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Analog Devices Inc./Maxim Integrated MAX705CPA
- Part No.:
- MAX705CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX705CPA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,074
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Product details
Overview
MAX705CPA from Maxim Integrated is a low-cost microprocessor supervisory circuit in 8-pin plastic DIP package, providing active-low reset output, 1.6s watchdog timer, 1.25V power-fail comparator input, and debounced manual-reset input. It asserts a guaranteed 200ms reset pulse when VCC drops below 4.65V or MR is pulled low, and supports critical μP power monitoring in industrial controllers and embedded instrumentation.
For engineers reviewing the MAX705CPA datasheet, MAX705CPA pinout, MAX705CPA application, or MAX705CPA equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in Maxim's official 19-4334 Rev. 11 specification.
Technical Context
The MAX705CPA integrates four core supervisory functions on a single die: a precision voltage monitor with 4.65V ±150mV threshold and 40mV hysteresis; a watchdog timer that triggers WDO low after 1.6s of no WDI edge; a 1.25V reference-based power-fail comparator (PFI/PFO); and a TTL/CMOS-compatible manual-reset input with internal 250μA pull-up and 150ns minimum pulse width handling.
Its reset generator guarantees valid RESET output down to VCC = 1V (0.4V max sink voltage at 3.2mA), and features fast response times: <250ns MR-to-RESET delay, <400ns PFI assertion/deassertion, and 2μs RESET assertion. All logic outputs are push-pull, with no open-drain configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion before +5V supply brownout affects μP operation |
| Reset Pulse Width | 200ms typ - meets Intel 80C51 and similar μP minimum reset hold-time requirements |
| Watchdog Timeout | 1.6s ±0.65s - provides sufficient margin for firmware watchdog service intervals without false timeout |
| PFI Threshold | 1.25V ±50mV - enables accurate power-fail warning or low-battery detection via external voltage divider |
| Supply Current | 350μA max at +70°C - enables long-term battery-backed operation in standby mode |
| VCC Operating Range | 1.0V to 5.5V - allows valid RESET assertion during deep brownout recovery down to 1V |
| MR Input Pull-Up | 250μA typ - eliminates need for external pull-up resistor when using pushbutton switch |
Pinout & Package
MAX705CPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54mm), compatible with standard PCB layouts and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Internally pulled up with 250μA; triggers 200ms RESET pulse when pulled below 0.8V; TTL/CMOS compatible |
| 2 VCC | +5V supply input | Power source for all internal circuits; RESET remains valid down to VCC = 1V |
| 3 GND | Ground reference | Common return path for all signals and internal comparators |
| 4 PFI | Power-fail input | Non-inverting input of 1.25V comparator; monitors external voltage via divider; draws ≤25nA |
| 5 PFO | Power-fail output | Active-low open-drain–like output (push-pull); sinks current when PFI < 1.25V; used for μP interrupt |
| 6 WDO | Watchdog output | Active-low push-pull output; goes low after 1.6s WDI inactivity; also asserts low during VCC brownout |
| 7 RESET | Active-low reset output | Guaranteed logic low (≤0.4V) during reset; 200ms pulse width; holds low until VCC > 4.65V + hysteresis |
| 8 WDI | Watchdog input | Edge-sensitive input; toggling required every <1.6s; floating or high-Z disables watchdog; accepts 50ns pulses |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Supervision | Combines reset generation, watchdog, power-fail warning, and manual reset in one 8-pin IC - reduces BOM count and board area vs discrete solutions |
| Guaranteed Reset Validity | RESET output functional down to VCC = 1V - ensures deterministic reset behavior during deep undervoltage recovery |
| Debounced Manual Reset | 140ms minimum reset pulse width inherently filters mechanical switch bounce - eliminates need for external RC debounce |
| Precision Voltage Monitoring | 4.65V reset threshold with ±150mV tolerance and 40mV hysteresis - prevents chatter during slow VCC ramp-up/down |
| Low-Power Operation | 350μA max supply current at +70°C - enables use in battery-powered systems with multi-year standby life |
Applications
| Industrial Controllers | Embedded Instrumentation |
|---|---|
Use Scenario: PLC mainboard with ARM Cortex-M7 MCU requiring fail-safe boot sequence and brownout recovery. IC Role / Device Role / Timing Role: MAX705CPA monitors +5V rail and asserts RESET if VCC falls below 4.65V; WDO connected to NMI for firmware hang detection. Use Value: Prevents corrupted register states and flash writes during unstable power; 200ms reset pulse satisfies μP tRST requirement. |
Use Scenario: Portable multimeter with lithium coin-cell backup and auto-shutdown on low battery. IC Role / Device Role / Timing Role: PFI monitors divided battery voltage; PFO triggers shutdown routine when cell drops below 2.7V. Use Value: 1.25V comparator threshold enables precise low-battery warning with <50mV error; nanoamp PFI bias current preserves battery life. |
| Critical μP Power Monitoring | Computers & Workstations |
Use Scenario: Medical diagnostic device with FPGA and dual-core processor requiring deterministic cold/warm reset. IC Role / Device Role / Timing Role: MR driven by front-panel reset button; RESET drives both processor and FPGA reset synchronously. Use Value: Debounced MR input eliminates spurious resets; 250μA internal pull-up removes external component. |
Use Scenario: Industrial PC motherboard where +5V rail must be validated before BIOS execution. IC Role / Device Role / Timing Role: MAX705CPA replaces discrete reset IC + watchdog + comparator combo on legacy design. Use Value: Reduces footprint by 60% vs discrete solution; same-pinout replacement avoids PCB rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CPA | 4.40V reset threshold (vs 4.65V); identical pinout, timing, and feature set | Suitable for systems with tighter +5V tolerance or lower-voltage regulators | Select MAX706CPA only if system brownout occurs near 4.4V - otherwise MAX705CPA's 4.65V threshold better matches standard +5V rails. |
| MAX813LCPA | Active-high RESET output only (no active-low RESET); same 4.65V threshold, 1.6s watchdog, and PFI/PFO | Required for μPs like Intel 80C51 that demand active-high reset polarity | Choose MAX813LCPA when μP reset input is active-high; MAX705CPA is mandatory for active-low reset architectures. |
Compared with MAX706CPA and MAX813LCPA, the MAX705CPA uniquely provides active-low RESET output at 4.65V threshold - making it the optimal choice for legacy 5V systems requiring standard negative-logic reset signaling and robust brownout immunity.
Availability
MAX705CPA is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, critical μP power monitoring, and computers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX705CPA 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 industrial, medical, and communications applications, with emphasis on reliability and integration.
The MAX705 family targets cost-sensitive microprocessor supervision, delivering reset, watchdog, power-fail, and manual-reset functions in compact packages for embedded control systems.
FAQ
What is the reset threshold voltage of the MAX705CPA?
The MAX705CPA has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature. This means RESET asserts when VCC falls below approximately 4.50V and releases after VCC rises above ~4.75V, providing 40mV hysteresis to prevent oscillation during slow supply ramps. The MAX705CPA datasheet (Rev. 11, p.2) confirms this value applies specifically to the MAX705/MAX707/MAX813L variants.
Does the MAX705CPA support active-high reset output?
No, the MAX705CPA provides only an active-low RESET output. It does not include the active-high RESET output found in the MAX707CPA or MAX813LCPA. If your microprocessor requires active-high reset signaling, you must select MAX707CPA or MAX813LCPA instead - the MAX705CPA's RESET pin is strictly active-low and non-inverting.
Can the MAX705CPA operate with supply voltages below 5V?
Yes, the MAX705CPA operates from VCC = 1.0V to 5.5V. Its RESET output remains valid down to 1V (guaranteed ≤0.4V at 3.2mA sink), and the internal comparators function correctly across this range. This enables use in brownout recovery, battery-backed systems, and low-voltage embedded designs - confirmed in the Electrical Characteristics table (p.2) of the MAX705CPA datasheet.
What is the watchdog timeout period for the MAX705CPA?
The MAX705CPA watchdog timeout period is 1.6 seconds typical, with a specified range of 1.00s to 2.25s over temperature and voltage. The timer resets on any rising or falling edge at WDI, and is also cleared when RESET is asserted or WDI is three-stated. This timing is explicitly defined for MAX705/MAX706/MAX813L in the Electrical Characteristics table (p.2).
How does the manual-reset input (MR) work on the MAX705CPA?
The MR pin on the MAX705CPA is an active-low input with an internal 250μA pull-up current. Pulling MR below 0.8V triggers a 200ms RESET pulse, and the input accepts TTL/CMOS logic levels. Its 150ns minimum pulse width and built-in debouncing eliminate external components - details confirmed in the Pin Description section (p.5) and Applications Information (p.6) of the MAX705CPA datasheet.
MAX705CPA 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:
- 4.65V
- 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
MAX705CPA FAQ
1.How can I place an order for MAX705CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705CPA 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 MAX705CPA reliable?
The price and inventory of MAX705CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705CPA is usually 5 days.
3.What payment methods are accepted for MAX705CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705CPA?
MAX705CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705CPA 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 MAX705CPA?
For technical support, including MAX705CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705CPA requirements.
6.How does Aetrix verify that MAX705CPA is sourced from the original manufacturer or authorized distributors?
All MAX705CPA 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 MAX705CPA meets industry standards.
7.What is the process for return or replacement of MAX705CPA?
All MAX705CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX705CPA, 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 MAX705CPA part is unused and in its original packaging.
Return procedure for MAX705CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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