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Analog Devices Inc./Maxim Integrated MAX704TESA+T
- Part No.:
- MAX704TESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704TESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,001
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Product details
Overview
MAX704TESA+T 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-enabling reliable CMOS RAM retention in portable controllers.
For engineers reviewing the MAX704TESA+T datasheet, MAX704TESA+T pinout, MAX704TESA+T application, or MAX704TESA+T equivalent, this page delivers verified specifications including reset threshold tolerance (±4%), PFI comparator accuracy (±75mV), VCC supply current (40µA typ), battery leakage (0.4–1µA), and guaranteed RESET assertion down to VCC = 1V-critical for low-voltage embedded system reliability validation.
Technical Context
The MAX704TESA+T integrates a precision reset comparator with 10mV hysteresis, a non-disableable 1.6s watchdog timer cleared by WDI edges, and a dual-path power switch: VCC-to-VOUT via 3Ω PMOS and VBATT-to-VOUT via 140Ω NMOS. Its reset generator guarantees monotonic assertion during VCC ramp-down and holds RESET low for 200ms after VCC recovery or MR release.
It features a dedicated PFI input referenced to 1.237V ±75mV, independent of reset logic, enabling external supply monitoring; a manual reset input (MR) with 70µA internal pull-up; and battery switchover that activates only when VCC < VSW (2.40V) and VBATT > VCC-or when VCC drops below 1.75V-preventing premature battery drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (VCC falling), ±4% tolerance - ensures reset triggers before 3.3V supply drops below 3.0V system margin. |
| Reset Timeout Period | 200ms (typ), 140–280ms over temperature - provides sufficient hold time for µP initialization and clock stabilization. |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables ultra-low-power operation in battery-backed portable systems. |
| Battery Supply Current | 0.4–1µA (max, -40°C to +85°C) - minimizes backup battery depletion during extended standby. |
| Watchdog Timeout | 1.6s (typ), 1.12–2.24s over temperature - detects µP lockup without requiring software intervention. |
| Power-Fail Threshold | 1.237V ±75mV - supports accurate undervoltage detection on auxiliary rails via external resistor divider. |
| VBATT Switch Threshold | VSW = 2.40V (rising), 65mV hysteresis - initiates battery switchover early enough to preserve RAM data above 2.0V minimum. |
Pinout & Package
MAX704TESA+T is housed in an 8-pin SOIC package (SO, 150mil width), RoHS-compliant (indicated by '+' suffix), with standard JEDEC MS-012AC outline and thermal pad not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Supply output for CMOS RAM | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS); must be decoupled with 0.1µF capacitor. |
| VCC | Main supply input | Operates from 3.02V to 5.5V; powers internal circuitry and drives VOUT when active; absolute max = +6.0V. |
| GND | Ground reference | Common return for all analog/digital functions; substrate tied to higher of VCC/VBATT-must be floated in hybrid designs. |
| PFI | Power-fail input | Compares against 1.237V reference; asserts PFO low when voltage drops below threshold-used for auxiliary rail monitoring. |
| PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage or VCC < VSW; can be wired to MR on MAX704/806 to trigger reset. |
| WDI | Watchdog input | Edge-sensitive (rising/falling); clears 1.6s timer on transition; tied high/low causes periodic reset-no disable option. |
| RESET | Active-low reset output | Push-pull, guaranteed low for VCC < 3.075V and 200ms post-recovery; sinks 1.2mA at 0.3V max VOL. |
| VBATT | Backup-battery input | Accepts up to 6.0V; may exceed VCC; connects to VOUT during brownout-enables lithium cell (3.6V) use without regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout-critical for systems with unregulated or aging supplies. |
| Battery switchover with 2.40V VSW threshold | Activates backup before VOUT drops below 2.0V RAM retention limit-extends data hold time without oversizing battery. |
| 40µA VCC supply current (typ) | Reduces quiescent load on primary supply-enables multi-year operation on coin cells in maintenance-free instruments. |
| 1µA max battery leakage current | Preserves shelf life of lithium backup batteries-supports >10-year storage without capacity loss. |
| 1.237V ±75mV PFI comparator | Enables precise monitoring of secondary rails (e.g., 5V, 12V) using standard resistor dividers-no external reference needed. |
Applications
| Battery-Powered Portable Controllers | Embedded Industrial Data Loggers |
|---|---|
Use Scenario: Handheld test equipment powered by single 3.3V Li-ion cell with optional coin-cell backup for SRAM retention during charging cycles. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and automatic battery switchover to maintain real-time clock and configuration memory. Use Value: Eliminates need for discrete reset generator + backup diode + voltage monitor-reducing BOM count by 4 components and PCB area by 25mm². |
Use Scenario: Remote environmental sensor node operating on solar-charged battery, logging data to SPI FRAM with periodic wake-up. IC Role / Device Role / Timing Role: System supervisor asserting reset on supply dip, triggering watchdog reset on firmware hang, and enabling seamless RAM backup during dusk/dawn voltage sag. Use Value: 200ms reset timeout aligns with µP boot sequence; 1.6s watchdog prevents missed wake-ups; 40µA quiescent current extends field deployment to 3+ years. |
| Critical µP Power Monitoring in Medical Devices | Intelligent Instrumentation with Dual-Rail Monitoring |
Use Scenario: Portable ECG monitor with isolated 3.3V digital domain and 5V analog front-end, requiring fail-safe reset on either rail collapse. IC Role / Device Role / Timing Role: Primary VCC supervisor with PFI configured to monitor 5V analog supply via resistor divider-asserting PFO to trigger system shutdown. Use Value: ±75mV PFI threshold accuracy ensures detection of 5V rail drop to 4.85V-meeting IEC 60601-1 fault response timing requirements. |
Use Scenario: Bench multimeter with microcontroller, LCD driver, and isolated communication interface-each powered from separate LDOs. IC Role / Device Role / Timing Role: Central supervisory hub using PFI to monitor 12V supply for relay drivers and RESET to coordinate cold start across subsystems. Use Value: Independent PFI comparator allows simultaneous monitoring of three rails without additional ICs; MR input enables front-panel hard reset without firmware involvement. |
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; 40µA supply current. | Suitable for simpler systems where µP lockup detection is handled in firmware or omitted. | Select MAX706TESA+ when watchdog functionality is unnecessary and cost reduction is prioritized. |
| MAX803TESA+ | Same 3.075V reset threshold and 200ms timeout, but no battery switchover (no VBATT/VOUT pins); no PFI/PFO; no WDI. | Designed for basic reset-only applications without backup power or auxiliary monitoring needs. | Choose MAX803TESA+ for minimal footprint (same SO-8) in non-battery-backed µP systems with single-rail monitoring. |
Compared with MAX704TESA+T, MAX706TESA+ trades watchdog capability for lower complexity and cost, while MAX803TESA+ eliminates all advanced features-offering only core reset generation-making it suitable for cost-sensitive, non-backup applications where system-level supervision is otherwise implemented.
Availability
MAX704TESA+T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded industrial data loggers, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX704TESA+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, automotive, and computing markets.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, designed specifically for reliable power monitoring and system reset control in 3.0V/3.3V embedded systems with battery backup requirements.
FAQ
What is the guaranteed minimum VCC voltage at which MAX704TESA+T asserts RESET?
MAX704TESA+T guarantees RESET assertion for VCC down to 1V, regardless of VBATT status. This ensures fail-safe reset behavior during severe brownout conditions where the main supply collapses below nominal operating range-critical for preserving system state in portable medical or instrumentation devices using MAX704TESA+T.
Does MAX704TESA+T support disabling the watchdog timer?
No, the watchdog timer in MAX704TESA+T cannot be disabled-it is always active and triggered by WDI remaining static for 1.6 seconds. The timer resets on any edge (rising or falling) at WDI. This design ensures continuous µP health monitoring, making MAX704TESA+T appropriate for safety-critical applications where firmware-based watchdog control is insufficient.
How does the battery switchover function work in MAX704TESA+T?
In MAX704TESA+T, VOUT automatically switches from VCC to VBATT when VCC falls below 2.40V (VSW) and VBATT exceeds VCC-or when VCC drops below 1.75V regardless of VBATT. Switchover back to VCC occurs only after VCC rises above the 3.075V reset threshold, ensuring stable supply reconnection. This behavior is implemented via internal 3Ω and 140Ω MOSFET switches.
Can MAX704TESA+T monitor a 5V auxiliary supply?
Yes, MAX704TESA+T can monitor a 5V auxiliary supply using its PFI input with an external resistor divider. The PFI comparator has a fixed 1.237V ±75mV threshold, so a 5V rail requires a 1:4 divider (e.g., 30kΩ/10kΩ) to scale it to 1.25V. PFO then signals undervoltage, and can be connected to MR to generate a system reset-enabling dual-rail supervision with MAX704TESA+T.
What is the maximum allowable voltage on the VBATT pin of MAX704TESA+T?
The absolute maximum rating for VBATT on MAX704TESA+T is +6.0V with respect to GND. This allows direct connection of common 3.6V lithium coin cells or charged supercapacitors without external regulation. However, VBATT must be decoupled with a 0.1µF capacitor, and short-circuit protection is not provided-so external fusing or current limiting is recommended for systems where VBATT may be inadvertently shorted.
MAX704TESA+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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX704TESA+T FAQ
1.How can I place an order for MAX704TESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704TESA+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 MAX704TESA+T reliable?
The price and inventory of MAX704TESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704TESA+T is usually 5 days.
3.What payment methods are accepted for MAX704TESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704TESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704TESA+T?
MAX704TESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704TESA+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 MAX704TESA+T?
For technical support, including MAX704TESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704TESA+T requirements.
6.How does Aetrix verify that MAX704TESA+T is sourced from the original manufacturer or authorized distributors?
All MAX704TESA+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 MAX704TESA+T meets industry standards.
7.What is the process for return or replacement of MAX704TESA+T?
All MAX704TESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX704TESA+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 MAX704TESA+T part is unused and in its original packaging.
Return procedure for MAX704TESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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