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Analog Devices Inc./Maxim Integrated MAX708CSA+T
- Part No.:
- MAX708CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708CSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
MAX708CSA+T from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, 4.40V supply-voltage monitoring, 1.25V power-fail comparator input, and manual-reset input - all in an 8-pin SO package. It ensures reliable μP startup and brownout protection for embedded controllers and industrial instrumentation requiring stable +5V system supervision.
For engineers reviewing the MAX708CSA+T datasheet, MAX708CSA+T pinout, MAX708CSA+T application, or MAX708CSA+T equivalent, this page delivers verified technical context, real-world timing behavior (200ms reset pulse, 1.6s watchdog timeout), voltage threshold accuracy (±150mV hysteresis), and validated alternative options for critical power-monitoring designs.
Technical Context
The MAX708CSA+T implements a precision bandgap-based voltage monitor with 4.40V reset threshold and 40mV hysteresis, guaranteeing reset assertion during brownout while preventing chatter near threshold. Its internal 250μA MR pull-up enables direct pushbutton interfacing without external components.
It integrates a dedicated power-fail comparator with 1.25V reference and nanosecond-scale response (400ns assertion/de-assertion), supporting early-warning detection for +5V or scaled supply rails. Unlike watchdog-equipped variants, MAX708 substitutes active-high RESET for WDO - eliminating watchdog functionality but simplifying reset-only implementations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when VCC drops below nominal +5V rail, ensuring safe μP halt before logic corruption |
| Reset Pulse Width | 200ms minimum - provides sufficient time for μP initialization and peripheral stabilization after power recovery |
| Supply Voltage Range | 1.0V to 5.5V - guarantees RESET validity down to 1.0V VCC, enabling operation during deep brownout |
| Power-Fail Input Threshold | 1.25V ±50mV - enables accurate low-battery or auxiliary supply monitoring via external resistor divider |
| Manual-Reset Input Current | 250μA internal pull-up - allows direct switch connection without external biasing; TTL/CMOS-compatible |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems including industrial controllers and test equipment |
| Package | 8-pin SO (Small Outline) - RoHS-compliant, surface-mountable, footprint compatible with industry-standard 150mil SOIC land pattern |
Pinout & Package
MAX708CSA+T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead finish. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Triggers 200ms active-high RESET pulse when pulled below 0.8V; internally pulled up at 250μA |
| 2 VCC | +5V supply input | Primary power source; reset remains valid down to 1.0V; supports 1.0–5.5V operating range |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection |
| 4 PFI | Power-fail input | Compares against 1.25V internal reference; asserts PFO low when voltage falls below threshold |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; used for interrupt generation or cascaded reset triggering |
| 6 N.C. | No connect | Internally unconnected; must remain floating or tied to GND per layout best practice |
| 7 RESET | Active-high reset output | Push-pull output; drives high during normal operation, pulses low only during reset assertion |
| 8 WDO | Watchdog output | Not present on MAX708 - pin is unused; differs from MAX705/MAX706 which implement watchdog timer |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1.0V | Ensures deterministic reset state even during severe brownout, preventing undefined μP behavior |
| Debounced manual-reset input | 140ms minimum pulse width eliminates need for external RC filtering or firmware debouncing |
| Precision 4.40V reset threshold with 40mV hysteresis | Prevents oscillatory reset assertion near threshold; meets tight tolerance requirements for +5V systems |
| 1.25V power-fail comparator with 400ns response | Enables fast, reliable early-warning detection of supply degradation before main rail collapse |
| SO-8 RoHS-compliant packaging | Supports automated SMT assembly; compatible with standard reflow profiles (260°C peak for Pb-free) |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Real-time control loop execution in programmable logic controllers exposed to fluctuating 24VDC-derived +5V supplies. IC Role / Device Role / Timing Role: Supervises +5V rail integrity and provides clean, glitch-free active-high reset to ARM Cortex-M7 MCU on power-up and brownout. Use Value: Prevents spurious I/O activation during undervoltage by holding MCU in reset until VCC stabilizes above 4.40V for ≥200ms. |
Use Scenario: Battery-backed data acquisition module in portable ultrasound units requiring fail-safe shutdown before Li-ion voltage drops below 3.0V. IC Role / Device Role / Timing Role: Monitors scaled-down battery voltage via PFI; asserts PFO to trigger controlled memory save and power-down sequence. Use Value: Uses 1.25V comparator reference with external resistor network to detect 3.0V battery threshold with ±2% accuracy. |
| Smart Energy Meter | Automotive Telematics Gateway |
Use Scenario: Revenue-grade electricity meter operating from split-phase AC with isolated DC-DC converter supplying +5V logic rail. IC Role / Device Role / Timing Role: Detects primary supply failure and initiates secure flash write of last valid kWh reading using PFO-triggered interrupt. Use Value: 400ns PFI-to-PFO response ensures interrupt occurs before backup capacitor discharges below μP operational minimum. |
Use Scenario: CAN-connected vehicle gateway powered from 12V automotive battery with transient-heavy environment. IC Role / Device Role / Timing Role: Provides robust reset supervision for dual-core application processor, rejecting noise-induced false resets via 40mV hysteresis. Use Value: 4.40V threshold aligns with automotive +5V regulator dropout specification; 200ms pulse exceeds processor's minimum reset hold time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CSA+T | Same 8-pin SO package and 4.65V reset threshold; includes both active-high and active-low reset outputs (RESET/RESET) | Required where legacy μP demands active-low reset signal (e.g., Intel 80C51) alongside active-high interface | Select MAX707CSA+T only if dual-polarity reset signaling is needed; otherwise MAX708CSA+T offers simpler interface and lower cost |
| MAX813LCSA+ | 4.65V reset threshold, 1.6s watchdog timeout, active-high RESET only - no WDO pin; identical pinout except WDO replaced by N.C. | Suitable for systems needing watchdog supervision but not requiring separate watchdog output signal routing | Choose MAX813LCSA+ when watchdog timer functionality is required and WDO signal is unnecessary; MAX708CSA+T excludes watchdog entirely |
Compared with MAX707CSA+T and MAX813LCSA+, the MAX708CSA+T provides the narrowest functional scope - optimized purely for active-high reset and power-fail warning without watchdog or dual-output complexity - making it ideal for cost-sensitive, space-constrained applications where those features add no value.
Availability
MAX708CSA+T is available at Aetrix Electronics and suitable for industrial controllers, medical diagnostic instruments, smart energy meters, and automotive telematics gateways requiring stable component supply across production lifecycles.
Supply support for MAX708CSA+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 demanding industrial, computing, and communications applications.
The MAX705–MAX708/MAX813L family delivers integrated μP supervisory functions - reset generation, power-fail detection, and manual reset - targeting cost-sensitive embedded systems requiring high reliability and minimal board space.
FAQ
What is the reset threshold voltage for MAX708CSA+T?
The MAX708CSA+T has a nominal reset threshold of 4.40V, with guaranteed limits of 4.25V (min) and 4.50V (max) over temperature. This threshold applies to the VCC supply line and triggers the active-high RESET output when voltage falls below the specified level, ensuring μP remains held in reset during brownout conditions.
Does MAX708CSA+T include a watchdog timer function?
No, the MAX708CSA+T does not include a watchdog timer. Unlike the MAX705/MAX706/MAX813L, the MAX708 replaces the watchdog input/output (WDI/WDO) with a no-connect (N.C.) pin and active-high RESET output. Its function set is limited to supply monitoring, manual reset, and power-fail detection - confirmed by pin configuration tables and block diagrams in the official datasheet.
What is the minimum VCC voltage at which MAX708CSA+T guarantees valid RESET output?
The MAX708CSA+T guarantees valid RESET output down to VCC = 1.0V. At this voltage, the active-high RESET output remains functional and can drive its load with specified sink/source capability, enabling reliable reset assertion even during deep brownout events before full power loss.
Can MAX708CSA+T monitor voltages other than +5V?
Yes, the MAX708CSA+T can monitor auxiliary voltages using the PFI pin and its internal 1.25V comparator reference. By connecting a resistor divider from the target supply to PFI, users can scale any voltage (e.g., +12V, +3.3V, or battery rails) to fall within the 1.25V detection window - a method explicitly documented in the Applications Information section of the datasheet.
What package type and RoHS status does MAX708CSA+T use?
The MAX708CSA+T uses an 8-pin SO (Small Outline) package with 1.27mm pitch and is RoHS-compliant and lead(Pb)-free. The "+" suffix in the part number explicitly denotes lead-free/RoHS packaging, and the device meets JEDEC J-STD-020 reflow specifications with a peak temperature of +260°C.
MAX708CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX708CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708CSA+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 MAX708CSA+T reliable?
The price and inventory of MAX708CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708CSA+T is usually 5 days.
3.What payment methods are accepted for MAX708CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708CSA+T?
MAX708CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708CSA+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 MAX708CSA+T?
For technical support, including MAX708CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708CSA+T requirements.
6.How does Aetrix verify that MAX708CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX708CSA+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 MAX708CSA+T meets industry standards.
7.What is the process for return or replacement of MAX708CSA+T?
All MAX708CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708CSA+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 MAX708CSA+T part is unused and in its original packaging.
Return procedure for MAX708CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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