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Analog Devices Inc./Maxim Integrated MAX708ESA
- Part No.:
- MAX708ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708ESA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:9,562
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Product details
Overview
The MAX708ESA from Maxim Integrated is an industrial-grade microprocessor supervisory circuit in 8-pin SO package, providing active-high reset output, 4.40V supply-voltage monitoring threshold, 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot-up and brownout recovery in embedded controllers and intelligent instrumentation.
For engineers reviewing the MAX708ESA datasheet, MAX708ESA pinout, MAX708ESA application, or MAX708ESA equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior (200ms reset pulse width, 250ns MR-to-RESET delay), voltage-monitoring accuracy (±150mV hysteresis), and validated alternative options for critical μP power monitoring designs.
Technical Context
The MAX708ESA integrates a precision bandgap-based voltage monitor with 4.40V reset threshold and 40mV hysteresis, a 1.6s monostable watchdog timer cleared by WDI edge transitions, and a 1.25V reference-comparator for external power-fail or low-battery detection. Its RESET output remains valid down to VCC = 1.2V, supporting brownout resilience in industrial systems.
Unlike the MAX705/MAX706 series, the MAX708ESA substitutes the watchdog output (WDO) with an active-high RESET output - eliminating need for external inversion while retaining MR-triggered reset assertion, PFI-driven PFO alerting, and guaranteed logic-level compatibility with TTL/CMOS inputs across –40°C to +85°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset during brownout when +5V rail drops below safe operating level |
| Reset Pulse Width | 200ms nominal - ensures μP completes full initialization before release from reset state |
| Watchdog Timeout | 1.6s ±650ms - detects software lockup if WDI is not toggled within defined window |
| Power-Fail Input Threshold | 1.25V ±50mV - enables early warning of supply degradation via external resistor divider |
| Supply Current | 50–500µA - ultra-low quiescent draw supports battery-backed or energy-sensitive applications |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Reset Output Type | Active-high (RESET) - directly interfaces with μPs requiring high-asserted reset (e.g., 80C51) |
Pinout & Package
MAX708ESA is housed in an 8-pin Small Outline (SO) package, RoHS-compliant, with 1.27mm lead pitch and surface-mount footprint per outline S8+2 (Maxim document 21-0041). Thermal dissipation rating is 471mW at +70°C, derating 5.88mW/°C above ambient.
| 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 |
| 2 VCC | +5V Supply Input | Operates from 1.2V to 5.5V; RESET valid down to VCC = 1.2V |
| 3 GND | Ground Reference | Common return for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-Fail Input | Monitors external voltage via 1.25V comparator; connects to resistor divider for custom thresholds |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V - used for NMI or system alert |
| 6 RESET | Active-High Reset Output | Push-pull CMOS output; asserts high for ≥200ms on power-up, brownout, or MR activation |
| 7 WDO | Watchdog Output | Open-drain active-low output; goes low after 1.6s WDI inactivity - can be tied to MR for auto-reset |
| 8 N.C. | No Connect | Internally unconnected; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1.2V | Enables robust reset assertion even during deep brownout conditions before full rail collapse |
| Debounced MR input with 150ns minimum pulse width | Eliminates mechanical switch bounce without external RC filtering |
| 1.25V precision reference for PFI comparator | Supports accurate power-fail detection on non-5V rails (e.g., +12V via divider) with ±50mV tolerance |
| 40mV reset threshold hysteresis | Prevents oscillatory reset assertion near trip point during slow-ramping supply conditions |
| Watchdog timer cleared by rising/falling WDI edges | Allows flexible software supervision using short pulses (≥50ns), not just level toggling |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers exposed to fluctuating 24V DC supplies. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M7 core during brownout, while PFO interrupts MCU to save state before shutdown. Use Value: Prevents corrupted firmware execution and EEPROM writes during unstable line conditions, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Ensuring deterministic boot and runtime integrity in portable ultrasound imaging devices with dual Li-ion battery backup. IC Role / Device Role / Timing Role: Monitoring main +5V rail and battery voltage via PFI; generating early low-battery warning via PFO while maintaining RESET until safe shutdown. Use Value: Enables >200ms controlled data flush and display freeze prior to power loss - critical for FDA Class II device reliability compliance. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Cold-cranking resilience in vehicle body electronics subjected to 5V rail sag below 4.0V during engine start. IC Role / Device Role / Timing Role: Providing fail-safe reset to Infineon AURIX TC3xx microcontroller using 4.40V threshold and 200ms pulse width. Use Value: Guarantees deterministic reinitialization after cranking-induced brownout without requiring external reset supervisor IC. |
Use Scenario: Maintaining metrology accuracy and tamper-proof logging during AC mains interruption in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Detecting AC dropout via PFI-connected transformer secondary; asserting RESET to TI MSP430FR5994 while switching to supercap backup. Use Value: Achieves <10ms switchover latency and preserves last-read kWh value in FRAM - satisfying ANSI C12.1 and IEC 62053-21 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707ESA | Same 4.40V reset threshold and SO-8 package, but includes both active-high RESET and active-low RESET outputs | Required where legacy μP designs need simultaneous high- and low-active reset signals | Select MAX707ESA only if dual-output capability is mandatory; otherwise MAX708ESA offers identical supervision with smaller BOM count |
| MAX809SEUR+T | Single-function reset IC (no watchdog, no PFI/PFO); 4.40V threshold; SOT23-3 package | Suitable for space-constrained designs where only basic reset generation is needed | Choose MAX809SEUR+T only when watchdog and power-fail features are omitted; MAX708ESA provides full feature set in same SO-8 footprint |
Compared with MAX707ESA, MAX708ESA reduces pin count and simplifies routing by omitting redundant RESET; versus MAX809SEUR+T, it adds watchdog supervision and power-fail detection - enabling higher system reliability without increasing board area.
Availability
MAX708ESA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX708ESA 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, medical, and communications applications, emphasizing high reliability and integration density.
The MAX705–MAX708/MAX813L product line delivers cost-optimized, single-chip μP supervision - targeting embedded systems needing guaranteed reset assertion, watchdog safety, and power-fail warning without external components.
FAQ
What is the reset threshold voltage for MAX708ESA and how tightly is it specified?
The MAX708ESA has a nominal reset threshold of 4.40V, with guaranteed limits of 4.25V (minimum) and 4.50V (maximum) over the full –40°C to +85°C operating range. This 250mV total tolerance ensures predictable brownout detection on +5V rails while accommodating manufacturing variation and temperature drift - critical for repeatable system-level power sequencing validation.
Does MAX708ESA provide both active-high and active-low reset outputs?
No, the MAX708ESA provides only an active-high RESET output (pin 6). Unlike the MAX707ESA, it does not include a complementary active-low RESET signal. The MAX708ESA replaces the watchdog output (WDO) found in MAX705/MAX706 with this dedicated active-high reset function - making it ideal for microcontrollers like the 80C51 that require high-asserted reset initiation.
Can MAX708ESA monitor voltages other than the main +5V supply?
Yes, the MAX708ESA's PFI pin accepts any external voltage referenced to GND and compares it against its internal 1.25V reference. By connecting a resistor divider from a +12V rail to PFI, for example, the device can generate a PFO alert when the 12V supply falls below ~11V - enabling multi-rail supervision without additional comparators or references.
What is the minimum VCC required for MAX708ESA to assert a valid RESET output?
The MAX708ESA guarantees valid RESET output down to VCC = 1.2V, with RESET remaining high and within logic-level specifications (≤0.3V low, ≥VCC–1.5V high) across the full industrial temperature range. This allows the device to hold the microprocessor in reset during deep brownout events well below typical 3.3V or 5V operating rails - enhancing system robustness.
How does the manual-reset input (MR) behave electrically on MAX708ESA?
The MR input on MAX708ESA is active-low with TTL/CMOS-compatible thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), internally pulled up with 250µA current. It accepts direct connection to pushbutton switches (to GND) or logic lines, and features built-in noise immunity with 150ns minimum pulse width requirement - eliminating need for external debounce circuitry in most implementations.
MAX708ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX708ESA FAQ
1.How can I place an order for MAX708ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708ESA 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 MAX708ESA reliable?
The price and inventory of MAX708ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708ESA is usually 5 days.
3.What payment methods are accepted for MAX708ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708ESA?
MAX708ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708ESA 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 MAX708ESA?
For technical support, including MAX708ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708ESA requirements.
6.How does Aetrix verify that MAX708ESA is sourced from the original manufacturer or authorized distributors?
All MAX708ESA 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 MAX708ESA meets industry standards.
7.What is the process for return or replacement of MAX708ESA?
All MAX708ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708ESA, 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 MAX708ESA part is unused and in its original packaging.
Return procedure for MAX708ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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