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Analog Devices Inc./Maxim Integrated MAX708TCUA+
- Part No.:
- MAX708TCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708TCUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
MAX708TCUA+ from Maxim Integrated is a +3V microprocessor supervisory circuit with active-high and active-low reset outputs, 3.08V reset threshold, 200ms reset pulse width, 100µA quiescent current, and 1.25V power-fail comparator input - used for reliable power-up/power-down monitoring in battery-powered portable instruments and embedded controllers.
For engineers reviewing the MAX708TCUA+ datasheet, MAX708TCUA+ pinout, MAX708TCUA+ application, or MAX708TCUA+ equivalent, this device delivers dual-reset signaling, brownout immunity down to VCC = 1V, precision voltage supervision for +3.3V systems, and integrated manual reset debouncing - critical for industrial and portable electronics requiring deterministic reset behavior under supply transients.
Technical Context
The MAX708TCUA+ integrates a dual-output reset generator with independent active-high (RESET) and active-low (RESET) signals, both asserted when VCC falls below 3.08V or MR is pulled low. Its internal timer guarantees 200ms deassertion delay after VCC exceeds threshold or MR release.
It includes a 1.25V precision reference for the PFI/PFO power-fail comparator, enabling early-warning detection of unregulated supply droop, and features guaranteed RESET assertion down to VCC = 1V - unlike watchdog-equipped MAX706 variants, MAX708 devices omit the WDI/WDO function entirely.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reset assertion before +3.3V µP brownout |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Supply Current | 100µA max at VCC < 3.6V; enables long battery life in portable equipment |
| Power-Fail Threshold | 1.25V internal reference; supports adjustable PFI trip point via external resistor divider |
| Operating Voltage Range | 1.2V to 5.5V; guarantees functional reset assertion even during deep undervoltage (down to 1V) |
| Manual Reset Input | TTL/CMOS-compatible; 500ns minimum pulse width at +3V; internally pulled up with 70µA source |
| Output Drive Strength | RESET sinks 1.2mA @ 0.3V; RESET sources 500µA @ 0.8×VCC - compatible with standard µP reset inputs |
Pinout & Package
MAX708TCUA+ is housed in an 8-pin µMAX® package (U8-1), 3mm × 3mm, exposed pad, thin-profile surface-mount封装 optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Pull low to trigger 200ms reset pulse; TTL/CMOS-compatible; internally pulled up with 70µA |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; reset guaranteed active down to VCC = 1V |
| 3 (GND) | Ground reference | Common return for all internal circuits and output sinks |
| 4 (PFI) | Power-fail comparator input | Connect to resistive divider; asserts PFO when voltage falls below 1.25V |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used for early-warning interrupt or cascaded reset |
| 6 (RESET) | Active-high reset output | Asserted high during power-up/brownout; deasserts 200ms after VCC > 3.08V or MR release |
| 7 (RESET) | Active-low reset output | Asserted low during same conditions as RESET; complementary signal for mixed-logic systems |
| 8 (NC) | No connection | Not internally bonded; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-high and active-low reset outputs | Eliminates need for external inverters in systems requiring both logic polarities |
| Guaranteed reset assertion to VCC = 1V | Ensures µP remains held in reset during severe brownout or battery depletion |
| 1.25V precision power-fail comparator reference | Enables accurate, temperature-stable early-warning detection of unregulated supply collapse |
| 200ms factory-trimmed reset timeout | Meets JEDEC JESD22-B102 reliability requirements for µP initialization timing |
| Debounced manual reset input | 140ms minimum effective pulse width prevents false triggers from mechanical switch bounce |
Applications
| Battery-Powered Portable Instruments | Industrial Controller Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with +3.3V LDO regulation. IC Role / Device Role / Timing Role: Supervises main +3.3V rail and triggers reset if battery drops below 3.0V or LDO fails; PFO monitors raw battery for graceful shutdown. Use Value: Prevents corrupted EEPROM writes and firmware lockup during battery sag using dual-reset signaling and 1V fail-safe assertion. |
Use Scenario: PLC I/O module operating from +24V DC converted to +3.3V and +5V rails. IC Role / Device Role / Timing Role: Monitors +3.3V µP supply and generates synchronized RESET/RESET pulses; PFI senses unregulated +24V via divider for predictive fault reporting. Use Value: Enables deterministic system recovery after transient overvoltage or undervoltage events without watchdog dependency. |
| Embedded Medical Diagnostic Device | Automated Test Equipment (ATE) |
Use Scenario: Portable ECG analyzer with flash memory, ADC, and Bluetooth radio. IC Role / Device Role / Timing Role: Ensures µC resets cleanly on power-up and during battery swap; PFO interrupts µC to save session data before power loss. Use Value: Meets IEC 62304 Class B software safety requirements via hardware-enforced reset timing and fail-safe voltage thresholds. |
Use Scenario: Rack-mounted ATE controller with hot-swap power modules and FPGA configuration memory. IC Role / Device Role / Timing Role: Provides simultaneous active-high and active-low reset to FPGA and companion ASIC; monitors auxiliary +3.3V supply for configuration integrity. Use Value: Guarantees bitstream reload and state machine reset on any supply anomaly, eliminating metastability in high-speed digital test paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TCUA+ | Single active-low RESET output; identical 3.08V threshold and 200ms timeout; includes WDI/WDO watchdog | Lacks dual-reset capability; adds watchdog functionality unsuitable where WDI routing is impractical | Select only if watchdog timer is required and dual-reset polarity is unnecessary |
| TPS3808G30DBVR | 3.0V reset threshold (±0.5%); 200ms fixed delay; 2.9µA quiescent current; no PFI/PFO comparator | Ultra-low power but omits power-fail warning function; requires external circuitry for early-warning detection | Prefer for battery-critical applications where PFI functionality is unused and sub-5µA supply current is mandatory |
Compared with MAX706TCUA+ and TPS3808G30DBVR, MAX708TCUA+ uniquely combines dual-polarity reset outputs and integrated 1.25V power-fail detection in a single 8-pin µMAX package - making it optimal for space-constrained, safety-aware systems needing both robust reset coordination and predictive supply failure response.
Availability
MAX708TCUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controllers, medical diagnostics, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for MAX708TCUA+ 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 power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX708 family was engineered specifically for cost-sensitive, space-constrained +3V/+3.3V microprocessor systems requiring deterministic reset behavior, brownout immunity, and early power-fail warning - without watchdog complexity.
FAQ
What is the reset threshold voltage for MAX708TCUA+?
The MAX708TCUA+ has a factory-trimmed reset threshold of 3.08V (VCC falling), with ±75mV tolerance. This value is specified for operation across the full temperature range and ensures reliable reset assertion before most +3.3V microprocessors enter undefined states during brownout conditions. The threshold hysteresis is 20mV, preventing chatter near the trip point.
Does MAX708TCUA+ include a watchdog timer function?
No, MAX708TCUA+ does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family replaces the WDI/WDO pins with dual reset outputs (RESET and RESET). This makes MAX708TCUA+ ideal for applications where deterministic reset timing is required without software-managed watchdog supervision.
How does the power-fail comparator work in MAX708TCUA+?
The MAX708TCUA+ power-fail comparator uses an internal 1.25V reference connected to the inverting input. The non-inverting input is the PFI pin. When the voltage at PFI falls below 1.25V, the PFO output goes low. This allows users to monitor secondary supplies (e.g., unregulated DC or negative rails) via external resistor dividers - enabling early-warning shutdown before main supply collapse.
What is the purpose of the NC pin on MAX708TCUA+?
Pin 8 of MAX708TCUA+ is designated NC (No Connection) and is not internally bonded. It must be left floating or connected to GND per PCB layout best practices to minimize noise coupling. Unlike functional pins, NC carries no electrical role and should never be used for thermal relief or signal routing.
Can MAX708TCUA+ operate reliably at VCC = 1.2V?
Yes, MAX708TCUA+ is fully specified down to VCC = 1.2V (industrial temperature range) and guarantees RESET assertion down to VCC = 1V. At 1.2V, the device maintains valid logic levels on RESET and RESET outputs, and the 1.25V PFI comparator remains functional - enabling use in ultra-low-voltage backup domains or deep-brownout recovery circuits.
MAX708TCUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX708TCUA+ FAQ
1.How can I place an order for MAX708TCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708TCUA+ 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 MAX708TCUA+ reliable?
The price and inventory of MAX708TCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708TCUA+ is usually 5 days.
3.What payment methods are accepted for MAX708TCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708TCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708TCUA+?
MAX708TCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708TCUA+ 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 MAX708TCUA+?
For technical support, including MAX708TCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708TCUA+ requirements.
6.How does Aetrix verify that MAX708TCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX708TCUA+ 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 MAX708TCUA+ meets industry standards.
7.What is the process for return or replacement of MAX708TCUA+?
All MAX708TCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708TCUA+, 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 MAX708TCUA+ part is unused and in its original packaging.
Return procedure for MAX708TCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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