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Analog Devices Inc./Maxim Integrated MAX706TCPA+
- Part No.:
- MAX706TCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706TCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
MAX706TCPA+ from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation during power-up/down/brownout (3.08V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input. It operates over 0°C to +70°C in 8-pin PDIP package and is used in battery-powered instruments and embedded controllers requiring reliable power monitoring.
For engineers reviewing the MAX706TCPA+ datasheet, MAX706TCPA+ pinout, MAX706TCPA+ application, or MAX706TCPA+ equivalent, this page delivers verified functional identity, exact reset threshold (3.08V), guaranteed RESET assertion down to VCC = 1V, watchdog disable behavior (not supported on MAX706T series), and confirmed 200ms reset pulse width - all critical for industrial and portable system design validation.
Technical Context
The MAX706TCPA+ implements a precision voltage-monitoring architecture with a fixed 3.08V reset threshold (±1.5% typical) and 20mV hysteresis, ensuring stable reset assertion during supply transients. Its internal timer guarantees a 200ms reset pulse width after VCC exceeds threshold or MR release.
It integrates four independent functions: (1) power-on reset generator with VCC monitoring, (2) watchdog timer with 1.6s timeout and WDI edge detection, (3) 1.25V reference-based PFI comparator for power-fail/low-battery warning, and (4) TTL/CMOS-compatible manual-reset input with 500ns minimum pulse width at VCC = 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reset asserts before 3.3V µP brownout |
| Reset Pulse Width | 200ms nominal; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±40%; detects µP lockup without requiring external timing components |
| Supply Current | 100µA max at VCC = 3.3V; enables long battery life in portable applications |
| PFI Threshold | 1.25V ±20mV; supports configurable power-fail detection via external resistor divider |
| Operating Temp Range | 0°C to +70°C; validated for commercial-grade embedded instrumentation |
| VCC Valid Reset Range | Guaranteed RESET assertion down to VCC = 1V; ensures fail-safe behavior during deep undervoltage |
Pinout & Package
MAX706TCPA+ is housed in an 8-pin plastic DIP (PDIP) package (package code P8-1), lead-free compliant, with 0.3" wide body and standard through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Debounced TTL/CMOS-compatible trigger; pulls internal 70µA current source when asserted |
| 2 VCC | Positive supply input | Accepts 1.2V to 5.5V; powers all internal comparators, timer, and outputs |
| 3 GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO when input falls below 1.25V |
| 5 PFO | Active-low power-fail output | Open-drain output sinking up to 3.2mA; used for early-warning interrupt or MR triggering |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; no disable capability on T-suffix |
| 7 RESET | Active-low reset output | Push-pull output; drives µP reset pin directly; remains asserted for 200ms after recovery |
| 8 WDO | Active-low watchdog output | Open-drain output; signals µP lockup or VCC brownout; requires external pullup |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.08V reset threshold | Matches 3.3V µP supply tolerance; eliminates need for external resistor network |
| 200ms reset time delay | Guaranteed minimum pulse width ensures full µP core and peripheral initialization |
| 1.25V precision PFI reference | Enables accurate low-battery detection or auxiliary supply monitoring with <1% drift |
| 1.6s watchdog timeout | Configurable via WDI toggling; provides deterministic failure detection without external RC |
| MR input with 500ns pulse width support | Compatible with fast logic families and microcontroller GPIO; no external debounce required |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by dual AA cells with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and triggers reset if battery drops below 3.08V; PFI senses unregulated battery voltage for low-battery warning. Use Value: Prevents corrupted EEPROM writes and firmware crashes during battery depletion; extends usable runtime via early warning. |
Use Scenario: PLC I/O module operating from 3.3V LDO with isolated CAN interface. IC Role / Device Role / Timing Role: Generates power-on reset and detects brownout on 3.3V supply; WDO monitors main µP activity; PFO feeds MR to force reset on auxiliary supply fault. Use Value: Ensures deterministic boot sequence and recovers from µP lockups without operator intervention. |
| Embedded Computing Systems | Critical µP Power Monitoring |
Use Scenario: Compact fanless industrial PC using 3.3V SoC and 5V peripherals. IC Role / Device Role / Timing Role: Provides synchronized reset to SoC and FPGA; WDO guards against firmware hangs; PFI monitors 5V rail for peripheral power integrity. Use Value: Eliminates need for discrete reset generators and separate watchdog ICs; reduces BOM count by 3 components. |
Use Scenario: Medical sensor node with strict uptime requirements and battery backup. IC Role / Device Role / Timing Role: Guarantees RESET assertion down to VCC = 1V; monitors primary and backup supplies via PFI; supports manual reset via front-panel switch. Use Value: Meets IEC 62304 safety requirement for fail-safe power sequencing and deterministic recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TEPA+ | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range | Required for extended-temperature deployments (e.g., outdoor gateways, automotive under-hood) | Select MAX706TEPA+ when ambient operating temperature exceeds +70°C |
| MAX708TCPA+ | Provides both active-high and active-low RESET outputs; lacks watchdog timer; same 3.08V threshold and PFI/PFO | Suitable where dual-reset polarity is needed (e.g., legacy µP with active-high reset and CPLD with active-low reset) | Choose MAX708TCPA+ only if watchdog function is unnecessary and dual-reset signaling is mandatory |
Compared with MAX706TCPA+, MAX706TEPA+ offers broader thermal qualification without functional change, while MAX708TCPA+ trades watchdog capability for dual-reset polarity - making MAX706TCPA+ optimal for cost-sensitive, commercial-temperature applications requiring full supervision with watchdog protection.
Availability
MAX706TCPA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial microcontroller controllers requiring stable component supply across commercial temperature grades.
Supply support for MAX706TCPA+ 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 connectivity applications.
The MAX706 family targets cost-sensitive microprocessor supervision in portable and embedded systems, delivering integrated reset, watchdog, and power-fail monitoring in compact packages.
FAQ
What is the reset threshold voltage of the MAX706TCPA+?
The MAX706TCPA+ has a fixed reset threshold of 3.08V (VCC falling), with ±1.5% typical accuracy and 20mV hysteresis. This value is factory-trimmed and guaranteed over temperature. The 'T' suffix explicitly denotes the 3.08V variant, distinguishing it from R (2.63V) and S (2.93V) versions. This threshold ensures compatibility with standard 3.3V microprocessors and avoids false resets during normal supply ripple.
Does the MAX706TCPA+ support watchdog timer disable?
No, the MAX706TCPA+ does not support watchdog timer disable. Unlike the AP/AR/AS/AT variants, the MAX706TCPA+ (and all non-A-suffix parts) has a permanently enabled watchdog function - WDI must be toggled within 1.6s to prevent WDO assertion. Leaving WDI floating or unconnected will cause immediate WDO timeout. This is a hardwired behavioral difference confirmed in the datasheet's "Watchdog Timer" section.
What is the guaranteed minimum reset pulse width for MAX706TCPA+?
The MAX706TCPA+ guarantees a minimum reset pulse width of 200ms after VCC rises above the 3.08V threshold or after release of the MR input. This value is specified in the Electrical Characteristics table under "Reset Pulse Width (tRST)" and is valid across the full operating temperature range (0°C to +70°C). The 200ms duration ensures reliable initialization of modern microprocessors and their peripheral subsystems.
Can MAX706TCPA+ monitor a negative supply voltage?
Yes, the MAX706TCPA+ can monitor a negative supply using its PFI input in conjunction with an external resistor network, as shown in Figure 8 of the datasheet. The PFI comparator's inverting input is tied to an internal 1.25V reference, so connecting a negative rail through resistive division allows trip-point configuration. Accuracy depends on resistor tolerance and PFI input current (±25nA max), but the circuit is validated for use with –3V, –5V, or –12V rails in industrial sensor applications.
What package type and lead finish does MAX706TCPA+ use?
The MAX706TCPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3" body width (package code P8-1) and lead-free (RoHS-compliant) finish. It is a through-hole component with standard 0.1" pin spacing, compatible with wave soldering and manual prototyping. The '+' suffix in the part number explicitly indicates lead-free packaging per Maxim's ordering conventions.
MAX706TCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX706TCPA+ FAQ
1.How can I place an order for MAX706TCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706TCPA+ 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 MAX706TCPA+ reliable?
The price and inventory of MAX706TCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706TCPA+ is usually 5 days.
3.What payment methods are accepted for MAX706TCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706TCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706TCPA+?
MAX706TCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706TCPA+ 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 MAX706TCPA+?
For technical support, including MAX706TCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706TCPA+ requirements.
6.How does Aetrix verify that MAX706TCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX706TCPA+ 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 MAX706TCPA+ meets industry standards.
7.What is the process for return or replacement of MAX706TCPA+?
All MAX706TCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706TCPA+, 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 MAX706TCPA+ part is unused and in its original packaging.
Return procedure for MAX706TCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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