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

Analog Devices Inc./Maxim Integrated MAX709RESA+

Name: MAX709RESA+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX709RESA+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX709RESA+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

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

Datasheet:: MAX709RESA+.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX709RESA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V/+3.3V/+3V systems. It asserts RESET when VCC falls below 2.63V (±2%), holds reset for ≥140ms after VCC recovers, and guarantees valid output down to VCC = 1V. Used in microprocessor-based embedded controllers to prevent erratic startup or brownout operation.

For engineers reviewing the MAX709RESA+ datasheet, MAX709RESA+ pinout, MAX709RESA+ application, or MAX709RESA+ equivalent, key selection criteria include reset threshold accuracy (2.63V), guaranteed minimum reset timeout (140ms), low quiescent current (35µA), immunity to short VCC transients, and compatibility with SO-8 packaging for space-constrained designs.

Technical Context

The MAX709RESA+ integrates a precision voltage comparator, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 2.63V with ±2% tolerance over –40°C to +85°C, and its 140ms reset timeout is temperature-stable across the full operating range.

It features built-in immunity to negative VCC transients ≤40µs at 100mV overdrive, requires no external components for basic reset functionality, and maintains RESET validity during VCC ramp-up/down without external pull-ups-enabling direct interface to µP reset inputs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TH Reset Threshold	2.63V ±2% - ensures reliable reset assertion before critical logic voltage margin is violated in 3V/3.3V systems
Reset Timeout	140ms min - guarantees sufficient hold time for µP initialization and peripheral stabilization
Supply Current	35µA typ - enables ultra-low-power operation in battery-backed or energy-sensitive applications
V_CC Range	1.0V to 5.5V - supports operation during deep brownout and ensures RESET state integrity down to 1V
RESET Output Type	Open-drain, 20mA sink - allows wired-OR configuration and flexible voltage-level translation
Operating Temp	–40°C to +85°C - qualified for industrial-grade embedded and automotive under-hood auxiliary systems
Package	8-pin SO - surface-mount compatible with standard reflow profiles and IPC-compliant board assembly

Pinout & Package

MAX709RESA+ is supplied in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 5, 6, 8	No Connect	Internally unconnected; must be left floating or tied to GND per layout best practice
2	V_CC	Positive supply input - accepts 1.0V–5.5V; bypass capacitor required at pin for transient immunity
3	GND	Analog ground reference - shared return path for internal comparator and output stage
7	RESET	Active-low open-drain reset output - sinks current during fault; requires external pull-up for logic-high level

Key Features

Feature	Design Value
Precision 2.63V threshold	Factory-trimmed ±2% tolerance ensures consistent reset point across temperature and unit-to-unit variation
140ms min reset timeout	Guaranteed minimum delay eliminates need for external RC timing networks in most µP boot sequences
No external components required	Self-contained reset generation reduces BOM count, PCB area, and qualification effort for cost-sensitive designs
Immunity to V_CC glitches	Rejects transients ≤40µs at 100mV overdrive - prevents spurious resets during noisy power rail conditions
Valid RESET down to V_CC = 1V	Ensures deterministic reset state during slow power ramps or partial brownouts where other monitors fail

Applications

Industrial PLC Controllers	Medical Diagnostic Handhelds
Use Scenario: Power cycling during field firmware updates in programmable logic controllers with isolated I/O modules. IC Role / Device Role / Timing Role: System-level power supervisor that asserts hardware reset before VCC drops below 2.63V and holds it ≥140ms post-recovery. Use Value: Prevents corrupted register states and I/O misconfiguration during partial power loss, ensuring deterministic restart behavior.	Use Scenario: Battery-powered portable ultrasound units requiring reliable cold-start and brownout recovery. IC Role / Device Role / Timing Role: Low-current (35µA) reset generator maintaining supervision during standby and enabling fast wake-from-reset sequencing. Use Value: Extends battery life while guaranteeing µP reset integrity even as Li-ion voltage decays from 4.2V to 2.8V.
Automotive Body Control Modules	Smart Energy Meters
Use Scenario: Engine compartment electronics exposed to load-dump transients and wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-temperature (–40°C to +85°C) reset monitor immune to sub-50µs VCC glitches on 12V-regulated rails. Use Value: Eliminates false resets caused by alternator ripple or relay switching noise, improving system uptime.	Use Scenario: Revenue-grade electricity meters with tamper detection and secure boot requirements. IC Role / Device Role / Timing Role: Primary reset source ensuring secure bootloader execution only after stable 3.3V rail is confirmed above 2.63V. Use Value: Enforces cryptographic key loading and firmware validation sequence integrity during power-on initialization.

Industrial PLC Controllers

Medical Diagnostic Handhelds

Use Scenario: Power cycling during field firmware updates in programmable logic controllers with isolated I/O modules.

IC Role / Device Role / Timing Role: System-level power supervisor that asserts hardware reset before VCC drops below 2.63V and holds it ≥140ms post-recovery.

Use Value: Prevents corrupted register states and I/O misconfiguration during partial power loss, ensuring deterministic restart behavior.

Use Scenario: Battery-powered portable ultrasound units requiring reliable cold-start and brownout recovery.

IC Role / Device Role / Timing Role: Low-current (35µA) reset generator maintaining supervision during standby and enabling fast wake-from-reset sequencing.

Use Value: Extends battery life while guaranteeing µP reset integrity even as Li-ion voltage decays from 4.2V to 2.8V.

Automotive Body Control Modules

Smart Energy Meters

Use Scenario: Engine compartment electronics exposed to load-dump transients and wide ambient temperature swings.

IC Role / Device Role / Timing Role: Industrial-temperature (–40°C to +85°C) reset monitor immune to sub-50µs VCC glitches on 12V-regulated rails.

Use Value: Eliminates false resets caused by alternator ripple or relay switching noise, improving system uptime.

Use Scenario: Revenue-grade electricity meters with tamper detection and secure boot requirements.

IC Role / Device Role / Timing Role: Primary reset source ensuring secure bootloader execution only after stable 3.3V rail is confirmed above 2.63V.

Use Value: Enforces cryptographic key loading and firmware validation sequence integrity during power-on initialization.

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+	Same 2.63V threshold and 140ms timeout, but includes manual reset input (MR) pin	Required where system-level pushbutton-initiated reset is needed alongside power-fail detection	Select MAX706RCSA+ if MR functionality is mandatory; otherwise MAX709RESA+ offers lower pin count and cost
TPS3808G12DBVR	2.63V threshold, 200ms fixed timeout, 1.8µA typical supply current, SOT-23-5 package	Better suited for ultra-low-power battery applications; lacks SO-8 footprint compatibility	Choose TPS3808G12DBVR for space- and current-constrained designs where SO-8 mounting is not required

Compared with MAX706RCSA+, MAX709RESA+ eliminates the MR pin to reduce complexity and cost in fixed-reset-only systems; compared with TPS3808G12DBVR, it trades ultra-low current for proven SO-8 manufacturability and higher drive strength (20mA vs. 20mA sink but different V_OL specs).

Availability

MAX709RESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX709RESA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX709 belongs to Maxim's µP supervisory circuit family, engineered to replace discrete reset solutions in microprocessor-based systems with guaranteed timing, precision thresholds, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the MAX709RESA+?

The MAX709RESA+ has a factory-trimmed nominal reset threshold voltage of 2.63V with a tolerance of ±2% over the full operating temperature range (–40°C to +85°C). This value is specified in the Electrical Characteristics table of the official datasheet and applies directly to the MAX709RESA+ variant, not the broader MAX709 family.

Does the MAX709RESA+ require an external pull-up resistor on the RESET pin?

Yes, the MAX709RESA+ features an open-drain RESET output (pin 7), so an external pull-up resistor is required to establish a defined logic-high level when RESET is inactive. Typical values range from 10kΩ to 100kΩ, selected based on bus capacitance and rise-time requirements. The MAX709RESA+ itself does not provide internal pull-up.

Can the MAX709RESA+ operate reliably below 3V supply voltage?

Yes, the MAX709RESA+ operates over a V_CC range of 1.0V to 5.5V and guarantees correct RESET output state down to V_CC = 1V. Its 2.63V threshold remains valid during V_CC ramp-up and ramp-down, making it suitable for 3V and 3.3V systems experiencing brownout conditions.

What is the maximum allowable VCC transient duration that will not trigger a reset on the MAX709RESA+?

For the MAX709RESA+, a negative-going V_CC transient of up to 40µs duration will not cause a reset pulse when the overdrive (V_TH – V_CC) is 100mV. This immunity is documented in the Typical Operating Characteristics section of the MAX709 datasheet and applies specifically to the R/S/T variants including MAX709RESA+.

Is the MAX709RESA+ pin-compatible with other MAX709 suffix variants like MAX709TESA+?

No-while all MAX709 variants share identical pinout and package (SO-8), the suffix denotes different reset thresholds (R = 2.63V, S = 2.93V, T = 3.08V, etc.). The MAX709RESA+ is not functionally interchangeable with MAX709TESA+ unless the application specifically requires a 3.08V threshold instead of 2.63V.

MAX709RESA+ 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:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MAX709RESA+ FAQ

1.How can I place an order for MAX709RESA+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX709RESA+ 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 MAX709RESA+ reliable?

The price and inventory of MAX709RESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709RESA+ is usually 5 days.

3.What payment methods are accepted for MAX709RESA+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709RESA+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX709RESA+?

MAX709RESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX709RESA+ 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 MAX709RESA+?

For technical support, including MAX709RESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709RESA+ requirements.

6.How does Aetrix verify that MAX709RESA+ is sourced from the original manufacturer or authorized distributors?

All MAX709RESA+ 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 MAX709RESA+ meets industry standards.

7.What is the process for return or replacement of MAX709RESA+?

All MAX709RESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709RESA+, 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 MAX709RESA+ part is unused and in its original packaging.

Return procedure for MAX709RESA+:

1.Submit a request within 90 days.

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

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