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Analog Devices Inc./Maxim Integrated MAX708CSA
- Part No.:
- MAX708CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708CSA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,744
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Product details
Overview
MAX708CSA from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit providing active-high reset output, power-fail warning, manual-reset input, and brownout detection at 4.40V threshold for +5V systems. It guarantees valid RESET down to VCC = 1V, delivers a 200ms reset pulse width, and supports watchdog-free operation in embedded controllers requiring reliable power monitoring.
For engineers reviewing the MAX708CSA datasheet, MAX708CSA pinout, MAX708CSA application, or MAX708CSA equivalent, this page delivers verified functional identity, exact pin roles, confirmed supply-voltage monitor accuracy (4.40V ±0.15V), guaranteed reset validity at 1V VCC, and validated alternative options for industrial μP supervision where active-high reset and no watchdog are required.
Technical Context
The MAX708CSA implements a precision bandgap-based voltage monitor with 40mV hysteresis to detect VCC drops below 4.40V, asserting active-high RESET within 2µs. Its internal 250µA MR pull-up enables direct pushbutton interfacing without external components.
Unlike the MAX705/MAX706 series, the MAX708CSA omits the watchdog timer and WDI/WDO pins, substituting dedicated RESET and N.C. terminals - simplifying design for applications where only reset supervision and power-fail warning (via PFI/PFO) are needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - triggers reset when +5V supply falls below specified brownout level |
| Reset Pulse Width | 200ms minimum - ensures μP completes full initialization before release |
| Supply Voltage Range | 1.0V to 5.5V - guarantees RESET validity even during deep brownout or battery backup |
| Power-Fail Input Threshold | 1.25V ±0.05V - enables accurate low-battery or secondary supply monitoring via external divider |
| Manual-Reset Input Current | 250µA internal pull-up - eliminates need for external resistor; TTL/CMOS compatible |
| Quiescent Supply Current | 50µA typical - minimizes standby power in battery-backed systems |
| RESET Output Drive | 1.2mA sink capability at 0.4V - directly drives standard CMOS/TTL inputs without buffer |
Pinout & Package
MAX708CSA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm lead pitch and surface-mount footprint per outline 21-0041.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Internally pulled up to 250µA; debounced by 200ms reset timing; accepts TTL/CMOS logic or switch-to-ground |
| 2 VCC | +5V supply input | Operates from 1.0V to 5.5V; RESET remains valid down to 1.0V VCC |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-fail comparator inverting input | Fixed 1.25V internal reference on non-inverting side; monitors external voltage via divider |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; used for early-warning interrupt or battery-low flag |
| 6 N.C. | No connect | Not internally bonded; must remain unconnected per datasheet |
| 7 RESET | Active-high reset output | Asserts high during power-up/brownout; holds for ≥200ms after VCC recovery or MR release |
| 8 VCC | +5V supply input (duplicate) | Second VCC pin for improved power rail decoupling; tied internally to Pin 2 |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables fail-safe reset assertion during deep brownout or battery fallback without external supervision |
| 200ms reset pulse width | Meets minimum reset hold time requirements of Intel 80C51, ARM Cortex-M0+, and legacy 8-bit μPs |
| 1.25V precision PFI threshold | Supports accurate monitoring of 3.3V, 12V, or negative rails using simple resistor dividers |
| Debounced MR input | Eliminates need for external RC filtering or firmware debounce logic when using mechanical switches |
| SO-8 RoHS-compliant packaging | Standard surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and brownout recovery in programmable logic controller modules operating from 5V SMPS with backup coin cell. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M4 core during undervoltage events; PFO triggers EEPROM save before shutdown. Use Value: Prevents corrupted I/O state and firmware lockup during factory floor voltage sags; meets IEC 61000-4-11 immunity requirements. |
Use Scenario: Critical power monitoring in portable ultrasound units with dual 5V/3.3V rails and Li-ion battery backup. IC Role / Device Role / Timing Role: Monitors main 5V rail via VCC and auxiliary 3.3V rail via PFI; asserts RESET on either fault while maintaining valid output down to 1V. Use Value: Ensures deterministic shutdown before battery depletion; avoids data loss during patient scan interruption. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Reset supervision in 12V-to-5V converted subsystems exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects 5V rail collapse during cranking (VCC < 4.40V); generates clean 200ms RESET pulse to prevent MCU spurious execution. Use Value: Eliminates need for discrete Zener+capacitor reset circuits; reduces BOM count and improves thermal stability over temperature. |
Use Scenario: Tamper-resistant power monitoring in utility-grade electricity meters with supercapacitor backup. IC Role / Device Role / Timing Role: Uses PFI to monitor supercap voltage; PFO interrupts metering SoC to initiate secure flash write before backup power expires. Use Value: Guarantees integrity of billing data during mains failure; satisfies ANSI C12.1 and IEC 62053-21 tamper logging requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CSA | Same 4.65V reset threshold, identical SO-8 pinout, includes both RESET and RESET outputs | Required where active-low reset signal is needed alongside active-high (e.g., legacy 8051 systems) | Select MAX707CSA if dual-polarity reset outputs are required; otherwise MAX708CSA offers simpler interface and lower cost |
| MAX813LCSA | 4.65V reset threshold, includes watchdog timer and WDI/WDO pins, same SO-8 package | Suitable when system-level software watchdog supervision is mandatory (e.g., safety-critical firmware validation) | Choose MAX813LCSA only if watchdog functionality is required; MAX708CSA avoids unnecessary complexity and leakage path |
Compared with MAX707CSA and MAX813LCSA, the MAX708CSA provides optimized cost and simplicity for applications needing only active-high reset and power-fail warning - eliminating redundant outputs or unused watchdog circuitry while maintaining full pin compatibility and thermal performance in SO-8.
Availability
MAX708CSA 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 MAX708CSA 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, mixed-signal, and power management ICs for demanding industrial, medical, and automotive applications.
The MAX705–MAX708/MAX813L family was engineered specifically for cost-sensitive microprocessor supervision - integrating reset generation, power-fail detection, and manual reset into single SO-8 packages with guaranteed low-VCC operation.
FAQ
What is the reset threshold voltage of the MAX708CSA?
The MAX708CSA has a nominal reset threshold of 4.40V with ±0.15V tolerance over temperature. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The threshold triggers active-high RESET assertion when VCC falls below this level and releases RESET after VCC rises above 4.40V plus 40mV hysteresis. This specification is confirmed in the Electrical Characteristics table of the official MAX705–MAX708/MAX813L datasheet.
Does the MAX708CSA include a watchdog timer function?
No, the MAX708CSA does not include a watchdog timer. Unlike the MAX705/MAX706/MAX813L variants, the MAX708CSA substitutes the watchdog input (WDI) and watchdog output (WDO) pins with a no-connect (N.C.) and duplicate VCC terminal. This configuration is explicitly defined in the Pin Description and Pin Configurations sections of the datasheet, making MAX708CSA ideal for applications requiring only reset supervision and power-fail warning.
What is the minimum supply voltage at which MAX708CSA guarantees valid RESET output?
The MAX708CSA guarantees valid active-high RESET output down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.0V, RESET remains a valid logic high with sink capability of 50µA. This feature ensures robust reset assertion during deep brownout or battery backup conditions where other supervisors may fail.
Can the MAX708CSA monitor voltages other than the main VCC supply?
Yes, the MAX708CSA can monitor secondary supplies using its PFI (Power-Fail Input) pin, which compares an external voltage against an internal 1.25V reference. By connecting a resistor divider from the target supply to PFI, users can configure detection thresholds for 3.3V, 12V, or negative rails. The datasheet provides design examples for both positive and negative voltage monitoring, confirming this capability for the MAX708CSA.
What is the function of Pin 6 (N.C.) on the MAX708CSA?
Pin 6 on the MAX708CSA is designated N.C. (No Connect) and is not internally bonded. The datasheet explicitly states that this pin must remain unconnected in PCB layout. It replaces the WDI pin found on MAX705/MAX706 variants and serves no electrical function - ensuring pin compatibility while removing unused watchdog circuitry. Connecting Pin 6 risks undefined behavior or latch-up.
MAX708CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
MAX708CSA FAQ
1.How can I place an order for MAX708CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708CSA 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 reliable?
The price and inventory of MAX708CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708CSA is usually 5 days.
3.What payment methods are accepted for MAX708CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708CSA?
MAX708CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708CSA 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?
For technical support, including MAX708CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708CSA requirements.
6.How does Aetrix verify that MAX708CSA is sourced from the original manufacturer or authorized distributors?
All MAX708CSA 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 meets industry standards.
7.What is the process for return or replacement of MAX708CSA?
All MAX708CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708CSA, 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 part is unused and in its original packaging.
Return procedure for MAX708CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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