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Analog Devices Inc./Maxim Integrated MAX706EPA
- Part No.:
- MAX706EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706EPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:17,628
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Product details
Overview
MAX706EPA from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin PDIP package, providing active-low reset output, 1.6s watchdog timer, 4.40V supply-voltage monitor threshold, 1.25V power-fail comparator input, and debounced manual-reset input. It ensures reliable power-up/power-down sequencing and brownout protection for +5V µP systems in industrial controllers and embedded instrumentation.
For engineers reviewing the MAX706EPA datasheet, MAX706EPA pinout, MAX706EPA application, or MAX706EPA equivalent, key selection criteria include its -40°C to +85°C operating range, guaranteed RESET validity down to VCC = 1V, 200ms reset pulse width, and compatibility with TTL/CMOS logic interfaces in space-constrained designs.
Technical Context
The MAX706EPA integrates four core supervisory functions on a single die: a precision voltage monitor with 4.40V ±25mV threshold and 40mV hysteresis, a 1.6s watchdog timer with 50ns minimum WDI pulse detection, a 1.25V reference-based power-fail comparator (PFI/PFO), and a TTL/CMOS-compatible manual-reset input with internal 250µA pull-up. All functions operate independently and are synchronized to VCC.
Its reset generator asserts RESET low for ≥140ms (typ. 200ms) after VCC rises above 4.40V or MR transitions high, and holds RESET low as long as VCC remains below threshold. The watchdog timeout is independent of VCC level but resets on any WDI edge, WDO connection to MR, or assertion of RESET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±25mV - triggers reset during brownout when +5V rail drops below safe µP operating level |
| Reset Pulse Width | 140–280ms (typ. 200ms) - ensures sufficient duration to fully initialize microprocessors like 80C51 |
| Watchdog Timeout | 1.00–2.25s (typ. 1.60s) - provides fail-safe recovery window for firmware hangs without requiring external timing components |
| Power-Fail Input Threshold | 1.20–1.30V (typ. 1.25V) - enables early warning of +5V regulator dropout via external resistor divider |
| Supply Current | 150–500µA (max at TMAX) - supports low-power operation in battery-backed or energy-sensitive systems |
| VCC Operating Range | 4.5V to 5.5V - matches standard +5V linear regulator outputs and tolerates line ripple |
| RESET Valid Down To | VCC = 1V - guarantees reset assertion integrity during deep undervoltage conditions before shutdown |
Pinout & Package
MAX706EPA is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and 0.100" lead pitch, RoHS-compliant with lead-free option available (suffix '+'). Pin 1 is marked with a notch or dot; pins are numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250µA pull-up enables switch or logic-line interface without external resistor |
| 2 VCC | +5V Supply Input | Primary power rail connection; powers all internal circuits and defines reset threshold reference |
| 3 GND | Ground Reference | 0V return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-Fail Input | High-impedance (±25nA) comparator input referenced to 1.25V; used for monitoring auxiliary supplies or battery voltage |
| 5 PFO | Power-Fail Output | Open-drain active-low output sinking up to 3.2mA; asserts when PFI < 1.25V to signal impending power loss |
| 6 WDI | Watchdog Input | Edge-triggered input; toggling within 1.6s prevents WDO assertion; floating or high-Z disables watchdog |
| 7 RESET | Active-Low Reset Output | Push-pull output guaranteed low ≤0.4V at 3.2mA sink; pulses low for 200ms on power-up/brownout/manual trigger |
| 8 WDO | Watchdog Output | Open-drain active-low output; goes low on timeout or VCC undervoltage; no minimum pulse width guarantee |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures deterministic reset assertion during deep brownout, preventing µP lockup before full power collapse |
| Debounced manual-reset input | 140ms minimum reset pulse eliminates need for external RC debounce circuitry in pushbutton applications |
| Independent power-fail comparator | Uncommitted PFI/PFO pins allow flexible early-warning implementation for +12V, negative rails, or battery monitoring |
| Watchdog timeout with edge-sensitive WDI | 50ns minimum detectable pulse width enables robust firmware heartbeat signaling without timing margin concerns |
| 40mV reset threshold hysteresis | Prevents oscillatory reset assertion during slow VCC ramp-up or noisy supply conditions near trip point |
Applications
| Industrial Controller Monitoring | Embedded Instrumentation Power Supervision |
|---|---|
Use Scenario: PLC I/O modules require deterministic reset during AC line sags and backup battery switchover. IC Role / Device Role / Timing Role: MAX706EPA monitors main +5V rail and generates clean 200ms reset pulse to ARM Cortex-M4 controller. Use Value: Prevents corrupted register writes during undervoltage by holding µP in reset until stable VCC > 4.40V. |
Use Scenario: Portable multimeter uses coin-cell backup; system must detect battery depletion before data loss. IC Role / Device Role / Timing Role: MAX706EPA PFI pin monitors divided battery voltage; PFO interrupts µP to save calibration data. Use Value: 1.25V comparator threshold enables accurate end-of-life detection at 2.4V battery (via 2:1 divider). |
| Communications Equipment Brownout Protection | Medical Diagnostic Device Power Sequencing |
Use Scenario: Ethernet switch experiences transient dips on +5V supply due to PoE negotiation bursts. IC Role / Device Role / Timing Role: MAX706EPA RESET output holds FPGA configuration logic in reset during sub-100ms brownouts. Use Value: 40mV hysteresis avoids chatter on reset line during marginal VCC recovery, ensuring single clean deassertion. |
Use Scenario: Ultrasound imaging system requires strict power-up order: ADCs before DSP, before display controller. IC Role / Device Role / Timing Role: MAX706EPA MR input triggered by sequencer IC to initiate synchronized reset across subsystems. Use Value: Debounced MR input eliminates false triggers from sequencer signal noise, guaranteeing precise timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CPA | Same functionality but rated for 0°C to +70°C only; lower temperature grade reduces cost for commercial environments | Limited to non-industrial ambient conditions; unsuitable for extended outdoor or factory-floor deployments | Select MAX706CPA only if operating environment stays within 0–70°C and cost sensitivity outweighs thermal margin needs |
| MAX706ESA | Identical electrical specs and temp range (-40°C to +85°C), but in 8-pin SO package (smaller footprint, surface-mount) | Requires PCB rework for SO vs. DIP; better suited for automated assembly and higher-density layouts | Choose MAX706ESA when board space is constrained or production uses SMT processes instead of through-hole |
Compared with MAX706CPA and MAX706ESA, the MAX706EPA offers through-hole manufacturability with industrial temperature support-ideal for prototyping, repair, and legacy systems where DIP sockets or hand-soldering are required.
Availability
MAX706EPA is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, communications equipment, and medical diagnostic devices requiring stable component supply across extended temperature ranges.
Supply support for MAX706EPA 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 precision analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The MAX705–MAX708 family delivers integrated µP supervisory functions-including reset, watchdog, power-fail detection, and manual reset-in compact packages to reduce system complexity and improve reliability in resource-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX706EPA?
The MAX706EPA has a nominal reset threshold of 4.40V with a tolerance of ±25mV, meaning it asserts the active-low RESET output whenever the VCC supply drops below 4.40V. This threshold is optimized for +5V systems experiencing brownout conditions and includes 40mV hysteresis to prevent oscillation near the trip point. The MAX706EPA's threshold is distinct from the 4.65V version used in MAX705/MAX707 parts.
Does the MAX706EPA provide both reset and watchdog functionality?
Yes, the MAX706EPA integrates both functions: an active-low RESET output that pulses low for 200ms during power-up, brownout, or manual reset; and a watchdog timer with a typical timeout period of 1.6 seconds. The watchdog monitors the WDI input and drives WDO low if no edge is detected within that window. Unlike MAX707/MAX708, the MAX706EPA does not provide an active-high RESET output.
Can the MAX706EPA monitor voltages other than the main +5V supply?
Yes, the MAX706EPA's PFI (Power-Fail Input) pin accepts any DC voltage referenced to GND and compares it to an internal 1.25V threshold. By connecting a resistor divider from a +12V rail or battery to PFI, designers can configure early-warning detection-for example, asserting PFO when battery voltage falls below 2.4V (using a 2:1 divider). The PFI input draws only ±25nA, minimizing loading effects.
What is the minimum VCC level at which MAX706EPA guarantees valid RESET output?
The MAX706EPA guarantees RESET output validity down to VCC = 1V, meaning it will assert a logic-low RESET signal ≤0.4V while sinking 3.2mA even as the supply collapses. This ensures deterministic behavior during deep brownout events before complete power loss. Below 1V, RESET becomes high-impedance, so a pull-down resistor is recommended for CMOS inputs.
Is the MAX706EPA pin-compatible with other parts in the MAX705–MAX708 family?
Yes, the MAX706EPA shares identical pinout and package (8-pin PDIP) with MAX705EPA, MAX707EPA, and MAX708EPA. However, functional differences exist: MAX705EPA includes watchdog + active-low RESET; MAX706EPA is identical but with 4.40V threshold; MAX707EPA adds active-high RESET; MAX708EPA combines active-high RESET with 4.40V threshold. Electrical pin behavior matches across all variants.
MAX706EPA 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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX706EPA FAQ
1.How can I place an order for MAX706EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706EPA 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 MAX706EPA reliable?
The price and inventory of MAX706EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706EPA is usually 5 days.
3.What payment methods are accepted for MAX706EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706EPA?
MAX706EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706EPA 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 MAX706EPA?
For technical support, including MAX706EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706EPA requirements.
6.How does Aetrix verify that MAX706EPA is sourced from the original manufacturer or authorized distributors?
All MAX706EPA 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 MAX706EPA meets industry standards.
7.What is the process for return or replacement of MAX706EPA?
All MAX706EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706EPA, 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 MAX706EPA part is unused and in its original packaging.
Return procedure for MAX706EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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