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Analog Devices Inc./Maxim Integrated MAX704TCSA+T
- Part No.:
- MAX704TCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704TCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,801
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Product details
Overview
MAX704TCSA+T 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. It monitors VCC supply integrity, asserts reset during brownout or watchdog timeout, and switches CMOS RAM to VBATT when VCC falls below 2.40V-used in embedded controllers requiring reliable power-fail detection and nonvolatile memory retention.
For engineers reviewing the MAX704TCSA+T datasheet, MAX704TCSA+T pinout, MAX704TCSA+T application, or MAX704TCSA+T equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1V, ±4% reset threshold accuracy, 40µA VCC supply current, and compatibility with lithium backup batteries exceeding VCC in normal operation.
Technical Context
The MAX704TCSA+T integrates a precision voltage comparator for reset generation, a 1.6-second watchdog timer with edge-triggered clearing, and a dual-path battery switchover circuit using PMOS switches (3Ω VCC-to-VOUT, 140Ω VBATT-to-VOUT). Its reset comparator features 10mV typical hysteresis and guarantees valid output across -40°C to +85°C.
It supports manual reset via an internally pulled-up MR input (70µA pull-up), provides a dedicated PFI/PFO pair for external power-fail monitoring at 1.237V threshold, and delivers active-low open-drain RESET with 0.3V max VOL at 1.2mA sink-designed for direct interface with 3.3V µP reset inputs without external level shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±4%) - triggers reset before 3.3V supply drops below system stability margin |
| Reset Timeout | 200ms (140–280ms range) - ensures µP completes power-up initialization before release |
| VCC Supply Current | 40µA (typ) at VCC < 3.6V - enables long-term operation in battery-backed portable systems |
| Watchdog Timeout | 1.6s (1.12–2.24s) - detects µP lockup while allowing sufficient time for firmware execution cycles |
| Battery Switch Threshold | VSW = 2.40V (2.30–2.50V) - initiates VBATT switchover prior to CMOS RAM data retention limit (~2.0V) |
| PFO Threshold Accuracy | ±75mV - supports reliable external supply monitoring with minimal external component tolerance burden |
| Operating Temp Range | -40°C to +85°C - qualified for industrial embedded controller environments |
Pinout & Package
MAX704TCSA+T is housed in an 8-pin SOIC package (SO, 150mil width) with gull-wing leads, RoHS-compliant (indicated by '+' suffix), and rated for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Supply output for CMOS RAM | Switches between VCC and VBATT; connects to VCC when VCC > VRST, to VBATT when VCC < VSW and VBATT > VCC |
| VCC | Main supply input | Primary 3.0V/3.3V power rail; powers internal circuitry and sources VOUT when active |
| GND | Ground reference | Common return path for all analog and digital functions; substrate tied to higher of VCC/VBATT |
| PFI | Power-fail input | Monitors external supply via resistor divider; asserts PFO low when input falls below 1.237V |
| PFO | Power-fail output | Active-low open-drain signal indicating PFI undervoltage or VCC < VSW; can drive MR on same device |
| MR | Manual reset input | Active-low logic input with 70µA internal pull-up; asserts RESET for duration of low pulse plus 200ms |
| RESET | Active-low reset output | Open-drain output; held low during VCC brownout, watchdog timeout, or MR assertion; guaranteed valid to VCC = 1V |
| VBATT | Backup-battery input | Accepts lithium cell up to 6.0V; supplies VOUT during VCC failure; may exceed VCC without damage |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Enables robust reset signaling even during deep brownout conditions where other supervisors fail |
| Battery switchover with VBATT > VCC support | Allows use of standard 3.6V lithium coin cells without series diode drop or voltage regulation |
| 200ms reset timeout with hysteresis | Prevents oscillation during slow-rising VCC and ensures deterministic µP startup sequence |
| 1.6s watchdog timer with edge-clearing | Eliminates need for external timing components while supporting firmware-driven watchdog refresh |
| 40µA VCC supply current | Extends battery life in always-on monitoring applications such as smart sensors and portable instrumentation |
Applications
| Battery-Powered Embedded Controllers | Intelligent Portable Instruments |
|---|---|
Use Scenario: Industrial handheld meter with lithium backup powering SRAM and real-time clock during main supply interruption. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery switchover, and watchdog supervision for ARM Cortex-M0 host MCU. Use Value: Ensures data integrity during field-deployed power loss events and eliminates need for external reset generator or discrete switchover MOSFET. |
Use Scenario: Handheld gas analyzer requiring continuous sensor calibration memory retention during battery swaps. IC Role / Device Role / Timing Role: Power monitor and RAM backup manager asserting RESET only when VCC falls below 3.075V and switching VOUT to VBATT at 2.40V. Use Value: Maintains SRAM contents for >24 hours on 3.6V CR2032 cell while consuming <1µA in backup mode. |
| Critical µP Power Monitoring | Portable Medical Devices |
Use Scenario: Patient monitor with dual 3.3V rails (main + isolated) where primary rail failure must trigger immediate µP reset and data save. IC Role / Device Role / Timing Role: Primary supervisor detecting VCC brownout and generating 200ms RESET pulse; PFI monitors secondary rail for cross-rail fault detection. Use Value: Prevents corrupted ECG waveform storage by guaranteeing reset before supply collapse reaches µP operational threshold. |
Use Scenario: Wearable insulin pump with safety-critical firmware requiring guaranteed reset on power anomaly and nonvolatile parameter storage. IC Role / Device Role / Timing Role: Safety-enabling supervisory circuit asserting RESET on VCC dip or watchdog stall, while preserving configuration EEPROM via VBATT-backed VOUT. Use Value: Meets IEC 62304 Class B software safety requirements through deterministic reset behavior and battery-backed memory retention. |
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 input and timeout functionality | Suitable only for basic reset-only applications without µP activity monitoring | Select MAX706TCSA+ when watchdog supervision is unnecessary and board space is constrained |
| MAX803TCSA+ | Same 3.075V threshold and 200ms timeout, but no battery switchover (no VBATT/VOUT pins) | Designed for single-supply systems without backup battery requirement | Choose MAX803TCSA+ for cost-sensitive 3.3V µP reset where battery backup is omitted |
Compared with MAX704TCSA+T, MAX706TCSA+ reduces feature set to basic reset generation only, while MAX803TCSA+ removes battery management entirely-making MAX704TCSA+T the sole option among these three that simultaneously delivers reset, watchdog, and switchover in one 8-pin SOIC.
Availability
MAX704TCSA+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 industrial temperature ranges.
Supply support for MAX704TCSA+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 ICs for industrial, automotive, and computing applications, with emphasis on power management and reliability.
The MAX704TCSA+T belongs to Maxim's µP supervisory family targeting 3.0V/3.3V systems, engineered to replace discrete reset generators and battery switchover circuits with integrated, temperature-stable functionality.
FAQ
What is the guaranteed minimum VCC voltage at which MAX704TCSA+T asserts RESET?
The MAX704TCSA+T guarantees RESET assertion for VCC down to 1V, regardless of VBATT state. This ensures reliable reset signaling even during severe brownout conditions where VCC collapses slowly. The specification is validated across the full -40°C to +85°C operating range and applies to both active and battery-backup modes of MAX704TCSA+T.
Does MAX704TCSA+T support lithium batteries with voltage higher than VCC?
Yes, MAX704TCSA+T explicitly supports VBATT voltages exceeding VCC-such as standard 3.6V lithium coin cells-with no external components required. The internal battery switchover circuit activates when VCC falls below 2.40V (VSW), connecting VBATT to VOUT while isolating VCC, and is rated for VBATT up to +6.0V per absolute maximum ratings.
How does the watchdog timer in MAX704TCSA+T clear and timeout?
The MAX704TCSA+T watchdog timer clears on any rising or falling edge at WDI and times out after 1.6 seconds if WDI remains static. It cannot be disabled. When timeout occurs, it triggers RESET assertion for 200ms. The timer restarts only after RESET deasserts, ensuring µP recovery before next watchdog cycle begins-critical for deterministic fault recovery in MAX704TCSA+T deployments.
Can MAX704TCSA+T monitor a second power rail besides VCC?
Yes, MAX704TCSA+T includes a dedicated PFI input with 1.237V threshold and ±75mV accuracy, enabling monitoring of auxiliary supplies (e.g., 5V, 1.8V, or negative rails) via external resistor dividers. When PFI falls below threshold, PFO goes low-optionally connected to MR to generate a system reset, extending MAX704TCSA+T's role beyond primary VCC supervision.
What package type and RoHS status does MAX704TCSA+T use?
MAX704TCSA+T uses an 8-pin SOIC (Small Outline Integrated Circuit) package, 150mil body width, with gull-wing leads. The '+' suffix in the part number confirms RoHS-compliant, lead-free construction per Maxim Integrated's packaging standards-verified in the official package outline document 21-0041 for S8+4 code.
MAX704TCSA+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:
- 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+T FAQ
1.How can I place an order for MAX704TCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704TCSA+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 MAX704TCSA+T reliable?
The price and inventory of MAX704TCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704TCSA+T is usually 5 days.
3.What payment methods are accepted for MAX704TCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704TCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704TCSA+T?
MAX704TCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704TCSA+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 MAX704TCSA+T?
For technical support, including MAX704TCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704TCSA+T requirements.
6.How does Aetrix verify that MAX704TCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX704TCSA+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 MAX704TCSA+T meets industry standards.
7.What is the process for return or replacement of MAX704TCSA+T?
All MAX704TCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX704TCSA+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 MAX704TCSA+T part is unused and in its original packaging.
Return procedure for MAX704TCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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