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Analog Devices Inc./Maxim Integrated MAX709LCUA+
- Part No.:
- MAX709LCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX709LCUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
MAX709LCUA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V systems requiring 4.65V reset threshold, 140ms minimum reset timeout, and operation down to 1V VCC. It eliminates external components in microprocessor supervisory circuits and supports 8-pin µMAX packaging for space-constrained embedded designs.
For engineers reviewing the MAX709LCUA+ datasheet, MAX709LCUA+ pinout, MAX709LCUA+ application, or MAX709LCUA+ equivalent, key selection criteria include reset threshold accuracy (±150mV), temperature-stable delay timing, immunity to sub-40µs negative VCC transients, and compatibility with bidirectional µP reset I/O via series resistor buffering.
Technical Context
The MAX709LCUA+ integrates a precision voltage comparator with hysteresis and a monostable timer to generate a guaranteed 140ms–560ms active-low RESET pulse after VCC rises above 4.65V (±150mV). Its internal reference is trimmed at wafer level for stability across -40°C to +85°C.
It operates with supply current as low as 35µA (TYP) at 3.6V and remains functional down to VCC = 1.0V, where RESET output transitions to high-impedance-requiring external pull-down only if validity below 1V is needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion before +5V system brownout affects logic integrity |
| Power-On Reset Delay | 140ms min - holds µP in reset long enough for clock stabilization and memory initialization |
| VCC Operating Range | 1.0V to 5.5V - enables valid RESET state monitoring even during deep brownout or partial power loss |
| Supply Current | 65µA max (TYP 35µA) - minimizes standby power impact in battery-backed or energy-sensitive systems |
| RESET Output Sink | 20mA max - drives standard CMOS/TTL inputs directly without external buffer |
| Transient Immunity | Immune to ≤40µs negative VCC glitches ≥100mV below threshold - suppresses false resets from noise or coupling |
| Package | 8-pin µMAX (3mm × 3mm) - surface-mount footprint compatible with automated assembly and high-density PCB layouts |
Pinout & Package
MAX709LCUA+ uses an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin 1 is top-left corner (dot-marked), pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect (N.C.) | Internally unconnected - must be left floating or tied to GND per layout best practice; no electrical function |
| 2 | VCC | Main supply input - accepts 1.0V–5.5V; requires 0.1µF bypass capacitor placed adjacent to pin |
| 3 | GND | Analog/digital ground reference - connects to system ground plane with low-inductance path |
| 7 | RESET | Active-low open-drain reset output - sinks up to 20mA; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V threshold | Guaranteed ±150mV tolerance over full temperature range ensures deterministic reset timing in +5V systems |
| 140ms minimum reset timeout | Monostable circuit enforces sufficient hold time for µP core, PLL, and memory initialization sequences |
| Operation down to 1V VCC | RESET remains valid and actively driven until VCC drops below 1V - critical for graceful shutdown detection |
| No external components required | Integrated reference, comparator, and timer eliminate discrete resistors, capacitors, and comparators in basic supervision |
| Immunity to short VCC transients | Rejects ≤40µs negative glitches ≥100mV below threshold - prevents spurious resets from switching noise |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Power cycling during field firmware updates in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: System-level power supervisor asserting active-low RESET to ARM Cortex-M7 during VCC ramp-up and brownout. Use Value: 140ms guaranteed reset hold ensures complete cache flush and register save before processor restart. | Use Scenario: Battery-backed operation with automatic reset on Li-ion voltage sag below 4.65V. IC Role / Device Role / Timing Role: Primary brownout detector interfacing to low-power MSP430F5xx MCU via 4.7kΩ series resistor. Use Value: 4.65V threshold aligns with battery end-of-discharge voltage, preventing corrupted EEPROM writes. |
| Automotive Body Control Module | Point-of-Sale Terminal |
Use Scenario: Cold-cranking event where 12V supply dips to 5.2V for <100ms. IC Role / Device Role / Timing Role: Supervisory guard for Infineon AURIX TC275, asserting RESET only when VCC falls below 4.65V for >20µs. Use Value: Transient immunity prevents false resets during engine start, while 1V operation detects true undervoltage failure. | Use Scenario: AC/DC adapter dropout during thermal shutdown of switching regulator. IC Role / Device Role / Timing Role: Standalone reset generator for NXP i.MX6UL, driving external reset buffer for DDR3 and PMIC sequencing. Use Value: Eliminates need for RC network and Schmitt trigger, reducing BOM count and board area by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706PESA+ | Same 4.65V threshold, but SO-8 package (4.9mm × 6.0mm) and -40°C to +85°C temp range | Requires PCB layout change due to larger footprint and different thermal pad configuration | Select when extended temperature range or SO-8 reflow compatibility is required over µMAX size constraints |
| TPS3808G33DBVR | TI part with 3.3V threshold (not 4.65V); 200ms fixed delay; 1.8V–6.0V VCC range | Not a direct functional match - intended for 3.3V systems, not +5V brownout supervision | Consider only if redesigning for 3.3V rail supervision and accepting different reset timing behavior |
Compared with MAX709LCUA+, MAX706PESA+ offers identical reset functionality in a larger SO-8 package with extended temperature rating, while TPS3808G33DBVR serves a different voltage domain and cannot substitute without system-level voltage rail changes.
Availability
MAX709LCUA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and point-of-sale terminals requiring stable component supply and long-term production continuity.
Supply support for MAX709LCUA+ 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 industrial, automotive, and communications applications.
The MAX709 family delivers single-chip power-supply supervision for microprocessor-based systems, targeting cost-sensitive, space-constrained designs needing reliable reset generation without external components.
FAQ
What is the exact reset threshold voltage of the MAX709LCUA+?
The MAX709LCUA+ has a nominal reset threshold of 4.65V, with guaranteed limits of 4.50V (min) and 4.75V (max) over the full operating temperature range. This threshold is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix 'L'. The value ensures deterministic reset assertion before +5V system logic becomes unreliable.
Does the MAX709LCUA+ require external components to function?
No, the MAX709LCUA+ requires no external resistors or capacitors to perform basic power-on and brownout reset functions. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for transient immunity but is not strictly required for DC operation. All timing, reference, and comparator functions are integrated internally.
Can the MAX709LCUA+ drive a microprocessor reset pin directly?
Yes, the MAX709LCUA+ RESET output (pin 7) is an open-drain driver capable of sinking up to 20mA, sufficient to assert reset on most CMOS and TTL microprocessors. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor between MAX709LCUA+ RESET and the µP pin is required to prevent contention.
What is the minimum VCC voltage at which the MAX709LCUA+ guarantees RESET output state?
The MAX709LCUA+ guarantees correct RESET output state (active-low when asserted, high-impedance when released) down to VCC = 1.0V. Below 1.0V, the RESET pin becomes high-impedance and may float; a pull-down resistor is recommended only if valid logic-low state is required all the way to 0V.
Is the MAX709LCUA+ pin-compatible with other MAX709 variants?
Yes, all MAX709 variants-including MAX709LCUA+, MAX709M, MAX709R, etc.-share identical 8-pin µMAX pinout and terminal functions. Only the reset threshold voltage differs by suffix (L = 4.65V, M = 4.40V, R = 2.63V, etc.). No PCB layout change is needed when substituting within the same package type.
MAX709LCUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- 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-uMAX/uSOP
MAX709LCUA+ FAQ
1.How can I place an order for MAX709LCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LCUA+ 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 MAX709LCUA+ reliable?
The price and inventory of MAX709LCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LCUA+ is usually 5 days.
3.What payment methods are accepted for MAX709LCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LCUA+?
MAX709LCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LCUA+ 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 MAX709LCUA+?
For technical support, including MAX709LCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LCUA+ requirements.
6.How does Aetrix verify that MAX709LCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX709LCUA+ 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 MAX709LCUA+ meets industry standards.
7.What is the process for return or replacement of MAX709LCUA+?
All MAX709LCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LCUA+, 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 MAX709LCUA+ part is unused and in its original packaging.
Return procedure for MAX709LCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX709LCUA+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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MCP130T-315I/TT
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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