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Analog Devices Inc./Maxim Integrated MAX706CPA
- Part No.:
- MAX706CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706CPA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,737
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Product details
Overview
The MAX706CPA from Maxim Integrated is a microprocessor supervisory circuit in an 8-pin plastic DIP package, providing active-low reset output, 1.6s watchdog timeout, 4.40V supply-voltage monitoring threshold, 1.25V power-fail comparator input, and debounced manual-reset input - all operating down to VCC = 1V. It ensures reliable power-up initialization and brownout protection for embedded controllers and industrial μP systems.
For engineers reviewing the MAX706CPA datasheet, MAX706CPA pinout, MAX706CPA application, or MAX706CPA equivalent, this device serves as a cost-optimized, single-chip solution for critical +5V system supervision with integrated watchdog, power-fail warning, and pushbutton reset - requiring no external components for core functionality.
Technical Context
The MAX706CPA implements a precision bandgap-based voltage monitor with 4.40V ±150mV reset threshold and 40mV hysteresis, ensuring stable reset assertion during supply transients. Its internal watchdog timer triggers WDO low after 1.6s (±0.65s) of inactivity on WDI, with 50ns minimum pulse detection capability.
Reset assertion is guaranteed valid at VCC ≥ 1V, with a fixed 200ms (min 140ms) reset pulse width and TTL/CMOS-compatible MR input featuring 250μA internal pull-up. The PFI comparator operates independently with 1.25V reference and <25nA input bias current, enabling accurate low-battery or secondary supply monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - guarantees reset assertion before +5V rail collapse compromises μP operation |
| Watchdog Timeout | 1.6s ±0.65s - provides sufficient margin for firmware execution loops while detecting lockups |
| Reset Pulse Width | 200ms typical - exceeds minimum μP reset hold time requirements for reliable boot initialization |
| Supply Voltage Range | 1.0V to 5.5V - enables valid reset signaling even during deep brownout or battery-depleted conditions |
| PFI Threshold | 1.25V ±50mV - supports precise power-fail warning or low-battery detection via external resistor divider |
| MR Input Pull-Up | 250μA - eliminates need for external pull-up and ensures clean TTL/CMOS-compatible reset triggering |
| Quiescent Current | 150–350μA - minimizes standby power impact in battery-backed or energy-sensitive applications |
Pinout & Package
MAX706CPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pins are numbered counter-clockwise from top-left when viewed from component side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-reset input | Active-low TTL/CMOS-compatible trigger with 250μA internal pull-up; debounced by 140ms min reset pulse |
| 2 VCC | +5V supply input | Primary power rail connection; reset remains valid down to 1.0V for brownout resilience |
| 3 GND | Ground reference | Common return path for all analog and digital functions; required for accurate voltage monitoring |
| 4 PFI | Power-fail input | Comparator inverting input referenced to 1.25V; monitors auxiliary supplies or battery voltage via divider |
| 5 PFO | Power-fail output | Open-drain active-low output asserting when PFI < 1.25V; sinks up to 3.2mA for interrupt generation |
| 6 WDI | Watchdog input | Edge-sensitive input clearing internal 1.6s timer on rising/falling transitions; floating disables watchdog |
| 7 RESET | Active-low reset output | Push-pull output asserting low for ≥140ms during power-up/brownout; sinks 3.2mA at 0.4V max |
| 8 WDO | Watchdog output | Open-drain active-low output asserting on timeout or VCC drop below 4.40V; no minimum pulse width |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables fail-safe reset assertion during severe brownout, preventing μP corruption before supply collapse |
| Integrated 1.25V precision reference for PFI | Allows accurate, temperature-stable monitoring of non-+5V rails (e.g., +3.3V, +12V, or battery) without external references |
| Debounced MR input with internal 250μA pull-up | Eliminates external RC network and switch bounce issues; compatible with direct pushbutton or logic-level drive |
| Independent watchdog and reset paths | Permits use of WDO as low-line indicator without affecting RESET timing, or connection to MR for forced reset |
| 40mV reset threshold hysteresis | Prevents oscillatory reset behavior during slow-rising/falling VCC transitions near 4.40V threshold |
Applications
| Industrial PLC Controllers | Embedded Data Loggers |
|---|---|
Use Scenario: Continuous operation in factory-floor environments with fluctuating 24VDC-derived +5V supplies. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during line sags and generating PFO interrupts for early power-fail logging. Use Value: Prevents corrupted firmware execution and enables graceful shutdown before backup capacitor depletion. |
Use Scenario: Battery-powered remote sensor nodes recording environmental data over weeks. IC Role / Device Role / Timing Role: Monitoring main Li-ion cell voltage via PFI divider and triggering controlled sleep mode via PFO interrupt. Use Value: Extends operational lifetime by initiating low-power state before brownout-induced data loss. |
| Medical Diagnostic Equipment | Point-of-Sale Terminals |
Use Scenario: Portable ultrasound units requiring deterministic boot sequence after AC/DC adapter reconnection. IC Role / Device Role / Timing Role: Providing 200ms RESET pulse synchronized to VCC ramp, plus WDI supervision of real-time image processing firmware. Use Value: Ensures clinical-grade reliability by eliminating boot failures due to marginal power sequencing. |
Use Scenario: Retail terminals exposed to frequent power cycling and ESD events near cash drawers. IC Role / Device Role / Timing Role: Detecting momentary dips in +5V rail using 4.40V threshold and asserting RESET to prevent transaction corruption. Use Value: Maintains PCI-DSS compliance by guaranteeing atomic transaction rollback on power anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CPA | 4.65V reset threshold (vs. 4.40V); otherwise identical pinout, timing, and feature set | Suitable for systems where higher reset threshold prevents nuisance resets on noisy +5V rails | Select MAX705CPA when tighter VCC regulation or higher noise immunity is required |
| MAX706CSA | Same electrical specs but 8-pin SO package (surface-mount); same 4.40V threshold and 1.6s watchdog | Required for PCB space-constrained designs or automated SMT assembly lines | Choose MAX706CSA when board area or manufacturing process mandates SO packaging |
Compared with MAX705CPA and MAX706CSA, the MAX706CPA offers the optimal balance of through-hole manufacturability, 4.40V reset sensitivity for margin-critical +5V systems, and full functional compatibility - making it ideal for industrial control and legacy design refreshes.
Availability
MAX706CPA is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded data loggers, medical diagnostic equipment, and point-of-sale terminals requiring stable component supply across extended production lifecycles.
Supply support for MAX706CPA 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 MAX705–MAX708 family was designed specifically for cost-sensitive microprocessor supervision, integrating reset, watchdog, power-fail detection, and manual reset into a single 8-pin package for embedded systems with strict board-area constraints.
FAQ
What is the reset threshold voltage of the MAX706CPA?
The MAX706CPA has a nominal reset threshold of 4.40V with ±150mV tolerance, meaning RESET asserts when VCC drops below approximately 4.25V and releases after VCC rises above ~4.55V. This threshold is optimized for standard +5V systems with moderate regulation margins, distinguishing it from the 4.65V variant (MAX705CPA).
Does the MAX706CPA require external components to function?
No, the MAX706CPA operates autonomously with no external components required for core supervision: its 250μA MR pull-up eliminates external resistors, the 1.25V PFI reference is internal, and the 1.6s watchdog timer needs only a firmware toggle on WDI. Only optional features - like PFI voltage dividers or RESET pull-downs for sub-1V operation - require external parts.
Can the MAX706CPA monitor voltages other than +5V?
Yes, the MAX706CPA's PFI input accepts any DC voltage referenced to GND. By connecting a resistor divider from a target supply (e.g., +12V or +3.3V) to PFI, the device triggers PFO when the divided voltage falls below 1.25V - enabling flexible power-fail or low-battery detection across multiple rails without additional ICs.
How does the watchdog timer in the MAX706CPA interact with the reset output?
The MAX706CPA's watchdog timer does not directly assert RESET; WDO goes low on timeout, but RESET remains unaffected unless WDO is externally connected to MR. This decoupling allows independent use - e.g., WDO as a low-line indicator while RESET handles power sequencing - or intentional coupling for forced reset recovery.
Is the MAX706CPA pin-compatible with other devices in the MAX705–MAX708 family?
Yes, all MAX705–MAX708 variants share identical 8-pin DIP/SO/μMAX pinouts and terminal functions. The MAX706CPA is fully pin-compatible with MAX705CPA, MAX707CPA, and MAX708CPA - differing only in reset threshold (4.40V vs. 4.65V) and output configuration (RESET-only vs. RESET/RESET), allowing drop-in substitution where those parameters align.
MAX706CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX706CPA FAQ
1.How can I place an order for MAX706CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706CPA 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 MAX706CPA reliable?
The price and inventory of MAX706CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706CPA is usually 5 days.
3.What payment methods are accepted for MAX706CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706CPA?
MAX706CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706CPA 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 MAX706CPA?
For technical support, including MAX706CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706CPA requirements.
6.How does Aetrix verify that MAX706CPA is sourced from the original manufacturer or authorized distributors?
All MAX706CPA 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 MAX706CPA meets industry standards.
7.What is the process for return or replacement of MAX706CPA?
All MAX706CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706CPA, 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 MAX706CPA part is unused and in its original packaging.
Return procedure for MAX706CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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