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Analog Devices Inc./Maxim Integrated MAX705EPA+
- Part No.:
- MAX705EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX705EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:134
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Product details
Overview
MAX705EPA+ from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin PDIP package, providing active-low reset output (4.65V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in industrial controllers and embedded systems.
For engineers reviewing the MAX705EPA+ datasheet, MAX705EPA+ pinout, MAX705EPA+ application, or MAX705EPA+ equivalent, this page delivers verified functional identity, temperature-rated electrical specs (–40°C to +85°C), package mapping (8-pin plastic DIP), and real-world timing behavior for reset assertion, watchdog clearing, and power-fail warning response.
Technical Context
The MAX705EPA+ integrates four core supervisory functions on a single die: a precision voltage monitor with 40mV hysteresis triggering a guaranteed 200ms active-low reset pulse; a watchdog timer that detects WDI edge transitions and asserts WDO low after 1.6s of inactivity; a 1.25V reference-based comparator for PFI/PFO power-fail signaling; and a TTL/CMOS-compatible MR input with internal 250µA pull-up and 150ns minimum pulse width support.
Its architecture ensures RESET remains valid down to VCC = 1V (0.4V max sink voltage at 50µA), supports direct connection to µP NMI lines via WDO, and allows flexible configuration - including disabling watchdog by floating WDI or using WDO as low-line indicator during undervoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset during power-up/brownout when VCC drops below this level; hysteresis prevents chatter near threshold. |
| Reset Pulse Width | 200ms typical - guarantees sufficient duration to fully initialize microprocessors like Intel 80C51 or ARM Cortex-M series. |
| Watchdog Timeout | 1.6s ±0.65s - provides deterministic window for firmware to service watchdog; resets on any WDI edge or MR assertion. |
| Power-Fail Input Threshold | 1.25V ±50mV - enables early warning for +5V supply collapse or monitoring of auxiliary rails (e.g., +12V via divider). |
| Supply Current (Operating) | 150–350µA - ultra-low quiescent draw suitable for battery-backed systems and always-on monitoring circuits. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments where thermal cycling and extended ambient ranges are critical. |
| VCC Range for Valid RESET | 1.0V to 5.5V - ensures reset functionality remains active even during deep brownout conditions before full power loss. |
Pinout & Package
MAX705EPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3-inch width, RoHS-compliant lead-free finish (indicated by '+' suffix), and standard through-hole mounting. Pin spacing conforms to JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Debounced TTL/CMOS-compatible trigger; internal 250µA pull-up; asserts RESET when pulled below 0.8V. |
| 2 VCC | +5V supply input | Primary power rail; supports operation from 1.0V to 5.5V; RESET valid down to VCC = 1V. |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity. |
| 4 PFI | Power-fail input | Comparator non-inverting input referenced to 1.25V; used for early warning of supply collapse or battery depletion. |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; can interrupt µP or drive external logic; requires external pull-up. |
| 6 WDO | Watchdog open-drain output | Goes low after 1.6s WDI inactivity; also pulls low during VCC undervoltage; no minimum pulse width. |
| 7 RESET | Active-low reset output | Guaranteed logic-low (≤0.4V) for ≥200ms; asserted on power-up, brownout, or MR activation. |
| 8 WDI | Watchdog input | Edge-sensitive; toggling clears internal timer; floating or high-Z disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables fail-safe reset assertion during deep brownout, preventing undefined µP state before complete power loss. |
| 200ms reset pulse width | Meets or exceeds minimum reset hold time requirements for most 8-bit, 16-bit, and 32-bit microcontrollers. |
| Debounced MR input with 150ns min pulse | Eliminates need for external RC debounce network; compatible with mechanical pushbuttons and logic-level signals. |
| 1.25V precision PFI threshold | Allows accurate monitoring of non-5V rails (e.g., +3.3V, +12V) using simple resistor dividers without calibration. |
| Watchdog timeout independent of VCC | Timer continues functioning across full operating voltage range (1.0V–5.5V), ensuring reliability during marginal supply conditions. |
Applications
| Industrial PLC Control Panel | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controller backplanes with multiple voltage domains. IC Role / Device Role / Timing Role: Supervises +5V main rail, asserts RESET on brownout, and triggers orderly shutdown via PFO interrupt when auxiliary supplies degrade. Use Value: Prevents corrupted I/O states and firmware lockups during grid fluctuations or capacitor aging in field-deployed equipment. |
Use Scenario: Ensuring deterministic boot and runtime supervision in portable ultrasound or ECG units with Li-ion backup. IC Role / Device Role / Timing Role: Monitors main DC-DC output and battery voltage via PFI; generates reset pulse on power interruption and initiates safe data save via PFO. Use Value: Guarantees patient data integrity and system restart readiness under variable load and battery discharge profiles. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Cold-cranking resilience and ignition-cycle supervision in 12V automotive subsystems. IC Role / Device Role / Timing Role: Detects battery sag below 9V via PFI divider; asserts RESET during cranking dips; watchdog guards against firmware hangs post-start. Use Value: Maintains CAN communication stability and avoids spurious resets during engine start transient events. |
Use Scenario: Tamper-resistant power monitoring and metering IC supervision in utility-grade smart meters. IC Role / Device Role / Timing Role: Provides brownout reset for metrology SoC and triggers secure shutdown via PFO when AC line fails or battery backup depletes. Use Value: Preserves billing accuracy and cryptographic key state during mains outage or battery end-of-life conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706EPA+ | 4.40V reset threshold (vs. 4.65V); identical pinout, timing, and feature set otherwise. | Better suited for systems with tighter +5V tolerance or lower-noise LDO-regulated supplies. | Select MAX706EPA+ only if design requires earlier reset assertion during gradual VCC droop. |
| MAX813LEPA+ | Active-high RESET output (RESET) instead of active-low; same 4.65V threshold, watchdog, and PFI/PFO functions. | Required for µPs with active-high reset inputs (e.g., Intel 80C51, certain ARM variants) without external inversion. | Choose MAX813LEPA+ when interfacing directly to active-high reset pins to avoid added logic or level-shifting components. |
Compared with MAX705EPA+, MAX706EPA+ offers earlier reset activation but lacks compatibility with legacy 4.65V designs, while MAX813LEPA+ eliminates external inverters for active-high µPs but cannot coexist with active-low reset architectures without redesign.
Availability
MAX705EPA+ is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX705EPA+ 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 applications.
The MAX705–MAX708/MAX813L family was designed to replace discrete reset generators and watchdog circuits in cost-sensitive µP systems - delivering integrated supervision with guaranteed timing, low power, and wide temperature operation.
FAQ
What is the reset threshold voltage for MAX705EPA+?
The MAX705EPA+ has a nominal reset threshold of 4.65V, with a guaranteed range of 4.50V to 4.75V over its full operating temperature range (–40°C to +85°C). This threshold is factory-trimmed and includes 40mV hysteresis to prevent oscillation near the trip point. The reset output remains asserted until VCC rises above the threshold and holds for a minimum 200ms pulse width.
Does MAX705EPA+ support watchdog functionality?
Yes, MAX705EPA+ includes a fully functional watchdog timer with a nominal timeout period of 1.6 seconds. It monitors the WDI pin for edges; if no transition occurs within that window, WDO goes low. The timer clears on any WDI edge, MR assertion, or RESET activation. WDI can be left floating to disable the watchdog, making MAX705EPA+ adaptable to systems that require reset-only supervision.
Can MAX705EPA+ monitor voltages other than +5V?
Yes, MAX705EPA+ can monitor non-5V supplies using the PFI input. Its internal 1.25V reference allows precise detection of voltage drops via an external resistor divider. For example, connecting a 10kΩ/2.2kΩ divider to a +12V rail yields ~2.2V at PFI - falling below 1.25V when the rail drops below ~10.9V. This enables early-warning power-fail detection for auxiliary rails without additional comparators.
What is the minimum VCC required for valid RESET output in MAX705EPA+?
MAX705EPA+ guarantees valid RESET output down to VCC = 1.0V, with a maximum sink voltage of 0.3V at 50µA load. This ensures robust reset assertion during deep brownout conditions - critical for preserving µP state integrity in battery-backed or unregulated systems. Below 1.0V, RESET becomes high-impedance, so a pull-down resistor is recommended for fail-safe low-state maintenance.
Is MAX705EPA+ pin-compatible with other members of the MAX705–MAX708 family?
Yes, MAX705EPA+ shares identical 8-pin PDIP pinout with MAX706EPA+, MAX707EPA+, MAX708EPA+, and MAX813LEPA+. All variants use the same physical layout and terminal functions. However, functional differences exist: MAX705EPA+ and MAX706EPA+ provide active-low RESET and WDO; MAX707EPA+/MAX708EPA+ add active-high RESET; MAX813LEPA+ replaces WDO with active-high RESET. Electrical compatibility requires verifying reset threshold and output polarity per application.
MAX705EPA+ 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:
- 4.65V
- 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
MAX705EPA+ FAQ
1.How can I place an order for MAX705EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705EPA+ 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 MAX705EPA+ reliable?
The price and inventory of MAX705EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705EPA+ is usually 5 days.
3.What payment methods are accepted for MAX705EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705EPA+?
MAX705EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705EPA+ 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 MAX705EPA+?
For technical support, including MAX705EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705EPA+ requirements.
6.How does Aetrix verify that MAX705EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX705EPA+ 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 MAX705EPA+ meets industry standards.
7.What is the process for return or replacement of MAX705EPA+?
All MAX705EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX705EPA+, 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 MAX705EPA+ part is unused and in its original packaging.
Return procedure for MAX705EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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