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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 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
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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 reset generation during power-up/down/brownout (2.63V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input (PFI), and debounced manual-reset input (MR). It operates over 0°C to +70°C in 8-pin SO package and is used in battery-powered portable instruments and critical µP power monitoring.
For engineers reviewing the MAX706RCSA+ datasheet, MAX706RCSA+ pinout, MAX706RCSA+ application, or MAX706RCSA+ equivalent, key selection considerations include its 2.63V reset threshold, guaranteed RESET assertion down to VCC = 1V, 200ms reset pulse width, and compatibility with TTL/CMOS logic levels across 2.7V–5.5V supply range.
Technical Context
The MAX706RCSA+ integrates a precision voltage monitor with 20mV hysteresis, a monostable reset generator with fixed 200ms delay, and a transition-detecting watchdog timer that resets on any WDI edge within 1.6s. Its PFI comparator uses an internal 1.25V reference to support external resistive-divider monitoring of auxiliary supplies.
Reset assertion is guaranteed for VCC ≥ 1V; the active-low RESET output remains low until VCC exceeds 2.63V and holds for 200ms thereafter. The WDO output asserts low on watchdog timeout or VCC brownout but deasserts immediately upon VCC recovery - unlike RESET, which maintains timing delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset initiation before µP supply instability at +3V operation |
| Reset Pulse Width | 200ms typical; guarantees sufficient hold time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; provides deterministic software liveliness check without requiring clock source |
| Supply Current | 100µA max at VCC = 3.0V; enables long battery life in portable equipment |
| PFI Threshold | 1.25V ±0.05V; supports accurate power-fail warning or low-battery detection via external divider |
| Operating Voltage Range | 2.7V to 5.5V; allows dual-supply compatibility with +3.3V and +5V µP systems |
| Temperature Range | 0°C to +70°C; qualified for commercial-grade embedded instrumentation and computing applications |
Pinout & Package
MAX706RCSA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compatible, with 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced TTL/CMOS-compatible input; internally pulled up with ~70µA; triggers 200ms RESET pulse when pulled below 0.6V |
| 2 VCC | Positive supply input | Accepts 2.7V–5.5V; RESET asserted for VCC ≥ 1V; supply current ≤100µA at 3.0V |
| 3 GND | Ground reference | Common return for all internal circuits and outputs; requires low-impedance connection |
| 4 PFI | Power-fail comparator input | High-impedance input referenced to 1.25V; monitors auxiliary supply via external resistor divider |
| 5 PFO | Active-low power-fail output | Sinks current when PFI < 1.25V; used for early-warning interrupt or cascaded reset initiation |
| 6 WDI | Watchdog input | Edge-sensitive; toggling required every 1.6s; open-circuit disables watchdog only in AP/AR/AS/AT variants (not applicable to MAX706RCSA+) |
| 7 RESET | Active-low reset output | Guaranteed low for VCC ≥ 1V; remains low 200ms after VCC > 2.63V or MR release |
| 8 WDO | Active-low watchdog output | Asserts low on 1.6s WDI timeout or VCC brownout; deasserts immediately when VCC recovers above threshold |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures robust reset behavior during deep brownout, preventing µP execution from invalid supply |
| 200ms reset time delay | Provides consistent, temperature-stable initialization window independent of external RC components |
| 1.25V precision PFI reference | Enables accurate, repeatable power-fail or low-battery detection without external voltage reference IC |
| 100µA quiescent current at 3.0V | Extends battery runtime in portable instruments and handheld controllers |
| WDI edge-triggered watchdog | Eliminates need for dedicated clock source; tolerant of µP software jitter or variable task timing |
Applications
| Battery-Powered Portable Instruments | Critical Microprocessor Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter powered by single 3.3V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery sag or adapter disconnect, while PFI monitors unregulated DC input for early power-fail warning. Use Value: Prevents corrupted measurements or EEPROM writes during supply transitions; enables graceful shutdown via PFO-triggered µP interrupt. |
Use Scenario: Industrial PLC controller requiring fail-safe boot sequence under fluctuating 3.3V rail. IC Role / Device Role / Timing Role: Primary reset generator with 2.63V threshold aligned to µP VDD min spec, plus watchdog supervision of firmware execution loop. Use Value: Guarantees µP remains held in reset until stable 3.3V is confirmed; detects lockup via 1.6s WDI timeout and forces recovery. |
| Computers & Embedded Controllers | Intelligent Test & Measurement Equipment |
Use Scenario: Compact x86-based SBC operating from 3.3V or 5V SMPS with shared reset tree. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete reset + watchdog + PFI circuit; RESET drives system-wide reset net. Use Value: Reduces BOM count and PCB area; eliminates timing mismatches between discrete reset and watchdog paths. |
Use Scenario: Automated calibration system using µP to control DACs, ADCs, and relays under varying line conditions. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and auxiliary 12V analog rail via PFI divider; generates synchronized reset and fault interrupts. Use Value: Ensures measurement integrity by halting acquisition during supply anomalies; logs fault events via PFO-triggered µP ISR. |
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 | Used where higher reset threshold aligns with µP VDD tolerance or tighter supply regulation | Select MAX706SCSA+ when system requires earlier reset assertion due to higher supply sensitivity |
| MAX706TCSA+ | 3.08V reset threshold (vs. 2.63V); same SO-8 package and functional interface | Preferred in +3.3V-only systems with minimal headroom, ensuring reset before µP operational limit | Choose MAX706TCSA+ for strict 3.3V rail monitoring where 2.63V threshold risks late reset assertion |
Compared with MAX706RCSA+, MAX706SCSA+ and MAX706TCSA+ offer higher reset thresholds (2.93V and 3.08V) for tighter supply-margin applications, while retaining identical watchdog, PFI, MR, and timing behavior - enabling direct substitution where threshold alignment matches system requirements.
Availability
MAX706RCSA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and critical µP power monitoring requiring stable component supply across commercial temperature range.
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) designs high-performance analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX706 family delivers cost-effective, integrated µP supervision for +3V systems - emphasizing precision voltage monitoring, deterministic reset timing, and watchdog reliability in space-constrained embedded designs.
FAQ
What is the reset threshold voltage for MAX706RCSA+?
The MAX706RCSA+ has a factory-trimmed reset threshold of 2.63V (VCC falling), with ±70mV tolerance over temperature and supply. This value is specified in the Electrical Characteristics table and applies across the full 0°C to +70°C operating range. The device guarantees RESET assertion for VCC ≥ 1V and deassertion after VCC exceeds 2.63V plus hysteresis.
Does MAX706RCSA+ include a watchdog timer function?
Yes, MAX706RCSA+ includes a watchdog timer with a nominal 1.6s timeout period. It monitors the WDI pin for edges and asserts WDO low if no transition occurs within that window. Unlike AP/AR/AS/AT variants, the watchdog in MAX706RCSA+ cannot be disabled - it remains active whenever VCC is valid.
What is the purpose of the PFI and PFO pins on MAX706RCSA+?
PFI is the power-fail comparator input, referenced to an internal 1.25V threshold; connecting it to a resistive divider enables monitoring of auxiliary supplies (e.g., unregulated DC or negative rails). PFO is the active-low output that asserts when PFI falls below 1.25V, allowing early-warning interrupts or cascaded reset initiation in the MAX706RCSA+.
Can MAX706RCSA+ operate from a 3.3V supply?
Yes, MAX706RCSA+ is fully specified for operation from 2.7V to 5.5V, including standard 3.3V systems. At VCC = 3.3V, it delivers 200ms reset pulse width, 100µA supply current, and TTL/CMOS-compatible logic levels on MR, RESET, WDO, and PFO - all verified per the Electrical Characteristics table.
Is MAX706RCSA+ pin-compatible with other MAX706 variants?
Yes, MAX706RCSA+ shares identical 8-pin SO (S8-2) pinout with all MAX706P/R/S/T and MAX706AP/AR/AS/AT variants in SO package. Pin functions - MR, VCC, GND, PFI, PFO, WDI, RESET, WDO - are fixed across the family, enabling drop-in replacement when reset threshold and watchdog enable requirements match.
MAX706RCSA+ 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:
- 2.63V
- 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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