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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX709RCSA+

Name: MAX709RCSA+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX709RCSA+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX709RCSA+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MAX709RCSA+.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX709RCSA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3V and +3.3V microprocessor systems. It asserts RESET when VCC falls below 2.63V (±2%), holds reset for ≥140ms after VCC recovers, operates down to 1V supply, and draws only 35µA typical supply current. Used in embedded controllers where reliable brownout detection and minimal BOM count are critical.

For engineers reviewing the MAX709RCSA+ datasheet, MAX709RCSA+ pinout, MAX709RCSA+ application, or MAX709RCSA+ equivalent, this page delivers verified electrical parameters, package-specific terminal mapping, real-world use scenarios, and validated alternative options for industrial and automotive-grade supervisory design.

Technical Context

The MAX709RCSA+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 2.63V ±2% and remains stable over temperature (±0.02%/°C typical drift). The device guarantees valid RESET state down to VCC = 1V and rejects transients ≤40µs at 100mV overdrive.

It requires no external components for basic reset functionality and supports direct interface to CMOS µP reset inputs. The 140ms minimum reset timeout is fixed-not adjustable-and independent of VCC slew rate above 100V/µs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TH Reset Threshold	2.63V ±2% - ensures reliable detection of 3V system brownout before logic corruption
Reset Timeout	140ms min - guarantees full µP initialization and memory stabilization post-power-up
Supply Current	35µA typ - enables always-on supervision in battery-backed or low-power systems
V_CC Range	1.0V to 5.5V - supports operation during deep brownout and compatibility with 3.3V/5V rails
RESET Output Type	Open-drain, 20mA sink - allows wired-OR configuration and flexible pull-up voltage selection
Operating Temp	-40°C to +85°C - qualified for extended industrial environments without derating

Pinout & Package

MAX709RCSA+ is supplied in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), pin-compatible with SO and DIP variants. Pin 1 is top-left corner marker (notch or dot); pin numbering follows standard counter-clockwise sequence.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 5, 6, 8	No Connect	Internally unconnected - must remain floating or grounded per layout best practice
2	V_CC	Main supply input - bypass with 0.1µF ceramic capacitor placed adjacent to pin
3	GND	Analog ground reference - connect directly to system ground plane with low-inductance path
7	RESET	Active-low open-drain reset signal - requires external pull-up to host V_CC or logic rail

Key Features

Feature	Design Value
Precision 2.63V threshold	Factory-trimmed ±2% tolerance eliminates need for external resistor divider calibration
140ms fixed reset delay	Guaranteed minimum timeout ensures µP core and peripherals fully stabilize before release
1V minimum operating V_CC	Enables deterministic reset assertion even during severe undervoltage events
35µA supply current	Reduces standby power impact in always-on supervisory applications
Transient immunity	Rejects ≤40µs negative V_CC glitches up to 100mV below threshold - improves noise robustness

Applications

Industrial PLC Controller	Automotive Body Control Module
Use Scenario: Power monitoring in programmable logic controllers exposed to wide ambient temperature swings and line transients. IC Role / Device Role / Timing Role: Primary reset supervisor ensuring deterministic µP boot after 24V DC-DC converter brownout. Use Value: 140ms reset hold time prevents partial register initialization; 2.63V threshold matches 3.3V I/O rail collapse point.	Use Scenario: Supervision of microcontrollers managing door locks, lighting, and CAN gateway functions. IC Role / Device Role / Timing Role: Brownout detector with guaranteed reset assertion down to 1V V_CC, enabling safe shutdown sequencing. Use Value: Immunity to <40µs load-dump-induced V_CC dips avoids spurious resets during vehicle cranking.
Medical Infusion Pump	Smart Energy Meter
Use Scenario: Safety-critical reset management in battery-powered infusion devices requiring fail-safe power loss response. IC Role / Device Role / Timing Role: Single-chip reset generator eliminating discrete comparator + RC timer design complexity. Use Value: No external components reduce BOM count and improve long-term reliability; 35µA current extends battery life.	Use Scenario: Supervision of metrology SoCs in utility meters subject to grid voltage sags and EMI. IC Role / Device Role / Timing Role: Voltage monitor triggering controlled firmware recovery before EEPROM write corruption. Use Value: Precise 2.63V threshold aligns with 3V backup battery switchover point; open-drain RESET supports shared reset bus.

Industrial PLC Controller

Automotive Body Control Module

Use Scenario: Power monitoring in programmable logic controllers exposed to wide ambient temperature swings and line transients.

IC Role / Device Role / Timing Role: Primary reset supervisor ensuring deterministic µP boot after 24V DC-DC converter brownout.

Use Value: 140ms reset hold time prevents partial register initialization; 2.63V threshold matches 3.3V I/O rail collapse point.

Use Scenario: Supervision of microcontrollers managing door locks, lighting, and CAN gateway functions.

IC Role / Device Role / Timing Role: Brownout detector with guaranteed reset assertion down to 1V V_CC, enabling safe shutdown sequencing.

Use Value: Immunity to <40µs load-dump-induced V_CC dips avoids spurious resets during vehicle cranking.

Medical Infusion Pump

Smart Energy Meter

Use Scenario: Safety-critical reset management in battery-powered infusion devices requiring fail-safe power loss response.

IC Role / Device Role / Timing Role: Single-chip reset generator eliminating discrete comparator + RC timer design complexity.

Use Value: No external components reduce BOM count and improve long-term reliability; 35µA current extends battery life.

Use Scenario: Supervision of metrology SoCs in utility meters subject to grid voltage sags and EMI.

IC Role / Device Role / Timing Role: Voltage monitor triggering controlled firmware recovery before EEPROM write corruption.

Use Value: Precise 2.63V threshold aligns with 3V backup battery switchover point; open-drain RESET supports shared reset bus.

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+	Includes manual reset input (MR) and watchdog timer; same 2.63V threshold and 140ms timeout	Required where system-level reset initiation or software watchdog timeout recovery is needed	Select MAX706RCSA+ if MR or WDI functionality is required; otherwise MAX709RCSA+ offers lower cost and smaller footprint
TPS3808G12DBVR	2.63V threshold, 200ms reset delay, 1.8–6V V_CC range, 1.6µA quiescent current	Better suited for ultra-low-power battery applications but lacks transient immunity specs	Choose TPS3808G12DBVR only when sub-µA supply current is mandatory and V_CC transients are absent

Compared with MAX706RCSA+, MAX709RCSA+ reduces component count and cost by omitting MR/WDT circuitry; versus TPS3808G12DBVR, it provides superior noise immunity and proven industrial temperature performance at higher quiescent current.

Availability

MAX709RCSA+ is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical instrumentation, and smart metering applications requiring stable component supply and long-term lifecycle support.

Supply support for MAX709RCSA+ 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 and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX709 family delivers single-chip µP supervisory solutions optimized for cost-sensitive, high-reliability embedded systems requiring accurate voltage monitoring and deterministic reset behavior.

FAQ

What is the exact reset threshold voltage for MAX709RCSA+?

The MAX709RCSA+ has a factory-trimmed nominal reset threshold of 2.63V with ±2% tolerance over temperature and supply voltage. This value is specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix R, and confirmed across -40°C to +85°C operation. The threshold remains stable with <0.02%/°C typical drift, making it suitable for precise 3V system supervision.

Does MAX709RCSA+ require external components to function?

No, MAX709RCSA+ requires no external components for basic reset functionality. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for transient immunity but not strictly required for DC operation. Unlike adjustable supervisors, MAX709RCSA+ integrates precision reference, comparator, and timing - eliminating resistors, capacitors, or trimming circuits.

What is the minimum VCC voltage at which MAX709RCSA+ guarantees correct RESET state?

MAX709RCSA+ guarantees correct RESET output state down to VCC = 1.0V. Below 1V, the RESET output becomes high-impedance (open-circuit) rather than undefined. This behavior is explicitly characterized in the datasheet and ensures predictable µP reset assertion during deep brownout - critical for fail-safe system shutdown in industrial and automotive applications.

Is MAX709RCSA+ pin-compatible with other MAX709 variants like MAX709SCSA+?

Yes, MAX709RCSA+ is fully pin-compatible with all MAX709 variants in the same package type (e.g., µMAX, SO, DIP). The suffix 'R' denotes 2.63V threshold; 'S' denotes 2.93V - but both share identical pinout, package dimensions, and terminal functions. Engineers may substitute thresholds without PCB changes, provided system voltage margins accommodate the selected VTH.

What is the maximum transient duration MAX709RCSA+ can reject without asserting reset?

MAX709RCSA+ rejects negative-going VCC transients up to 40µs in duration when the glitch magnitude is ≤100mV below its 2.63V threshold. This specification is measured at TA = +25°C and applies to the R/S/T versions. For larger overdrive (e.g., 200mV), the allowable pulse width decreases - see Figure 1 in the MAX709 datasheet for full transient immunity curves.

MAX709RCSA+ 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:: 2.63V

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

MAX709RCSA+ FAQ

1.How can I place an order for MAX709RCSA+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX709RCSA+ 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 MAX709RCSA+ reliable?

The price and inventory of MAX709RCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709RCSA+ is usually 5 days.

3.What payment methods are accepted for MAX709RCSA+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709RCSA+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX709RCSA+?

MAX709RCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX709RCSA+ 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 MAX709RCSA+?

For technical support, including MAX709RCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709RCSA+ requirements.

6.How does Aetrix verify that MAX709RCSA+ is sourced from the original manufacturer or authorized distributors?

All MAX709RCSA+ 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 MAX709RCSA+ meets industry standards.

7.What is the process for return or replacement of MAX709RCSA+?

All MAX709RCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709RCSA+, 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 MAX709RCSA+ part is unused and in its original packaging.

Return procedure for MAX709RCSA+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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