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Analog Devices Inc./Maxim Integrated MAX705CUA+
- Part No.:
- MAX705CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX705CUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,203
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Product details
Overview
The MAX705CUA+ from Maxim Integrated is a low-cost microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low reset output, 1.6s watchdog timeout, 4.65V supply-voltage monitoring, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in embedded control systems.
For engineers reviewing the MAX705CUA+ datasheet, MAX705CUA+ pinout, MAX705CUA+ application, or MAX705CUA+ equivalent, this page delivers verified functional identity, validated µMAX package mapping, confirmed 4.65V reset threshold and 200ms pulse width, and two field-validated alternative parts with documented technical differences.
Technical Context
The MAX705CUA+ integrates four core supervisory functions on a single die: a precision voltage monitor with 40mV hysteresis triggering a guaranteed 200ms active-low RESET pulse at VCC < 4.65V; a watchdog timer that asserts WDO low if WDI remains static beyond 1.6s; a 1.25V reference-based power-fail comparator driving PFO; and a TTL/CMOS-compatible MR input with internal 250µA pull-up and 150ns minimum pulse width support.
Its architecture guarantees RESET validity down to VCC = 1V (output low ≤ 0.4V at ISINK = 50µA), supports manual reset triggering of watchdog-initiated resets via WDO-to-MR connection, and features independent timing paths for power-on reset, brownout detection, and watchdog timeout - all operating without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers guaranteed 200ms active-low RESET pulse during power-up/brownout |
| Watchdog Timeout | 1.6s ±0.65s - WDO goes low if WDI lacks edge transition; clears on RESET assertion or WDI tristate |
| Power-Fail Threshold | 1.25V ±50mV - PFO pulls low when PFI falls below threshold, enabling early warning for +5V or other rails |
| Supply Voltage Range | 1.0V to 5.5V - RESET remains valid and functional down to 1V, supporting ultra-low-VCC sequencing |
| Reset Pulse Width | 200ms typical - ensures full μP initialization; minimum 140ms guarantees sufficient hold time after VCC rise |
| Manual-Reset Input | Active-low, 0.8V max logic-low threshold, 250µA internal pull-up - compatible with pushbutton switches and CMOS/TTL drivers |
| Quiescent Current | 150–350µA - enables long-term battery-backed operation without significant drain |
Pinout & Package
MAX705CUA+ is housed in an 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm × 0.8mm, RoHS-compliant with lead-free terminations (indicated by '+' suffix), and thermally rated for 330mW continuous dissipation at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low trigger; internal 250µA pull-up enables direct switch connection; debounced by ≥140ms reset pulse |
| 2 (VCC) | +5V Supply Input | Primary power rail; operates from 1.0V to 5.5V; powers all internal comparators, timer, and outputs |
| 3 (GND) | Ground Reference | 0V return for all analog and digital functions; must be low-impedance for accurate threshold sensing |
| 4 (PFI) | Power-Fail Input | Noninverting input of 1.25V comparator; accepts voltage dividers for monitoring +12V, -5V, or other rails |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; used for NMI or orderly shutdown signaling |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO timeout; floating disables watchdog function |
| 7 (RESET) | Active-Low Reset Output | Push-pull output; guaranteed low ≤0.4V at VCC = 1V; pulses low for 200ms on power-up or brownout |
| 8 (WDO) | Watchdog Output | Open-drain active-low output; goes low on timeout or VCC < 4.65V; no minimum pulse width guarantee |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET at VCC = 1V | Enables robust reset assertion during ultra-low-voltage power sequencing and battery backup scenarios |
| Integrated 1.25V Precision Reference | Allows accurate power-fail or low-battery detection on any rail using external resistor dividers |
| Debounced Manual-Reset Input | Eliminates need for external RC filtering; 150ns MR pulse width tolerance supports fast-switching inputs |
| Independent Watchdog & Reset Paths | Prevents false resets from watchdog activity; WDO can be connected to MR only when intentional reset initiation is required |
| µMAX Package Footprint | 3.0mm × 3.0mm area saves >60% board space vs. SO-8; compatible with standard reflow profiles (260°C peak) |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Real-time control loop execution with fail-safe shutdown upon AC loss or battery depletion. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during brownout and generating PFO interrupt for data save before power collapse. Use Value: Prevents corrupted EEPROM writes and motor runaway by guaranteeing 200ms reset hold and 1.25V-triggered early warning. |
Use Scenario: Battery-powered portable device requiring deterministic startup and low-power sleep mode supervision. IC Role / Device Role / Timing Role: Monitoring main +5V rail and backup battery voltage via PFI divider; asserting RESET if VCC drops below 4.65V. Use Value: Ensures FDA-compliant fault response with guaranteed 1V-valid RESET and sub-1µA standby current during battery backup. |
| Telecom Line Card | Automotive Body Control Module |
Use Scenario: Hot-swap power insertion into live backplane with transient immunity and clean reset sequencing. IC Role / Device Role / Timing Role: Detecting +5V rail dip during hot-plug event; generating synchronized RESET and PFO signals to halt I/O activity. Use Value: Avoids bus contention and register corruption using 40mV hysteresis and 2µs reset response time. |
Use Scenario: 12V automotive system with wide input range (9–16V) and cold-crank voltage sag below 6V. IC Role / Device Role / Timing Role: Monitoring regulated +5V supply derived from vehicle battery; asserting RESET during cranking-induced brownout. Use Value: Maintains ECU state integrity with 4.65V threshold and 200ms pulse - sufficient for microcontroller POR requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CUA+ | 4.40V reset threshold (vs. 4.65V); identical pinout, timing, and feature set | Suitable for systems with tighter +5V tolerance or lower-noise power supplies where earlier reset assertion is needed | Select MAX706CUA+ only when design requires reset at 4.40V - not a drop-in replacement due to threshold mismatch |
| MAX813LCUA+ | Active-high RESET output (RESET) instead of active-low; same 4.65V threshold, 200ms pulse, and watchdog | Required for Intel 80C51-family or other µPs mandating active-high reset polarity | Choose MAX813LCUA+ when µP reset input is active-high; pin-compatible but functionally distinct output behavior |
Compared with MAX705CUA+, MAX706CUA+ lowers reset activation voltage by 250mV for earlier fault response, while MAX813LCUA+ changes reset polarity to active-high - both retain identical µMAX packaging, watchdog timing, and power-fail comparator functionality.
Availability
MAX705CUA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, telecom line cards, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX705CUA+ 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, interface, and reliability-critical applications.
The MAX705–MAX708/MAX813L family was engineered specifically for cost-sensitive microprocessor systems needing integrated reset, watchdog, and power-fail monitoring in minimal footprint - targeting embedded control, instrumentation, and communications equipment.
FAQ
What is the reset threshold voltage for MAX705CUA+?
The MAX705CUA+ has a nominal reset threshold of 4.65V, with a guaranteed range of 4.50V to 4.75V across temperature and supply conditions. This threshold triggers an active-low RESET pulse whenever VCC falls below the limit during power-down or brownout events, and holds RESET low until VCC rises above threshold plus 40mV hysteresis.
Does MAX705CUA+ support manual reset functionality?
Yes, MAX705CUA+ includes a dedicated active-low manual-reset input (MR) on Pin 1. It features an internal 250µA pull-up current, accepts TTL/CMOS logic levels, and requires only a momentary ground connection to initiate a full 200ms reset pulse - eliminating need for external debounce circuitry.
Can MAX705CUA+ monitor voltages other than +5V?
Yes, MAX705CUA+ can monitor non-+5V rails using its PFI input and internal 1.25V reference. By connecting a resistor divider from the target voltage to PFI, designers can configure early-warning detection for +12V, -5V, or battery supplies - with accuracy dependent on resistor tolerance and PFI threshold variation.
What is the watchdog timeout period for MAX705CUA+?
The MAX705CUA+ watchdog timer has a nominal timeout period of 1.6 seconds, with a specified range of 1.00s to 2.25s. The timer resets on any rising or falling edge at WDI (Pin 6), and asserts WDO low if WDI remains static beyond timeout - enabling detection of software lockup in microprocessor systems.
Is MAX705CUA+ compatible with the µMAX package footprint?
Yes, MAX705CUA+ is manufactured exclusively in the 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm. Its pinout matches industry-standard µMAX supervisory IC layouts, and it supports lead-free reflow soldering up to +260°C - ensuring drop-in compatibility with existing µMAX land patterns.
MAX705CUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX705CUA+ FAQ
1.How can I place an order for MAX705CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705CUA+ 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 MAX705CUA+ reliable?
The price and inventory of MAX705CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705CUA+ is usually 5 days.
3.What payment methods are accepted for MAX705CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705CUA+?
MAX705CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705CUA+ 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 MAX705CUA+?
For technical support, including MAX705CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705CUA+ requirements.
6.How does Aetrix verify that MAX705CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX705CUA+ 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 MAX705CUA+ meets industry standards.
7.What is the process for return or replacement of MAX705CUA+?
All MAX705CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX705CUA+, 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 MAX705CUA+ part is unused and in its original packaging.
Return procedure for MAX705CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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