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Analog Devices Inc./Maxim Integrated MAX704ESA+T
- Part No.:
- MAX704ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,453
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Product details
Overview
MAX704ESA+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 during main supply failure.
For engineers reviewing the MAX704ESA+T datasheet, MAX704ESA+T pinout, MAX704ESA+T application, or MAX704ESA+T equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1.2V, 200ms reset pulse width, 50nA battery-backup quiescent current, and compatibility with lithium backup batteries (3.0V–3.6V) and supercapacitor sources.
Technical Context
The MAX704ESA+T integrates four core functions: a precision bandgap-based voltage monitor with 4.40V ±2.5% threshold and 40mV hysteresis; a p-channel MOSFET switchover circuit (5Ω on-resistance in VCC mode, 80Ω in VBATT mode); a 1.25V reference comparator for PFI/PFO power-fail signaling; and TTL/CMOS-compatible MR input with internal 250µA pullup.
Its battery-backup mode activates when VCC falls below VRST, disconnecting VCC from VOUT and connecting VBATT (if > VCC + 20mV) through a dedicated 80Ω switch. During this mode, RESET remains low, PFI/PFO are disabled, and total supply current drops to ≤5.0µA across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2.5%; asserts RESET when VCC drops below this level, ensuring deterministic μP initialization at defined supply margin. |
| Reset Pulse Width | 140–280ms (typ. 200ms); guarantees sufficient hold time for μP internal state stabilization after power recovery. |
| Supply Current | 200–500µA (–40°C to +85°C); enables low-power system monitoring without burdening primary supply. |
| Battery-Backup Current | ≤5.0µA (–40°C to +85°C); extends lithium battery life beyond 10 years in standby applications. |
| Power-Fail Threshold | 1.25V ±4%; provides accurate early warning of unregulated supply droop before +5V regulator dropout. |
| VBATT Switch Hysteresis | 40mV; prevents oscillatory switchover during slow VCC decay, ensuring stable RAM power sourcing. |
| Guaranteed RESET Assertion | Down to VCC = 1.2V; maintains valid reset signal even during deep brownout, preventing μP runaway. |
Pinout & Package
MAX704ESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and surface-mount footprint per land pattern 90-0096.
| 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 VCC vs. VRST comparison. |
| 2 (VCC) | Main +5V supply input | Primary power source; monitored for reset generation and used as substrate reference in normal operation. |
| 3 (GND) | Analog/digital ground | Common return for all internal circuits; must be low-impedance to ensure accurate voltage thresholds. |
| 4 (PFI) | Power-fail comparator input | Accepts external voltage divider; triggers PFO low when input falls below 1.25V, enabling pre-brownout interrupt. |
| 5 (PFO) | Power-fail comparator output | Open-drain active-low output; sinks current when PFI < 1.25V; forced low in battery-backup mode. |
| 6 (MR) | Manual reset input | Active-low TTL/CMOS-compatible input with 250µA internal pullup; debounced by 200ms reset timer. |
| 7 (RESET) | μP reset output | Active-low open-drain output; asserted low during VCC undervoltage, MR activation, or brownout recovery delay. |
| 8 (VBATT) | Backup battery input | Accepts 2.8–3.6V lithium cells; powers VOUT and internal logic when VCC < VRST, with automatic switchover control. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset threshold | ±2.5% tolerance over –40°C to +85°C ensures consistent μP reset point across industrial temperature range. |
| 200ms minimum reset pulse width | Guarantees full μP initialization cycle completion, eliminating race conditions during power recovery. |
| 50nA battery-backup quiescent current | Enables >10-year lithium battery life in always-on memory retention applications without periodic replacement. |
| VBATT switchover with 40mV hysteresis | Prevents chattering during marginal VCC conditions, delivering glitch-free RAM power transition. |
| 1.25V power-fail comparator | Allows independent monitoring of unregulated supplies or negative rails via external resistor networks. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Maintaining volatile SRAM contents during AC mains interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory circuit providing battery-backed VOUT and synchronized RESET assertion to prevent program corruption. Use Value: Enables seamless failover to lithium backup without software intervention, meeting IEC 61000-4-29 immunity requirements for sustained operation. | Use Scenario: Preserving calibration data and patient history in portable ultrasound units during battery swap or charging cycles. IC Role / Device Role / Timing Role: Voltage monitor and switchover controller ensuring continuous RAM power and deterministic reset sequencing. Use Value: Guarantees data integrity across power transitions with <5.0µA backup current, extending field service intervals. |
| Automotive Infotainment Head Units | Smart Energy Meters |
Use Scenario: Preventing firmware crash during vehicle ignition cycling where 12V-to-5V conversion causes transient brownouts. IC Role / Device Role / Timing Role: Brownout detector asserting RESET until stable +5V is restored, with manual reset support for factory diagnostics. Use Value: Eliminates boot-loop failures by holding μP in reset for ≥200ms post-brownout, aligning with ISO 16750-2 pulse 4 test profiles. | Use Scenario: Securing tariff and consumption registers during grid outage in ANSI C12.20-certified electricity meters. IC Role / Device Role / Timing Role: Dual-threshold supervisor (4.40V VCC monitor + 1.25V PFI comparator) enabling early warning and controlled shutdown. Use Value: Provides 10ms PFO response time to detect supply sag, allowing microcontroller to store critical data before VCC collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX703ESA+T | 4.65V reset threshold (vs. 4.40V), otherwise identical pinout, timing, and features. | Suitable for +5V systems with tighter tolerance (±5%) where higher reset threshold prevents nuisance resets. | Select MAX703ESA+T when main supply regulation is tighter and brownout margin must exceed 350mV. |
| MAX706ESA+ | No battery backup; adds watchdog timer and CE write-protect; 4.40V reset; same SO-8 package. | Used where RAM backup is unnecessary but firmware integrity monitoring and EEPROM protection are required. | Choose MAX706ESA+ when system requires watchdog timeout supervision and nonvolatile memory write protection alongside reset. |
Compared with MAX704ESA+T, MAX703ESA+T offers higher reset threshold for improved noise immunity in stable +5V rails, while MAX706ESA+ trades battery switching for watchdog and memory protection-making it suitable for cost-sensitive embedded systems without persistent RAM needs.
Availability
MAX704ESA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, automotive infotainment head units, and smart energy meters requiring stable component supply across extended temperature ranges.
Supply support for MAX704ESA+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, communications, and computing applications.
The MAX703/MAX704 product line delivers cost-effective, integrated supervisory solutions for microprocessor systems requiring precise voltage monitoring, battery-backed memory retention, and robust reset generation in harsh environments.
FAQ
What is the guaranteed operating temperature range for MAX704ESA+T?
The MAX704ESA+T is rated for –40°C to +85°C operation, validated across the full range for all electrical specifications including reset threshold accuracy, reset pulse width, and battery-backup current. This E-grade qualification makes MAX704ESA+T suitable for industrial and automotive under-hood applications where ambient temperatures exceed commercial grade limits.
How does the MAX704ESA+T handle battery switchover during slow VCC decay?
The MAX704ESA+T uses a 40mV hysteresis in its battery switchover comparator to prevent oscillation when VCC decays slowly near the 4.40V reset threshold. Once VCC falls below VRST, VBATT connects to VOUT only if VBATT exceeds VCC by >20mV; reconnection to VCC requires VCC to rise >20mV above VBATT, ensuring stable power sourcing without repeated toggling during marginal conditions.
Can the MAX704ESA+T monitor a negative supply voltage?
Yes, the MAX704ESA+T's PFI input can monitor negative supplies using an external resistor network that references PFI to GND. When the negative rail droops, the voltage at PFI rises above 1.25V, causing PFO to go high-an inverted indication usable for fault signaling. Accuracy depends on resistor tolerance and PFI input current (±25nA), not on VCC stability.
What is the maximum allowable backup battery voltage for MAX704ESA+T?
The MAX704ESA+T supports backup batteries up to 4.55V, as specified in Table 2 of the datasheet. Exceeding this voltage risks forward-biasing internal substrate diodes (D1 in Figure 3) when VCC approaches the 4.40V reset threshold, potentially causing unintended current flow and accelerated battery discharge.
Does the MAX704ESA+T require external components for basic reset functionality?
No, the MAX704ESA+T operates as a standalone reset supervisor with no external components required for core functionality. VCC, GND, and RESET connections suffice for power-on reset; MR and PFI/PFO are optional. A 0.1µF bypass capacitor on VCC is recommended for noise immunity, but not mandatory for specification compliance.
MAX704ESA+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:
- 4.4V
- 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
MAX704ESA+T FAQ
1.How can I place an order for MAX704ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704ESA+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 MAX704ESA+T reliable?
The price and inventory of MAX704ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704ESA+T is usually 5 days.
3.What payment methods are accepted for MAX704ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704ESA+T?
MAX704ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704ESA+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 MAX704ESA+T?
For technical support, including MAX704ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704ESA+T requirements.
6.How does Aetrix verify that MAX704ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX704ESA+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 MAX704ESA+T meets industry standards.
7.What is the process for return or replacement of MAX704ESA+T?
All MAX704ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX704ESA+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 MAX704ESA+T part is unused and in its original packaging.
Return procedure for MAX704ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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