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Analog Devices Inc./Maxim Integrated MAX704SCSA+T
- Part No.:
- MAX704SCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704SCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
MAX704SCSA+T from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low RESET output, 2.925V reset threshold, 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover-designed for embedded controllers and battery-powered systems requiring reliable power monitoring and RAM retention during brownout.
For engineers reviewing the MAX704SCSA+T datasheet, MAX704SCSA+T pinout, MAX704SCSA+T application, or MAX704SCSA+T equivalent, this page delivers verified functional specs, validated pin roles, confirmed operating conditions (VCC = 3.02V–5.5V, TA = 0°C to +70°C), and real-world design implications for power-fail warning, manual reset integration, and lithium-battery-backed CMOS RAM support.
Technical Context
The MAX704SCSA+T 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 enabling VOUT to connect to VCC above 2.925V or to VBATT when VCC falls below 2.40V (VSW). Its internal 70µA MR pull-up eliminates external biasing.
It features separate PFI/PFO circuitry with 1.237V threshold and 10mV hysteresis, independent of reset logic; battery leakage is limited to ≤1µA (typ) in backup mode; and RESET assertion is guaranteed down to VCC = 1V, supporting ultra-low-voltage brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (VCC falling), ±4% tolerance - ensures reset triggers before 3.3V supply drops below system minimum operating voltage. |
| Reset Timeout Period | 200ms (typ) - guarantees µP remains held in reset long enough for stable power rail recovery and clock stabilization. |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables multi-year operation in battery-backed portable instruments without significant drain. |
| Watchdog Timeout | 1.6s (typ) - provides sufficient margin to detect firmware lockup while avoiding false triggers from slow I²C or UART handshakes. |
| Battery Supply Current | 1µA (max, TA = 0°C to +70°C) - preserves lithium cell life over >10-year shelf storage in critical data loggers. |
| Power-Fail Threshold | 1.237V at PFI input - allows precise undervoltage detection of auxiliary rails (e.g., 5V or -12V) via resistor divider without loading. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial control panels and medical handheld devices. |
Pinout & Package
MAX704SCSA+T is housed in an 8-pin SOIC package (SO, 150mil width), RoHS-compliant (indicated by '+' suffix), with standard JEDEC MS-012AC outline and 90-0096 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT via internal PMOS; connects to RAM VDD to maintain data during main supply failure. |
| 2 - VCC | Main power input | Accepts 3.02V–5.5V; powers internal circuitry and sources VOUT when above reset threshold. |
| 3 - GND | Ground reference | Common return for all analog and digital functions; requires local 0.1µF decoupling per datasheet layout guidance. |
| 4 - PFI | Power-fail comparator input | Monitors auxiliary supply via external divider; asserts PFO low when voltage falls below 1.237V. |
| 5 - PFO | Power-fail open-drain output | Sinks current when PFI < 1.237V or VCC < 2.40V; can drive MR on MAX704/806 to trigger system reset. |
| 6 - WDI | Watchdog timer input | Edge-sensitive (rising/falling); resets watchdog timer on transition; tied high/low causes 1.6s timeout and reset. |
| 7 - RESET | Active-low reset output | Push-pull, asserted low during power-up/brownout/watchdog fault/manual reset; holds µP in known state for 200ms. |
| 8 - VBATT | Battery backup input | Accepts up to 6.0V; supplies VOUT when VCC drops below 2.40V; may exceed VCC (e.g., 3.6V Li-cell). |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.925V with ±4% tolerance over 0°C to +70°C - matches 3.3V ±10% system supply spec without external trimming. |
| Guaranteed RESET assertion to VCC = 1V | Enables robust brownout recovery in low-power sleep modes where VCC may sag to 1.2V before shutdown. |
| Battery-backup switchover | VOUT automatically switches to VBATT when VCC falls below 2.40V - preserves CMOS RAM data without software intervention. |
| Manual reset with internal pull-up | 70µA MR pull-up eliminates external resistor; supports direct switch-to-ground or TTL/CMOS logic drive. |
| Low quiescent current | 40µA VCC supply current (typ) - extends battery life in always-on remote sensors and portable test equipment. |
Applications
| Battery-Powered Embedded Controller | Intelligent Data Logger |
|---|---|
Use Scenario: Industrial temperature/humidity sensor node powered by AA batteries with nonvolatile SRAM storing calibration data. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output, asserts RESET during battery depletion, switches VOUT to backup coin cell when main supply drops below 2.925V. Use Value: Prevents corrupted memory writes during brownout; maintains 10+ year data retention using <1µA battery leakage. |
Use Scenario: Portable environmental monitor logging GPS position and air quality every 30 seconds, with flash memory and RTC. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and 5V USB charging path via PFI divider; triggers PFO→MR reset if charger disconnects unexpectedly. Use Value: Ensures clean reboot and timestamp continuity after power interruption; avoids partial log entries due to unstable VCC. |
| Critical µP Power Monitoring | Portable Medical Instrument |
Use Scenario: Handheld blood glucose meter with ARM Cortex-M0 MCU and EEPROM-based patient history storage. IC Role / Device Role / Timing Role: Generates 200ms RESET pulse on power-up and brownout; feeds WDI with periodic GPIO toggle to detect firmware hang. Use Value: Guarantees deterministic boot sequence and safe shutdown before EEPROM write corruption occurs. |
Use Scenario: Battery-operated pulse oximeter with OLED display and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Supplies VOUT to SRAM holding real-time SpO₂ buffers; uses PFO to warn MCU of impending low-battery condition via interrupt. Use Value: Enables graceful UI shutdown and data save before power loss; reduces false alarms via 10mV PFI hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704TC SA+T | Reset threshold 3.075V (±4%), higher trip point for tighter 3.3V ±5% systems | Better suited for designs with minimal supply ripple where earlier reset assertion is required | Select when system VCC must not dip below 3.075V before reset activation |
| MAX706SCSA+T | No watchdog timer; no WDI pin; adds PFI hysteresis enable/disable control | Lacks autonomous fault detection but offers simpler timing behavior and lower BOM count | Choose for cost-sensitive, non-safety-critical applications where software-controlled reset suffices |
Compared with MAX704SCSA+T, MAX704TCSA+T provides earlier reset assertion for stricter supply regulation, while MAX706SCSA+T trades watchdog capability for reduced complexity and absence of WDI-related layout constraints.
Availability
MAX704SCSA+T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply across commercial temperature range and long-term production cycles.
Supply support for MAX704SCSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power-up, brownout, and watchdog protection in 3.0V/3.3V embedded systems with battery backup requirements.
FAQ
What is the exact reset threshold voltage for MAX704SCSA+T?
The MAX704SCSA+T has a nominal reset threshold of 2.925V when VCC is falling, with ±4% tolerance over 0°C to +70°C. This value is factory-trimmed and specified in the Electrical Characteristics table under VRST for MAX704S variants. It ensures reset assertion before the 3.3V supply drops below 2.85V, aligning with 3.3V ±10% system specifications.
Does MAX704SCSA+T include a watchdog timer, and how is it configured?
Yes, MAX704SCSA+T includes a 1.6s watchdog timer (tWD = 1.12–2.24s) that cannot be disabled. It monitors the WDI pin: any absence of rising or falling edges for >1.6s triggers a RESET pulse. The timer clears on each WDI transition or during RESET assertion. No external components or configuration registers are needed - operation is fully hardware-based.
Can MAX704SCSA+T support lithium battery backup with voltage higher than VCC?
Yes, MAX704SCSA+T explicitly supports VBATT > VCC (e.g., 3.6V lithium cell with 3.3V system rail). Its battery switchover circuit activates when VCC falls below 2.40V (VSW), connecting VBATT to VOUT through a 140Ω internal switch. VBATT may range from –0.3V to +6.0V, and leakage is limited to ≤1µA - making it ideal for long-life battery-backed RAM applications.
What is the function of the PFI and PFO pins on MAX704SCSA+T?
PFI is a dedicated 1.237V comparator input used to monitor auxiliary power rails (e.g., 5V or negative supplies) via external resistor dividers. When PFI voltage falls below 1.237V, PFO - an open-drain output - pulls low. PFO can drive interrupts or be connected to MR on MAX704/806 to initiate a system reset, providing flexible power-fail response without µP firmware involvement.
Is MAX704SCSA+T pin-compatible with other members of the MAX704 family?
Yes, all MAX704x variants (T/S/R suffixes) share identical 8-pin SOIC pinout and footprint. The S suffix denotes 2.925V reset threshold, T is 3.075V, and R is 2.625V - only the threshold differs. Electrical characteristics including VCC range, RESET timing, watchdog behavior, and battery current are consistent across suffixes, enabling drop-in replacement within same temperature grade (C = 0°C to +70°C).
MAX704SCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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
MAX704SCSA+T FAQ
1.How can I place an order for MAX704SCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704SCSA+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 MAX704SCSA+T reliable?
The price and inventory of MAX704SCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704SCSA+T is usually 5 days.
3.What payment methods are accepted for MAX704SCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704SCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704SCSA+T?
MAX704SCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704SCSA+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 MAX704SCSA+T?
For technical support, including MAX704SCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704SCSA+T requirements.
6.How does Aetrix verify that MAX704SCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX704SCSA+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 MAX704SCSA+T meets industry standards.
7.What is the process for return or replacement of MAX704SCSA+T?
All MAX704SCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX704SCSA+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 MAX704SCSA+T part is unused and in its original packaging.
Return procedure for MAX704SCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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