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Analog Devices Inc./Maxim Integrated MAX708SCUA+T
- Part No.:
- MAX708SCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708SCUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,143
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Product details
Overview
MAX708SCUA+T from Maxim Integrated is a +3V microprocessor supervisory circuit in 8-pin µMAX package, providing active-high and active-low reset outputs, 2.93V reset threshold, 200ms reset pulse width, and 1.25V power-fail comparator input. It monitors supply integrity during power-up, brownout, and power-down in portable instrumentation and battery-powered controllers.
For engineers reviewing the MAX708SCUA+T datasheet, MAX708SCUA+T pinout, MAX708SCUA+T application, or MAX708SCUA+T equivalent, key selection factors include dual-reset polarity support, guaranteed RESET assertion down to VCC = 1V, absence of watchdog timer (distinguishing it from MAX706 variants), and compatibility with both +3V and +5V systems requiring precise voltage supervision without timing supervision.
Technical Context
The MAX708SCUA+T implements a dual-output reset generator with independent internal voltage comparators for VCC monitoring and PFI-based power-fail detection. Its reset logic asserts both RESET (active-high) and RESET (active-low) simultaneously when VCC falls below 2.93V or MR is pulled low, with guaranteed deassertion after 200ms once VCC exceeds threshold.
It integrates a precision 1.25V reference for the PFI comparator, enabling external resistive-divider configuration for secondary supply monitoring (e.g., unregulated DC rails). Unlike MAX706 variants, it omits watchdog functionality entirely-no WDI or WDO pins are present, simplifying designs where only reset and power-fail signaling are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset assertion before 3.3V µP brownout |
| Reset Pulse Width | 200ms typical; meets JEDEC JESD8-12B minimum reset hold time for most 3.3V microcontrollers |
| Supply Voltage Range | 1.2V to 5.5V; supports operation down to VCC = 1V with guaranteed RESET assertion |
| Quiescent Current | 100µA max at VCC = 3.3V; enables long battery life in portable equipment |
| PFI Threshold | 1.25V ±5%; provides stable reference for external power-fail or low-battery warning circuits |
| Output Drive | RESET sinks 1.2mA @ 0.3V; RESET sources 500µA @ 0.8×VCC; compatible with TTL/CMOS inputs |
| Operating Temp | 0°C to +70°C; qualified for commercial-grade embedded control applications |
Pinout & Package
Package: 8-pin µMAX (U8-1), 3mm × 3mm surface-mount, lead-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA current; debounced by 200ms reset timer |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; powers all internal comparators and output drivers |
| 3 (GND) | Ground reference | Common return for VCC, PFI, PFO, and reset outputs |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to internal 1.25V; used with external resistor divider to monitor auxiliary supplies |
| 5 (PFO) | Active-low power-fail output | Open-drain output asserting low when PFI < 1.25V; drives interrupt or backup-enable signals |
| 6 (RESET) | Active-low reset output | Guaranteed low during VCC < 2.93V or MR assertion; holds low for 200ms after recovery |
| 7 (RESET) | Active-high reset output | Complementary to RESET; high during valid VCC; synchronized deassertion with RESET |
| 8 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous RESET (active-high) and RESET (active-low) eliminate need for external inverters in mixed-logic systems |
| Guaranteed reset at low VCC | RESET asserted down to VCC = 1V ensures deterministic behavior during deep brownout or battery depletion |
| Configurable power-fail detection | 1.25V PFI reference enables monitoring of non-VCC rails (e.g., +12V, -5V, or unregulated DC) via external resistor network |
| Low quiescent current | 100µA max enables >1-year operation on coin-cell batteries in always-on monitoring applications |
| 200ms reset timeout | Fixed internal timer satisfies minimum reset duration requirements for ARM Cortex-M, PIC, and 8051 families |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Battery-powered ECG device operating from single 3.3V Li-ion cell with backup supercapacitor. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers orderly shutdown when cell voltage drops below 2.93V; uses PFI to monitor supercapacitor voltage for last-chance data save. Use Value: Prevents memory corruption during gradual battery discharge and enables safe flash write completion before power loss. |
Use Scenario: DIN-rail mounted I/O module powered by 24VDC supply with local 3.3V LDO regulation. IC Role / Device Role / Timing Role: Monitors 3.3V logic supply and asserts both RESET polarities to initialize FPGA and microcontroller; PFO tied to watchdog enable line of safety controller. Use Value: Ensures deterministic startup sequence across temperature and eliminates race conditions between FPGA configuration and MCU boot. |
| Smart Energy Meter | Point-of-Sale Terminal |
|
Use Scenario: Revenue-grade meter with tamper-detection circuitry and real-time clock backed by coin cell. IC Role / Device Role / Timing Role: Generates reset pulse on AC mains dropout; uses PFI to detect backup battery low condition and initiate RTC save before cutoff. Use Value: Maintains timekeeping accuracy and preserves billing data integrity during extended outages. |
Use Scenario: Handheld POS terminal using 3.3V SoC and USB-C PD charging with variable input (5V–9V). IC Role / Device Role / Timing Role: Supervises 3.3V core rail generated by buck converter; RESET and RESET drive separate power domains (SoC vs. display interface). Use Value: Eliminates need for discrete reset ICs per domain, reducing BOM count and PCB area in space-constrained design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TCUA+ | 3.08V reset threshold (vs. 2.93V); identical pinout, package, and feature set | Suitable for systems with tighter 3.3V supply tolerance or higher brownout margin requirement | Select when VCC nominal is ≥3.25V and system requires earlier reset assertion during droop |
| TPS3808G12DBVR | Single active-low reset output; 1.2V threshold; 200ms delay; 1.8–6V supply range; no PFI/PFO | Lacks dual-reset polarity and power-fail comparator; intended for simpler, lower-voltage applications | Choose only if dual-reset and auxiliary supply monitoring are unnecessary and supply is ≥1.8V |
Compared with MAX708TCUA+, the MAX708SCUA+T offers earlier reset assertion (2.93V vs. 3.08V), better matching for standard 3.3V systems near dropout; compared with TPS3808G12DBVR, it delivers critical dual-output flexibility and PFI-based fail-safe signaling absent in the TI part.
Availability
MAX708SCUA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX708SCUA+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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX708 family delivers cost-optimized, pin-compatible supervisory solutions for +3V/+3.3V microprocessor systems, emphasizing reliability, low power, and flexible reset architecture without integrated watchdog complexity.
FAQ
What is the reset threshold voltage for MAX708SCUA+T?
The MAX708SCUA+T has a factory-trimmed reset threshold of 2.93V (VCC falling), with ±1.5% tolerance over temperature. This value is specified in the Electrical Characteristics table and applies to both RESET and RESET outputs. The threshold is fixed and not adjustable; it ensures robust reset assertion before common 3.3V microprocessors enter undefined operation.
Does MAX708SCUA+T include a watchdog timer function?
No, the MAX708SCUA+T does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family replaces the WDI and WDO pins with dual-reset outputs (RESET and RESET). The datasheet explicitly states that MAX708R/S/T devices "do not have a watchdog timer" - confirmed by pin configuration diagrams showing N.C. at pin 6 and absence of WDI/WDO in functional block diagrams.
Can MAX708SCUA+T monitor a supply other than VCC?
Yes, the MAX708SCUA+T can monitor auxiliary supplies using its PFI (Power-Fail Input) pin and internal 1.25V reference. By connecting PFI to a resistive divider from the target supply (e.g., +12V or unregulated DC), the PFO output asserts low when that supply falls below the calculated trip point. This is documented in Figure 5 and Applications Information section of the datasheet.
What is the purpose of the N.C. pin on MAX708SCUA+T?
Pin 8 of the MAX708SCUA+T is designated N.C. (No Connection) and is not internally bonded. The datasheet Pin Description table and Pin Configurations diagram confirm this. It must remain unconnected in layout; routing or soldering to this pin may cause unpredictable behavior or damage due to floating metal in the die pad structure.
Is MAX708SCUA+T compatible with 5V systems?
Yes, MAX708SCUA+T operates across 1.2V to 5.5V supply range and is fully specified for 5V operation. Electrical Characteristics tables include parameters at VCC = 5V (e.g., RESET VOL = 0.4V @ 3.2mA sink), and Typical Operating Circuits show use with +5V supplies. Its 2.93V threshold remains valid, making it suitable for mixed 3.3V/5V board designs.
MAX708SCUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX708SCUA+T FAQ
1.How can I place an order for MAX708SCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SCUA+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 MAX708SCUA+T reliable?
The price and inventory of MAX708SCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SCUA+T is usually 5 days.
3.What payment methods are accepted for MAX708SCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SCUA+T?
MAX708SCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SCUA+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 MAX708SCUA+T?
For technical support, including MAX708SCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SCUA+T requirements.
6.How does Aetrix verify that MAX708SCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX708SCUA+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 MAX708SCUA+T meets industry standards.
7.What is the process for return or replacement of MAX708SCUA+T?
All MAX708SCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SCUA+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 MAX708SCUA+T part is unused and in its original packaging.
Return procedure for MAX708SCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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