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Analog Devices Inc./Maxim Integrated MAX706RCSA
- Part No.:
- MAX706RCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706RCSA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
MAX706RCSA from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing power-up/down/brownout reset (200ms delay), 1.6s watchdog timer, 1.25V power-fail comparator input (PFI), and debounced manual-reset input (MR). It features a 2.63V reset threshold and operates over 0°C to +70°C in 8-pin SO package - used in battery-powered instruments and embedded controllers requiring reliable µP reset assurance.
For engineers reviewing the MAX706RCSA datasheet, MAX706RCSA pinout, MAX706RCSA application, or MAX706RCSA equivalent, key selection criteria include its fixed 2.63V reset threshold, active-low RESET output, integrated watchdog with 1.6s timeout, PFI-based low-battery detection, and compatibility with TTL/CMOS logic levels across 2.7V–5.5V VCC range.
Technical Context
The MAX706RCSA integrates a precision voltage monitor with 20mV hysteresis, a monostable reset generator guaranteeing RESET assertion down to VCC = 1V, and a transition-triggered watchdog timer that resets on any WDI edge within 1.6s. Its PFI comparator uses an internal 1.25V reference to support external resistive dividers for custom power-fail or secondary supply monitoring.
Unlike the MAX706AP/AR variants, the MAX706RCSA's watchdog cannot be disabled - WDI must be actively toggled. The MR input sources 70µA internally and accepts pulses as short as 500ns at VCC = 3V, enabling robust pushbutton or logic-driven reset initiation without external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset assertion before µP brownout in +3.3V systems |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; detects firmware lockup or missed service interrupts in real-time applications |
| Supply Current | 100µA max at VCC = 3.3V; enables long battery life in portable instrumentation |
| PFI Threshold | 1.25V ±50mV; supports accurate low-battery warning or unregulated supply monitoring via external divider |
| Operating Voltage | 2.7V to 5.5V; compatible with both +3.3V and +5V µP rails without level-shifting |
| Quiescent Current | 100µA max; reduces standby power in always-on embedded systems |
Pinout & Package
MAX706RCSA is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compliant, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Active-low TTL/CMOS-compatible input; internally pulled up with 70µA source; triggers 200ms reset pulse when pulled below 0.6V |
| 2 | VCC | Main supply input (2.7V–5.5V); powers all internal circuits including reset generator and watchdog |
| 3 | GND | Ground reference for all analog and digital functions; must be low-impedance for stable threshold operation |
| 4 | PFI | Power-Fail Input; connects to external resistor divider; asserts PFO when voltage falls below 1.25V |
| 5 | PFO | Active-Low Power-Fail Output; open-drain, sinks current when PFI < 1.25V; used for NMI or system shutdown signaling |
| 6 | WDI | Watchdog Input; edge-sensitive (rising/falling); must toggle within 1.6s to prevent WDO assertion |
| 7 | RESET | Active-Low Reset Output; guaranteed low during VCC < 2.63V or MR low; remains low for 200ms after recovery |
| 8 | WDO | Active-Low Watchdog Output; goes low if WDI idle >1.6s or VCC drops below reset threshold; deasserts immediately upon VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during deep brownout or slow power ramp-down |
| Debounced MR input with 500ns minimum pulse width | Eliminates need for external RC debounce; supports direct switch or FPGA GPIO connection |
| 1.25V precision PFI reference with 10mV hysteresis | Prevents chatter on power-fail detection near trip point; enables stable early-warning signaling |
| Watchdog disable not supported | Ensures continuous supervision - no risk of accidental watchdog deactivation in safety-critical contexts |
| 200ms reset time delay with temperature stability | Meets µP reset timing requirements across full 0°C to +70°C operating range without calibration |
Applications
| Battery-Powered Instruments | Industrial Controllers |
|---|---|
|
Use Scenario: Portable multimeter powered by 3.7V Li-ion battery with DC-DC converter regulating to +3.3V. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET during battery voltage sag below 2.63V and triggering orderly shutdown via PFO when cell voltage drops to 3.2V (via PFI divider). Use Value: Prevents corrupted EEPROM writes and invalid ADC readings during low-power states; extends usable battery capacity by enabling graceful shutdown. |
Use Scenario: PLC I/O module with ARM Cortex-M4 MCU operating from +3.3V rail derived from industrial 24V supply. IC Role / Device Role / Timing Role: Provides brownout reset and watchdog supervision; WDO connected to MR to force reset on firmware hang, while PFI monitors auxiliary 5V logic rail. Use Value: Eliminates need for discrete reset IC + separate watchdog timer; reduces BOM count and PCB area in space-constrained DIN-rail modules. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
|
Use Scenario: Single-board computer using +3.3V core supply and +5V I/O supply, with BIOS-level reset coordination required. IC Role / Device Role / Timing Role: Generates synchronized active-low RESET signal for CPU and peripherals; MR tied to front-panel reset button; WDI driven by periodic timer interrupt. Use Value: Ensures deterministic boot sequence even during noisy power transitions; eliminates race conditions between power rail sequencing and reset release. |
Use Scenario: Medical infusion pump with fail-safe µP controlling motor and display, requiring ASIL-B-equivalent reliability. IC Role / Device Role / Timing Role: Primary reset supervisor with guaranteed VCC = 1V operation; PFO wired to safety controller to initiate emergency stop if main supply fails. Use Value: Meets IEC 62304 clause 5.4.2 for hardware-initiated safe state entry; provides independent reset path not dependent on software execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCSA | 2.93V reset threshold (vs. 2.63V); identical pinout, timing, and feature set | Suitable for +3.3V systems where higher reset margin is needed to avoid false triggers during transient dips | Select when system VCC nominal is ≥3.3V and brownout tolerance requires earlier reset assertion |
| MAX706TCSA | 3.08V reset threshold; otherwise functionally identical to MAX706RCSA | Used in +3.3V systems with tight supply regulation where reset must occur only near dropout | Choose for applications requiring maximum noise immunity on reset threshold, e.g., high-EMI industrial environments |
Compared with MAX706SCSA and MAX706TCSA, the MAX706RCSA offers the lowest reset threshold in the family, making it optimal for marginal +3V supply designs or battery-powered systems where early reset prevents erratic µP behavior during discharge.
Availability
MAX706RCSA is available at Aetrix Electronics and suitable for battery-powered instruments, industrial controllers, and embedded computing systems requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX706RCSA 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, automotive, and communications applications.
The MAX706 family was designed specifically for cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - targeting portable, medical, and industrial control equipment.
FAQ
What is the reset threshold voltage of the MAX706RCSA?
The MAX706RCSA has a fixed reset threshold of 2.63V (VCC falling), with ±70mV tolerance over temperature and supply. This value is laser-trimmed at wafer test and guaranteed across the 0°C to +70°C operating range. The MAX706RCSA asserts its active-low RESET output whenever VCC drops below this threshold and holds it low for 200ms after VCC rises above it. This threshold is specific to the 'R' suffix variant and differs from the S (2.93V) and T (3.08V) versions.
Does the MAX706RCSA support watchdog timer disable?
No, the MAX706RCSA does not support watchdog timer disable. Its WDI input is fully active - the watchdog timer resets on every rising or falling edge and asserts WDO low if no transition occurs within 1.6s. Unlike the MAX706AR/AS/AT variants, the MAX706RCSA lacks high-impedance detection logic; leaving WDI floating or connecting it to a tri-state output will cause immediate WDO assertion. For disable capability, consider MAX706ARCSA instead.
What is the minimum pulse width required on the MR input of the MAX706RCSA?
The MAX706RCSA requires a minimum MR pulse width of 500ns when VCC = 3.0V and 150ns when VCC = 5.0V. This specification is verified across temperature and process corners. The MR input is internally pulled up with a 70µA current source, making it compatible with open-drain logic or mechanical switches without external components. Pulses shorter than specified may not reliably trigger the 200ms reset pulse due to internal synchronization delays.
Can the MAX706RCSA monitor a negative supply voltage?
Yes, the MAX706RCSA can monitor a negative supply using its PFI input with an external resistor network as shown in Figure 8 of the datasheet. By referencing PFI to the negative rail and using appropriate R1/R2 values, the internal 1.25V comparator threshold allows detection of negative voltage droop. Accuracy depends on resistor tolerance, PFI input bias current (<25nA), and VCC stability. The PFO output will go high when the negative supply falls below the programmed trip point, enabling fault signaling in dual-rail systems.
What package type and footprint does the MAX706RCSA use?
The MAX706RCSA uses an 8-pin SO (Small Outline) package with JEDEC MS-012AC outline, 1.27mm lead pitch, and body dimensions of 4.9mm × 6.0mm. The package code is S8-2, and it is lead-free compliant. This footprint is compatible with standard SO-8 reflow profiles and matches industry-standard 8-pin SO footprints used for voltage supervisors, eliminating layout redesign when substituting within the MAX706 family.
MAX706RCSA 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:
- 2.63V
- 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
MAX706RCSA FAQ
1.How can I place an order for MAX706RCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706RCSA 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 MAX706RCSA reliable?
The price and inventory of MAX706RCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706RCSA is usually 5 days.
3.What payment methods are accepted for MAX706RCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706RCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706RCSA?
MAX706RCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706RCSA 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 MAX706RCSA?
For technical support, including MAX706RCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706RCSA requirements.
6.How does Aetrix verify that MAX706RCSA is sourced from the original manufacturer or authorized distributors?
All MAX706RCSA 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 MAX706RCSA meets industry standards.
7.What is the process for return or replacement of MAX706RCSA?
All MAX706RCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706RCSA, 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 MAX706RCSA part is unused and in its original packaging.
Return procedure for MAX706RCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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