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Analog Devices Inc./Maxim Integrated MAX708CUA
- Part No.:
- MAX708CUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708CUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:19,125
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Product details
Overview
MAX708CUA from Maxim Integrated is an 8-pin μMAX-packaged microprocessor supervisory circuit providing active-high reset output, power-fail monitoring, manual-reset input, and watchdog timer disable (replaced by active-high RESET). It asserts RESET when VCC drops below 4.40V, guarantees valid reset down to VCC = 1V, delivers a 200ms reset pulse width, and supports +5V systems in industrial controllers and embedded instrumentation.
For engineers reviewing the MAX708CUA datasheet, MAX708CUA pinout, MAX708CUA application, or MAX708CUA equivalent, this page delivers verified electrical parameters, confirmed μMAX-8 package mapping, validated terminal functions, and real-world timing behavior for power-up/brownout recovery, watchdog timeout handling, and PFI-based low-battery detection.
Technical Context
The MAX708CUA implements a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis, ensuring reliable brownout detection across temperature. Its internal 1.25V reference enables accurate power-fail warning via external resistor divider on PFI, with sub-microsecond response time (≤400ns) and <25nA input bias current.
Unlike the MAX705/MAX706 series, the MAX708CUA substitutes the watchdog output (WDO) with an active-high RESET output - making it functionally identical to the MAX707 but in μMAX-8 packaging. Manual-reset assertion (MR) triggers a debounced 200ms reset pulse, and RESET remains valid at VCC as low as 1V with guaranteed 0.4V sink voltage at 1.2mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset during brownout in +5V systems; matches MAX706/MAX708 family spec |
| Reset Pulse Width | 200ms (min 140ms) - ensures full µP initialization before release; immune to mid-pulse brownout recovery |
| Supply Voltage Range | 1.0V to 5.5V - guarantees functional RESET output even during deep brownout down to 1V VCC |
| Power-Fail Input Threshold | 1.25V ±50mV - enables precise low-battery or secondary supply monitoring via external divider |
| Quiescent Supply Current | 50µA (typ), 350µA (max) - ultra-low power for battery-backed systems; lower than MAX705/706 variants |
| Manual-Reset Input Threshold | 0.8V (low), 2.0V (high) - TTL/CMOS-compatible; internally pulled up with 250µA current |
| RESET Output Drive | Sinks 1.2mA @ 0.4V max - directly interfaces with standard µP reset inputs without external pull-down |
Pinout & Package
The MAX708CUA is housed in an 8-pin μMAX package (outline 21-0036), measuring 3.0mm × 3.0mm × 0.8mm, RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is marked by dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WDO/RESET) | Active-high reset output | Replaces WDO of MAX705/706; drives high when VCC ≥ 4.40V and no MR assertion; complements RESET |
| 2 (GND) | Ground reference | Common return for all analog/digital functions; must be low-impedance connection to system ground plane |
| 3 (VCC) | +5V supply input | Primary power source; monitors own voltage for reset generation; operates down to 1.0V |
| 4 (MR) | Manual-reset input | Active-low TTL/CMOS-compatible trigger; internally pulled up; 150ns minimum pulse width accepted |
| 5 (PFI) | Power-fail input | Monitors external voltage via resistor divider; comparator trips at 1.25V; <25nA input current minimizes loading |
| 6 (PFO) | Power-fail output | Open-drain active-low output; sinks current when PFI < 1.25V; used for µP interrupt or backup switchover |
| 7 (RESET) | Active-low reset output | Standard µP reset signal; asserted low during power-up/brownout/manual reset; 200ms min pulse width |
| 8 (N.C.) | No connect | Internally unconnected; must remain floating; no routing or soldering required |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables robust brownout recovery in systems with slow-ramping or weak supplies; avoids undefined µP state |
| 200ms reset pulse width with hysteresis | Ensures complete µP initialization and peripheral stabilization; prevents spurious release during marginal VCC |
| 1.25V precision power-fail comparator | Supports accurate early-warning detection for +12V, +3.3V, or negative rails using external dividers |
| Debounced TTL/CMOS-compatible MR input | Eliminates need for external RC debounce; accepts pushbutton or logic-level assertion without glitches |
| μMAX-8 package (3mm × 3mm) | Reduces PCB area by >70% vs. SO-8; compatible with automated SMT assembly; exposed pad improves thermal performance |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers with dual 24V/5V rails. IC Role / Device Role / Timing Role: Supervises main 5V rail, monitors 24V auxiliary via PFI divider, asserts RESET on brownout, and provides NMI-capable PFO interrupt for graceful shutdown. Use Value: Prevents firmware corruption during factory line voltage sags; enables deterministic restart after transient faults without operator intervention. |
Use Scenario: Battery-backed data acquisition module in portable ultrasound units requiring fail-safe power management. IC Role / Device Role / Timing Role: Monitors Li-ion battery voltage via PFI, triggers PFO interrupt to initiate flash save, and holds µP in RESET until safe shutdown completes. Use Value: Guarantees lossless capture of last diagnostic frame before battery depletion; meets IEC 62304 Class C software safety requirements. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Cold-cranking resilience in 12V automotive subsystems where battery voltage dips below 6V during engine start. IC Role / Device Role / Timing Role: Detects VCC drop below 4.40V during cranking, asserts RESET to halt non-critical CAN traffic, and releases only after stable 5V LDO output. Use Value: Avoids CAN bus arbitration errors and EEPROM write corruption during engine start-stop cycles. |
Use Scenario: Tamper-resistant metering IC with backup supercapacitor and real-time clock, operating from AC mains and auxiliary battery. IC Role / Device Role / Timing Role: Uses PFI to monitor supercap voltage; asserts PFO to trigger RTC backup switchover and RESET to freeze metering registers during AC dropout. Use Value: Maintains billing accuracy and timekeeping integrity during 200ms–2s grid interruptions per ANSI C12.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708CSA | Same functionality and specs, but in SO-8 package (4.9mm × 6.0mm); higher thermal resistance (5.88mW/°C derating) | Better suited for prototyping or legacy board designs with SO footprint; less space-constrained layouts | Select MAX708CSA if SO-8 compatibility or hand-soldering is required; otherwise MAX708CUA offers superior density and thermal performance. |
| MAX707CUA | Identical μMAX-8 package and pinout, but 4.65V reset threshold (not 4.40V); same RESET/RESET outputs and PFI/PFO functions | Used where tighter 5V rail tolerance is needed (e.g., systems with low-dropout regulators sensitive to 4.4V dropout) | Choose MAX707CUA for +5V systems requiring earlier reset assertion; MAX708CUA is optimal for wider 5V tolerance or legacy MAX706 design replacement. |
Compared with MAX708CSA and MAX707CUA, the MAX708CUA uniquely balances compact μMAX-8 footprint, 4.40V brownout sensitivity, and guaranteed 1V operation - making it the preferred choice for space-constrained industrial and portable designs requiring robust low-voltage reset behavior.
Availability
MAX708CUA 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 MAX708CUA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX705–MAX708/MAX813L product line was designed specifically for cost-sensitive microprocessor supervision in embedded systems - integrating reset generation, watchdog disable, power-fail warning, and manual reset into a single 8-pin IC with guaranteed low-VCC operation.
FAQ
What is the reset threshold voltage for MAX708CUA?
The MAX708CUA has a nominal reset threshold of 4.40V with ±150mV tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold (VRT)" for MAX706/MAX708 devices. It ensures reliable reset assertion during brownout conditions in standard +5V systems, and differs from the 4.65V threshold of MAX705/MAX707 variants.
Does MAX708CUA include a watchdog timer?
No, the MAX708CUA does not include an active watchdog timer. Per the General Description and Pin Description sections, the MAX707/MAX708 replace the watchdog output (WDO) of the MAX705/MAX706 with an active-high RESET output. The MAX708CUA implements only reset supervision, power-fail monitoring, and manual reset - making it functionally equivalent to MAX707 with 4.40V threshold.
What is the minimum supply voltage at which MAX708CUA guarantees valid RESET output?
The MAX708CUA guarantees valid RESET output down to VCC = 1.0V, as explicitly stated in the Electrical Characteristics table under "Operating Voltage Range" and confirmed in the Detailed Description section. At VCC = 1.0V, RESET remains a logic-low output with ≤0.3V sink voltage at 50µA load, enabling reliable operation during deep brownout recovery.
Can MAX708CUA monitor voltages other than +5V?
Yes, the MAX708CUA can monitor any DC voltage using its PFI input and internal 1.25V comparator. By connecting a resistor divider between the target voltage and GND, the voltage at PFI is scaled to trip at 1.25V - enabling monitoring of +12V, +3.3V, or even negative rails. The Applications Information section provides example circuits for +12V and negative supply monitoring.
What package type is used for MAX708CUA?
The MAX708CUA uses the 8-pin μMAX package (package code U8+1, outline 21-0036), measuring 3.0mm × 3.0mm × 0.8mm with an exposed thermal pad. This RoHS-compliant surface-mount package is documented in the Package Information section and distinguishes MAX708CUA from DIP and SO variants of the same family.
MAX708CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX708CUA FAQ
1.How can I place an order for MAX708CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708CUA 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 MAX708CUA reliable?
The price and inventory of MAX708CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708CUA is usually 5 days.
3.What payment methods are accepted for MAX708CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708CUA?
MAX708CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708CUA 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 MAX708CUA?
For technical support, including MAX708CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708CUA requirements.
6.How does Aetrix verify that MAX708CUA is sourced from the original manufacturer or authorized distributors?
All MAX708CUA 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 MAX708CUA meets industry standards.
7.What is the process for return or replacement of MAX708CUA?
All MAX708CUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708CUA, 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 MAX708CUA part is unused and in its original packaging.
Return procedure for MAX708CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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