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Analog Devices Inc./Maxim Integrated MAX704TESA
- Part No.:
- MAX704TESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704TESA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,717
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Product details
Overview
MAX704TESA from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low RESET output, 3.075V reset threshold (T-suffix), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover. It monitors VCC supply integrity, asserts reset during power-up/brownout/watchdog timeout, and switches VOUT to VBATT when VCC falls below 2.40V - used in battery-backed embedded controllers requiring reliable power sequencing and RAM retention.
For engineers reviewing the MAX704TESA datasheet, MAX704TESA pinout, MAX704TESA application, or MAX704TESA equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in portable instrumentation and critical µP systems, and validated alternative parts with documented functional differences.
Technical Context
The MAX704TESA integrates a precision reset comparator with ±4% threshold tolerance (3.075V nominal), a 1.6-second watchdog timer that clears on WDI edge transitions, and a bidirectional battery switchover circuit with 140Ω VBATT-to-VOUT on-resistance and 3Ω VCC-to-VOUT PMOS switch. Its PFI input accepts external voltage monitoring with 1.237V threshold and 10mV hysteresis.
It features manual reset (MR) with internal 70µA pull-up, guaranteed RESET assertion down to VCC = 1V, and operates across 0°C to +70°C. The device supports both 3.0V and 3.3V systems, with VCC operating range of 3.17V to 5.5V and VBATT up to 6.0V - enabling lithium battery backup exceeding VCC without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±4%) - ensures reset assertion before 3.3V supply drops below system stability margin |
| Reset Timeout Period | 200ms (140–280ms over temp) - provides sufficient deassertion delay for µP initialization and clock stabilization |
| VCC Supply Current | 40µA (typ) at VCC < 3.6V - enables ultra-low-power operation in always-on battery-backed systems |
| VBATT Supply Current | 0.4–1µA - minimizes battery drain during extended backup mode |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects µP lockup while allowing normal software servicing intervals |
| Battery Switchover Threshold | VSW = 2.40V (2.30–2.50V) - triggers backup before CMOS RAM voltage falls below 2.0V retention limit |
| PFO Input Threshold | 1.237V (±25mV) - supports accurate external power-fail detection via resistor divider |
Pinout & Package
MAX704TESA is housed in an 8-pin SOIC (SO) package with 1.27mm pitch, RoHS-compliant, surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS) based on VCC/VBATT comparison; must be decoupled with 0.1µF capacitor |
| 2 - VCC | Main supply input | Accepts 3.17–5.5V; powers internal circuitry and drives VOUT when above VSW; absolute max = +6.0V |
| 3 - GND | Ground reference | Common return for all analog/digital functions; substrate tied to higher of VCC or VBATT |
| 4 - PFI | Power-fail input | Monitors external supply via resistor divider; asserts PFO low when voltage falls below 1.237V; input leakage ≤ ±25nA |
| 5 - PFO | Power-fail output | Open-drain active-low signal indicating PFI undervoltage or VCC < VSW; can drive MR on MAX704/MAX806 to trigger reset |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets watchdog timer on transition; timeout occurs if static for >1.6s; cannot be disabled |
| 7 - RESET | Active-low reset output | Push-pull, asserted low during power-up/brownout/watchdog/MR; guaranteed valid down to VCC = 1V; sinks 1.2mA |
| 8 - VBATT | Backup-battery input | Accepts 3.6V lithium cell; may exceed VCC; connects to VOUT when VCC < VSW; leakage ≤ 1µA |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Enables robust reset signaling even during deep brownout, ensuring µP never executes invalid code |
| 200ms reset timeout with temperature-stable timing | Provides consistent, predictable reset hold time across -40°C to +85°C, eliminating need for external RC timing |
| Battery switchover with 2.40V VSW threshold | Activates backup before VOUT drops below 2.0V RAM retention voltage, preserving data integrity during power loss |
| 40µA VCC supply current (typ) | Extends battery life in portable equipment by minimizing quiescent draw during normal operation |
| 1.6s watchdog timer with edge-clearing logic | Prevents false timeouts due to noise or slow edges; requires only one WDI transition every 1.6s to maintain reset deassertion |
| 1.237V PFI comparator with 10mV hysteresis | Rejects supply ripple and noise while maintaining precise trip point for auxiliary rail monitoring |
Applications
| Battery-Powered Embedded Controller | Portable Medical Instrument |
|---|---|
Use Scenario: A handheld glucose meter uses a 3.3V µP and 3.6V lithium coin cell to retain calibration data in CMOS RAM during battery replacement. IC Role / Device Role / Timing Role: MAX704TESA monitors VCC, asserts RESET during power-up/brownout, and switches VOUT from VCC to VBATT when VCC falls below 2.40V. Use Value: Ensures uninterrupted RAM power and deterministic µP reset, preventing data corruption and boot failure during battery swap. |
Use Scenario: A portable ECG monitor operates from rechargeable Li-ion and must retain patient waveform buffers during brief AC adapter disconnection. IC Role / Device Role / Timing Role: MAX704TESA provides 200ms reset hold, 1.6s watchdog supervision, and seamless VOUT switchover to backup supply within 10µs. Use Value: Guarantees continuous data logging and safe µP restart without buffer loss or missed cardiac events during transient power gaps. |
| Industrial Sensor Node | Smart Meter Data Logger |
Use Scenario: A wireless temperature sensor node powered by 3.3V DC-DC converter and backup supercapacitor must survive grid brownouts lasting seconds. IC Role / Device Role / Timing Role: MAX704TESA detects VCC sag, triggers watchdog reset on µP hang, and maintains VOUT from VBATT until VCC recovers above 3.085V. Use Value: Prevents firmware crash and preserves last-valid sensor readings during extended low-voltage conditions. |
Use Scenario: A utility smart meter logs kWh data to nonvolatile RAM and requires tamper-proof power monitoring during mains interruption. IC Role / Device Role / Timing Role: MAX704TESA monitors main 3.3V rail, asserts RESET on dropout, and uses PFI to detect auxiliary 5V supply failure via resistor divider. Use Value: Enables accurate end-of-interruption timestamping and prevents corrupted billing records through synchronized reset and power-fail interrupt. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TESA | No watchdog timer; no WDI pin; PFI/PFO only; 3.075V reset threshold same | Suitable where only power monitoring and reset are needed - no µP activity supervision required | Select MAX706TESA when watchdog functionality is unnecessary and BOM cost reduction is prioritized |
| MAX803TESA | Single reset output only (no PFO/PFI/WDI/MR); 3.075V threshold; 1.6µA supply current | Targeted at space-constrained designs needing minimal supervision - no auxiliary monitoring or manual reset | Choose MAX803TESA for ultra-low-power, single-function reset-only applications with strict PCB area limits |
Compared with MAX704TESA, MAX706TESA removes watchdog supervision but retains full power-fail monitoring and manual reset, while MAX803TESA reduces feature set to basic reset only - making both alternatives viable when specific MAX704TESA functions are unused in the target design.
Availability
MAX704TESA 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.
Supply support for MAX704TESA 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, computing, and communications markets.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, designed specifically for reliable power-up sequencing, brownout protection, and battery-backed RAM retention in 3.0V/3.3V embedded systems.
FAQ
What is the reset threshold voltage of the MAX704TESA?
The MAX704TESA has a nominal reset threshold voltage of 3.075V, with ±4% tolerance over temperature and supply variations. This value is specified for VCC falling conditions and ensures reset assertion before the 3.3V supply drops below system stability margins. The MAX704TESA datasheet confirms this threshold applies across its 0°C to +70°C operating range and is factory-trimmed for accuracy.
Does the MAX704TESA include a watchdog timer, and how does it operate?
Yes, the MAX704TESA includes a 1.6-second watchdog timer monitored via the WDI pin. The timer clears on any rising or falling edge at WDI and triggers a reset if WDI remains static longer than 1.6s. Unlike some variants, the watchdog function cannot be disabled. This behavior is confirmed in the MAX704TESA datasheet's Watchdog Input section and block diagram.
Can the MAX704TESA support lithium battery backup where VBATT exceeds VCC?
Yes, the MAX704TESA explicitly supports VBATT voltages exceeding VCC - such as a 3.6V lithium cell - without damage. Its battery switchover circuit activates when VCC falls below 2.40V (VSW), connecting VBATT to VOUT. The MAX704TESA datasheet states "Battery Can Exceed VCC in Normal Operation" and specifies VBATT absolute maximum rating as +6.0V.
What is the function of the PFI and PFO pins on the MAX704TESA?
The PFI pin is a dedicated power-fail input with a 1.237V threshold and 10mV hysteresis, used to monitor auxiliary supplies via resistor dividers. When PFI falls below threshold or VCC drops below VSW, the open-drain PFO pin pulls low. This allows flexible power-fail interrupt generation or cascaded reset triggering - fully documented in the MAX704TESA Electrical Characteristics and Applications Information sections.
Is the MAX704TESA pin-compatible with other devices in the MAX70x family?
The MAX704TESA shares identical 8-pin SOIC pinout with MAX706TESA and MAX708TESA, including VOUT, VCC, GND, PFI, PFO, WDI (or MR), RESET, and VBATT assignments. However, functional differences exist: MAX704TESA includes both WDI and MR pins, whereas MAX706TESA replaces WDI with MR, and MAX708TESA omits PFI/PFO. Pin compatibility is confirmed in the MAX704TESA Pin Description table and package outline documentation.
MAX704TESA 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:
- Obsolete
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX704TESA FAQ
1.How can I place an order for MAX704TESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704TESA 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 MAX704TESA reliable?
The price and inventory of MAX704TESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704TESA is usually 5 days.
3.What payment methods are accepted for MAX704TESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704TESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704TESA?
MAX704TESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704TESA 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 MAX704TESA?
For technical support, including MAX704TESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704TESA requirements.
6.How does Aetrix verify that MAX704TESA is sourced from the original manufacturer or authorized distributors?
All MAX704TESA 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 MAX704TESA meets industry standards.
7.What is the process for return or replacement of MAX704TESA?
All MAX704TESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX704TESA, 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 MAX704TESA part is unused and in its original packaging.
Return procedure for MAX704TESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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