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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:2,678
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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 power-on reset, watchdog timeout (1.6s), 2.93V supply-voltage monitoring, and a 1.25V power-fail comparator input-used in portable instruments and battery-powered controllers to prevent code execution errors during brownout.
For engineers reviewing the MAX706SCSA datasheet, MAX706SCSA pinout, MAX706SCSA application, or MAX706SCSA equivalent, key selection criteria include its 2.93V reset threshold, guaranteed RESET assertion down to VCC = 1V, 200ms reset pulse width, and SO-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX706SCSA implements a precision voltage monitor with 20mV hysteresis and guarantees RESET assertion while VCC ≥ 1V, enabling reliable startup in low-voltage battery scenarios. Its internal 1.25V reference drives the PFI/PFO comparator for independent power-fail or low-battery warning generation.
It features a debounced TTL/CMOS-compatible manual-reset input (MR) with 500ns minimum pulse width at VCC = 3V, and a watchdog timer that resets on WDI transition and asserts WDO low after 1.6s timeout-disabled only when WDI is left open or connected to a high-impedance tri-state output with leakage < 600nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset activation before µP operational voltage collapse in +3.3V systems |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; balances fault detection responsiveness with tolerance for brief µP stalls |
| Supply Current | 100µA typical at VCC = 3.3V; enables long battery life in portable instrumentation |
| PFI Threshold | 1.25V ±0.05V; supports configurable power-fail detection via external resistive divider |
| Operating Voltage Range | 2.7V to 5.5V; compatible with both +3V battery and +5V adapter operation |
| Quiescent Current | 100µA max at TA = +85°C; maintains low system standby power without derating |
Pinout & Package
MAX706SCSA is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible with standard reflow profiles and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced TTL/CMOS-compatible signal; internally pulled up with 70µA current; triggers 200ms reset pulse when pulled below 0.6V |
| 2 VCC | Positive supply input | Accepts 2.7V–5.5V; powers all internal circuits including reset generator, watchdog, and comparator |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | High-impedance node referenced to internal 1.25V; used with external resistor divider to detect auxiliary supply faults |
| 5 PFO | Active-low power-fail output | Sinks current when PFI < 1.25V; signals µP to initiate orderly shutdown before main supply collapse |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; disables automatically if left open or high-Z |
| 7 RESET | Active-low reset output | Asserted low during power-up, brownout, or MR activation; remains low for 200ms after recovery |
| 8 WDO | Active-low watchdog output | Asserted low on watchdog timeout or VCC drop below 2.93V; deasserts immediately upon VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during deep battery discharge or slow power ramp-up |
| WDI disable on high-impedance state | Eliminates unintended watchdog triggering when µP is in sleep or tri-state I/O mode |
| 20mV reset threshold hysteresis | Prevents oscillatory reset assertion near trip point under noisy or slowly varying supply conditions |
| 100nA max PFI input current | Minimizes loading error in external resistive dividers, preserving accuracy of power-fail detection |
| 200ms reset delay with no external components | Reduces BOM count and layout area versus RC-based reset timers requiring precision capacitors |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Controllers |
|---|---|
|
Use Scenario: Handheld multimeter operating from single 3.7V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and low-battery warning via PFI monitoring cell voltage through resistive divider. Use Value: Prevents corrupted EEPROM writes during voltage sag; extends usable battery range by asserting reset only below 2.93V while maintaining operation down to 2.7V. |
Use Scenario: PLC I/O module powered by isolated +3.3V DC-DC converter with unregulated +24V field supply. IC Role / Device Role / Timing Role: Dual-monitoring supervisor using RESET for µP reset and PFO to trigger MR on +24V rail collapse. Use Value: Enables coordinated shutdown of digital logic and analog front-end before field power loss disrupts sensor readings. |
| Embedded Computing Systems | Critical µP Power Monitoring |
|
Use Scenario: Fanless industrial PC with +3.3V core and +5V I/O rails, subject to thermal throttling-induced voltage droop. IC Role / Device Role / Timing Role: Primary reset supervisor asserting RESET during VCC dip and generating NMI via WDO to log thermal events. Use Value: Provides deterministic restart after transient droop without requiring BIOS-level watchdog integration. |
Use Scenario: Medical infusion pump controller where firmware integrity must be guaranteed across battery swap cycles. IC Role / Device Role / Timing Role: Safety-critical supervisor ensuring µP remains held in reset until VCC stabilizes above 2.93V for ≥200ms post-power-up. Use Value: Meets IEC 62304 Class C software safety requirements by eliminating race conditions during power sequencing. |
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 vs. 0°C to +70°C for MAX706SCSA | Required for outdoor or thermally demanding enclosures; not suitable for cost-sensitive commercial-grade devices | Select MAX706SESA when extended temperature operation is mandatory; otherwise MAX706SCSA suffices for indoor consumer/industrial use. |
| TPS3808G125DBVR | TI part with 1.25V fixed reset threshold, no PFI/PFO comparator, and 300ms reset delay; lacks watchdog function entirely | Only suitable for basic reset-only applications; cannot replace MAX706SCSA in designs requiring power-fail warning or watchdog supervision | Choose TPS3808G125DBVR only if watchdog and PFI functions are unused; MAX706SCSA remains necessary for full feature parity. |
Compared with MAX706SESA, MAX706SCSA trades extended temperature capability for lower cost and qualification in commercial environments; compared with TPS3808G125DBVR, it delivers integrated watchdog and dual-threshold monitoring essential for robust µP supervision in battery-backed systems.
Availability
MAX706SCSA is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial microcontroller controllers requiring stable component supply across production lifecycles.
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, communications, and computing markets.
The MAX706 family was designed specifically for low-cost, high-reliability microprocessor supervision in space- and power-constrained embedded systems operating from +3V/+3.3V supplies.
FAQ
What is the reset threshold voltage of the MAX706SCSA?
The MAX706SCSA has a nominal reset threshold of 2.93V (VCC falling), with ±70mV tolerance over temperature and supply. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The 20mV hysteresis prevents chatter near the trip point. MAX706SCSA's threshold is distinct from other variants like MAX706RCSA (2.63V) and MAX706TCSA (3.08V), making it optimal for +3.3V systems where margin between supply and reset point must be balanced.
Does the MAX706SCSA include a watchdog timer function?
Yes, the MAX706SCSA includes a watchdog timer with a nominal timeout period of 1.6s. It monitors the WDI input for transitions and asserts the WDO output low if no edge occurs within that window. Unlike the MAX706P/R/S/T series, the MAX706SCSA belongs to the MAX706S variant group and thus supports WDI disable when left open or connected to a high-impedance tri-state output with leakage < 600nA-enabling safe operation during µP sleep modes.
Can the MAX706SCSA monitor a secondary power supply such as +12V?
Yes, the MAX706SCSA can monitor auxiliary supplies like +12V using its PFI input. By connecting PFI to a resistive divider from the +12V rail, the internal 1.25V comparator threshold allows setting custom trip points-for example, a 10.24V to 11.50V window for early-warning detection. The resulting PFO output can then drive MR to generate a system reset, enabling coordinated response to multiple rail failures without additional ICs.
What package type is used for the MAX706SCSA?
The MAX706SCSA is supplied in an 8-pin SO (Small Outline) package with lead-free finish and JEDEC-standard S8-2 footprint. Its 150mil body width, 1.27mm pitch, and gull-wing leads support automated assembly and IPC-7351-compliant PCB layout. This package offers superior thermal performance and smaller board area than the PDIP or µMAX alternatives in the same family.
Is the MAX706SCSA pin-compatible with other MAX706 variants?
Yes, all MAX706x variants-including MAX706SCSA, MAX706RCSA, and MAX706TCSA-are fully pin-compatible in the SO-8 package. They share identical pin functions (MR, VCC, GND, PFI, PFO, WDI, RESET, WDO), allowing direct substitution in designs where only the reset threshold differs. No PCB changes are required when swapping between S, R, or T suffixes, provided the application's voltage margin requirements align with the selected threshold.
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:
- Obsolete
- 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.
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