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Analog Devices Inc./Maxim Integrated MAX708SCSA
- Part No.:
- MAX708SCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708SCSA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:62,453
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Product details
Overview
MAX708SCSA from Maxim Integrated is an active-low, dual-output microprocessor supervisory circuit designed for +3V to +5V systems. It provides precision reset assertion at 2.93V VCC threshold, guaranteed RESET assertion down to VCC = 1V, 200ms reset pulse width, and a dedicated power-fail comparator with 1.25V internal reference-used in battery-powered instrumentation for brownout protection and orderly shutdown.
For engineers reviewing the MAX708SCSA datasheet, MAX708SCSA pinout, MAX708SCSA application, or MAX708SCSA equivalent, this device serves as a voltage-monitoring watchdog-free supervisor with simultaneous active-high and active-low reset outputs, critical for deterministic µP initialization in portable controllers and embedded industrial sensors requiring fail-safe power sequencing.
Technical Context
The MAX708SCSA implements a dual-reset generator with independent timing logic ensuring both RESET (active-low) and RESET (active-high) outputs deassert synchronously after a fixed 200ms delay following VCC rise above 2.93V. Its power-fail comparator uses a precision 1.25V bandgap reference with 10mV hysteresis to drive PFO independently of the main reset path.
No watchdog timer is present-unlike MAX706 variants-making it suitable for applications where software supervision is handled externally or unnecessary. The MR input is TTL/CMOS-compatible with 500ns minimum pulse width at VCC = 3V and features internal 70µA pull-up current, enabling direct pushbutton interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset initiation before µP supply dropout in +3.3V systems |
| Reset Pulse Width | 200ms typical; guarantees sufficient time for µP core and peripherals to stabilize post-power-up |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during deep brownout and compatibility with +3V/+5V mixed-rail designs |
| Quiescent Current | 100µA max at VCC = 3.3V; enables multi-year battery life in always-on portable instruments |
| PFI Threshold | 1.25V ±5%; provides stable low-battery or unregulated supply monitoring with minimal external components |
| RESET Assertion Level | Guaranteed to VCC = 1V; maintains valid logic-low output even during severe undervoltage conditions |
| Package | 8-pin SO (S8-2); industry-standard surface-mount footprint compatible with automated PCB assembly |
Pinout & Package
MAX708SCSA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per package code S8-2, with 1.27mm lead pitch and JEDEC MS-012AC compliance. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; debounced by 200ms reset timer |
| 2 VCC | Positive supply input | Accepts 1.2V–5.5V; powers all internal comparators, timers, and output drivers |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-fail comparator input | High-impedance node (±25nA leakage); compares against internal 1.25V reference |
| 5 PFO | Active-low power-fail output | Open-drain output sinking ≥1.2mA; asserts when PFI < 1.25V for early warning signaling |
| 6 RESET | Active-low reset output | Push-pull driver; asserted low during power-up/brownout; holds for full 200ms after recovery |
| 7 RESET | Active-high reset output | Complementary push-pull output; high during reset, low otherwise; eliminates need for external inverter |
| 8 N.C. | No connection | Not bonded; must remain unconnected on PCB to avoid parasitic coupling or ESD risk |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate external level-shifting or inversion |
| Precision 2.93V reset threshold | Matches +3.3V µP supply tolerance (±3%); avoids false resets during nominal operation |
| 1.25V power-fail comparator | Enables battery voltage monitoring or unregulated rail supervision with no external reference needed |
| 200ms reset timeout | Meets Intel and ARM µP reset timing requirements for clock stabilization and memory initialization |
| Guaranteed reset to VCC = 1V | Ensures deterministic behavior during deep brownout-critical for data retention in nonvolatile systems |
| 8-pin SO package | Standardized footprint reduces layout complexity and supports reflow soldering in high-volume production |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose monitor operating from single Li-ion cell with variable discharge curve. IC Role / Device Role / Timing Role: Supervises VCC and triggers controlled shutdown when battery drops below 2.93V; PFI monitors cell voltage via resistor divider for preemptive alert at 3.0V. Use Value: Prevents corrupted sensor readings and flash write errors by asserting both RESET and RESET before supply collapse. |
Use Scenario: DIN-rail mounted I/O module powered by 24VDC-to-3.3V isolated converter with transient susceptibility. IC Role / Device Role / Timing Role: Detects 3.3V rail brownout and asserts synchronized reset to FPGA and ADC; PFO feeds fault signal to host controller. Use Value: Eliminates spurious I/O state changes during line transients by guaranteeing 200ms reset hold time and dual-signal compatibility with legacy and modern µPs. |
| Smart Energy Meters | Ruggedized Handheld Testers |
|
Use Scenario: ANSI C12.20-compliant meter with backup supercapacitor and real-time clock. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts RESET/RESET to halt计量 firmware; PFO initiates RTC switchover to backup power. Use Value: Ensures metrological integrity by preventing partial writes to EEPROM during power loss-enabled by guaranteed reset assertion to 1V. |
Use Scenario: Field-deployed multimeter with auto-ranging analog front-end and ARM Cortex-M4. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery swap or cold temperature startup; MR pin accepts tactile switch for user-initiated calibration reset. Use Value: Achieves >100,000-cycle mechanical reliability with debounced MR input and no external RC network required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCSA | Single active-low RESET output only; no RESET; identical 2.93V threshold and 200ms timing | Lacks complementary reset signal-requires external inverter for active-high interface | Select when board space is constrained and only one reset polarity is needed |
| TPS3808G33DBVR | TI part with 3.3V threshold, 200ms delay, and open-drain RESET; no dual-output capability | Requires external pull-up for active-high logic; lacks integrated PFI/PFO comparator | Choose for TI-centric BOMs or when lower quiescent current (1.8µA) outweighs missing PFO functionality |
Compared with MAX706SCSA, MAX708SCSA adds critical dual-polarity reset signaling without increasing footprint or cost-enabling drop-in upgrades in existing designs. Versus TPS3808G33DBVR, MAX708SCSA delivers integrated power-fail detection and guaranteed sub-1V operation, essential for robust field-deployed equipment.
Availability
MAX708SCSA is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and ruggedized handheld testers requiring stable component supply across extended product lifecycles.
Supply support for MAX708SCSA 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, automotive, and communications applications.
The MAX708 family targets cost-sensitive, space-constrained µP supervisory needs in battery-powered and embedded systems-emphasizing reliability, low power, and dual-output flexibility without watchdog complexity.
FAQ
What is the reset threshold voltage for MAX708SCSA?
The MAX708SCSA has a precise reset threshold of 2.93V (VCC falling), with ±15mV tolerance over temperature. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The threshold is optimized for +3.3V µP systems and ensures reset assertion well before supply dropout, making MAX708SCSA suitable for applications where stable initialization under marginal voltage conditions is critical.
Does MAX708SCSA include a watchdog timer function?
No, MAX708SCSA does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family omits WDI and WDO pins entirely-replacing them with the second reset output (RESET). This simplifies design for systems where software-level supervision is implemented externally or deemed unnecessary, reducing component count and eliminating potential watchdog-related timing conflicts in MAX708SCSA deployments.
How does the power-fail comparator in MAX708SCSA work?
The MAX708SCSA power-fail comparator uses an internal 1.25V reference to monitor the PFI pin. When PFI voltage falls below 1.25V, the open-drain PFO output pulls low-providing early warning of impending supply failure. The comparator includes 10mV hysteresis to prevent chatter near the trip point. No external reference is needed, and PFI leakage is limited to ±25nA, enabling high-impedance resistive divider networks for flexible voltage monitoring in MAX708SCSA circuits.
Can MAX708SCSA operate down to 1V supply voltage?
Yes, MAX708SCSA guarantees RESET output assertion down to VCC = 1V, a key specification confirmed in the Electrical Characteristics table. Below 1V, the RESET output becomes high-impedance, but the guaranteed behavior to 1V ensures deterministic reset control during deep brownout events. This feature directly supports reliable operation in battery-powered devices nearing end-of-life, distinguishing MAX708SCSA from many competing supervisors.
What is the function of the N.C. pin on MAX708SCSA?
Pin 8 of MAX708SCSA is designated N.C. (No Connection)-it is not internally bonded and must remain unconnected on the PCB. Connecting this pin risks introducing noise coupling, ESD paths, or unintended parasitic capacitance that could affect PFO or RESET timing integrity. The MAX708SCSA datasheet explicitly states this terminal is unused, and proper layout requires leaving it floating with no trace or pad connection.
MAX708SCSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- 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
MAX708SCSA FAQ
1.How can I place an order for MAX708SCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SCSA 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 MAX708SCSA reliable?
The price and inventory of MAX708SCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SCSA is usually 5 days.
3.What payment methods are accepted for MAX708SCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SCSA?
MAX708SCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SCSA 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 MAX708SCSA?
For technical support, including MAX708SCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SCSA requirements.
6.How does Aetrix verify that MAX708SCSA is sourced from the original manufacturer or authorized distributors?
All MAX708SCSA 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 MAX708SCSA meets industry standards.
7.What is the process for return or replacement of MAX708SCSA?
All MAX708SCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SCSA, 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 MAX708SCSA part is unused and in its original packaging.
Return procedure for MAX708SCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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