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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:100
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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 CMOS RAM to VBATT when VCC drops below 2.40V-used in embedded controllers and portable equipment requiring reliable power sequencing.
For engineers reviewing the MAX704TESA+ datasheet, MAX704TESA+ pinout, MAX704TESA+ application, or MAX704TESA+ equivalent, this page delivers verified specifications including reset threshold tolerance (±4%), PFO 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 system validation and BOM consolidation.
Technical Context
The MAX704TESA+ integrates a precision voltage monitor with hysteresis (10mV typical), 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 until VCC exceeds 3.085V (rising) and holds RESET low for ≥200ms after recovery.
It features separate power-fail detection (PFI input referenced to 1.237V ±75mV) independent of reset logic, manual reset input (MR) with 70µA internal pull-up and 200ms deassertion delay, and battery switchover that activates only when VCC falls below VSW (2.40V) *and* VBATT > VCC-or unconditionally below 1.75V-enabling safe use with 3.6V lithium cells exceeding VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC falling) | 3.00V to 3.15V - triggers reset before 3.3V supply drops below system stability margin |
| Reset Timeout Period | 140–280ms - ensures µP reset pulse meets minimum duration requirements across temperature |
| VCC Supply Current | 40µA typ at VCC < 3.6V - enables ultra-low-power operation in battery-backed systems |
| Battery Leakage Current | 0.01–0.5µA - preserves multi-year shelf life of backup lithium cells |
| Watchdog Timeout | 1.12–2.24s - provides robust firmware hang detection without false triggers from transient noise |
| PFO Comparator Accuracy | ±75mV - supports accurate power-fail warning for auxiliary rails using external dividers |
| VBATT Switch Threshold | 2.30–2.50V - initiates battery switchover early enough to maintain CMOS RAM retention (>2.0V) |
Pinout & Package
MAX704TESA+ is housed in an 8-pin SOIC package (SO) with gull-wing leads, RoHS-compliant (indicated by '+' suffix), and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VOUT | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS) based on VCC/VBATT comparison |
| 2: VCC | Main system supply input | Monitored for reset assertion; powers internal circuitry; range: 1.1V to 5.5V |
| 3: GND | Ground reference | Common return for all analog/digital functions; substrate tied to higher of VCC/VBATT |
| 4: PFI | Power-fail input | Compares against 1.237V reference; asserts PFO low if input falls below threshold |
| 5: PFO | Power-fail open-drain output | Signals undervoltage condition; can be wired to MR on MAX704/806 to trigger reset |
| 6: WDI | Watchdog input | Edge-sensitive; clears 1.6s timer on rising/falling transition; cannot be disabled |
| 7: RESET | Active-low reset output | Guaranteed low for VCC < 3.00V; held low ≥200ms after VCC recovery or MR release |
| 8: VBATT | Backup battery input | May exceed VCC; connects to VOUT during brownout; requires 0.1µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, critical for data retention in low-VCC states |
| Battery-backup switchover with 2.40V threshold | Activates before VOUT drops below 2.0V, preserving CMOS RAM contents without external circuitry |
| 200ms reset timeout with temperature stability | Remains within 140–280ms across -40°C to +85°C, meeting µP reset timing requirements |
| 1.6s watchdog timer with edge-triggered clear | Eliminates need for dedicated watchdog IC; immune to static WDI states (no disable option) |
| 40µA VCC supply current (typ) | Reduces standby power in always-on embedded systems, extending battery life in portable designs |
Applications
| Industrial Embedded Controller | Portable Medical Device |
|---|---|
Use Scenario: PLC controller operating on 3.3V rail with lithium coin-cell backup for SRAM retention during mains failure. IC Role / Device Role / Timing Role: Supervises 3.3V supply, asserts RESET on brownout, switches VOUT to VBATT at 2.40V, and monitors auxiliary 5V rail via PFI divider. Use Value: Eliminates discrete reset + battery switchover + watchdog components; guarantees RAM retention >24h on 3.6V/220mAh cell. |
Use Scenario: Handheld glucose meter powered by single AA alkaline cell (1.0–1.6V) with boost converter to 3.3V and CR2032 backup. IC Role / Device Role / Timing Role: Monitors boosted 3.3V rail, triggers watchdog reset if firmware hangs, and maintains SRAM during battery swap. Use Value: Enables hot-swap battery replacement without data loss; 40µA quiescent current extends primary battery life by >15%. |
| Smart Energy Meter | IoT Edge Sensor Node |
Use Scenario: Utility meter with supercapacitor backup, measuring AC line voltage and communicating via NB-IoT. IC Role / Device Role / Timing Role: Detects grid brownout via PFI (divided 230VAC), asserts RESET to halt计量, and switches VOUT to supercap when VCC falls. Use Value: Prevents corrupted kWh readings during voltage sags; 1µA battery current ensures 10-year supercap lifetime. |
Use Scenario: Battery-powered environmental sensor node sampling temperature/humidity every 5 minutes and transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Provides cold-start reset on power-up, watchdog supervision of sleep/wake cycles, and PFO-driven interrupt on low-battery warning. Use Value: Reduces component count by 3 vs. discrete solution; 200ms reset pulse ensures reliable µP initialization after wake-up. |
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; identical reset threshold and battery switchover | Suitable where firmware reliability is ensured externally; lower cost for non-watchdog use cases | Select MAX706TESA+ if watchdog functionality is unnecessary and BOM simplification is prioritized |
| MAX803TESA+ | Single-function reset supervisor (no PFI/PFO, no WDI, no battery switchover); 3.075V threshold; 1.6µA supply current | Targeted at cost-sensitive, space-constrained applications needing only basic reset generation | Choose MAX803TESA+ for minimal footprint and ultra-low power where battery backup and watchdog are omitted |
Compared with MAX704TESA+, MAX706TESA+ removes watchdog capability but retains identical reset timing and battery management-ideal for deterministic firmware environments-while MAX803TESA+ sacrifices all ancillary functions for lowest possible quiescent current and smallest footprint, making it suitable only for basic reset-only roles.
Availability
MAX704TESA+ is available at Aetrix Electronics and suitable for industrial embedded controllers, portable medical devices, smart energy meters, and IoT edge sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for 3.0V/3.3V systems requiring integrated reset generation, battery backup switchover, watchdog monitoring, and power-fail detection in a single 8-pin SOIC package.
FAQ
What is the guaranteed reset assertion voltage range for MAX704TESA+?
The MAX704TESA+ guarantees RESET assertion for VCC from 0V up to 3.00V (falling), and remains asserted until VCC rises above 3.085V (rising). It also guarantees valid RESET output down to VCC = 1V-even with no backup battery-ensuring fail-safe behavior during deep brownout conditions critical for data integrity in embedded systems using MAX704TESA+.
Can MAX704TESA+ be used without a backup battery?
Yes, MAX704TESA+ can operate without a backup battery: connect both VBATT and VOUT pins directly to VCC. However, battery switchover and RAM backup functionality will be disabled. For pure reset-only applications without backup needs, consider the lower-cost MAX706TESA+ or MAX803TESA+-but MAX704TESA+ remains fully functional as a supervisory IC in non-battery configurations.
How does the watchdog timer in MAX704TESA+ respond to WDI signal transitions?
The MAX704TESA+ watchdog timer is cleared on *any* edge (rising or falling) at the WDI pin and times out after 1.6 seconds if no transition occurs. Unlike some supervisors, the watchdog cannot be disabled-ensuring continuous firmware health monitoring. If WDI is held static, MAX704TESA+ asserts RESET every ~1.8 seconds (tWD + tRS), making MAX704TESA+ ideal for systems requiring mandatory periodic firmware "kick" verification.
What is the maximum allowable voltage on the VBATT pin of MAX704TESA+?
The absolute maximum rating for VBATT on MAX704TESA+ is +6.0V with respect to GND. In normal operation, VBATT may safely exceed VCC (e.g., 3.6V lithium cell with 3.3V system rail), enabling seamless switchover. However, sustained VBATT > 5.5V risks exceeding internal junction limits-designers should ensure VBATT stays within 3.0V–4.2V for standard lithium chemistry and include 0.1µF local decoupling per MAX704TESA+ datasheet recommendations.
Does MAX704TESA+ support interfacing with µPs having bidirectional reset pins?
Yes, MAX704TESA+ supports bidirectional reset pins (e.g., Motorola 68HC11) via a 4.7kΩ series resistor between RESET and the µP I/O pin. This prevents contention when the µP drives reset low while MAX704TESA+ drives high. The resistor isolates logic levels without affecting timing, and buffered RESET outputs can drive other system components-ensuring robust interoperability in mixed-architecture designs using MAX704TESA+.
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:
- 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+ 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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