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Analog Devices Inc./Maxim Integrated MAX704CSA-T
- Part No.:
- MAX704CSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704CSA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,846
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Product details
Overview
MAX704CSA-T from Maxim Integrated is a microprocessor supervisory circuit providing precision 4.40V supply-voltage monitoring, battery-backup switching, 1.25V power-fail detection, and debounced manual reset in an 8-pin SO package. It ensures reliable μP reset during power-up, brownout, and power-down events while preserving CMOS RAM data via automatic VBATT switchover.
For engineers reviewing the MAX704CSA-T datasheet, MAX704CSA-T pinout, MAX704CSA-T application, or MAX704CSA-T equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1V, 200ms reset pulse width, 50nA battery-backup quiescent current, and compatibility with lithium backup batteries (3.0–3.6V) and supercapacitor sources.
Technical Context
The MAX704CSA-T integrates four core functions: a precision bandgap-based voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis; a p-channel MOSFET-based battery switchover circuit with 20mV activation threshold and 40mV hysteresis; a 1.25V ±50mV power-fail comparator with <25nA input bias; and a TTL/CMOS-compatible manual reset input with internal 250µA pullup.
Its reset generator asserts active-low RESET for ≥140ms (typ. 200ms) after VCC rises above threshold or MR transitions low-to-high, and maintains valid RESET output down to VCC = 1V. In battery-backup mode (VCC < VRST), internal circuitry powers from VBATT, disconnecting VCC from VOUT and forcing PFO/RESET low while disabling PFI/MR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - guarantees reliable μP reset initiation when +5V supply drops below safe operating level |
| Reset Pulse Width | 140–280ms - ensures sufficient duration to fully initialize microprocessors and peripheral logic |
| Quiescent Current | 200–350µA - enables low-power system monitoring without significant VCC load |
| Battery-Backup Current | 50nA - minimizes self-discharge of lithium coin cells during extended backup operation |
| Power-Fail Threshold | 1.25V ±50mV - provides accurate undervoltage warning for unregulated supplies or low-battery detection |
| VBATT Switch Threshold | 20mV - triggers seamless RAM power transfer before VCC collapse causes data loss |
| RESET Valid Down To | VCC = 1V - maintains defined logic state during deep brownout, preventing floating reset inputs |
Pinout & Package
MAX704CSA-T is housed in an 8-pin SO (Small Outline) package with standard 150-mil body width and gull-wing leads. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | RAM Supply Output | Switches between VCC (via 5Ω p-MOSFET) and VBATT (via 80Ω p-MOSFET) based on supply status; delivers regulated power to CMOS RAM |
| 2 VCC | +5V Supply Input | Main system power input; monitored for reset generation and used as reference for internal comparators |
| 3 GND | Ground Reference | Common return path for all analog and digital circuitry; must be low-impedance for stable reset timing |
| 4 PFI | Power-Fail Input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V for early power-fail warning |
| 5 PFO | Power-Fail Output | Open-drain output signaling power failure; disabled and forced low during battery-backup mode |
| 6 MR | Manual Reset Input | Active-low TTL/CMOS-compatible input with internal 250µA pullup; debounced by 200ms reset timer |
| 7 RESET | Reset Output | Active-low open-drain output asserted during power-up, brownout, or MR activation; sinks up to 3.2mA |
| 8 VBATT | Battery Backup Input | Accepts 2.8–4.55V lithium or supercap source; enables automatic RAM power switchover when VCC fails |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V Reset Monitor | Guarantees reset assertion at exactly 4.40V ±150mV, eliminating need for external resistor dividers in +5V systems |
| Automatic Battery Switchover | Transfers RAM supply from VCC to VBATT within 20mV of threshold crossing, preventing data corruption during power loss |
| 200ms Debounced Manual Reset | Eliminates mechanical switch bounce effects without external RC networks, simplifying pushbutton interface design |
| 1.25V Power-Fail Comparator | Enables flexible monitoring of non-+5V rails (e.g., unregulated DC, negative supplies) using external resistive dividers |
| 50nA Battery-Backup Quiescent Current | Extends lithium coin cell life to >10 years in typical backup applications, reducing maintenance and replacement cost |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Maintaining volatile configuration memory and real-time clock data during AC mains interruption or brownout events. IC Role / Device Role / Timing Role: Supervisory IC providing guaranteed RESET assertion and automatic VBATT switchover to preserve SRAM contents. Use Value: Prevents loss of calibration settings and patient history data during brief power disruptions, meeting IEC 60601-1 continuity requirements. | Use Scenario: Ensuring deterministic boot sequence and memory integrity in portable ultrasound units powered by rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Voltage monitor and reset generator coordinating power sequencing between main supply and backup battery. Use Value: Guarantees 200ms reset pulse width even as battery voltage decays, enabling full firmware initialization before clinical operation. |
| Automotive Infotainment Head Units | Point-of-Sale (POS) Terminals |
Use Scenario: Preserving user preferences and firmware state during vehicle ignition cycling or alternator voltage sag. IC Role / Device Role / Timing Role: Brownout detector and RAM power manager interfacing with 5V domain and 3.3V logic subsystems. Use Value: Uses 4.40V threshold aligned with automotive 5V regulator dropout, avoiding spurious resets during engine cranking. | Use Scenario: Securing transaction logs and encryption keys in retail terminals subjected to frequent unplanned power loss. IC Role / Device Role / Timing Role: Dual-function supervisor handling both main supply monitoring and battery-backed memory retention. Use Value: Delivers 50nA backup current enabling CR2032 coin cell to sustain 10+ years of memory retention without field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704ESA | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range vs. 0°C to +70°C for MAX704CSA-T | Required for extended-temperature deployments such as outdoor kiosks or under-hood automotive modules | Select MAX704ESA when ambient operating temperature exceeds +70°C or falls below 0°C |
| MAX706CSA | Lacks battery-backup switching; includes CE write-protect and watchdog timer not present in MAX704CSA-T | Suitable for systems requiring hardware write protection or timeout supervision, but cannot retain RAM during power loss | Choose MAX706CSA only if battery backup is unnecessary and watchdog/CE features are required |
Compared with MAX704ESA, MAX704CSA-T offers lower cost and sufficient performance for commercial-temperature applications, while MAX706CSA trades battery backup for enhanced system-level supervision features-making it unsuitable as a drop-in replacement where RAM retention is critical.
Availability
MAX704CSA-T is available at Aetrix Electronics and suitable for industrial controllers, medical diagnostics equipment, automotive infotainment systems, and point-of-sale terminals requiring stable component supply across production lifecycles.
Supply support for MAX704CSA-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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, computing, and consumer markets.
The MAX703/MAX704 product line delivers cost-optimized microprocessor supervisory circuits focused on power-monitoring accuracy, battery-backed memory retention, and robust reset timing for embedded systems with strict reliability requirements.
FAQ
What is the guaranteed reset threshold voltage for MAX704CSA-T?
The MAX704CSA-T guarantees a reset threshold voltage of 4.40V with a tolerance of ±150mV (4.25V to 4.50V) over the full 0°C to +70°C operating temperature range. This precise threshold ensures consistent reset behavior in +5V systems, eliminating the need for external trimming components and directly supporting applications where supply margin is tightly constrained.
Does MAX704CSA-T support lithium coin cell backup batteries?
Yes, MAX704CSA-T supports standard 3.0V to 3.6V lithium coin cells (e.g., CR2032) as backup sources. Its VBATT input accepts voltages up to 4.55V, and its 50nA quiescent current in battery-backup mode enables multi-year retention of CMOS RAM data. The device automatically switches VOUT to VBATT when VCC falls below 4.40V, ensuring uninterrupted memory power during main supply failure.
Can MAX704CSA-T generate reset pulses longer than 200ms?
No, MAX704CSA-T provides a fixed reset pulse width of 140ms minimum, 200ms typical, and 280ms maximum. This timing is internally generated and not adjustable. For applications requiring programmable or extended reset durations, consider alternatives like the MAX791 or MAX693A, which offer adjustable timeout periods via external capacitors or resistors.
How does MAX704CSA-T handle power-fail detection during battery-backup mode?
During battery-backup mode (VCC < 4.40V), MAX704CSA-T disables the power-fail comparator and forces PFO low regardless of PFI voltage. This prevents false interrupts during backup operation and conserves power. PFI remains functional only when VCC is above the reset threshold, ensuring accurate early-warning detection of upstream supply degradation before brownout occurs.
Is MAX704CSA-T pin-compatible with MAX703CSA-T?
Yes, MAX704CSA-T is pin-compatible with MAX703CSA-T, sharing identical 8-pin SO packaging, pinout, and electrical interface. The sole functional difference is the reset threshold: 4.40V for MAX704CSA-T versus 4.65V for MAX703CSA-T. This allows direct substitution in designs where tighter supply margin or lower reset voltage is required, without PCB layout changes.
MAX704CSA-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- 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
MAX704CSA-T FAQ
1.How can I place an order for MAX704CSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704CSA-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 MAX704CSA-T reliable?
The price and inventory of MAX704CSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704CSA-T is usually 5 days.
3.What payment methods are accepted for MAX704CSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704CSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704CSA-T?
MAX704CSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704CSA-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 MAX704CSA-T?
For technical support, including MAX704CSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704CSA-T requirements.
6.How does Aetrix verify that MAX704CSA-T is sourced from the original manufacturer or authorized distributors?
All MAX704CSA-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 MAX704CSA-T meets industry standards.
7.What is the process for return or replacement of MAX704CSA-T?
All MAX704CSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX704CSA-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 MAX704CSA-T part is unused and in its original packaging.
Return procedure for MAX704CSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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