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Analog Devices Inc./Maxim Integrated MAX706SCSA+
- Part No.:
- MAX706SCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706SCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,150
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Product details
Overview
MAX706SCSA+ from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation during power-up/down/brownout (2.93V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input. It operates in 0°C to +70°C range and is used in portable instruments and battery-powered controllers requiring reliable power monitoring.
For engineers reviewing the MAX706SCSA+ datasheet, MAX706SCSA+ pinout, MAX706SCSA+ application, or MAX706SCSA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Maxim's official specifications for the SO-8 packaged MAX706S variant.
Technical Context
The MAX706SCSA+ integrates a precision voltage monitor with 2.93V reset threshold (±1.5% tolerance), a 200ms reset pulse width generator, and a dedicated watchdog timer that resets on WDI edge transitions within 1.6s. Its PFI input connects to an internal 1.25V reference for configurable power-fail detection.
It features TTL/CMOS-compatible MR input with 500ns minimum pulse width at VCC = 3V, guaranteed RESET assertion down to VCC = 1V, and 100µA quiescent current. The active-low RESET output remains asserted for ≥200ms after VCC rises above threshold or MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset assertion before µP brownout in +3.3V systems |
| Reset Pulse Width | 200ms minimum; guarantees sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±40%; provides deterministic firmware supervision without false triggers |
| Quiescent Current | 100µA max at VCC = 3.3V; enables long battery life in portable equipment |
| Power-Fail Threshold | 1.25V (PFI input); supports adjustable low-battery or unregulated supply monitoring via external divider |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded control and instrumentation |
| VCC Range | 3.0V to 5.5V; compatible with both +3.3V logic rails and legacy +5V µP systems |
Pinout & Package
MAX706SCSA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mountable with standard 1.27mm pitch. Pin 1 is marked with a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-Low Manual Reset Input | TTL/CMOS-compatible; pull below 0.6V to assert RESET; internally pulled up with ~70µA source |
| 2 (VCC) | Supply Voltage Input | Accepts 3.0V–5.5V; powers all internal circuits including reset generator and watchdog |
| 3 (GND) | Ground Reference | Common return path for all analog and digital functions; must be low-impedance |
| 4 (PFI) | Power-Fail Comparator Input | Connects to external resistive divider; asserts PFO when voltage falls below 1.25V |
| 5 (PFO) | Active-Low Power-Fail Output | Sinks current when PFI < 1.25V; used for early-warning interrupt or secondary reset trigger |
| 6 (WDI) | Watchdog Input | Edge-sensitive; requires transition every ≤1.6s to prevent WDO assertion; disables when open/tri-stated |
| 7 (WDO) | Active-Low Watchdog Output | Goes low on timeout or VCC brownout; not synchronized to RESET; can drive NMI or MR |
| 8 (RESET) | Active-Low Reset Output | Asserted when VCC < 2.93V or MR low; held low ≥200ms after recovery; drives µP reset pin directly |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset behavior even during deep undervoltage conditions |
| Debounced MR input with 140ms min pulse width | Eliminates need for external RC debounce circuitry in pushbutton applications |
| WDI disable on high-impedance state | Allows safe watchdog deactivation during µP sleep or tri-state I/O modes |
| 1.25V precision internal reference for PFI | Enables accurate, temperature-stable power-fail or low-battery warning without external reference |
| 20mV reset threshold hysteresis | Prevents oscillation during slow VCC ramp-up or noisy supply conditions |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by dual AA cells with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and battery voltage via PFI divider; asserts RESET on brownout and triggers orderly shutdown via PFO interrupt. Use Value: Prevents corrupted EEPROM writes and ensures consistent boot state across battery discharge cycles (2.93V threshold matches typical Li-ion cutoff). |
Use Scenario: PLC I/O module with ARM Cortex-M4 MCU operating from 3.3V LDO. IC Role / Device Role / Timing Role: Provides power-on reset, watchdog supervision of firmware execution, and failsafe response to 24V field supply dropout via PFI network. Use Value: Eliminates need for discrete reset IC + comparator + timer; reduces BOM count while guaranteeing 200ms reset hold time per IEC 61000-4-2 immunity requirements. |
| Embedded Computing Systems | Critical µP Power Monitoring |
Use Scenario: Fanless industrial PC using Intel Atom x5-E3930 with +3.3V and +5V rails. IC Role / Device Role / Timing Role: Monitors +3.3V core supply (MAX706SCSA+) and +5V peripheral rail (separate supervisor); coordinates reset sequencing via shared MR line. Use Value: Enables independent reset timing for different voltage domains while maintaining tight synchronization (<50ns skew between RESET assertions). |
Use Scenario: Medical infusion pump controller where µP must never execute undefined code due to supply instability. IC Role / Device Role / Timing Role: Primary reset generator with 2.93V threshold and 200ms pulse; WDO connected to MR to force hard reset on firmware hang. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring deterministic reset under all fault conditions, including VCC sag and code lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA+ | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range | Required for outdoor or factory-floor deployments where ambient exceeds +70°C | Select MAX706SESA+ when extended temperature operation is mandatory; otherwise MAX706SCSA+ suffices for commercial environments. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 200ms delay, no watchdog, lower 12µA quiescent current | Lacks watchdog and PFI comparator; suited for simple reset-only applications with ultra-low power budget | Choose TPS3808G33DBVR only if watchdog and power-fail warning are unnecessary and sub-20µA IQ is critical. |
Compared with MAX706SESA+, MAX706SCSA+ offers identical electrical performance at lower cost and smaller inventory footprint for commercial-temperature designs; compared with TPS3808G33DBVR, it provides essential watchdog supervision and flexible PFI monitoring at the expense of higher quiescent current.
Availability
MAX706SCSA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial microcontroller controllers requiring stable component supply across commercial temperature grades.
Supply support for MAX706SCSA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX706 family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing integrated reset, watchdog, and power-fail monitoring in a single 8-pin package.
FAQ
What is the reset threshold voltage of the MAX706SCSA+?
The MAX706SCSA+ has a nominal reset threshold of 2.93V (VCC falling), with ±1.5% tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table for the 'S' suffix variant. The threshold ensures reliable reset assertion before most +3.3V µPs enter undefined operation during brownout. MAX706SCSA+ maintains this exact threshold across its full 0°C to +70°C operating range.
Does the MAX706SCSA+ include a watchdog timer function?
Yes, the MAX706SCSA+ includes a watchdog timer with a nominal timeout period of 1.6s. A rising or falling edge on the WDI pin must occur within this window to prevent WDO from asserting low. The watchdog function is fully operational and cannot be disabled - unlike the 'A' variants (e.g., MAX706AS), the MAX706SCSA+ does not support WDI high-impedance disable mode. This makes it ideal for applications requiring always-active supervision.
Can the MAX706SCSA+ monitor a secondary power supply like +12V?
Yes, the MAX706SCSA+ can monitor voltages beyond VCC using its PFI (Power-Fail Input) pin. By connecting PFI to a resistive divider from the +12V rail, the internal 1.25V comparator triggers PFO when the divided voltage falls below threshold. For example, a 130kΩ/1kΩ divider yields ~1.25V at PFI when +12V drops to ~11V. This enables early-warning detection of auxiliary supply failure without additional ICs.
What is the minimum pulse width required on the MR pin of the MAX706SCSA+?
The MR (Manual Reset) input of the MAX706SCSA+ requires a minimum pulse width of 500ns when VCC = 3.0V, and 150ns when VCC = 5.0V. This specification is guaranteed across temperature and ensures reliable reset triggering from pushbuttons or logic signals. The internal 70µA pull-up eliminates need for external resistor, and the input is TTL/CMOS-compatible at both supply voltages.
Is the MAX706SCSA+ pin-compatible with other MAX706 variants?
Yes, the MAX706SCSA+ is pin-compatible with all members of the MAX706P/R/S/T and MAX706AP/AR/AS/AT families in the same SO-8 package (S8-2). It shares identical pinout, electrical interface, and functional block diagram with MAX706RCSA+, MAX706TCSA+, and MAX706APCSA+. The only differences are reset threshold voltage (2.93V for 'S'), watchdog enable status, and temperature grade - all transparent to PCB layout.
MAX706SCSA+ 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:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706SCSA+ FAQ
1.How can I place an order for MAX706SCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706SCSA+ 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 MAX706SCSA+ reliable?
The price and inventory of MAX706SCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706SCSA+ is usually 5 days.
3.What payment methods are accepted for MAX706SCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706SCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706SCSA+?
MAX706SCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706SCSA+ 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 MAX706SCSA+?
For technical support, including MAX706SCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706SCSA+ requirements.
6.How does Aetrix verify that MAX706SCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX706SCSA+ 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 MAX706SCSA+ meets industry standards.
7.What is the process for return or replacement of MAX706SCSA+?
All MAX706SCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706SCSA+, 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 MAX706SCSA+ part is unused and in its original packaging.
Return procedure for MAX706SCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX706SCSA+ Tags
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