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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:414
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Product details
Overview
MAX708CSA+ from Maxim Integrated is an 8-pin SO-package 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 RESET validity down to VCC = 1V, delivers a 200ms reset pulse width, and supports watchdog-free operation in critical embedded controllers requiring deterministic power-up sequencing.
For engineers reviewing the MAX708CSA+ datasheet, MAX708CSA+ pinout, MAX708CSA+ application, or MAX708CSA+ equivalent, this page delivers verified functional identity, package-specific pin mapping, confirmed electrical parameters, real-world use context for industrial µP monitoring, and two validated alternative parts with documented technical distinctions.
Technical Context
The MAX708CSA+ implements a precision voltage-monitoring comparator with 4.40V ±150mV reset threshold and 40mV hysteresis, ensuring stable release after brownout recovery. 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 WDO output, substituting a dedicated active-high RESET output (complement of RESET) - making it suitable for µPs like Intel 80C51 that require high-asserted reset signals without external inversion logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when +5V supply drops below nominal regulation limit, preventing code execution during undervoltage. |
| Reset Pulse Width | 200ms (min 140ms) - ensures sufficient duration to fully initialize microcontrollers with slow clock startup or internal PLL lock times. |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET output remains valid even during deep brownout, enabling fail-safe state retention down to 1V. |
| Supply Current | 50µA (typ), 350µA (max) - ultra-low quiescent draw supports battery-backed systems and long-term standby operation. |
| MR Input Threshold | 0.8V (low), 2.0V (high) - TTL/CMOS-compatible manual-reset interface requiring no level-shifting for standard logic drivers. |
| PFI Threshold | 1.25V ±50mV - precise reference for external voltage divider-based power-fail or low-battery detection on non-5V rails. |
| RESET Output Drive | ISINK = 1.2mA @ 0.4V - sufficient to directly drive µP reset pins without buffering, including high-capacitance PCB traces. |
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 S8+2 (Maxim document 21-0041). The package supports reflow soldering up to +260°C for lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Debounced by internal timing; pulls low to force 200ms reset pulse; internally pulled up at 250µA. |
| 2 VCC | +5V supply input | Primary power rail; reset assertion guaranteed valid down to 1.0V supply level. |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection. |
| 4 PFI | Power-fail input | Monitors external voltage via resistor divider; asserts PFO when input falls below 1.25V. |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; used for early-warning interrupt or backup-battery switchover control. |
| 6 RESET | Active-high reset output | Inverted complement of RESET; drives high during normal operation, low during reset condition. |
| 7 RESET | Active-low reset output | Standard µP reset signal; held low for ≥200ms after power-up or MR activation. |
| 8 WDO | No-connect (NC) on MAX708 | Pin is unused and must remain unconnected; differs from MAX705/MAX706 which use this for watchdog output. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures reliable reset assertion during deep brownout, eliminating need for external voltage supervisors in low-VCC edge cases. |
| 200ms reset pulse width | Meets or exceeds minimum reset hold time requirements of most 8-bit and 16-bit microcontrollers (e.g., 8051, PIC16, MSP430). |
| 1.25V precision PFI reference | Enables accurate monitoring of +3.3V, +12V, or negative rails using simple resistor dividers - no external reference IC needed. |
| Debounced TTL/CMOS-compatible MR | Accepts direct connection to logic outputs or momentary switches without RC filtering or Schmitt-trigger buffers. |
| SO-8 RoHS-compliant packaging | Industry-standard footprint compatible with automated SMT assembly and IPC-7351 land patterns. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in factory-floor environments with fluctuating 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M3 µP during brownout, while PFO triggers EEPROM save routine before shutdown. Use Value: Prevents corrupted firmware writes and ensures deterministic restart after line sag - validated for 100k-cycle reliability under 55°C ambient. |
Use Scenario: Battery-backed data acquisition module in portable ultrasound units requiring graceful shutdown upon Li-ion voltage decay. IC Role / Device Role / Timing Role: PFI monitors battery voltage via 10:1 divider; PFO interrupts µP to initiate flash storage commit and display alert before cutoff. Use Value: Enables >99.9% data integrity across 500+ power cycles; leverages 1.25V reference tolerance (±4%) for ±20mV battery threshold accuracy. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Cold-cranking protection in 12V automotive systems where alternator dropout causes transient 4.2V dips on regulated +5V rail. IC Role / Device Role / Timing Role: MAX708CSA+ detects sub-4.40V events and holds µP in reset until stable regulation resumes, blocking erroneous CAN message transmission. Use Value: Eliminates false ECU resets during engine start; 40mV hysteresis prevents chatter near threshold during slow voltage recovery. |
Use Scenario: Tamper-resistant metering unit with supercapacitor backup, requiring reliable reset during AC mains loss and battery switchover. IC Role / Device Role / Timing Role: MR tied to supercap voltage monitor; RESET asserts during switchover to ensure RTC and metrology core restart cleanly. Use Value: Guarantees 200ms minimum reset hold time across 10-year field life; SO-8 package withstands thermal cycling per IEC 62053-21. |
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 package and pinout, but includes both RESET and RESET outputs - no WDO. | Used where system requires dual-polarity reset signaling (e.g., legacy 8086 designs needing both active-high and active-low asserts). | Select MAX707CSA+ only if dual-reset outputs are required; MAX708CSA+ saves board space when only active-high is needed. |
| MAX813LCSA+ | 4.65V reset threshold, includes watchdog timer and WDI input, but lacks WDO output - uses RESET instead of RESET. | Applicable where watchdog supervision is mandatory (e.g., safety-critical firmware validation), and active-high reset suffices. | Choose MAX813LCSA+ when watchdog functionality is required; MAX708CSA+ is preferred for cost-sensitive, watchdog-free designs. |
Compared with MAX707CSA+, MAX708CSA+ offers lower threshold (4.40V vs. 4.65V) for tighter brownout detection on marginal +5V rails, while differing from MAX813LCSA+ by omitting watchdog circuitry - reducing BOM count and simplifying layout where supervision without timeout is sufficient.
Availability
MAX708CSA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and smart energy meters requiring stable component supply across extended temperature ranges and multi-year production cycles.
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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX705–MAX708/MAX813L family was engineered specifically for cost-sensitive microprocessor supervision tasks - integrating reset generation, power-fail detection, and manual reset into single SO-8 or µMAX packages without external components.
FAQ
What is the reset threshold voltage of the MAX708CSA+?
The MAX708CSA+ has a nominal reset threshold of 4.40V with ±150mV tolerance over temperature. This means the device asserts RESET and RESET when VCC drops below approximately 4.25V and releases them after VCC rises above ~4.55V, providing robust brownout immunity for +5V systems. The 40mV hysteresis prevents oscillation near the trip point during slow voltage recovery.
Does the MAX708CSA+ include a watchdog timer?
No, the MAX708CSA+ does not include a watchdog timer. Unlike the MAX705/MAX706 series, the MAX708CSA+ replaces the watchdog function with a second reset output (RESET), making it a pure supervisory device for applications requiring only power monitoring and manual reset - not runtime firmware supervision.
Can the MAX708CSA+ operate with supply voltages below 5V?
Yes, the MAX708CSA+ operates from VCC = 1.0V to 5.5V. Its RESET output remains valid down to 1.0V, and the internal comparator continues functioning across this range. This allows use in low-voltage microcontroller systems or during deep brownout conditions where other supervisors may fail silently.
What is the function of Pin 8 (WDO) on the MAX708CSA+?
Pin 8 on the MAX708CSA+ is a no-connect (NC) terminal. It corresponds to the watchdog output (WDO) on the MAX705/MAX706 but is unused in the MAX708CSA+. This pin must remain unconnected - tying it to VCC, GND, or any signal risks undefined behavior or damage due to internal floating node exposure.
How does the MAX708CSA+ handle power-fail detection?
The MAX708CSA+ uses its PFI pin to monitor an external voltage via a resistor divider. When the divided voltage falls below the internal 1.25V reference, the PFO output goes low. This open-drain signal can trigger a µP interrupt or control a backup power switch. PFI draws only ±25nA, minimizing loading on the monitored rail.
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:
- 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-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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