My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS1705EUA
- Part No.:
- DS1705EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1705EUA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,763
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS1705EUA from Maxim Integrated is a 5V ±5% precision microprocessor supervisory circuit with active-low reset (/RST), watchdog status output (/WDS), non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC, senses upstream supply voltage via IN pin, and provides 130 ms minimum reset pulse width. Used in embedded industrial controllers to ensure reliable power-up sequencing and fault recovery.
For engineers reviewing the DS1705EUA datasheet, DS1705EUA pinout, DS1705EUA application, or DS1705EUA equivalent, key selection criteria include its 4.65 V typical VCC trip point, 1.25 V IN-sense reference, 1 s watchdog timeout, -40°C to +85°C operation, and µSOP-8 package compatibility with legacy MAX705/MAX706 designs.
Technical Context
The DS1705EUA integrates three independent monitoring functions: power supply supervision (VCC detection at 4.65 V ±2.5%), external voltage sensing (IN pin referenced to 1.25 V bandgap), and watchdog timer (1 s timeout triggered by ST input). All outputs are TTL/CMOS compatible with guaranteed timing margins.
Its internal comparator architecture includes hysteresis on NMI (100 µV) and noise immunity against <2 µs transients at VCCTP. The PBRST input is internally pulled up (40 kΩ typical), debounced, and guarantees ≥130 ms /RST assertion upon button release - no external RC required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.65 V typical; ensures reset activation before 5V system brownout affects CPU operation |
| Reset Pulse Width | 130–285 ms; meets Intel-compatible reset timing requirements for stable power-up |
| Watchdog Timeout | 1.0–2.2 s; allows sufficient software execution window before forced recovery |
| IN Sense Reference | 1.25 V ±0.05 V; enables accurate monitoring of higher-voltage rails via resistor divider |
| Operating Current | 60 µA max at VCC < 5.5 V; supports low-power battery-backed systems |
| Temperature Range | -40°C to +85°C; qualified for industrial-grade embedded control environments |
| Package | 8-pin µSOP (118-mil); footprint-compatible with SOIC-8 and DIP-8 variants for design reuse |
Pinout & Package
DS1705EUA is housed in an 8-pin µSOP (118-mil) package with gull-wing leads, 0.5 mm pitch, and JEDEC MO-187AC compliance. Thermal pad optional; RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up (40 kΩ); debounced to generate ≥130 ms /RST on release |
| VCC | Power Supply Input | Primary 5V supply rail; trip point set at 4.65 V ±2.5% for 5V-5% monitoring |
| GND | Ground Reference | Common return path for all analog and digital circuits; decoupling capacitor required |
| IN | External Voltage Sense Input | High-impedance (≤1 µA leakage); accepts divided rail voltage referenced to 1.25 V internal bandgap |
| NMI | Non-Maskable Interrupt Output | Active-low pulse ≥200 µs; signals early power failure before /RST asserts |
| ST | Strobe Input | Watchdog trigger; high-to-low transition resets 1 s timeout counter |
| /RST | Active-Low Reset Output | Open-drain, 10 mA sink capability; asserts for ≥130 ms on power-up or fault |
| /WDS | Watchdog Status Output | Active-low open-drain; pulses low for ≥130 ms if ST not strobed within timeout |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Function Supervision | Simultaneous VCC monitoring, external rail sensing (IN), and watchdog timer - eliminates need for discrete supervisors |
| Guaranteed Reset Timing | 130 ms minimum /RST assertion ensures processor stabilization across full temperature range |
| Early Warning NMI | 1.25 V reference + hysteresis enables precise upstream power fail detection with noise immunity |
| Pushbutton Debounce | No external components needed; internal logic guarantees clean 130 ms reset pulse on mechanical switch release |
| Pin Compatibility | Direct replacement for MAX705/MAX706 in µSOP-8, SOIC-8, and DIP-8 footprints - no PCB redesign required |
Applications
| Industrial PLC Controller | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Power cycling during firmware updates in programmable logic controllers with isolated I/O modules. IC Role / Device Role / Timing Role: DS1705EUA acts as primary power supervisor, asserting /RST until 5V rail stabilizes and generating NMI for graceful shutdown sequence initiation. Use Value: Prevents corrupted register writes during brownout by halting CPU before VCC drops below 4.65 V, ensuring deterministic state recovery. |
Use Scenario: Battery-backed data acquisition in portable ultrasound units requiring fail-safe boot integrity. IC Role / Device Role / Timing Role: DS1705EUA monitors main 5V DC-DC output and triggers watchdog reset if ADC firmware hangs during sensor calibration. Use Value: 1 s watchdog timeout aligns with real-time processing deadlines; /WDS pulse forces hardware reset without host intervention. |
| Telecom Remote Terminal Unit | Automotive Infotainment Gateway |
Use Scenario: Field-deployed RTUs exposed to wide ambient temperature swings and ESD events on RS-485 lines. IC Role / Device Role / Timing Role: DS1705EUA provides robust reset generation using IN pin to monitor upstream 12V-to-5V converter output, decoupled from local VCC noise. Use Value: 1.25 V sense reference enables accurate 12V rail monitoring with <1% error; hysteresis prevents false NMI from line transients. |
Use Scenario: In-vehicle infotainment head unit with multi-core SoC requiring coordinated power sequencing after ignition-on. IC Role / Device Role / Timing Role: DS1705EUA generates synchronized /RST and NMI signals to halt CPU execution and initiate safe memory dump before full power collapse. Use Value: Dual-reset capability (NMI for software-initiated save, /RST for hard power fail) enables differentiated fault response strategies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705ESA | Same 5V-5% trip point (4.65 V), identical pinout and µSOP-8 package; slightly higher ICC (80 µA vs. 60 µA) | Legacy Maxim part with identical functional scope but older process node; no IN pin hysteresis spec provided | Select DS1705EUA for lower quiescent current and documented IN hysteresis - critical for noisy automotive power rails |
| TPS3808G18DBVR | Fixed 1.8V reset threshold; requires external resistor network to emulate 4.65 V trip; no NMI or ST inputs | Lacks watchdog and early-warning interrupt; suitable only for basic reset-only use cases | Choose DS1705EUA when triple-function integration (reset + NMI + watchdog) and 5V-specific accuracy are mandatory |
Compared with MAX705ESA and TPS3808G18DBVR, DS1705EUA uniquely combines 5V-5% precision reset, NMI-based early warning, and 1 s watchdog in a single µSOP-8 device - enabling compact, fail-safe supervision without external components or compromise on timing fidelity.
Availability
DS1705EUA is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and telecom infrastructure applications requiring stable component supply, long-term lifecycle support, and drop-in compatibility with legacy Maxim supervisory designs.
Supply support for DS1705EUA 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 markets, with emphasis on reliability and integration.
The DS1705EUA belongs to the MicroMonitor™ family - engineered specifically for microprocessor supervision in harsh environments where deterministic reset behavior, early power-fail warning, and watchdog safety are non-negotiable.
FAQ
What is the exact VCC trip point tolerance for DS1705EUA?
The DS1705EUA has a guaranteed VCC trip point of 4.65 V ±2.5% (4.50 V to 4.75 V) over the full -40°C to +85°C operating range. This 5% tolerance is factory-trimmed and tested per datasheet Section 8, ensuring consistent reset activation across temperature and process variation. DS1705EUA's specification matches the "5V-5% MONITOR" designation in the Ordering Information table.
Does DS1705EUA support both active-high and active-low reset outputs?
No, DS1705EUA provides only an active-low reset output (/RST) and active-low watchdog status (/WDS). Unlike DS1706L or DS1706P variants, DS1705EUA does not include an active-high RST output. Its pinout and function set are fixed per the "5V-5% MONITOR, /RST, /WDS" version definition in the Ordering Information table.
Can DS1705EUA monitor a 12V supply rail?
Yes, DS1705EUA can monitor a 12V rail using the IN pin with an external resistor divider. The internal 1.25 V reference sets the trip point; for 12V monitoring, R1 = 26 kΩ and R2 = 10 kΩ yields VSENSE = 4.50 V at trip, allowing safe scaling. The datasheet explicitly states VMAX = (VSENSE / VTP) × VCC, confirming 12V compatibility when VCC = 3.3V or 5V.
What is the watchdog timeout accuracy of DS1705EUA?
The DS1705EUA watchdog timeout is specified as 1.0–2.2 s over temperature and supply voltage. The minimum timeout is 1.0 s, tested at 4.5V for 5V devices, providing a deterministic upper bound for software recovery time. This range accounts for process variation but ensures the watchdog will never expire earlier than 1.0 s - critical for meeting real-time deadlines in DS1705EUA-based systems.
Is DS1705EUA pin-compatible with MAX705 in µSOP-8 packages?
Yes, DS1705EUA is explicitly stated as pin-compatible with MAX705/MAX706 in 8-pin µSOP (118-mil), SOIC (150-mil), and DIP (300-mil) packages. Pin assignments, electrical characteristics, and timing parameters match identically per the "PIN ASSIGNMENT" and "ORDERING INFORMATION" sections - enabling direct substitution without layout changes.
DS1705EUA 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 Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
DS1705EUA FAQ
1.How can I place an order for DS1705EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1705EUA 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 DS1705EUA reliable?
The price and inventory of DS1705EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1705EUA is usually 5 days.
3.What payment methods are accepted for DS1705EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1705EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1705EUA?
DS1705EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1705EUA 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 DS1705EUA?
For technical support, including DS1705EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1705EUA requirements.
6.How does Aetrix verify that DS1705EUA is sourced from the original manufacturer or authorized distributors?
All DS1705EUA 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 DS1705EUA meets industry standards.
7.What is the process for return or replacement of DS1705EUA?
All DS1705EUA units undergo pre-shipment inspection (PSI). If there is an issue with DS1705EUA, 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 DS1705EUA part is unused and in its original packaging.
Return procedure for DS1705EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1705EUA Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
