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Analog Devices Inc./Maxim Integrated MAX705ESA+T
- Part No.:
- MAX705ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX705ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,064
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Product details
Overview
The MAX705ESA+T from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output, 1.6s watchdog timeout, 4.65V supply-voltage monitoring, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot-up and brownout recovery in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX705ESA+T datasheet, MAX705ESA+T pinout, MAX705ESA+T application, or MAX705ESA+T equivalent, this page delivers verified functional identity, temperature-rated operating parameters (–40°C to +85°C), true reset pulse width (200ms), watchdog timing behavior, and validated alternative parts for μP power-monitoring designs.
Technical Context
The MAX705ESA+T integrates four core supervisory functions: a voltage-monitoring reset generator with 4.65V threshold and 40mV hysteresis, a 1.6s watchdog timer that triggers WDO on missing WDI edges, a 1.25V reference-based power-fail comparator driving PFO, and a TTL/CMOS-compatible MR input with internal 250μA pull-up and 150ns minimum pulse width.
Its RESET output remains valid down to VCC = 1V (guaranteed ≤0.3V at ISINK = 50μA), and all outputs are rail-to-rail compatible with 5V systems. The device operates across VCC = 1.0V to 5.5V and draws only 150–350μA typical supply current, enabling use in battery-backed and low-power μP systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reset assertion before +5V supply drops below safe μP operating margin |
| Reset Pulse Width | 200ms nominal - meets Intel 80C51 and similar μP minimum reset hold-time requirements |
| Watchdog Timeout | 1.6s ±0.65s - provides sufficient window for firmware housekeeping without false timeouts |
| Power-Fail Input Threshold | 1.25V ±50mV - enables accurate early-warning detection of +5V regulator dropout via external divider |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and guarantees RESET validity at 1V |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments |
| Package | 8-pin SO (Small Outline) - RoHS-compliant, surface-mountable, footprint-compatible with industry-standard 8SO layouts |
Pinout & Package
MAX705ESA+T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead-free construction (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250μA pull-up enables switch or logic-line drive; debounced by ≥140ms reset pulse |
| 2 (VCC) | Positive Supply Input | +5V (or 1.0–5.5V) main power rail; powers all internal comparators, timer, and outputs |
| 3 (GND) | Ground Reference | 0V return for all analog and digital circuitry; must be low-impedance for stable reset threshold accuracy |
| 4 (PFI) | Power-Fail Input | Comparator inverting input referenced to 1.25V; monitors external voltage dividers for early power-loss warning |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V - used for μP interrupt or backup switchover control |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling required within 1.6s to prevent WDO assertion; floating disables watchdog |
| 7 (RESET) | Active-Low Reset Output | Push-pull output; guaranteed low (≤0.4V) at ISINK = 3.2mA; pulses low for 200ms on power-up/brownout/manual trigger |
| 8 (WDO) | Watchdog Output | Open-drain active-low output; asserts when watchdog times out or VCC falls below reset threshold; no minimum pulse width |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables fail-safe reset assertion even during severe brownout - critical for nonvolatile memory write protection |
| Integrated 1.25V precision reference | Allows accurate, temperature-stable power-fail detection across –40°C to +85°C without external components |
| Debounced manual-reset input | Eliminates need for external RC filtering or Schmitt-trigger logic - reduces BOM count and board space |
| Watchdog timeout with edge-triggered clear | Prevents spurious resets from noise; rising/falling edges on WDI fully reset timer - robust against signal glitches |
| Separate PFO and WDO outputs | Enables independent handling of power-fail interrupts and watchdog faults - avoids conflict in NMI-driven systems |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers exposed to fluctuating 24V DC rails and EMI-rich factory environments. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during brownout, triggering orderly shutdown via PFO interrupt, and verifying firmware liveness via WDI. Use Value: Prevents corrupted I/O state and EEPROM writes during undervoltage events - maintains SIL-2 functional safety compliance. |
Use Scenario: Ensuring deterministic boot and runtime integrity in portable ultrasound and patient monitor systems with Li-ion backup. IC Role / Device Role / Timing Role: Monitoring main +5V rail and battery voltage via PFI divider; generating 200ms RESET pulse to initialize ARM Cortex-M4 processor. Use Value: Guarantees μP enters known state before ADC/DAC initialization - eliminates startup data corruption in time-critical imaging pipelines. |
| Telecom Remote Terminal Unit | Smart Energy Meter |
|
Use Scenario: Maintaining uptime in outdoor RTUs powered by solar-charged batteries and subject to wide-temperature cycling. IC Role / Device Role / Timing Role: Providing –40°C to +85°C reset supervision, detecting low-battery condition via PFI, and resetting communication stack on watchdog timeout. Use Value: Extends field lifetime by preventing hung modems and ensuring periodic re-synchronization - reduces remote maintenance calls. |
Use Scenario: Securing meter firmware execution and tamper-resilient data logging under unstable AC-derived +5V supplies. IC Role / Device Role / Timing Role: Asserting RESET during line sags, using PFO to trigger flash write completion before power loss, and validating firmware heartbeat via WDI. Use Value: Meets ANSI C12.1 and IEC 62056-21 requirements for nonvolatile event logging integrity during power interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706ESA+T | 4.40V reset threshold (vs. 4.65V); identical pinout, timing, and feature set | Better suited for systems with tighter +5V tolerance or lower-noise regulators where earlier reset assertion is needed | Select MAX706ESA+T when VCC droop must trigger reset at 4.40V rather than 4.65V - no layout change required |
| MAX813LESA+T | Active-high RESET output only (no active-low RESET); same 4.65V threshold, 1.6s watchdog, and PFI/PFO functions | Required for μPs with active-high reset inputs (e.g., Intel 80C51), eliminating need for external inverter | Choose MAX813LESA+T when system design mandates active-high reset polarity - direct functional replacement with same footprint |
Compared with MAX705ESA+T, MAX706ESA+T offers earlier reset assertion for marginal supplies, while MAX813LESA+T removes the active-low RESET output to simplify interface with legacy μPs - both retain full watchdog, PFI, and MR functionality in the same SO-8 package.
Availability
MAX705ESA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and smart energy meters requiring stable component supply across extended temperature ranges.
Supply support for MAX705ESA+T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX705–MAX708/MAX813L family was designed specifically to replace discrete reset generators and watchdog circuits in cost-sensitive, space-constrained μP systems - delivering integrated reliability with minimal external components.
FAQ
What is the reset threshold voltage of the MAX705ESA+T?
The MAX705ESA+T has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature. This means RESET asserts when VCC falls below approximately 4.50V and releases after VCC rises above ~4.75V, providing hysteresis to prevent chatter near the trip point. The threshold is factory-trimmed and guaranteed across –40°C to +85°C operation.
Does the MAX705ESA+T support operation below 5V supply?
Yes, the MAX705ESA+T operates from VCC = 1.0V to 5.5V. Its RESET output remains valid down to VCC = 1V (guaranteed ≤0.3V at 50μA sink), making it suitable for brownout detection in battery-powered or multi-rail systems. However, the 4.65V reset function only activates when VCC exceeds ~1.5V - below that, RESET is high-impedance.
How does the watchdog timer in the MAX705ESA+T work?
The MAX705ESA+T watchdog timer requires a rising or falling edge on WDI at least once every 1.6 seconds (±0.65s). If no edge occurs, WDO goes low. The timer clears on any RESET assertion, WDI three-state, or WDI edge. Pulses as short as 50ns are detected - enabling robust firmware heartbeat monitoring without tight timing constraints.
Can the MAX705ESA+T monitor voltages other than +5V?
Yes, the MAX705ESA+T's PFI pin accepts any voltage referenced to GND. By connecting a resistor divider from a target supply (e.g., +12V or –5V) to PFI, the 1.25V internal comparator detects when that supply crosses its threshold. Application circuits in the datasheet show how to configure PFI for positive, negative, or battery-supply monitoring with optional hysteresis.
Is the MAX705ESA+T pin-compatible with other devices in the MAX705–MAX708 family?
Yes, the MAX705ESA+T shares identical 8-pin SO pinout with MAX706ESA+T, MAX707ESA+T, MAX708ESA+T, and MAX813LESA+T. All variants maintain the same MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO assignments. Differences are internal (reset threshold, output polarity, watchdog presence) - allowing drop-in substitution where function matches.
MAX705ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX705ESA+T FAQ
1.How can I place an order for MAX705ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705ESA+T 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 MAX705ESA+T reliable?
The price and inventory of MAX705ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705ESA+T is usually 5 days.
3.What payment methods are accepted for MAX705ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705ESA+T?
MAX705ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705ESA+T 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 MAX705ESA+T?
For technical support, including MAX705ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705ESA+T requirements.
6.How does Aetrix verify that MAX705ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX705ESA+T 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 MAX705ESA+T meets industry standards.
7.What is the process for return or replacement of MAX705ESA+T?
All MAX705ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX705ESA+T, 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 MAX705ESA+T part is unused and in its original packaging.
Return procedure for MAX705ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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