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Analog Devices Inc./Maxim Integrated MAX709MCSA+
- Part No.:
- MAX709MCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709MCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,984
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Product details
Overview
MAX709MCSA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3.3V and +5V systems. It asserts RESET when VCC falls below 4.40V (±2.5%), holds reset for ≥140ms after VCC recovers, and operates down to 1.0V supply. Its 8-pin SO package supports industrial temperature range (–40°C to +85°C) and eliminates external components in microprocessor supervisory circuits.
For engineers reviewing the MAX709MCSA+ datasheet, MAX709MCSA+ pinout, MAX709MCSA+ application, or MAX709MCSA+ equivalent, key selection criteria include reset threshold accuracy (4.40V), guaranteed minimum reset timeout (140ms), low quiescent current (65µA typ.), immunity to short VCC transients, and compatibility with bidirectional µP reset pins via series resistor.
Technical Context
The MAX709MCSA+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 4.40V with ±2.5% tolerance over –40°C to +85°C, and the 140ms minimum reset timeout is generated by an on-chip RC network independent of external components.
It features guaranteed RESET validity down to VCC = 1.0V, with open-circuit behavior below that level. The device rejects negative VCC transients ≤40µs at 100mV overdrive and supports safe interfacing to bidirectional µP reset I/O using a 4.7kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2.5% - ensures reliable reset assertion before system logic fails in +3.3V/+5V rails |
| Reset Timeout | ≥140ms - guarantees full µP initialization after power recovery |
| Supply Current | 65µA typ. - enables low-power operation without compromising reset reliability |
| VCC Range | 1.0V to 5.5V - supports valid RESET state down to brownout recovery point |
| Output Type | Open-drain RESET - allows wired-OR configuration and level translation |
| Temp Range | –40°C to +85°C - qualified for industrial embedded and automotive under-hood applications |
| Transient Immunity | ≤40µs @ 100mV overdrive - suppresses false resets from brief supply glitches |
Pinout & Package
MAX709MCSA+ uses an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, body size 4.9mm × 6.0mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect | Internally unconnected - must remain floating or tied to GND per layout best practice |
| 2 | VCC | Main supply input - accepts 1.0V–5.5V; requires 0.1µF bypass capacitor adjacent to pin |
| 3 | GND | Analog/digital ground reference - low-impedance connection critical for noise immunity |
| 7 | RESET | Active-low open-drain output - sinks up to 20mA; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V threshold | Factory-trimmed comparator ensures accurate brownout detection without calibration |
| 140ms min reset timeout | On-chip timing eliminates need for external R/C network and associated board space |
| 1V minimum operating voltage | Guarantees correct RESET state during deep brownout, enabling fail-safe shutdown |
| Immunity to VCC glitches | Rejects transients ≤40µs at 100mV overdrive - prevents spurious resets in noisy environments |
| SO package compatibility | 8-pin SO footprint supports automated assembly and thermal performance up to +85°C ambient |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power cycling during field maintenance or battery backup switchover. IC Role / Device Role / Timing Role: System-level power supervisor asserting hardware reset to prevent corrupted firmware execution. Use Value: 140ms guaranteed reset hold time ensures complete µP register initialization before code fetch begins. | Use Scenario: Dual-rail +5V/+3.3V power sequencing in imaging subsystems with strict boot integrity requirements. IC Role / Device Role / Timing Role: Independent reset generator synchronized to main VCC rail, decoupled from processor's internal reset logic. Use Value: 4.40V threshold precisely matches +3.3V LDO dropout margin, preventing premature release during rail settling. |
| Automotive Body Control Module | Network Edge Router |
Use Scenario: Cold-cranking events causing VCC dip below 4.40V for <100ms. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown and nonvolatile state save. Use Value: Transient immunity (≤40µs @ 100mV overdrive) avoids false resets during engine cranking noise. | Use Scenario: Hot-swap power module insertion causing momentary VCC sag. IC Role / Device Role / Timing Role: Primary reset source for ARM-based SoC, overriding internal POR circuitry. Use Value: Open-drain RESET output enables direct interface to SoC's bidirectional reset pin via 4.7kΩ series resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA+ | Lower reset threshold (2.63V); same 140ms timeout and SO-8 package | Targeted for +2.5V/+3.0V systems, not +3.3V/+5V | Select only if system VCC nominal is ≤3.0V and brownout detection must occur earlier |
| TLV809KDBZR | Fixed 3.08V threshold; 200ms reset timeout; SOT-23-3 package; 0.5µA supply current | Lacks N.C. pins and SO-8 footprint; no transient immunity spec; single-supply optimized | Prefer for ultra-low-power battery-backed systems where board space > timing precision |
Compared with MAX709MCSA+, MAX706RCSA+ shifts reset activation lower (2.63V vs. 4.40V), making it unsuitable for +3.3V rail supervision but viable for 3.0V logic; TLV809KDBZR trades SO-8 robustness and glitch immunity for extreme low power and minimal footprint-requiring redesign of reset net routing and timing validation.
Availability
MAX709MCSA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX709MCSA+ 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, communications, and computing applications.
The MAX709 family delivers cost-effective, single-chip power-supply monitoring for microprocessor-based systems, emphasizing reset accuracy, glitch immunity, and zero-component integration in +3V/+3.3V/+5V environments.
FAQ
What is the exact reset threshold voltage for MAX709MCSA+?
The MAX709MCSA+ has a nominal reset threshold of 4.40V with ±2.5% tolerance over the full –40°C to +85°C temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix M. It ensures reliable assertion before +3.3V system logic becomes unstable.
Does MAX709MCSA+ require external components to function?
No, MAX709MCSA+ requires no external resistors or capacitors for basic reset functionality. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for transient immunity, but the 140ms reset timeout and 4.40V threshold are fully internal. This eliminates BOM count and layout complexity versus discrete supervisor solutions.
Can MAX709MCSA+ drive a microprocessor with a bidirectional reset pin?
Yes, MAX709MCSA+ can interface safely with bidirectional µP reset pins (e.g., Motorola 68HC11) by adding a 4.7kΩ series resistor between its open-drain RESET (pin 7) and the µP pin. This prevents contention when both devices attempt to drive the line, ensuring deterministic logic levels without additional buffers.
What is the minimum VCC voltage at which MAX709MCSA+ guarantees correct RESET state?
MAX709MCSA+ guarantees correct RESET output state down to VCC = 1.0V. Below 1.0V, the RESET pin transitions to high-impedance (open circuit). For applications requiring valid RESET down to 0V, a 100kΩ pull-down resistor on the RESET line is recommended per Maxim's Application Information.
Is MAX709MCSA+ compatible with lead-free PCB assembly processes?
Yes, MAX709MCSA+ is supplied in lead-free packaging compliant with RoHS and JEDEC J-STD-020 moisture sensitivity level (MSL) 1. The "+" suffix explicitly denotes lead-free finish, and the SO package supports standard reflow profiles up to 260°C peak temperature with 10-second duration.
MAX709MCSA+ 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- 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-SOIC
MAX709MCSA+ FAQ
1.How can I place an order for MAX709MCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709MCSA+ 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 MAX709MCSA+ reliable?
The price and inventory of MAX709MCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709MCSA+ is usually 5 days.
3.What payment methods are accepted for MAX709MCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709MCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709MCSA+?
MAX709MCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709MCSA+ 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 MAX709MCSA+?
For technical support, including MAX709MCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709MCSA+ requirements.
6.How does Aetrix verify that MAX709MCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX709MCSA+ 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 MAX709MCSA+ meets industry standards.
7.What is the process for return or replacement of MAX709MCSA+?
All MAX709MCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709MCSA+, 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 MAX709MCSA+ part is unused and in its original packaging.
Return procedure for MAX709MCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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