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Analog Devices Inc./Maxim Integrated MAX6702AZKA+T
- Part No.:
- MAX6702AZKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702AZKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6702AZKA+T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC (2.32V threshold), RST_IN1, and RST_IN2 with independent 0.62V comparators, provides a 140ms reset timeout, 1.6s watchdog timer, and manual reset input - deployed in white goods power management and telecom baseband controllers.
For engineers reviewing the MAX6702AZKA+T datasheet, MAX6702AZKA+T pinout, MAX6702AZKA+T application, or MAX6702AZKA+T equivalent, key selection criteria include its active-high reset output, dual adjustable voltage monitor inputs, guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and lead-free SOT23-8 packaging compliant with industrial temperature range (-40°C to +125°C).
Technical Context
The MAX6702AZKA+T implements a triple-threshold supervision architecture: one fixed internal VCC monitor (2.32V) plus two externally adjustable inputs (RST_IN1/RST_IN2) referenced to a 0.62V internal bandgap. Its reset generator asserts active-high RESET for ≥140ms after any monitored supply falls below threshold or MR is pulled low.
It integrates a non-latching watchdog timer with 1.6s timeout (typ), where WDO deasserts immediately upon valid WDI edge or MR assertion - unlike standard versions, the 'A' variant avoids latched WDO behavior during undervoltage events, enabling faster recovery in brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-high push-pull - drives high without external pull-up, compatible with µP reset inputs requiring logic-high assertion |
| VCC Reset Threshold | 2.32V (typ), ±1.5% over -40°C to +125°C - matches +2.5V system rails with margin for dropout |
| Adjustable Monitor Inputs | RST_IN1 & RST_IN2 with 0.62V reference - support resistor-divider configuration for secondary/tertiary supply monitoring (e.g., 1.8V I/O, 1.2V core) |
| Reset Timeout Period | 140ms (min), 280ms (max) - ensures µP initialization completes before release, immune to noise-induced premature release |
| Watchdog Timeout | 1.6s (typ), 2.52s (max at +125°C) - provides sufficient window for firmware watchdog servicing while detecting lockup |
| Supply Current | 9µA (typ) at VCC < 3.6V - enables always-on supervision in battery-backed or low-power standby modes |
| Operating Voltage Range | 1.2V to 5.5V - guarantees functional reset assertion even during deep brownout down to 1.2V |
Pinout & Package
MAX6702AZKA+T is housed in an 8-pin SOT23 package (package code K8+2), RoHS-compliant, with 0.65mm pitch and thermal pad omitted. Footprint conforms to land pattern 90-0176 per Maxim's package documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces active-high RESET assertion and clears watchdog timer |
| 2 - VCC | Main supply input & primary reset monitor | Powers all internal circuitry and serves as first reset threshold source (2.32V); valid operation starts at 1.2V |
| 3 - GND | Analog/digital ground reference | Common return for all comparators, reset generator, and output drivers; must be low-impedance connection |
| 4 - PFI | Power-fail comparator input | High-impedance node (±200nA leakage) for external resistive divider; triggers PFO when voltage drops below 0.62V |
| 5 - PFO | Power-fail comparator output | Active-low push-pull output - signals early power degradation to µP interrupt or sequencer before VCC reset occurs |
| 6 - WDI | Watchdog timer input | Edge-sensitive input; rising or falling edge resets 1.6s timer; pulses as short as 50ns are detected |
| 7 - RESET | Active-high reset output | Push-pull driver capable of sourcing 500µA at 0.8×VCC - directly interfaces with µP reset pins requiring high-level assertion |
| 8 - WDO | Watchdog output | Active-low push-pull output - indicates watchdog timeout or undervoltage condition; deasserts immediately on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply supervision | Simultaneously monitors VCC (2.32V), RST_IN1, and RST_IN2 via shared 0.62V reference - eliminates need for three discrete supervisors in multirail systems |
| Guaranteed reset down to VCC = 1V | RESET remains valid and actively driven until VCC falls below 1V - ensures deterministic reset behavior during severe brownout |
| A-version watchdog behavior | WDO deasserts instantly when undervoltage ends (no timeout delay), unlike latched standard versions - reduces system recovery latency after transient dips |
| Immunity to short VCC transients | Rejects glitches ≤100ns duration on VCC - prevents false resets from switching noise or ESD-induced supply perturbations |
| Low quiescent current | 9µA typical supply current at VCC < 3.6V - extends battery life in always-on monitoring applications such as smart meter backup circuits |
Applications
| White Goods Control | Telecom Baseband |
|---|---|
Use Scenario: Monitoring +2.5V system rail, +1.8V I/O supply, and +1.2V DSP core in washing machine main controller. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting active-high RESET to ARM Cortex-M4 MCU upon any rail dropout, with PFO signaling AC line sag to initiate safe motor shutdown. Use Value: Prevents corrupted EEPROM writes and erratic motor sequencing during brownout by guaranteeing synchronized reset across all voltage domains. | Use Scenario: Supervising +3.3V PHY interface, +2.5V clock buffer, and +1.8V FPGA configuration rail in LTE small cell radio unit. IC Role / Device Role / Timing Role: Active-high RESET output directly drives FPGA PROG_B pin; WDO connected to baseband processor NMI to trigger watchdog recovery without full reset. Use Value: Enables rapid firmware-level recovery from hang states while preserving FPGA configuration state, reducing cell outage time. |
| Industrial PLC I/O Module | Intelligent Power Meter |
Use Scenario: Validating +5V analog front-end, +3.3V microcontroller, and +2.5V ADC reference in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: RST_IN1 monitors isolated 3.3V DC-DC output; PFI senses auxiliary 12V supply; RESET asserts high to lock out I/O updates during fault. Use Value: Ensures deterministic fail-safe behavior: all digital outputs go to known safe state (e.g., OFF) when any monitored supply fails. | Use Scenario: Supervising +3.3V metrology SoC, +1.8V RTC backup, and +2.5V precision reference in revenue-grade electricity meter with supercapacitor backup. IC Role / Device Role / Timing Role: Uses PFO to trigger RTC save-to-EEPROM sequence when main supply drops; MR tied to tamper switch for forced reset on enclosure breach. Use Value: Guarantees integrity of billing data during power interruption by initiating atomic storage before VCC falls below 2.32V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702MZKA+T | Fixed VCC threshold 4.38V instead of 2.32V; identical pinout, timing, and feature set | Suitable for +5V legacy systems rather than +2.5V modern embedded designs | Select MAX6702MZKA+T only if supervising 4.5–5.5V rails; otherwise MAX6702AZKA+T matches low-voltage multirail architectures. |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold), no RST_IN1/RST_IN2 inputs, no PFI/PFO, open-drain RESET | Lacks triple-monitoring capability and power-fail warning; requires external pull-up and separate PFI circuitry | Choose TPS3808G33DBVR only for cost-sensitive single-rail applications where adjustable monitoring and early warning are unnecessary. |
Compared with MAX6702MZKA+T and TPS3808G33DBVR, MAX6702AZKA+T uniquely supports simultaneous monitoring of three independent supplies with integrated power-fail warning - critical for space-constrained multivoltage systems where board area and BOM count must be minimized.
Availability
MAX6702AZKA+T is available at Aetrix Electronics and suitable for white goods control, telecom baseband modules, and intelligent power metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6702AZKA+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 precision analog and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability and integration.
The MAX6701–MAX6708 family targets microprocessor supervision in harsh environments, delivering multivoltage monitoring, watchdog safety, and power-fail warning in minimal SOT23 footprint for space-constrained embedded systems.
FAQ
What is the reset threshold voltage for MAX6702AZKA+T?
The MAX6702AZKA+T has a fixed VCC reset threshold of 2.32V (typical), with ±1.5% tolerance over -40°C to +125°C. This value corresponds to the 'Z' suffix in the part number and is optimized for +2.5V system rails. The device also supports two additional adjustable thresholds via RST_IN1 and RST_IN2, each referenced to an internal 0.62V comparator.
Does MAX6702AZKA+T provide active-high or active-low reset output?
MAX6702AZKA+T provides an active-high push-pull reset output (pin 7). Unlike MAX6702A variants with active-low outputs, this version asserts RESET high during fault conditions and holds it high for the full 140ms timeout period. It requires no external pull-up resistor and directly interfaces with microprocessors expecting high-level reset assertion.
How does the watchdog timer behave in MAX6702AZKA+T?
The MAX6702AZKA+T watchdog timer has a 1.6s typical timeout period. As an 'A' version, WDO deasserts immediately when the undervoltage condition ends - unlike non-A versions that latch WDO low until a WDI edge occurs. WDO also deasserts upon MR low or valid WDI transition, enabling fast recovery from transient faults without requiring firmware intervention.
Can MAX6702AZKA+T monitor voltages other than VCC?
Yes, MAX6702AZKA+T can monitor two additional voltages via RST_IN1 and RST_IN2 pins, each compared against a 0.62V internal reference. Using external resistor dividers, users can configure trip points for secondary supplies (e.g., 1.8V, 1.2V). Reset asserts if any of the three monitored inputs - VCC, RST_IN1, or RST_IN2 - falls below its respective threshold.
What is the operating temperature range for MAX6702AZKA+T?
MAX6702AZKA+T is rated for operation from -40°C to +125°C ambient temperature. This industrial-grade range is validated across all electrical specifications including reset threshold accuracy, watchdog timeout, and supply current. The device uses BiCMOS process technology and is packaged in a lead-free 8-pin SOT23 (K8+2) package compliant with RoHS requirements.
MAX6702AZKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.32V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6702AZKA+T FAQ
1.How can I place an order for MAX6702AZKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702AZKA+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 MAX6702AZKA+T reliable?
The price and inventory of MAX6702AZKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702AZKA+T is usually 5 days.
3.What payment methods are accepted for MAX6702AZKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702AZKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702AZKA+T?
MAX6702AZKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702AZKA+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 MAX6702AZKA+T?
For technical support, including MAX6702AZKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702AZKA+T requirements.
6.How does Aetrix verify that MAX6702AZKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6702AZKA+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 MAX6702AZKA+T meets industry standards.
7.What is the process for return or replacement of MAX6702AZKA+T?
All MAX6702AZKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702AZKA+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 MAX6702AZKA+T part is unused and in its original packaging.
Return procedure for MAX6702AZKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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