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Analog Devices Inc./Maxim Integrated MAX706PCPA
- Part No.:
- MAX706PCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706PCPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:4,177
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Product details
Overview
MAX706PCPA from Maxim Integrated is an active-high reset, +3V microprocessor supervisory circuit in 8-pin PDIP package, providing power-on reset, watchdog timer (1.6s timeout), 1.25V power-fail comparator input, and debounced manual-reset input. It guarantees RESET assertion down to VCC = 1V and consumes only 100µA quiescent current, enabling reliable power monitoring in battery-powered portable instruments.
For engineers reviewing the MAX706PCPA datasheet, MAX706PCPA pinout, MAX706PCPA application, or MAX706PCPA equivalent, this device serves as a precision voltage monitor for +3V/+3.3V µP systems requiring brownout protection, orderly shutdown signaling, and watchdog supervision without PCB redesign-especially where active-high reset logic and DIP packaging are mandatory.
Technical Context
The MAX706PCPA implements a dedicated reset generator with internal 200ms delay timer and a separate 1.6s watchdog timer that resets on WDI edge transitions. Its reset threshold is fixed at 2.63V (±20mV hysteresis), and it asserts active-high RESET when VCC falls below this level or MR is pulled low.
It integrates a 1.25V precision reference for the PFI comparator, enabling external resistive-divider-based power-fail or low-battery detection. The WDI input disables automatically when left open or connected to a high-impedance tri-state output (<600nA leakage), distinguishing it from non-A variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±20mV - ensures reliable reset assertion before +3.3V µP supply dropout |
| Reset Pulse Width | 200ms typical - provides sufficient time for µP initialization after power stabilization |
| Watchdog Timeout | 1.6s - detects µP lockup while allowing normal firmware servicing intervals |
| Quiescent Current | 100µA max - enables multi-year operation in coin-cell–powered portable equipment |
| Supply Voltage Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout (down to 1V) |
| PFI Reference Voltage | 1.25V ±5% - enables accurate external power-fail warning via resistor divider |
| MR Input Compatibility | TTL/CMOS - allows direct interface with pushbutton switches or logic outputs without level-shifting |
Pinout & Package
MAX706PCPA is housed in an 8-pin plastic DIP (PDIP) package (PKG CODE P8-1), through-hole mountable, lead-free compatible, and specified for 0°C to +70°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low TTL/CMOS-compatible input; internal 70µA pull-up; triggers 200ms active-high RESET pulse when pulled ≤0.6V |
| 2 | VCC | Main supply input (1.0V to 5.5V); powers all internal circuits including reset generator and watchdog |
| 3 | GND | Analog/digital ground reference for all internal comparators and outputs |
| 4 | PFI | Power-fail comparator inverting input; referenced to internal 1.25V; used with external resistor divider for custom trip points |
| 5 | PFO | Active-low open-drain output; asserts when PFI < 1.25V; sinks current to signal power-fail or low-battery condition |
| 6 | WDI | Watchdog input; edge-sensitive (rising/falling); must toggle within 1.6s to prevent WDO assertion; auto-disables when floating |
| 7 | RESET | Active-high push-pull reset output; remains high during VCC < 2.63V or MR low; deasserts 200ms after recovery |
| 8 | WDO | Active-low open-drain watchdog output; asserts on WDI timeout or VCC < 2.63V; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Active-High RESET Output | Eliminates need for external inverter in systems requiring high-true reset logic |
| Guaranteed RESET Assertion to VCC = 1V | Ensures deterministic µP reset behavior during severe brownout or battery depletion |
| WDI Auto-Disable on High-Z | Prevents false watchdog timeouts when µP is in sleep or tri-state mode |
| Debounced Manual Reset Input | 140ms minimum pulse width tolerance rejects mechanical switch bounce without external RC |
| 1.25V Precision PFI Reference | Enables accurate, temperature-stable power-fail detection across -40°C to +85°C range |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Brownout Resilience |
|---|---|
|
Use Scenario: Handheld multimeter powered by 3.3V Li-ion battery with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main supply rail, triggers active-high RESET on battery sag, and signals low-battery via PFO-driven LED. Use Value: Prevents corrupted measurements during voltage droop and enables graceful shutdown before data loss. |
Use Scenario: PLC I/O module operating in factory environments with unstable 3.3V backplane power. IC Role / Device Role / Timing Role: Monitors 3.3V rail with 2.63V threshold; asserts RESET on brownout and feeds WDO to NMI for diagnostic logging. Use Value: Maintains deterministic state recovery and captures fault context before system reset. |
| Embedded Computers with Watchdog Safety | Intelligent Sensors with Power-Fail Warning |
|
Use Scenario: Fanless embedded PC running Linux in remote telemetry node. IC Role / Device Role / Timing Role: Provides 200ms power-on reset and 1.6s watchdog supervision of host processor via WDI polling loop. Use Value: Guarantees boot integrity and recovers from software hangs without operator intervention. |
Use Scenario: Smart environmental sensor node using 3.3V regulator fed from solar-charged battery. IC Role / Device Role / Timing Role: Uses PFI/PFO to detect unregulated input collapse and trigger early-warning interrupt before regulated output fails. Use Value: Enables last-minute data save and transmission prior to full power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCPA | Reset threshold 2.93V (vs. 2.63V); otherwise identical pinout, features, and timing | Suitable for +3.3V systems with tighter supply tolerance; not drop-in for 2.63V-critical designs | Select MAX706SCPA only if system VCC nominal is ≥3.0V and brownout margin requires higher trip point. |
| MAX706APCPA | Same 2.63V threshold and PDIP package, but adds WDI auto-disable feature and active-high RESET | Functionally identical to MAX706PCPA; MAX706APCPA is superseding variant with enhanced WDI behavior | MAX706APCPA is preferred for new designs requiring guaranteed WDI disable during µP sleep states. |
Compared with MAX706PCPA, MAX706SCPA raises reset threshold by 300mV-critical for avoiding nuisance resets in noisy +3.3V rails-while MAX706APCPA retains identical threshold and adds robust WDI handling for low-power firmware modes, making it the forward-compatible upgrade path.
Availability
MAX706PCPA is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controllers, embedded computers, and intelligent sensors requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX706PCPA 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 analog, mixed-signal, and power-management ICs for industrial, computing, and communications applications.
The MAX706 family was designed specifically for cost-sensitive, space-constrained +3V 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 MAX706PCPA?
The MAX706PCPA has a fixed reset threshold of 2.63V ±20mV (typical hysteresis). This value is guaranteed over the full 0°C to +70°C operating temperature range and ensures reliable reset assertion before most +3.3V microprocessors lose functional stability. The threshold is factory-trimmed and does not require external calibration.
Does the MAX706PCPA provide both active-high and active-low reset outputs?
No, the MAX706PCPA provides only an active-high RESET output (pin 7). It does not include the complementary active-low RESET output found in MAX708-series devices. For dual-output capability, consider MAX708RCPA instead-but note it lacks the watchdog timer present in MAX706PCPA.
Can the watchdog timer in the MAX706PCPA be disabled?
No, the watchdog timer in the MAX706PCPA cannot be disabled-it remains fully active whenever VCC is within specification. Unlike the MAX706AP series, the MAX706PCPA's WDI input has no auto-disable function; leaving WDI floating will cause continuous WDO assertion. External control via µP GPIO is required for intentional disable.
What is the minimum VCC level at which MAX706PCPA guarantees RESET assertion?
The MAX706PCPA guarantees active-high RESET assertion down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior even during deep brownout conditions common in battery-depleted portable systems.
Is the MAX706PCPA pin-compatible with other MAX706 variants in PDIP package?
Yes, all MAX706x CPA variants-including MAX706PCPA, MAX706RCPA, MAX706SCPA, and MAX706TCPA-share identical 8-pin PDIP pinout and footprint. Differences are limited to reset threshold voltage (2.63V/2.93V/3.08V) and RESET polarity (active-high for P/AP, active-low for R/S/T/AR/AS/AT), with no changes to pin function mapping.
MAX706PCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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 High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX706PCPA FAQ
1.How can I place an order for MAX706PCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706PCPA 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 MAX706PCPA reliable?
The price and inventory of MAX706PCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706PCPA is usually 5 days.
3.What payment methods are accepted for MAX706PCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706PCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706PCPA?
MAX706PCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706PCPA 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 MAX706PCPA?
For technical support, including MAX706PCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706PCPA requirements.
6.How does Aetrix verify that MAX706PCPA is sourced from the original manufacturer or authorized distributors?
All MAX706PCPA 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 MAX706PCPA meets industry standards.
7.What is the process for return or replacement of MAX706PCPA?
All MAX706PCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706PCPA, 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 MAX706PCPA part is unused and in its original packaging.
Return procedure for MAX706PCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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