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Analog Devices Inc./Maxim Integrated DS1705ESA
- Part No.:
- DS1705ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1705ESA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,802
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Product details
Overview
DS1705ESA from Maxim Integrated is a 5V ±5% microprocessor supervisory circuit that monitors VCC, provides pushbutton reset debouncing, and delivers non-maskable interrupt (NMI) and watchdog timer functions. It features 130 ms minimum reset pulse width, 1.25 V precision voltage sense input, and operates across -40°C to +85°C in 8-pin SOIC packaging for embedded microcontroller power integrity.
For engineers reviewing the DS1705ESA datasheet, DS1705ESA pinout, DS1705ESA application, or DS1705ESA equivalent, this page delivers verified technical context, exact pin roles, industrial-grade timing behavior, and validated alternatives for 5V system reset and watchdog design.
Technical Context
The DS1705ESA integrates three independent monitoring functions: (1) VCC supply monitoring with 4.65 V typical trip point and 130–285 ms active-low reset assertion; (2) high-impedance IN pin sensing at 1.25 V reference for early power-fail warning via NMI output; and (3) 1.0–2.2 s watchdog timeout triggered by ST strobe absence, with WDS active-low status output.
Its internal architecture includes temperature-compensated bandgap reference, comparator hysteresis (100 µV), noise immunity (<2 µs rejection), and internal pull-ups (40 kΩ on PBRST, 180 kΩ on ST). All logic outputs are CMOS-compatible with 10 mA sink capability on RST and 350 µA source drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.65 V typical; ensures reliable reset activation before 5V rail collapse below processor minimum operating voltage. |
| Reset Pulse Width | 130–285 ms; guarantees sufficient time for power supply and microprocessor stabilization after power-up or recovery. |
| IN Sense Voltage | 1.25 V ±0.05 V; enables flexible upstream voltage monitoring via external resistor divider for early fault detection. |
| Watchdog Timeout | 1.0–2.2 s; provides configurable software execution supervision with ST input requiring high-to-low transition every second. |
| NMI Pulse Width | ≥200 µs; delivers deterministic early-warning interrupt before reset, allowing controlled shutdown routines. |
| Operating Current | 50–60 µA; supports low-power embedded systems without compromising supervision reliability. |
| Temperature Range | -40°C to +85°C; qualified for industrial environments where thermal stability of reset timing is critical. |
Pinout & Package
DS1705ESA is housed in an 8-pin SOIC (150-mil) package per package code S8-2, with gull-wing leads and JEDEC MS-012AC compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up to VCC (40 kΩ); debounced to guarantee ≥130 ms RST pulse on release. |
| VCC | Power Supply | 5.0 V ±5% input; powers all internal circuits and defines reference for trip thresholds and I/O levels. |
| GND | Ground Reference | System ground return path for analog comparators, digital logic, and output drivers. |
| IN | Voltage Sense Input | High-impedance (≤1 µA leakage) input referenced to 1.25 V internal bandgap; used for custom power-rail monitoring. |
| NMI | Non-Maskable Interrupt Output | Active-low, open-drain; pulses ≥200 µs when IN falls below 1.25 V, enabling preemptive firmware response. |
| ST | Strobe Input | Active-low watchdog trigger; requires high-to-low transition within 1.0–2.2 s to prevent WDS assertion. |
| RST | Active-Low Reset Output | CMOS-compatible, 10 mA sink capability; asserts during VCC undervoltage, power-up, or PBRST activation. |
| WDS | Watchdog Status Output | Active-low, open-drain; driven low for ≥130 ms if ST strobe is missed, signaling software hang. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-function supervision | Simultaneous VCC monitoring, pushbutton reset control, and watchdog timer eliminate need for discrete supervisors or timers. |
| Programmable sense point | IN pin accepts user-defined voltage dividers, enabling early detection of upstream supply faults before VCC collapse. |
| Noise-immune NMI generation | 5 µs minimum IN low-time requirement and 100 µV hysteresis prevent false interrupts from power supply ripple or transients. |
| Guaranteed reset timing | 130 ms minimum RST assertion ensures microprocessor reset completion even under slow-rising VCC conditions. |
| Pin compatibility with MAX705/MAX706 | Direct replacement in existing 8-pin DIP/SOIC/µSOP layouts reduces redesign effort for legacy Maxim-based designs. |
Applications
| Industrial PLC Controller | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with fluctuating 5V supplies. IC Role / Device Role / Timing Role: DS1705ESA acts as primary power supervisor, asserting RST during brownouts and generating NMI for graceful I/O state preservation. Use Value: Prevents corrupted ladder logic execution and ensures deterministic restart after transient grid disturbances. | Use Scenario: Portable ultrasound unit with battery-backed 5V rail and safety-critical boot sequence. IC Role / Device Role / Timing Role: DS1705ESA monitors main 5V supply and triggers NMI for emergency data save before RST assertion during battery depletion. Use Value: Enables lossless capture of last valid scan frame prior to full system reset, meeting IEC 62304 safety requirements. |
| Automotive Infotainment Head Unit | Network Edge Router |
Use Scenario: In-vehicle infotainment system powered from vehicle 12V via 5V DC-DC converter subject to load dump and cold crank. IC Role / Device Role / Timing Role: DS1705ESA provides dual-stage fault response: NMI for firmware-initiated safe shutdown, then RST for hardware reset upon sustained undervoltage. Use Value: Avoids EEPROM corruption during engine start cycles by decoupling warning and reset actions with precise timing separation. | Use Scenario: Carrier-grade Ethernet router with multi-core ARM processor requiring guaranteed boot integrity after AC power interruption. IC Role / Device Role / Timing Role: DS1705ESA supervises 5V core supply and uses ST input tied to CPU timer interrupt to detect kernel lockup. Use Value: Restores network forwarding within 2.2 s of software hang without manual intervention, maintaining SLA uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705ESA | Identical pinout, same 4.65 V VCC trip, but lacks WDS watchdog status output; only provides RST and NMI. | Suitable for simpler systems needing only power monitoring and NMI, without software-execution supervision. | Select MAX705ESA if watchdog functionality is unnecessary and BOM cost reduction is prioritized. |
| TPS3808G18DBVR | 3.3V-only device with 1.8V threshold; no NMI output; fixed 200 ms reset delay; no ST/WDS watchdog function. | Designed for low-voltage SoC applications; incompatible with 5V systems or NMI-driven shutdown sequences. | Choose TPS3808G18DBVR only for new 3.3V/1.8V designs where DS1705ESA's 5V operation and triple-function capability are not required. |
Compared with MAX705ESA, DS1705ESA adds watchdog status reporting (WDS) for software hang detection; compared with TPS3808G18DBVR, it supports 5V operation, provides NMI for early warning, and offers field-programmable sense-point monitoring via IN.
Availability
DS1705ESA is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive infotainment, and network infrastructure applications requiring stable component supply and long-term lifecycle support.
Supply support for DS1705ESA 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, communications, and computing markets.
The DS1705ESA belongs to the MicroMonitor family-engineered specifically for robust microprocessor supervision in harsh environments where simultaneous power, software, and user-input fault detection is mandatory.
FAQ
What is the VCC trip voltage specification for DS1705ESA?
The DS1705ESA has a VCC trip point of 4.65 V typical, with a guaranteed range of 4.50 V to 4.75 V at -40°C to +85°C. This 5% tolerance (±0.23 V) ensures reliable reset activation before a 5V microprocessor enters undefined operation. The DS1705ESA uses an internal temperature-compensated bandgap reference to maintain accuracy across its full industrial temperature range.
Does DS1705ESA provide both active-high and active-low reset outputs?
No, DS1705ESA provides only an active-low reset output (RST). Unlike some variants in the DS1706 family (e.g., DS1706LESA), the DS1705ESA does not include an active-high RST output. Its RST pin is CMOS-compatible with 10 mA sink current capability and a minimum 130 ms assertion time during power-up or fault conditions.
How does the DS1705ESA watchdog timer function work?
The DS1705ESA watchdog timer starts timing after RST becomes inactive. If the ST input does not receive a high-to-low transition within 1.0–2.2 s, the WDS output is driven active-low for ≥130 ms. This mechanism detects software hangs by requiring periodic CPU-generated strobes-commonly tied to address, data, or control lines-and forces system recovery without external intervention.
Can DS1705ESA monitor voltages other than VCC?
Yes, DS1705ESA can monitor external voltages via its IN pin, which compares the applied voltage against a precise 1.25 V internal reference. Using an external resistor divider, users can scale higher voltages (e.g., 12V, 24V) down to the 1.25 V threshold. The DS1705ESA datasheet provides the formula VSENSE = (R2/(R1+R2)) × 1.25 V to calculate appropriate resistor values for custom sense points.
Is DS1705ESA pin-compatible with other Maxim supervisory ICs?
Yes, DS1705ESA is pin-compatible with the MAX705/MAX706 series in 8-pin DIP, SOIC, and µSOP packages. This allows direct substitution in existing layouts without PCB changes. However, functional differences exist-DS1705ESA includes WDS watchdog status output while MAX705ESA does not-so firmware and schematic review is required before drop-in replacement.
DS1705ESA 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:
- 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 Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1705ESA FAQ
1.How can I place an order for DS1705ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1705ESA 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 DS1705ESA reliable?
The price and inventory of DS1705ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1705ESA is usually 5 days.
3.What payment methods are accepted for DS1705ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1705ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1705ESA?
DS1705ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1705ESA 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 DS1705ESA?
For technical support, including DS1705ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1705ESA requirements.
6.How does Aetrix verify that DS1705ESA is sourced from the original manufacturer or authorized distributors?
All DS1705ESA 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 DS1705ESA meets industry standards.
7.What is the process for return or replacement of DS1705ESA?
All DS1705ESA units undergo pre-shipment inspection (PSI). If there is an issue with DS1705ESA, 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 DS1705ESA part is unused and in its original packaging.
Return procedure for DS1705ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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