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Analog Devices Inc./Maxim Integrated MAX6704RKA+T
- Part No.:
- MAX6704RKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6704RKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
MAX6704RKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing dual active-low/active-high push-pull reset outputs, an adjustable power-fail comparator (PFI/PFO), manual reset input (MR), and a reset-based watchdog timer with 1.6s timeout. It monitors +2.55V to +3.6V supply rails and guarantees valid reset operation down to VCC = 1V, used in critical µP power monitoring for white goods and telecom systems.
For engineers reviewing the MAX6704RKA+T datasheet, MAX6704RKA+T pinout, MAX6704RKA+T application, or MAX6704RKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing (140ms timeout), PFI threshold (618mV typ), and validated alternatives for dual-output voltage supervision in industrial embedded designs.
Technical Context
The MAX6704RKA+T implements a dual-stage reset generator with complementary push-pull outputs: one active-low (RESET) and one active-high (RESET), both asserted simultaneously during VCC brownout, MR assertion, or watchdog timeout. Its internal 0.62V reference enables precise external voltage monitoring via PFI, with PFO delivering active-low power-fail warning independent of reset state.
Unlike standard MAX6701–MAX6707 variants, the MAX6704 integrates watchdog functionality directly into the reset path - a timeout on WDI triggers a full reset pulse (not a separate WDO signal), eliminating need for external logic to convert watchdog events into system reset. This architecture simplifies design for applications requiring guaranteed recovery after firmware lockup without dedicated watchdog output routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.55V to 3.6V - supports stable supervision of +2.5V and +3.3V logic rails without external regulation |
| Reset Timeout Period | 140ms (min) - ensures µP completes boot sequence before release, preventing premature execution |
| PFI Threshold Voltage | 618mV (typ) - sets accurate power-fail detection point when used with external resistor divider |
| Watchdog Timeout | 1.6s (typ) - provides sufficient margin for typical firmware task cycles while detecting hangs |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive modules and industrial control environments |
| Reset Output Type | Dual active-low/active-high push-pull - eliminates need for external inverters or pull-up resistors in reset distribution |
| Supply Current | 9µA (typ at VCC < 3.6V) - enables use in battery-backed or low-power always-on monitoring circuits |
Pinout & Package
MAX6704RKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup; pulling low forces full reset pulse for debug or recovery |
| 2 - VCC | Main supply input | Power source for internal comparators and push-pull outputs; also primary reset monitor input |
| 3 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance for noise immunity |
| 4 - PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external voltage divider for custom trip points |
| 5 - PFO | Power-fail output | Active-low push-pull output; asserts independently of RESET to warn µP of impending supply collapse |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising/falling transition resets internal 1.6s timer; no level-hold requirement |
| 7 - RESET | Active-low reset output | Push-pull driver capable of sinking 1.2mA at 2.55V; asserts during VCC brownout, MR, or watchdog timeout |
| 8 - RESET | Active-high reset output | Complementary push-pull output; high-true signal synchronized to RESET low pulse for mixed-logic systems |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull signals eliminate need for external inverters in FPGA/CPLD or mixed-voltage µP systems |
| Adjustable power-fail detection | PFI/PFO pair enables early-warning shutdown sequencing for nonvolatile memory write protection or data flush operations |
| Reset-based watchdog | WDI-triggered timeout asserts full reset pulse - no separate WDO routing required, reducing PCB trace count and layout complexity |
| Guaranteed reset validity to 1V | Ensures deterministic reset behavior during deep brownout or backup battery switchover, critical for fail-safe operation |
| Immunity to short VCC transients | Rejects sub-20µs supply dips, preventing spurious resets in noisy industrial or motor-drive environments |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Embedded controller in network-attached storage (NAS) unit requires reliable power sequencing and hang recovery during firmware updates. IC Role / Device Role / Timing Role: MAX6704RKA+T monitors +3.3V CPU core rail and generates synchronized active-low/active-high reset pulses; PFO warns of PSU degradation before brownout. Use Value: Dual reset outputs interface directly with ARM SoC (active-low) and companion CPLD (active-high), eliminating level-shifting components. |
Use Scenario: Industrial Ethernet switch with PoE midspan powering experiences intermittent AC line sags affecting DC-DC converters. IC Role / Device Role / Timing Role: MAX6704RKA+T supervises +2.5V PHY supply; WDI tied to MAC's heartbeat GPIO; PFI monitors auxiliary 5V bias rail. Use Value: 140ms reset timeout prevents false reboots during brief sags, while watchdog ensures recovery if MAC firmware freezes during packet processing. |
| White Goods | Telecommunications |
Use Scenario: Smart refrigerator control board uses microcontroller with EEPROM logging; must prevent corruption during compressor startup surges. IC Role / Device Role / Timing Role: MAX6704RKA+T monitors +3.3V MCU supply; MR connected to door-open sensor; PFO triggers EEPROM write-protection before power collapse. Use Value: Guaranteed reset down to VCC = 1V ensures safe shutdown even during rapid discharge of bulk capacitors after main power loss. |
Use Scenario: Cellular base station remote radio head (RRH) requires fail-safe restart after lightning-induced transient on +2.8V RF amplifier supply. IC Role / Device Role / Timing Role: MAX6704RKA+T supervises +2.55V to +3.6V range; dual reset outputs drive FPGA configuration logic and analog front-end enable lines. Use Value: Complementary outputs allow simultaneous reset of digital and analog subsystems without skew, maintaining signal integrity during recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6708RKA+T | Omits watchdog timer; identical dual reset outputs, PFI/PFO, and 140ms timeout | Suitable where firmware hang detection is handled externally or not required | Select MAX6708RKA+T when watchdog functionality adds unnecessary cost or complexity |
| TPS3808G33DBVR | Single active-low open-drain reset; no complementary output or PFO; 200ms timeout; 3.3V fixed threshold only | Lacks power-fail warning and dual-output capability; requires external pull-up and inverter for active-high signal | Choose TPS3808G33DBVR only for basic reset-only applications with strict 3.3V supervision and no PFI/PFO need |
Compared with MAX6704RKA+T, MAX6708RKA+T removes watchdog dependency while retaining identical supervision accuracy and dual-output flexibility, whereas TPS3808G33DBVR reduces feature set to minimal reset generation - making MAX6704RKA+T the optimal choice when coordinated power-fail warning and complementary reset signaling are required.
Availability
MAX6704RKA+T is available at Aetrix Electronics and suitable for white goods, telecommunications infrastructure, and industrial embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6704RKA+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 demanding industrial, automotive, and communications applications, emphasizing reliability, integration, and thermal robustness.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained systems, combining reset, watchdog, and power-fail functions in ultra-small SOT23 packages without sacrificing accuracy or temperature stability.
FAQ
What is the exact reset threshold voltage for MAX6704RKA+T?
The "R" suffix in MAX6704RKA+T specifies a nominal reset threshold of 2.63V (with min/max of 2.53V/2.72V over −40°C to +125°C). This value applies to the VCC-supply monitoring function and is factory-trimmed - not user-adjustable. The PFI input retains its fixed 0.62V internal reference for external voltage monitoring.
Does MAX6704RKA+T provide a dedicated watchdog output (WDO) pin?
No, MAX6704RKA+T does not include a WDO pin. Unlike MAX6701–MAX6707 variants, it implements a reset-based watchdog: a timeout on WDI triggers the internal reset generator, asserting both RESET and RESET outputs for the full 140ms timeout period. There is no separate watchdog status signal.
How is the power-fail warning implemented on MAX6704RKA+T?
MAX6704RKA+T uses the PFI (power-fail input) and PFO (power-fail output) pins. PFI is a high-impedance input referenced to an internal 0.62V comparator; connecting it to a resistor divider from a monitored rail allows setting custom trip points. When PFI falls below 0.62V, PFO asserts active-low independently of the reset state.
What are the logic levels and drive strength of the dual reset outputs on MAX6704RKA+T?
Both RESET (pin 7) and RESET (pin 8) are push-pull outputs. At VCC = 2.55V, each can sink 1.2mA while maintaining VOL ≤ 0.3V, and source 500µA while maintaining VOH ≥ 0.8×VCC. They are electrically complementary: when RESET is low, RESET is high, and vice versa - synchronized within nanoseconds.
Can MAX6704RKA+T monitor voltages other than VCC?
Yes - via the PFI pin. By connecting a resistor divider from any system voltage (e.g., +5V, +12V, or analog supply) to PFI, the device detects when that voltage drops below the trip point defined by the divider ratio and the internal 0.62V reference. PFO then provides an early warning interrupt before VCC brownout occurs.
MAX6704RKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6704RKA+T FAQ
1.How can I place an order for MAX6704RKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6704RKA+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 MAX6704RKA+T reliable?
The price and inventory of MAX6704RKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6704RKA+T is usually 5 days.
3.What payment methods are accepted for MAX6704RKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6704RKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6704RKA+T?
MAX6704RKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6704RKA+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 MAX6704RKA+T?
For technical support, including MAX6704RKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6704RKA+T requirements.
6.How does Aetrix verify that MAX6704RKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6704RKA+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 MAX6704RKA+T meets industry standards.
7.What is the process for return or replacement of MAX6704RKA+T?
All MAX6704RKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6704RKA+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 MAX6704RKA+T part is unused and in its original packaging.
Return procedure for MAX6704RKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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