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Analog Devices Inc./Maxim Integrated MAX704TCSA+
- Part No.:
- MAX704TCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704TCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,179
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Product details
Overview
MAX704TCSA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low RESET output, 3.075V reset threshold, 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover-designed for reliable power monitoring in battery-powered embedded controllers and portable equipment.
For engineers reviewing the MAX704TCSA+ datasheet, MAX704TCSA+ pinout, MAX704TCSA+ application, or MAX704TCSA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts for 3.0V/3.3V µP systems requiring brownout protection, manual reset, and RAM backup switching.
Technical Context
The MAX704TCSA+ integrates a precision voltage monitor with ±4% reset threshold tolerance, a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power switch: VCC-to-VOUT via 3Ω PMOS and VBATT-to-VOUT via 140Ω NMOS. It asserts RESET low during VCC < 3.075V, MR assertion, or watchdog timeout.
Battery switchover activates when VCC falls below 2.40V (VSW) while VBATT > VCC, ensuring CMOS RAM retention before VOUT drops near 2.0V; recovery reconnects VOUT to VCC only after VCC rises above the reset threshold-not at VSW-to guarantee supply stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±4%) - triggers reset before 3.3V supply drops below system-safe margin for µP operation |
| Reset Timeout Period | 200ms (140–280ms over temp) - ensures µP completes full reset sequence before code execution resumes |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects µP lockup without requiring software intervention |
| VCC Supply Current | 40µA typical (VCC < 3.6V) - enables ultra-low-power operation in battery-backed systems |
| Battery Supply Current | 1µA max (VBATT mode) - minimizes lithium cell drain during extended backup periods |
| Power-Fail Threshold | 1.237V ±20mV - provides accurate undervoltage detection for auxiliary supplies via PFI/PFO |
| Operating Voltage Range | VCC = 3.17V to 5.5V - supports 3.3V systems with ±5% tolerance and headroom for transient surges |
Pinout & Package
MAX704TCSA+ is housed in an 8-pin SOIC package (SO-8, 150mil width), RoHS-compliant with lead-free finish (+ suffix). Pin functions are validated per Maxim's official pin description table and block diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS); maintains RAM power during brownout |
| 2 - VCC | Main system supply input | Primary 3.3V power source; powers internal circuitry and defines reset comparator reference |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; substrate tied to higher of VCC/VBATT |
| 4 - PFI | Power-fail input | Monitors auxiliary supply via external divider; asserts PFO low when voltage falls below 1.237V |
| 5 - PFO | Power-fail open-drain output | Signals supply failure to µP or can be wired to MR for automatic reset on auxiliary rail collapse |
| 6 - WDI | Watchdog input | Edge-sensitive input; resets watchdog timer on rising/falling transition; no disable function |
| 7 - RESET | Active-low reset output | Open-drain output asserted low during VCC undervoltage, MR low, or watchdog timeout; requires external pull-up |
| 8 - VBATT | Backup battery input | Accepts up to 6V; enables seamless switchover even when VBATT exceeds VCC (e.g., 3.6V Li-cell) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion down to VCC = 1V | Ensures fail-safe reset behavior even during deep brownout, preventing µP runaway before complete power loss |
| Battery can exceed VCC in normal operation | Supports standard 3.6V lithium coin cells without level-shifting or clamping, simplifying backup power design |
| 200ms reset time delay with temperature stability | Remains within 140–280ms across –40°C to +85°C, eliminating need for external timing components |
| 40µA VCC supply current (typical) | Reduces quiescent load on primary supply-critical for multi-year battery life in portable instrumentation |
| Manual reset with internal 70µA pull-up | Enables momentary switch interface without external resistor; debouncing handled by 200ms timeout |
Applications
| Battery-Powered Portable Equipment | Embedded Controller Power Monitoring |
|---|---|
Use Scenario: Handheld data loggers powered by single-cell Li-ion with SRAM retention requirement during power interruption. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, manual reset, and automatic VBATT switchover to preserve RAM contents. Use Value: Enables 10+ year battery life (via 40µA VCC current) and guaranteed RAM retention down to 1V VCC using 3.6V backup cell. |
Use Scenario: Industrial PLC module operating from 3.3V regulated rail with risk of intermittent supply sag due to motor switching. IC Role / Device Role / Timing Role: Real-time voltage monitor asserting RESET within 200ms of VCC falling below 3.075V to halt unsafe execution. Use Value: Prevents corrupted I/O writes and firmware crashes by enforcing deterministic reset timing under dynamic load conditions. |
| Intelligent Instrumentation | Critical µP Power Monitoring |
Use Scenario: Medical sensor node with EEPROM and SRAM storing calibration data and real-time measurements. IC Role / Device Role / Timing Role: Dual-function supervisor delivering both power-fail warning (PFI/PFO) and hard reset (RESET) on same die. Use Value: Allows graceful shutdown and data save upon PFO alert, then forces full reset if VCC collapses further-no separate comparators needed. |
Use Scenario: Aerospace telemetry unit where µP must never execute invalid code during launch vibration-induced power glitches. IC Role / Device Role / Timing Role: Immune reset generator rejecting sub-40µs VCC transients (100mV overdrive) while asserting reset on sustained brownout. Use Value: Eliminates false resets from mechanical noise while guaranteeing response to actual supply failure-validated per Figure 7 timing curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TCSA+ | No watchdog timer; lacks WDI pin and 1.6s timeout function | Suitable only where manual reset and voltage monitoring suffice-no autonomous µP lockup recovery | Select MAX706TCSA+ when watchdog functionality is unnecessary and BOM cost reduction is prioritized |
| MAX802TCSA+ | Tighter reset threshold tolerance (±2% vs. ±4%) and improved PFI accuracy (±2% vs. ±4%) | Better suited for high-precision 3.3V systems with strict supply regulation requirements | Choose MAX802TCSA+ when system-level voltage tolerance demands <±3% reset accuracy over temperature |
Compared with MAX704TCSA+, MAX706TCSA+ removes watchdog capability but reduces complexity and cost, while MAX802TCSA+ enhances voltage-monitoring precision at the expense of slightly higher supply current-enabling trade-offs between reliability, accuracy, and power budget.
Availability
MAX704TCSA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, intelligent instruments, critical µP power monitoring, and portable equipment requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX704TCSA+ 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 power, sensing, and connectivity in demanding industrial and embedded systems.
The MAX704TCSA+ belongs to Maxim's µP supervisory family targeting 3.0V/3.3V systems, engineered to replace discrete reset circuits with integrated voltage monitoring, watchdog, and battery switchover-reducing board space and improving system-level reliability.
FAQ
What is the exact reset threshold voltage for MAX704TCSA+?
The MAX704TCSA+ has a nominal reset threshold of 3.075V, with a guaranteed range of 3.00V to 3.15V during VCC falling and 3.00V to 3.17V during VCC rising. This value is fixed by the "T" suffix and applies across the full operating temperature range (–40°C to +85°C), as confirmed in the Electrical Characteristics table on page 2 of the datasheet.
Does MAX704TCSA+ support battery voltage higher than VCC?
Yes, MAX704TCSA+ explicitly supports VBATT exceeding VCC-such as a 3.6V lithium coin cell on a 3.3V system-without external protection. The internal battery switchover circuit activates when VCC falls below 2.40V (VSW) and VBATT > VCC, connecting VBATT to VOUT through a 140Ω switch, as documented in the Backup-Battery Switchover section.
Is the watchdog timer on MAX704TCSA+ disableable?
No, the watchdog timer on MAX704TCSA+ cannot be disabled. It continuously monitors the WDI pin and triggers a reset if no edge transition occurs within 1.6 seconds. The timer clears automatically on any rising or falling edge at WDI or during RESET assertion, as stated in the Watchdog Input section of the Detailed Description.
What package type and RoHS status does MAX704TCSA+ use?
MAX704TCSA+ uses an 8-pin SOIC package (SO-8, 150mil width) with lead-free finish, indicated by the "+" suffix per Maxim's ordering conventions. The package outline is documented as S8+4 in Maxim's land pattern library, and thermal derating is 5.88mW/°C above +70°C, per Absolute Maximum Ratings.
How does MAX704TCSA+ handle VCC transients to avoid false resets?
MAX704TCSA+ rejects short-duration negative-going VCC transients: a 100mV dip below the reset threshold will not trigger reset if duration is ≤40µs, as shown in Figure 7. This immunity is achieved via internal filtering and comparator hysteresis, enabling robust operation in electrically noisy environments without external RC snubbing.
MAX704TCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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-SOIC
MAX704TCSA+ FAQ
1.How can I place an order for MAX704TCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704TCSA+ 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 MAX704TCSA+ reliable?
The price and inventory of MAX704TCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704TCSA+ is usually 5 days.
3.What payment methods are accepted for MAX704TCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704TCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704TCSA+?
MAX704TCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704TCSA+ 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 MAX704TCSA+?
For technical support, including MAX704TCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704TCSA+ requirements.
6.How does Aetrix verify that MAX704TCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX704TCSA+ 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 MAX704TCSA+ meets industry standards.
7.What is the process for return or replacement of MAX704TCSA+?
All MAX704TCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX704TCSA+, 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 MAX704TCSA+ part is unused and in its original packaging.
Return procedure for MAX704TCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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