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Analog Devices Inc./Maxim Integrated MAX6702RKA-T
- Part No.:
- MAX6702RKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702RKA-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6702RKA-T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC, RST_IN1, and RST_IN2 with a 2.63V fixed VCC reset threshold (R-suffix), provides 140ms reset timeout, independent watchdog output (WDO), and 0.62V power-fail comparator input. It is used in critical µP power monitoring for industrial controllers and intelligent instruments.
For engineers reviewing the MAX6702RKA-T datasheet, MAX6702RKA-T pinout, MAX6702RKA-T application, or MAX6702RKA-T equivalent, this page delivers verified circuit role, exact reset threshold (2.63V), watchdog timeout (1.6s), supply range (1.2–5.5V), and SOT23-8 package compatibility - all confirmed from Maxim's official datasheet Rev 4 (May 2014).
Technical Context
The MAX6702RKA-T implements a triple-threshold supervision architecture: one fixed VCC monitor (2.63V) plus two user-adjustable inputs (RST_IN1/RST_IN2) referenced to 0.62V internal reference. Reset assertion occurs if any monitored voltage falls below its threshold, with guaranteed reset validity down to VCC = 1V.
Its watchdog timer triggers WDO low after 1.6s of no WDI edge transition, and WDO deasserts immediately upon valid WDI toggle or MR pull-low - unlike non-A versions where WDO latches. The active-high RESET output complements the standard active-low variant and drives push-pull logic directly without external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (R-suffix), ±0.02V tolerance over -40°C to +125°C - sets precise brownout detection point for +2.5V system rails |
| Reset Timeout Period | 140ms (typ), 120–300ms over temperature - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware activity monitoring without false triggers |
| Supply Voltage Range | 1.2V to 5.5V - supports operation across legacy 5V, modern 3.3V/2.5V, and low-power 1.8V domains |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply droop via external resistor divider |
| Reset Output Type | Active-high push-pull - eliminates need for external pull-up resistor and drives CMOS/TTL loads directly |
| Quiescent Current | 9–20µA at VCC < 3.6V - minimizes standby power in battery-backed or energy-sensitive applications |
Pinout & Package
MAX6702RKA-T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant with lead-free option available (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces immediate reset and clears watchdog timer |
| 2 VCC | Main supply input | Powers internal circuitry and defines primary reset threshold; valid from 1.2V to 5.5V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | High-impedance (±200nA leakage) node referenced to 0.62V internal reference; accepts external voltage divider for secondary rail monitoring |
| 5 PFO | Power-fail comparator output | Active-low open-drain output; asserts when PFI < 0.62V - used for early warning interrupt or cascaded reset initiation |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; 50ns minimum pulse width supported |
| 7 RESET | Active-high reset output | Push-pull output asserted high during reset condition; sinks 1.2mA at VCC ≥ 2.55V; valid down to VCC = 1V |
| 8 WDO | Watchdog output | Active-low push-pull output; asserts independently of RESET on watchdog timeout or undervoltage; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC (2.63V fixed), RST_IN1, and RST_IN2 (both adjustable via 0.62V reference) - enables full-system rail integrity checking |
| Guaranteed reset validity to 1V | RESET output remains functional and logic-valid even as VCC decays to 1.0V - ensures clean shutdown sequencing in brownout conditions |
| Immunity to short VCC transients | Rejects transients ≤10µs duration at up to 60mV overdrive - prevents spurious resets from switching noise or ESD coupling |
| Independent watchdog output | WDO operates separately from RESET and asserts on both watchdog timeout *and* VCC/RST_IN undervoltage - supports NMI-based fault logging without reset interference |
| Low quiescent current | 9µA typical at VCC < 3.6V - extends battery life in portable instrumentation and remote sensor nodes |
Applications
| Industrial Controllers | Intelligent Instruments |
|---|---|
Use Scenario: PLC and motion controller modules requiring reliable power-on initialization and brownout recovery in factory automation environments. IC Role / Device Role / Timing Role: Supervisory IC providing active-high RESET signal to ARM Cortex-M or Renesas RX microcontrollers, with dual-voltage monitoring for I/O and core supplies. Use Value: Guarantees µP reset assertion until all rails stabilize, preventing corrupted register states or flash writes during unstable power transitions. |
Use Scenario: Portable multimeters and handheld analyzers with dual-supply architectures (e.g., 3.3V MCU + 5V analog front-end). IC Role / Device Role / Timing Role: Triple-monitor supervisor asserting RESET high when either main VCC (2.63V), analog supply (via RST_IN1), or reference rail (via RST_IN2) drops out. Use Value: Enables deterministic power-fail response by triggering controlled data save and display shutdown before supply collapse. |
| Critical µP Power Monitoring | White Goods |
Use Scenario: Medical diagnostic equipment and telecom baseband processors where uncontrolled reset can cause safety-critical state loss. IC Role / Device Role / Timing Role: Primary power supervisor with 140ms timeout and 0.62V PFI input used to generate preemptive interrupt (PFO → µP NMI) before VCC brownout. Use Value: Provides 1–2ms advance warning via PFO to initiate emergency data flush and safe state capture prior to hard reset. |
Use Scenario: Smart refrigerator and washing machine main control boards operating across wide ambient temperatures (-25°C to +70°C). IC Role / Device Role / Timing Role: Supervisory IC monitoring +3.3V system rail and +5V display backlight supply using RST_IN1, with manual reset for service mode entry. Use Value: Ensures consistent boot behavior despite line voltage sags and compressor-induced supply dips, reducing field returns due to lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702RKA+ | Identical functionality and pinout; lead-free packaging (+T suffix replaced with +) | No functional difference; required for RoHS-compliant manufacturing | Select MAX6702RKA+ when lead-free compliance is mandated by end-equipment regulatory requirements |
| MAX6706RKA-T | Same 2.63V VCC threshold and SOT23-8 package, but active-high push-pull RESET *and* independent watchdog output (WDO) - matches MAX6702RKA-T's output polarity and supervision scope | Supports identical triple-rail monitoring use cases; differs only in internal reset generator timing (slightly wider tRP tolerance) | Choose MAX6706RKA-T if design requires marginally longer reset timeout (up to 300ms) for slower-starting peripherals |
Compared with MAX6702RKA-T, MAX6702RKA+ offers identical electrical and timing behavior in lead-free packaging, while MAX6706RKA-T extends reset timeout range for systems with slower power-rail stabilization - both retain the critical 2.63V threshold, active-high RESET, and independent WDO needed for reliable µP supervision.
Availability
MAX6702RKA-T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, critical µP power monitoring, white goods, and telecommunications equipment requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6702RKA-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 expertise in power management and reliability-critical supervision.
The MAX6701–MAX6708 family was engineered specifically for robust, low-component-count microprocessor supervision in harsh environments - delivering integrated reset, watchdog, power-fail warning, and manual reset in ultra-small SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6702RKA-T?
The MAX6702RKA-T has a fixed VCC reset threshold of 2.63V (R-suffix), specified with ±0.02V tolerance over the full operating temperature range (-40°C to +125°C). This value is guaranteed per Maxim's Electrical Characteristics table and applies to the primary VCC monitor input; RST_IN1 and RST_IN2 thresholds are user-adjustable via external resistors referenced to the internal 0.62V comparator.
Does MAX6702RKA-T support active-high reset output?
Yes, the MAX6702RKA-T features an active-high push-pull RESET output (pin 7), which is asserted high during reset conditions and deasserted low otherwise. This eliminates the need for an external pull-up resistor and directly interfaces with µPs requiring active-high reset signals - a key differentiator from the MAX6701/MAX6703 variants.
What is the watchdog timeout period for MAX6702RKA-T?
The MAX6702RKA-T watchdog timeout period is 1.6s (typical), with a guaranteed range of 0.96s to 2.52s over the full -40°C to +125°C temperature range. The watchdog timer resets on any WDI edge (rising or falling) and asserts WDO low upon timeout - WDO deasserts immediately upon next valid WDI transition or MR pull-low.
Can MAX6702RKA-T monitor more than one supply voltage?
Yes, the MAX6702RKA-T monitors three supply voltages: VCC (2.63V fixed threshold), RST_IN1, and RST_IN2 (both adjustable via external resistor dividers referenced to the internal 0.62V comparator). Reset is asserted if *any* of these three inputs falls below its respective threshold, making it ideal for multi-rail systems like industrial controllers with separate I/O, core, and analog supplies.
What package type and dimensions does MAX6702RKA-T use?
The MAX6702RKA-T uses an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm. It is RoHS-compliant and available in both leaded (-T) and lead-free (+T) variants. The land pattern (footprint) is documented as 90-0176 on Maxim's packaging website.
MAX6702RKA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.63V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6702RKA-T FAQ
1.How can I place an order for MAX6702RKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702RKA-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 MAX6702RKA-T reliable?
The price and inventory of MAX6702RKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702RKA-T is usually 5 days.
3.What payment methods are accepted for MAX6702RKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702RKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702RKA-T?
MAX6702RKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702RKA-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 MAX6702RKA-T?
For technical support, including MAX6702RKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702RKA-T requirements.
6.How does Aetrix verify that MAX6702RKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6702RKA-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 MAX6702RKA-T meets industry standards.
7.What is the process for return or replacement of MAX6702RKA-T?
All MAX6702RKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702RKA-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 MAX6702RKA-T part is unused and in its original packaging.
Return procedure for MAX6702RKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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