertion before 5V system brownout affects processor operation |
| Reset Pulse Width | 130–285 ms; guarantees sufficient time for power supply and CPU stabilization after power-up or recovery |
| Watchdog Timeout | 1.0–2.2 s; provides robust software execution monitoring with margin against timing jitter |
| NMI Pulse Width | ≥200 µs; delivers clean, noise-immune early-warning interrupt for controlled shutdown |
| Operating Current | 50 µA at VCC < 3.6 V; enables low-power operation in battery-backed or energy-sensitive systems |
| IN Pin Trip Voltage | 1.20–1.30 V; allows flexible upstream voltage sensing via resistor divider with precise 1.25 V reference |
| Temperature Range | −40°C to +85°C; supports deployment in industrial control cabinets and outdoor embedded equipment |
Pinout & Package
DS1706LESA+T&R is housed in an 8-pin SOIC (150-mil) package, RoHS-compliant and tape-and-reel packaged (T&R).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up (40 kΩ); debounced and timed to generate ≥130 ms RST pulse on release |
| VCC | Power Supply | Primary supply input (1.2–5.5 V); powers all internal circuits and defines trip thresholds |
| GND | Ground | Reference node for all analog comparators and digital outputs |
| IN | Voltage Sense Input | High-impedance (≤1 µA leakage); monitors external supply via resistor divider referenced to 1.25 V internal bandgap |
| NMI | Non-Maskable Interrupt Output | Active-low, open-drain; pulses ≥200 µs when IN or VCC falls below threshold, enabling graceful shutdown |
| ST | Strobe Input | Active-low watchdog trigger; high-to-low transition resets 1 s timeout counter |
| RST | Active-High Reset Output | Push-pull, logic-high active; holds microprocessor in reset during power instability or software fault |
| WDS | Watchdog Status Output | Active-low, open-drain; signals watchdog timeout event to external logic or indicator |
Key Features
| Feature | Design Value |
|---|---|
| Triple-function supervision | Integrates VCC monitoring, pushbutton reset, and watchdog timer in one IC-eliminates discrete RC networks and logic gates |
| Configurable reset polarity | DS1706L variant provides RST (active-high) instead of /RST, simplifying interface with processors lacking active-low reset inputs |
| Upstream supply sensing | IN pin enables early detection of main rail collapse before local VCC drops, extending system response time |
| Noise-immune NMI generation | 5 µs minimum detect window and 100 µV hysteresis prevent false interrupts from supply ripple or EMI |
| Pin-compatible upgrade path | Direct replacement for MAX705/MAX706 in DIP, SOIC, and µSOP footprints-no PCB redesign required |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Continuous operation in factory-floor automation where power transients and software lockups must not cause uncontrolled motion or data loss. IC Role / Device Role / Timing Role: Supervisory controller providing VCC brownout detection, NMI-triggered safe state entry, and watchdog-enforced firmware recovery. Use Value: Prevents hazardous actuator movement by asserting RST within 8 µs of VCC drop and delivering 130 ms reset hold for deterministic restart. | Use Scenario: Battery-powered infusion device requiring fail-safe shutdown on main supply failure and periodic software health verification. IC Role / Device Role / Timing Role: Power integrity monitor and watchdog enforcer; IN pin senses battery voltage via divider, ST tied to MCU timer output. Use Value: Enables >200 µs NMI warning before reset, allowing pump motor coast-down and EEPROM logging prior to RST assertion. |
| Telecom Remote Terminal Unit | Smart Energy Meter |
Use Scenario: Outdoor RTU exposed to wide temperature swings and lightning-induced surges on 48 V DC input, requiring robust power sequencing. IC Role / Device Role / Timing Role: Dual-sense supervisor: VCC monitors local 5V LDO, IN monitors upstream 48 V rail via 39:1 divider for early fault detection. Use Value: Extends system uptime by triggering NMI at 42 V (pre-brownout), giving 100+ ms to save configuration before RST activates at 4.5 V. | Use Scenario: Revenue-grade meter operating 24/7 with tamper detection, requiring guaranteed reset on AC dropout and firmware crash. IC Role / Device Role / Timing Role: System-level watchdog and power supervisor; PBRST connected to tamper switch, ST driven by real-time clock interrupt. Use Value: Guarantees 130 ms reset pulse even during brief AC dips, preventing partial writes to flash memory and ensuring metering accuracy. |
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, but provides /RST (active-low) and no RST (active-high) output; VCC trip = 4.40 V (±10%) | Suitable for legacy designs using active-low reset; lacks DS1706LESA+T&R's precise ±5% tolerance and active-high RST option | Select MAX706ESA+ only if existing schematic uses /RST and ±10% tolerance is acceptable |
| TPS3808G33DBVR | Single-supply 3.3V supervisor; fixed 3.08 V trip (±0.5%), no NMI or ST input; 200 ms reset timeout | Designed for low-voltage microcontrollers only; no watchdog or upstream sensing capability-requires separate NMI logic | Choose TPS3808G33DBVR for cost-sensitive 3.3V-only systems without watchdog or NMI requirements |
Compared with MAX706ESA+, DS1706LESA+T&R offers tighter ±5% VCC tolerance and active-high RST for direct MCU compatibility; versus TPS3808G33DBVR, it delivers full triple-function supervision (power, pushbutton, watchdog) with industrial-grade flexibility and 5V support.
Availability
DS1706LESA+T&R is available at Aetrix Electronics and suitable for industrial control systems, medical devices, telecom infrastructure, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS1706LESA+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 DS1706LESA+T&R belongs to the MicroMonitor™ family-engineered specifically for robust microprocessor supervision in harsh environments, combining power monitoring, watchdog, and reset control in minimal footprint.
FAQ
What is the VCC trip point specification for DS1706LESA+T&R?
The DS1706LESA+T&R has a guaranteed VCC trip point of 4.50 V (minimum), 4.65 V (typical), and 4.75 V (maximum) - corresponding to a ±5% tolerance around 4.65 V nominal. This ensures reliable reset assertion before a 5V system enters unstable operating region. The trip point is temperature-compensated across −40°C to +85°C and applies directly to the DS1706LESA+T&R variant per Maxim's ordering table and DC electrical characteristics.
Does DS1706LESA+T&R provide both active-high and active-low reset outputs?
No - DS1706LESA+T&R provides only RST (active-high reset output) and WDS (active-low watchdog status), not /RST. The "L" suffix in DS1706LESA+T&R explicitly denotes the active-high RST version, distinguishing it from DS1706ESA+T&R which provides /RST. This is confirmed in the Ordering Information table and Pin Description section of the datasheet.
How does the watchdog timer in DS1706LESA+T&R function, and what is its timeout period?
The DS1706LESA+T&R watchdog timer starts counting after RST becomes inactive and times out after 1.0–2.2 seconds (typical 1.6 s). A high-to-low transition on the ST pin resets the timer. Upon timeout, WDS is driven low for ≥130 ms. This behavior is verified in the AC Electrical Characteristics table (tTD parameter) and Operation section, confirming DS1706LESA+T&R's role in detecting software hangs.
Can DS1706LESA+T&R monitor a voltage higher than its VCC supply?
Yes - the IN pin is a high-impedance input referenced to an internal 1.25 V bandgap. Using an external resistor divider, DS1706LESA+T&R can monitor supplies up to 11.88 V (example shown in datasheet Figure 5). The IN pin voltage must not exceed VCC, but the monitored source may be higher, enabling upstream rail supervision without level-shifting components.
Is DS1706LESA+T&R pin-compatible with the MAX705/MAX706 series?
Yes - DS1706LESA+T&R is explicitly stated as pin-compatible with MAX705/MAX706 in 8-pin DIP, SOIC, and µSOP packages. The Pin Assignment diagram confirms identical pin numbering and function mapping for PBRST, VCC, GND, IN, NMI, ST, RST, and WDS. This compatibility is documented in the Features section and supported by identical package codes (ESA = 8-pin SOIC).
DS1706LESA+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SOIC
DS1706LESA+T&R FAQ
1.How can I place an order for DS1706LESA+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1706LESA+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 DS1706LESA+T&R reliable?
The price and inventory of DS1706LESA+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 DS1706LESA+T&R is usually 5 days.
3.What payment methods are accepted for DS1706LESA+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1706LESA+T&R transactions.
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DS1706LESA+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1706LESA+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 DS1706LESA+T&R?
For technical support, including DS1706LESA+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1706LESA+T&R requirements.
6.How does Aetrix verify that DS1706LESA+T&R is sourced from the original manufacturer or authorized distributors?
All DS1706LESA+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 DS1706LESA+T&R meets industry standards.
7.What is the process for return or replacement of DS1706LESA+T&R?
All DS1706LESA+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1706LESA+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 DS1706LESA+T&R part is unused and in its original packaging.
Return procedure for DS1706LESA+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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