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Analog Devices Inc./Maxim Integrated MAX6704RKA
- Part No.:
- MAX6704RKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6704RKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6704RKA from Maxim Integrated is a low-voltage 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 a single supply voltage (e.g., +3.3V or +5.0V), guarantees valid reset down to VCC = 1V, and supports critical µP power monitoring in automotive and industrial control systems.
For engineers reviewing the MAX6704RKA datasheet, MAX6704RKA pinout, MAX6704RKA application, or MAX6704RKA equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset timing (140ms timeout), PFI threshold (620mV), and substitution guidance grounded in Maxim's official family documentation and ordering data.
Technical Context
The MAX6704 implements a dual-stage reset generator with complementary push-pull outputs: RESET (active-low) and RESET (active-high), both asserted simultaneously during VCC brownout, power-up, or MR assertion. Its reset timeout is fixed at 140ms (typ) and guaranteed over –40°C to +125°C.
A dedicated 0.62V internal reference enables the PFI/PFO comparator for early power-fail warning, while the watchdog function triggers a full reset pulse-not an independent WDO output-upon WDI timeout, distinguishing it from MAX6701–MAX6707 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 140ms typical; ensures µP remains held in reset long enough for stable power rail recovery before boot sequence initiation. |
| VCC Reset Threshold | 4.38V (R-suffix); precise trip point for +5V system supervision with ±3% tolerance over temperature. |
| PFI Threshold Voltage | 620mV (typ); sets external voltage-divider trip level for secondary supply monitoring (e.g., 3.3V, 2.5V rails). |
| Watchdog Timeout | 1.6s (typ); initiates a full reset pulse on WDI inactivity-no separate WDO pin, unlike MAX6705A. |
| Supply Current | 9µA (typ at VCC = 3.3V); ultra-low quiescent current enables use in battery-backed or always-on monitoring circuits. |
| Operating Voltage Range | 1.2V to 5.5V; supports valid reset assertion even as VCC falls below 1.2V, down to 1.0V with guaranteed VOL ≤ 0.4V. |
| Package | 8-pin SOT23-8; surface-mount footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
MAX6704RKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and lead-free plating available (suffix +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset pulse for full timeout period; debounces pushbutton switches. |
| 2 - VCC | Main supply input | Power source for internal circuitry and reset outputs; also serves as primary reset monitor input (threshold = 4.38V for R-suffix). |
| 3 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance for noise immunity. |
| 4 - PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; connects to external resistor divider to set custom undervoltage warning threshold. |
| 5 - PFO | Power-fail output | Active-low push-pull output; asserts when PFI < 620mV; used to interrupt µP or trigger orderly shutdown before main supply collapse. |
| 6 - WDI | Watchdog input | Edge-sensitive input; requires toggle within 1.6s to prevent watchdog timeout; rising/falling edge clears internal timer. |
| 7 - RESET | Active-low reset output | Push-pull driver; asserts low during VCC brownout, MR activation, or watchdog timeout; holds low for 140ms after fault clears. |
| 8 - RESET | Active-high reset output | Complementary push-pull output; high during normal operation, low only during reset assertion-enables direct interface to µP reset pins requiring active-high logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate need for external inverters in mixed-logic systems. |
| Adjustable power-fail detection | PFI/PFO pair provides user-configurable early-warning capability for secondary supplies (e.g., I/O or core rails) with 620mV reference. |
| Reset-based watchdog timer | Generates full reset pulse on WDI timeout-no separate watchdog output required-simplifying system-level fault recovery design. |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery-depletion scenarios without external supervision. |
| Immunity to short VCC transients | Rejects fast falling-edge glitches ≤100ns, preventing spurious resets in electrically noisy environments like automotive ECUs. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Monitoring |
|---|---|
Use Scenario: Continuous monitoring of 5V sensor supply and 3.3V MCU core rail in under-hood ECU modules exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary supervisory IC asserting dual-reset signals to lock MCU until both rails stabilize; PFI monitors 3.3V rail via resistor divider for pre-failure alert. Use Value: Prevents erratic MCU execution during transient brownouts; PFO-triggered NMI allows firmware to save critical state before main supply collapse. |
Use Scenario: Supervision of isolated 24V-to-5V DC-DC converter output powering logic and I/O in factory-floor programmable logic controllers. IC Role / Device Role / Timing Role: Single-chip solution delivering synchronized active-low and active-high reset to FPGA and ARM-based controller; MR tied to front-panel reset button. Use Value: Eliminates discrete reset generator + inverter + comparator design; 140ms timeout ensures reliable boot after power interruption without oversizing capacitor networks. |
| White Goods Main Control Board | Networking Equipment Power Sequencing |
Use Scenario: Power integrity assurance for microcontroller and display driver ICs in washing machine control boards operating across wide ambient temperatures (–25°C to +70°C). IC Role / Device Role / Timing Role: Monitors main 5V rail (VCC) and auxiliary 3.3V rail (via PFI); generates reset pulse on any rail failure; WDI fed by MCU heartbeat signal. Use Value: Watchdog-triggered reset recovers hung firmware without requiring service technician intervention; PFO alerts system manager before complete power loss. |
Use Scenario: Coordinated reset sequencing for multi-rail switch-mode power supplies (12V, 5V, 3.3V) feeding Ethernet PHY, MAC, and memory in enterprise switches. IC Role / Device Role / Timing Role: Uses PFI to monitor 3.3V standby rail; asserts RESET only when main 12V/5V rails are stable *and* standby rail remains above threshold. Use Value: Enables safe power-up order enforcement without external timing RC networks; dual outputs simplify interface to legacy and modern SoC reset requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705RKA | Single active-low push-pull reset output; includes independent WDO pin and adjustable PFI/PFO; no active-high RESET. | Suitable where watchdog status must be monitored separately (e.g., NMI-driven diagnostics), not just used for reset generation. | Select MAX6705RKA if system requires independent watchdog fault signaling alongside reset-MAX6704RKA integrates watchdog action directly into reset pulse. |
| MAX6708RKA | Identical pinout and dual complementary reset outputs, but lacks watchdog timer entirely; no WDI pin or timeout functionality. | Used in cost-sensitive or safety-certified designs where watchdog is omitted per architectural requirement (e.g., ISO 26262 ASIL-B). | Choose MAX6708RKA only when watchdog is unnecessary; MAX6704RKA adds watchdog-triggered reset without layout change or BOM increase. |
Compared with MAX6705RKA, MAX6704RKA trades independent watchdog signaling for integrated reset-based fault recovery-reducing external interrupt routing complexity. Against MAX6708RKA, it adds watchdog capability with zero PCB modification, enabling enhanced firmware reliability without sacrificing dual-output flexibility.
Availability
MAX6704RKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, white goods main control boards, and networking equipment requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for MAX6704RKA 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 compact, multivoltage microprocessor supervision-delivering reset, watchdog, power-fail warning, and manual reset in minimal SOT23 footprints for space-constrained embedded systems.
FAQ
What is the reset timeout period for MAX6704RKA, and is it adjustable?
The MAX6704RKA features a fixed reset timeout period of 140ms (typical), guaranteed from –40°C to +125°C. This value is internally trimmed and not user-adjustable via external components. The timeout begins after VCC, MR, or WDI fault conditions clear and ensures sufficient hold time for microprocessor initialization before release. MAX6704RKA does not support programmable or resistor-set timeout durations.
Does MAX6704RKA provide an independent watchdog output (WDO) pin?
No, MAX6704RKA does not include a WDO pin. Unlike MAX6701–MAX6707 variants, its watchdog function is reset-based: a WDI timeout directly triggers the dual RESET outputs for the full 140ms period. This eliminates the need for external logic to convert WDO assertion into a reset signal, simplifying board layout and reducing component count compared to designs using MAX6705RKA.
What is the function of the two RESET pins on MAX6704RKA?
MAX6704RKA provides complementary reset outputs: Pin 7 is active-low RESET (goes low during fault), and Pin 8 is active-high RESET (goes high during fault). Both are push-pull and assert/deassert simultaneously. This allows direct interfacing with microprocessors requiring either polarity without external inverters-e.g., Pin 7 to ARM reset, Pin 8 to FPGA reset-maximizing design flexibility in mixed-logic systems.
How is the power-fail threshold set on MAX6704RKA?
The MAX6704RKA uses an internal 0.62V reference for its PFI comparator. To set a custom power-fail threshold (e.g., 3.3V or 2.5V), connect PFI (Pin 4) to a resistive divider from the monitored rail to GND. The divider ratio is calculated as R1/R2 = (VTRIP / 0.62) – 1. PFO (Pin 5) then asserts low when the divided voltage falls below 0.62V, enabling early warning before main supply collapse.
What is the operating voltage range for MAX6704RKA, and does it support 3.3V systems?
MAX6704RKA operates from 1.2V to 5.5V and fully supports 3.3V systems. Its R-suffix variant has a 4.38V VCC reset threshold, making it ideal for +5V supervision, but the device itself functions correctly with VCC = 3.3V (e.g., when monitoring a secondary rail via PFI). Supply current is only 9µA (typ) at 3.3V, ensuring minimal impact on system power budget.
MAX6704RKA 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6704RKA FAQ
1.How can I place an order for MAX6704RKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6704RKA 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 reliable?
The price and inventory of MAX6704RKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6704RKA is usually 5 days.
3.What payment methods are accepted for MAX6704RKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6704RKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6704RKA?
MAX6704RKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6704RKA 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?
For technical support, including MAX6704RKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6704RKA requirements.
6.How does Aetrix verify that MAX6704RKA is sourced from the original manufacturer or authorized distributors?
All MAX6704RKA 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 meets industry standards.
7.What is the process for return or replacement of MAX6704RKA?
All MAX6704RKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6704RKA, 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 part is unused and in its original packaging.
Return procedure for MAX6704RKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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