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Analog Devices Inc./Maxim Integrated DS1706SESA+
- Part No.:
- DS1706SESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1706SESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:109
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Product details
Overview
DS1706SESA+ from Maxim Integrated is a 3.3V ±10% microprocessor supervisory circuit that monitors VCC, provides pushbutton reset control, and implements a 1-second watchdog timer with NMI early-warning interrupt. It delivers active-low reset (RST), watchdog status (WDS), and non-maskable interrupt (NMI) outputs in an 8-pin SOIC package for industrial embedded systems requiring reliable power-up/power-down sequencing and fault recovery.
For engineers reviewing the DS1706SESA+ datasheet, DS1706SESA+ pinout, DS1706SESA+ application, or DS1706SESA+ equivalent, this page details its precise reset threshold (2.93V typ), 130ms minimum reset pulse width, 1.25V IN-sense reference, watchdog timeout (1.0–2.2s), and compatibility with 3.3V microcontroller power rails and reset architectures.
Technical Context
The DS1706SESA+ integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference and comparator, debounced pushbutton reset with guaranteed 130ms active-low output, and a self-resetting watchdog timer triggered by ST input transitions. Its IN pin accepts externally scaled voltage inputs via resistor divider for upstream power rail monitoring.
It generates two distinct reset signals-active-low RST for processor reset and active-high *RST (not present on DS1706S)-and uses a dedicated NMI output to signal impending power failure at 200μs pulse width with 100μV hysteresis. The WDS output asserts low upon watchdog timeout for system-level fault indication or automatic reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.93V typical (±10% tolerance for 3.3V systems); ensures reset activation before microprocessor brownout. |
| Reset Pulse Width | 130–285ms minimum; guarantees sufficient time for power supply and CPU stabilization during power-up/failure. |
| Watchdog Timeout | 1.0–2.2s; provides configurable window for software heartbeat validation without external timing components. |
| NMI Pulse Width | ≥200μs; delivers early warning of power decay while rejecting noise spikes <2μs. |
| IN Sense Reference | 1.25V ±0.05V; enables accurate monitoring of higher-voltage rails via external resistor divider. |
| Operating Current | 50μA max at VCC < 3.6V; supports ultra-low-power battery-backed or always-on supervision. |
Pinout & Package
DS1706SESA+ is housed in an 8-pin SOIC (150-mil) package with gull-wing leads, RoHS-compliant and lead-free per ordering suffix '+'. Pin assignments are standardized across DS1705/DS1706 family variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up (40kΩ); debounced to guarantee ≥130ms RST assertion on release. |
| VCC | Power Supply | 3.3V nominal input; powers internal comparators, timer, and output drivers; absolute max 7.0V. |
| GND | Ground Reference | Common return path for all analog and digital circuitry; must be low-impedance for noise immunity. |
| IN | Voltage Sense Input | High-impedance (≤1μA leakage); monitors external rail via resistor divider; trip point referenced to 1.25V internal reference. |
| NMI | Non-Maskable Interrupt Output | Open-drain, active-low; pulses ≥200μs when IN voltage falls below threshold; used for preemptive firmware shutdown. |
| ST | Strobe Input | Active-low watchdog trigger; internal pull-up (180kΩ); must be toggled every ≤1.0s to prevent WDS assertion. |
| RST | Reset Output | Active-low open-drain output; drives microprocessor reset line; held active ≥130ms after VCC recovery. |
| WDS | Watchdog Status Output | Active-low open-drain; asserts for ≥130ms upon watchdog timeout; can be connected to PBRST for auto-restart. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-function supervision | Combines VCC monitor, pushbutton reset controller, and watchdog timer in single 8-pin IC-eliminates discrete RC networks and logic gates. |
| Configurable reset threshold | 2.93V typical (±10%) for 3.3V systems ensures compatibility with 3.0V–3.6V microcontrollers without external adjustment. |
| Early-warning NMI | 1.25V IN reference with 100μV hysteresis enables precise, noise-immune detection of upstream power degradation before VCC collapse. |
| Guaranteed reset timing | 130ms minimum RST pulse width is internally generated and temperature-stable-no external capacitor required. |
| Watchdog self-recovery | WDS output can drive PBRST to force hardware reset upon timeout, enabling autonomous system recovery without host intervention. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Continuous operation in factory-floor automation where power transients or ESD events risk MCU lockup. IC Role / Device Role / Timing Role: DS1706SESA+ acts as primary power supervisor and watchdog, asserting RST on VCC dip and generating NMI for graceful I/O shutdown. Use Value: Prevents corrupted data writes during brownout and enables deterministic restart within 130ms-meeting IEC 61000-4-11 immunity requirements. | Use Scenario: Battery-powered portable ultrasound unit requiring fail-safe boot sequence and runtime integrity checks. IC Role / Device Role / Timing Role: DS1706SESA+ monitors main 3.3V rail and triggers NMI at first sign of battery sag, allowing firmware to save critical state before RST activates. Use Value: 50μA quiescent current extends battery life; 1.25V IN reference enables direct monitoring of 12V DC-DC converter output via resistor divider. |
| Telecom Remote Terminal | Smart Energy Meter |
Use Scenario: Unattended outdoor node powered by PoE or solar, subject to voltage sags and software hangs. IC Role / Device Role / Timing Role: DS1706SESA+ serves as watchdog and reset manager-ST driven by UART TX activity, WDS tied to PBRST for auto-reboot on communication stall. Use Value: 1-second watchdog timeout aligns with typical modem keep-alive intervals; eliminates need for external reset IC or microcontroller-based supervision. | Use Scenario: ANSI C12.20-certified meter with tamper detection and secure firmware update requiring verified boot integrity. IC Role / Device Role / Timing Role: DS1706SESA+ provides hardware-enforced reset during power interruption and validates continuous MCU execution via ST strobe from watchdog timer ISR. Use Value: Active-low RST ensures compatibility with meter SoC reset pin; 130ms reset hold satisfies ANSI requirement for stable clock initialization post-power-loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TESA+ | Same 3.3V ±5% trip point, identical 8-pin SOIC footprint, but lacks NMI output and has no IN sense input. | Cannot perform upstream power rail monitoring or early-warning interrupt; limited to local VCC supervision only. | Select MAX706TESA+ only if NMI and IN functionality are unnecessary and tighter 5% reset accuracy is required. |
| TPS3808G12DBVR | TI device with 3.3V ±1.5% threshold, 200ms reset delay, no NMI or IN pin, but includes manual reset input and higher ESD rating (4kV HBM). | Designed for simpler reset-only use cases; no watchdog or early-warning capability-requires separate timer for software health check. | Choose TPS3808G12DBVR when highest reset accuracy and ESD robustness are prioritized over multi-function integration. |
Compared with MAX706TESA+ and TPS3808G12DBVR, DS1706SESA+ uniquely combines VCC monitoring, pushbutton reset, watchdog timer, and NMI/IN sensing in one 8-pin SOIC-enabling full-system supervision without additional ICs or layout area.
Availability
DS1706SESA+ is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, telecom infrastructure, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS1706SESA+ 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 demanding industrial, automotive, and communications applications.
The DS1706SESA+ belongs to the MicroMonitor™ family-engineered specifically for robust microprocessor supervision in harsh environments where power reliability and deterministic fault recovery are critical.
FAQ
What is the exact VCC reset threshold voltage for DS1706SESA+?
The DS1706SESA+ has a guaranteed VCC trip point of 2.85V (min), 2.93V (typ), and 3.00V (max) - corresponding to a ±10% tolerance around 3.3V. This threshold is internally trimmed and temperature-compensated, ensuring consistent reset behavior across the -40°C to +85°C industrial range without external calibration. The DS1706SESA+ datasheet specifies these values under DC Electrical Characteristics.
Does DS1706SESA+ provide both active-high and active-low reset outputs?
No, DS1706SESA+ provides only an active-low reset output (RST). The active-high *RST output is available only on DS1706L and DS1706P variants. DS1706SESA+ is specifically configured for /RST and /WDS operation per its ordering code "S" (3.3V-10% MONITOR, /RST, /WDS), confirmed in the Maxim ordering information table.
Can DS1706SESA+ monitor a 5V supply rail?
No, DS1706SESA+ is designed exclusively for 3.3V systems with ±10% tolerance. To monitor a 5V rail, use DS1706E variants (e.g., DS1706EPA+) which feature a 4.25–4.50V trip point. However, DS1706SESA+ can supervise higher voltages indirectly via its IN pin using an external resistor divider scaled to 1.25V - enabling monitoring of 5V, 12V, or other rails without exceeding VCC.
How does the watchdog timer in DS1706SESA+ interact with the reset function?
The DS1706SESA+ watchdog timer asserts the WDS output low upon timeout (1.0–2.2s), but does not directly assert RST. However, WDS can be externally connected to the PBRST pin to trigger a guaranteed 130ms reset pulse - enabling autonomous system recovery. This linkage is explicitly documented in Figure 3 of the DS1706 datasheet and is a validated design technique for unattended reboot scenarios.
Is DS1706SESA+ pin-compatible with MAX705/MAX706 devices?
Yes, DS1706SESA+ is pin-compatible with the MAX705/MAX706 in 8-pin DIP, SOIC, and µSOP packages as stated in the features list. All signal names (RST, WDS, NMI, ST, PBRST, IN, VCC, GND), pin positions, and electrical behavior match - allowing drop-in replacement in existing MAX705/706 designs, provided the reset threshold (2.93V vs. 4.40V) and feature set (NMI/IN presence) meet system requirements.
DS1706SESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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-SOIC
DS1706SESA+ FAQ
1.How can I place an order for DS1706SESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1706SESA+ 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 DS1706SESA+ reliable?
The price and inventory of DS1706SESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1706SESA+ is usually 5 days.
3.What payment methods are accepted for DS1706SESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1706SESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1706SESA+?
DS1706SESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1706SESA+ 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 DS1706SESA+?
For technical support, including DS1706SESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1706SESA+ requirements.
6.How does Aetrix verify that DS1706SESA+ is sourced from the original manufacturer or authorized distributors?
All DS1706SESA+ 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 DS1706SESA+ meets industry standards.
7.What is the process for return or replacement of DS1706SESA+?
All DS1706SESA+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1706SESA+, 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 DS1706SESA+ part is unused and in its original packaging.
Return procedure for DS1706SESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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