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Analog Devices Inc./Maxim Integrated MAX705CUA+T
- Part No.:
- MAX705CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX705CUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,377
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Product details
Overview
MAX705CUA+T from Maxim Integrated is a low-cost microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low reset output, 1.6s watchdog timer, 4.65V supply-voltage monitoring, and 1.25V power-fail comparator input - used for reliable power-up sequencing and brownout protection in embedded control systems.
For engineers reviewing the MAX705CUA+T datasheet, MAX705CUA+T pinout, MAX705CUA+T application, or MAX705CUA+T equivalent, this page delivers verified functional identity, validated pin roles, confirmed timing behavior (200ms reset pulse, 1.6s watchdog timeout), and real-world substitution guidance for industrial μP monitoring designs.
Technical Context
The MAX705CUA+T integrates four core supervisory functions: a precision voltage monitor with 4.65V threshold and 40mV hysteresis, a debounced manual-reset input (MR) with 250μA internal pull-up, a watchdog timer that triggers WDO low after 1.6s of no WDI edge, and a 1.25V reference-based power-fail comparator driving PFO.
Its RESET output remains valid down to VCC = 1V (guaranteed ≤0.4V at ISINK = 3.2mA), and all logic inputs are TTL/CMOS-compatible. The device operates over 0°C to +70°C and draws only 150–350µA quiescent current, enabling use in battery-backed or low-power μP systems without compromising supervision integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - asserts RESET when VCC drops below this level, ensuring robust brownout detection for +5V systems |
| Reset Pulse Width | 200ms nominal - guarantees sufficient duration to fully initialize microprocessors like Intel 80C51 or ARM Cortex-M0 |
| Watchdog Timeout | 1.6s ±0.65s - provides deterministic software liveliness monitoring without requiring external timing components |
| Power-Fail Threshold | 1.25V ±50mV - enables accurate early-warning detection of failing +5V rails via external resistor divider |
| Supply Current | 150–350µA - supports long-term operation in battery-supervised applications without significant drain |
| VCC Operating Range | 1.0V to 5.5V - ensures RESET remains functional during deep brownout, down to near-logic-threshold supply levels |
| Manual-Reset Input | TTL/CMOS-compatible with 140ns minimum pulse width - allows pushbutton or logic-driven system reset with built-in debounce |
Pinout & Package
MAX705CUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.8mm height), RoHS-compliant and lead-free, with exposed pad for thermal enhancement. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-Low Manual-Reset Input | Triggers 200ms RESET pulse when pulled below 0.8V; internally pulled up with 250μA current |
| 2 (VCC) | +5V Supply Input | Primary power rail; RESET remains valid down to 1.0V, enabling fail-safe operation during undervoltage |
| 3 (GND) | Ground Reference | Common return for all analog and digital functions; required for accurate 1.25V PFI comparator reference |
| 4 (PFI) | Power-Fail Input | Noninverting input of comparator referenced to 1.25V; used to monitor auxiliary supplies or battery voltage |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output asserting when PFI < 1.25V; can interrupt μP or trigger backup switching |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; floating disables watchdog function |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low for ≥140ms during power-up/brownout; guaranteed logic low at VCC = 1V |
| 8 (WDO) | Watchdog Output | Open-drain active-low output asserting after watchdog timeout or during VCC brownout; no minimum pulse width |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables fail-safe reset assertion even during severe brownout, critical for data retention in battery-backed RAM |
| Debounced TTL/CMOS-compatible MR input | Eliminates need for external RC debounce circuitry; supports direct connection to pushbuttons or GPIO lines |
| Independent 1.25V precision reference for PFI | Allows accurate monitoring of non-5V rails (e.g., +3.3V, +12V, or negative supplies) using simple resistor dividers |
| 200ms reset pulse width with 40mV hysteresis | Prevents spurious resets during marginal supply recovery and ensures full μP initialization time |
| Watchdog timeout independent of VCC level | Timer continues counting during brownout if VCC stays above 1V, enabling reliable software crash detection |
Applications
| Industrial PLC Control | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Programmable logic controller operating in factory environments with fluctuating 24V DC input converted to +5V. IC Role / Device Role / Timing Role: Supervises +5V rail integrity, asserts RESET on brownout, and monitors backup battery voltage via PFI. Use Value: Prevents corrupted I/O state during line sags; 200ms reset ensures deterministic firmware reload before process restart. |
Use Scenario: Portable ultrasound unit with lithium coin-cell backup and dual-rail power management. IC Role / Device Role / Timing Role: Detects main supply failure via PFI, triggers orderly shutdown via PFO interrupt, and maintains RESET until safe state is saved. Use Value: 1.25V PFI threshold enables precise low-battery warning; 150µA supply current extends backup runtime. |
| Automotive Body Control Module | Network Router Power Management |
|
Use Scenario: BCM powered from vehicle battery subject to cold-crank dips below 6V and load-dump transients. IC Role / Device Role / Timing Role: Monitors regulated +5V supply, asserts RESET during cranking-induced brownout, and uses WDI to verify firmware execution. Use Value: 4.65V reset threshold aligns with automotive 5V regulator dropout; watchdog prevents lockup during EMI events. |
Use Scenario: Enterprise-grade router with redundant power supplies and hot-swap capability. IC Role / Device Role / Timing Role: Supervises primary +5V rail, triggers system reset on failure, and uses PFO to switch to secondary supply. Use Value: Open-drain PFO drives external MOSFET for seamless supply switchover; 8-pin µMAX saves board space in dense PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CUA+T | 4.40V reset threshold (vs. 4.65V); otherwise identical pinout, timing, and feature set | Better suited for systems using 4.5V–5.0V regulators with tighter tolerance margins | Select when VCC nominal is ≤4.75V and brownout margin must be lower than 4.65V |
| MAX813LCUA+T | Replaces WDO with active-high RESET output; same 4.65V threshold, 200ms pulse, and PFI/PFO functions | Required for μPs needing active-high reset (e.g., Intel 80C51, some ARM bootloaders) | Choose when host processor lacks internal inverter or requires high-true reset assertion |
Compared with MAX705CUA+T, MAX706CUA+T offers earlier reset assertion for lower-voltage rails, while MAX813LCUA+T eliminates need for external inverter logic - both retain identical µMAX packaging, manual reset, and power-fail monitoring capability.
Availability
MAX705CUA+T is available at Aetrix Electronics and suitable for industrial PLC control, medical diagnostic instruments, automotive body control modules, and network router power management requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX705CUA+T 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, computing, and communications applications, with emphasis on reliability and integration.
The MAX705–MAX708/MAX813L family was engineered specifically for cost-sensitive microprocessor supervision - integrating reset, watchdog, power-fail, and manual-reset functions into single 8-pin packages to reduce board area and BOM count.
FAQ
What is the reset threshold voltage of the MAX705CUA+T?
The MAX705CUA+T has a nominal reset threshold of 4.65V, with guaranteed limits of 4.50V (min) and 4.75V (max) over temperature. This threshold applies to the active-low RESET output and ensures reliable assertion during brownout conditions on +5V systems. The device also includes 40mV hysteresis to prevent chatter near the trip point. This specification is validated per Maxim's datasheet revision 11 (July 2018).
Does the MAX705CUA+T support operation below 5V supply?
Yes, the MAX705CUA+T operates from VCC = 1.0V to 5.5V and guarantees valid RESET output down to 1.0V (≤0.4V at 3.2mA sink). Its internal circuits remain functional at reduced supply voltages, enabling use in battery-backed or ultra-low-power supervision scenarios. However, the 4.65V reset threshold is specified only for VCC ≥ 4.75V; below that, reset behavior follows the internal bandgap reference scaling.
How does the watchdog timer function in the MAX705CUA+T?
The MAX705CUA+T watchdog timer asserts WDO low if the WDI input remains static (high or low) for longer than 1.6 seconds. It clears on any rising or falling edge at WDI, during RESET assertion, or when WDI is three-stated. Pulses as short as 50ns are detected. WDO is open-drain and also goes low during VCC brownout - independent of watchdog state - making it usable as a low-line indicator.
Can the MAX705CUA+T monitor voltages other than +5V?
Yes, the MAX705CUA+T uses a dedicated 1.25V precision reference for its PFI comparator, allowing monitoring of any voltage via an external resistor divider. For example, connecting a 10kΩ/2.2kΩ divider to a +12V rail yields ~2.2V at PFI - triggering PFO when the rail drops below ~11.0V. Hysteresis can be added by feeding PFO back to PFI through a high-value resistor, and noise immunity is enhanced with a capacitor from PFI to GND.
What is the package type and RoHS status of MAX705CUA+T?
The MAX705CUA+T is supplied in an 8-pin µMAX® package (3mm × 3mm, 0.8mm height) with exposed thermal pad. The "+T" suffix confirms lead-free, RoHS-compliant construction per Maxim's ordering conventions. This package is pin-compatible with other members of the MAX705–MAX708/MAX813L family in SO and DIP variants, though footprint and thermal characteristics differ.
MAX705CUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX705CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705CUA+T 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+T reliable?
The price and inventory of MAX705CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705CUA+T is usually 5 days.
3.What payment methods are accepted for MAX705CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705CUA+T?
MAX705CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705CUA+T 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+T?
For technical support, including MAX705CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705CUA+T requirements.
6.How does Aetrix verify that MAX705CUA+T is sourced from the original manufacturer or authorized distributors?
All MAX705CUA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX705CUA+T?
All MAX705CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX705CUA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX705CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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