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Analog Devices Inc./Maxim Integrated MAX708CSA-TG068
- Part No.:
- MAX708CSA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX708CSA-TG068.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX708CSA-TG068 from Maxim Integrated is an 8-pin SO-package microprocessor supervisory IC providing active-high reset output, power-fail monitoring, manual-reset input, and watchdog timeout detection with 4.40V reset threshold and 1.6s watchdog period. It ensures reliable µP startup and brownout recovery in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX708CSA-TG068 datasheet, MAX708CSA-TG068 pinout, MAX708CSA-TG068 application, or MAX708CSA-TG068 equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1V, debounced MR input timing, PFI comparator accuracy (1.25V ±0.05V), and compatibility with +5V supply systems requiring stable reset assertion during voltage transients.
Technical Context
The MAX708CSA-TG068 integrates a precision voltage monitor with 4.40V reset threshold and 40mV hysteresis, a 1.25V reference-based power-fail comparator (PFI/PFO), and a 1.6s watchdog timer cleared by WDI edge transitions. Its active-high RESET output remains valid down to VCC = 1V, supporting low-voltage brownout detection.
Unlike the MAX705/MAX706 series, the MAX708 substitutes active-high RESET for watchdog output - WDO is omitted, and RESET replaces it. The device uses internal 250µA MR pull-up current and guarantees 200ms minimum reset pulse width after VCC rise or MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - triggers reset when +5V supply drops below this level, ensuring robust brownout protection |
| Reset Pulse Width | 200ms typical - holds µP in known state long enough for full initialization after power recovery |
| Watchdog Timeout | 1.6s ±0.65s - detects µP lockup if WDI is not toggled, but MAX708 does not provide WDO output |
| VCC Operating Range | 1.0V to 5.5V - enables valid RESET assertion even during deep brownout down to 1V supply |
| Supply Current | 50µA typical at VCC = 5V - ultra-low quiescent draw suitable for battery-backed systems |
| PFI Threshold | 1.25V ±0.05V - precise reference for external voltage monitoring (e.g., +12V rail via divider) |
| MR Input Threshold | 0.8V low / 2.0V high - TTL/CMOS-compatible manual reset interface with internal 250µA pull-up |
Pinout & Package
MAX708CSA-TG068 is supplied in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and gull-wing leads. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up with 250µA; debounced by 200ms reset pulse |
| 2 VCC | +5V Supply Input | Primary power rail; RESET remains valid down to 1.0V; max 5.5V absolute rating |
| 3 GND | Ground Reference | Common return for all analog and digital functions; required for accurate PFI threshold operation |
| 4 PFI | Power-Fail Input | Monitors external voltage via resistor divider; asserts PFO when input falls below 1.25V |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; used for early warning or interrupt |
| 6 N.C. | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines |
| 7 RESET | Active-High Reset Output | Complementary to RESET; drives high during normal operation; low only during reset assertion |
| 8 VCC | +5V Supply Input | Duplicate VCC pin for improved power integrity; must be connected to same +5V net as Pin 2 |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at Low VCC | RESET output remains functional down to VCC = 1.0V, enabling reliable reset assertion during severe brownout |
| Integrated Power-Fail Comparator | 1.25V precision reference allows accurate monitoring of secondary rails (e.g., +12V) using external resistive dividers |
| Debounced Manual-Reset Interface | 250µA internal MR pull-up and 200ms reset pulse eliminate need for external RC debounce circuitry |
| High-Accuracy Reset Threshold | 4.40V ±0.15V with 40mV hysteresis prevents chatter during slow VCC ramp-up or decay |
| Low Quiescent Current | 50µA typical supply current extends battery life in portable or backup-power applications |
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 hold CPU in safe state during undervoltage events on main +5V rail. Use Value: Prevents spurious I/O writes and firmware corruption by guaranteeing 200ms reset hold time after VCC recovers above 4.40V. |
Use Scenario: Ensuring deterministic boot sequence in portable ultrasound units powered by Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Monitoring both main +5V rail and backup battery voltage via PFI to initiate graceful shutdown before critical brownout. Use Value: Enables orderly data save and system suspend using PFO-triggered interrupt, leveraging 1.25V reference accuracy for ±1% battery voltage tracking. |
| Telecom Base Station Management | Automotive Infotainment ECUs |
Use Scenario: Cold-start reliability in remote radio head modules where 48V-to-5V conversion exhibits slow ramp-up under low-temperature conditions. IC Role / Device Role / Timing Role: Providing delayed active-high RESET to ARM Cortex-M4 core until +5V stabilizes above 4.40V for ≥200ms. Use Value: Eliminates boot failures caused by premature clock enable or memory initialization before supply regulation settles. |
Use Scenario: Reset coordination across multiple SoCs (application processor, audio DSP, CAN controller) sharing a common +5V domain. IC Role / Device Role / Timing Role: Single-point reset generation with MR input synchronized to ignition-on transition and PFI monitoring of auxiliary 12V rail. Use Value: Ensures atomic system-wide reset without race conditions, using debounced MR and 4.40V threshold matched to automotive load-dump immunity specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708ESA | Same functionality and pinout; -40°C to +85°C extended temperature range vs. 0°C to +70°C for MAX708CSA-TG068 | Suitable for outdoor telecom or industrial environments with wider ambient swings | Select MAX708ESA when operating beyond commercial temperature limits; otherwise MAX708CSA-TG068 suffices |
| MAX707CSA | Identical package and pinout; differs only in reset threshold (4.65V vs. 4.40V); shares same active-high RESET and no WDO | Better suited for systems with tighter +5V tolerance where earlier reset assertion is required | Choose MAX707CSA if design requires reset at 4.65V; MAX708CSA-TG068 is optimal for 4.40V brownout margin |
Compared with MAX708ESA and MAX707CSA, MAX708CSA-TG068 offers the narrowest temperature grade but lowest cost for commercial-grade +5V µP supervision, with identical SO-8 footprint and guaranteed 1V RESET validity - making it ideal for cost-sensitive, indoor-deployed embedded controllers.
Availability
MAX708CSA-TG068 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management, and automotive infotainment ECUs requiring stable component supply with consistent lead-time and traceable sourcing.
Supply support for MAX708CSA-TG068 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, sensing, and connectivity applications, with emphasis on high-reliability embedded systems.
The MAX705–MAX708/MAX813L product line delivers integrated µP supervisory functions - reset, watchdog, power-fail detection, and manual reset - targeting space-constrained, cost-sensitive embedded control applications.
FAQ
What is the reset threshold voltage for MAX708CSA-TG068?
The MAX708CSA-TG068 has a nominal reset threshold of 4.40V with a guaranteed range of 4.25V to 4.50V over temperature. This threshold determines the supply voltage level below which the active-high RESET output is driven low to hold the microprocessor in reset, ensuring reliable operation during brownout conditions on the +5V rail.
Does MAX708CSA-TG068 include a watchdog timer output?
No, the MAX708CSA-TG068 does not provide a watchdog output (WDO). It retains the watchdog timer function internally but omits the WDO pin - unlike the MAX705/MAX706 - and instead provides only active-high RESET and active-low RESET outputs. Watchdog timeout detection is present but cannot drive an external signal without external circuitry.
Can MAX708CSA-TG068 monitor voltages other than +5V?
Yes, MAX708CSA-TG068 can monitor voltages other than +5V using its PFI input. By connecting a resistor divider to PFI, users can scale higher voltages (e.g., +12V or +24V) to fall within the 1.25V comparator window. The device's 1.25V ±0.05V reference enables accurate external rail monitoring for power-fail warning or battery-level detection.
What is the minimum supply voltage at which MAX708CSA-TG068 guarantees RESET functionality?
The MAX708CSA-TG068 guarantees valid RESET output operation down to VCC = 1.0V. At this level, the active-high RESET output remains functional and can drive a load, enabling robust reset assertion even during deep brownout conditions - a key differentiator from many competing supervisors that fail below 2.0V.
Is MAX708CSA-TG068 pin-compatible with MAX707CSA?
Yes, MAX708CSA-TG068 is pin-compatible with MAX707CSA. Both are 8-pin SO devices with identical pin assignments: MR, VCC, GND, PFI, PFO, N.C., RESET, and VCC. The only functional difference is reset threshold (4.40V for MAX708CSA-TG068 vs. 4.65V for MAX707CSA); no PCB changes are required for substitution in compatible designs.
MAX708CSA-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX708CSA-TG068 FAQ
1.How can I place an order for MAX708CSA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708CSA-TG068 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 MAX708CSA-TG068 reliable?
The price and inventory of MAX708CSA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708CSA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX708CSA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708CSA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708CSA-TG068?
MAX708CSA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708CSA-TG068 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 MAX708CSA-TG068?
For technical support, including MAX708CSA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708CSA-TG068 requirements.
6.How does Aetrix verify that MAX708CSA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX708CSA-TG068 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 MAX708CSA-TG068 meets industry standards.
7.What is the process for return or replacement of MAX708CSA-TG068?
All MAX708CSA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX708CSA-TG068, 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 MAX708CSA-TG068 part is unused and in its original packaging.
Return procedure for MAX708CSA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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