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Analog Devices Inc./Maxim Integrated MAX6704SKA+T
- Part No.:
- MAX6704SKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6704SKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,463
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Product details
Overview
MAX6704SKA+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 independent adjustable power-fail comparator (PFI/PFO), manual reset input (MR), and a reset-based watchdog timer. It monitors +3.3V systems (threshold = 3.08V), guarantees reset validity down to VCC = 1V, and delivers a 140ms reset timeout delay. It is used in critical µP power monitoring for white goods and networking equipment.
For engineers reviewing the MAX6704SKA+T datasheet, MAX6704SKA+T pinout, MAX6704SKA+T application, or MAX6704SKA+T equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset threshold (3.08V), power-fail comparator behavior (0.62V reference), and real-world substitution guidance - all extracted from Maxim's official MAX6701–MAX6708 family datasheet (Rev 4, May 2014).
Technical Context
The MAX6704SKA+T implements a dual-output reset architecture: one active-low RESET and one active-high RESET output, both push-pull, asserted simultaneously during VCC brownout, manual reset, or watchdog timeout. Its power-fail comparator features externally adjustable trip point via PFI (0.62V internal reference) and open-drain or push-pull PFO output with ≤1µs propagation delay.
Unlike MAX6701–MAX6703(A) variants, it lacks RST_IN1/RST_IN2 inputs and does not support triple-voltage monitoring; unlike MAX6705–MAX6707(A), it omits independent WDO output; unlike MAX6708, it retains the reset-based watchdog function - asserting a full reset pulse on timeout rather than latching WDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ) at VCC falling; factory-trimmed for +3.3V supply supervision with ±3% tolerance over -40°C to +125°C |
| Reset Timeout Delay | 140ms (min) / 280ms (max); ensures µP remains held in reset long enough for stable clock and supply settling |
| Power-Fail Reference | 0.62V (typ) internal bandgap reference; enables precise early-warning detection of secondary supply droop via external resistor divider |
| Supply Voltage Range | 1.0V to 5.5V; guarantees functional reset assertion even during deep brownout conditions down to 1V VCC |
| Watchdog Behavior | Reset-based (not latch-based); asserts RESET pulse for full timeout period (140–280ms) upon 1.6s WDI inactivity - no separate WDO pin |
| Output Configuration | Dual push-pull RESET: one active-low, one active-high; eliminates need for external inverters in systems requiring both polarities |
| Manual Reset Input | CMOS-compatible MR with 50kΩ internal pullup; debounced by reset timeout, enabling direct pushbutton interface without external RC |
Pinout & Package
MAX6704SKA+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 and lead(Pb)-free (denoted by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC; pulling low forces full reset pulse; compatible with pushbutton or logic-level control |
| 2 - VCC | Main supply input and primary reset monitor | Supplies internal circuitry and serves as reference for reset threshold detection; valid from 1.0V to 5.5V |
| 3 - GND | Ground reference | Return path for all internal comparators, timers, and output drivers; must be low-impedance for noise immunity |
| 4 - PFI | Power-fail voltage monitor input | High-impedance node tied to 0.62V internal reference; accepts external resistive divider to set custom trip point for secondary supplies |
| 5 - PFO | Power-fail comparator output | Push-pull active-low output; asserts when PFI < 0.62V; can drive µP interrupt or trigger backup power switchover |
| 6 - WDI | Watchdog input | Edge-sensitive input; requires toggle within 1.6s (±20%) to prevent watchdog timeout and subsequent reset assertion |
| 7 - RESET | Active-low reset output | Push-pull driver; sinks ≥1.2mA at VCC ≥ 2.55V; guaranteed low ≤0.4V down to VCC = 1V |
| 8 - RESET | Active-high reset output | Complementary push-pull driver; sources ≥500µA at VCC ≥ 2.7V; high = ≥0.8×VCC when deasserted |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Eliminates external inverter requirement in systems needing both active-low and active-high reset signals to different peripherals |
| Adjustable power-fail warning | Enables early system shutdown or data save before main supply collapse using only two external resistors on PFI |
| Reset-based watchdog timer | Guarantees system recovery via hard reset (not just NMI) after firmware hang - no risk of undetected stuck WDO state |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset assertion during severe brownout, preventing µP execution from corrupted memory or unstable clocks |
| Immunity to short VCC transients | Rejects <100ns supply glitches, avoiding spurious resets in electrically noisy environments like motor-driven white goods |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Monitoring +3.3V I/O supply in embedded network processors during AC line sags or PoE voltage fluctuations. IC Role / Device Role / Timing Role: Supervisory IC providing synchronized active-low and active-high reset signals to CPU and peripheral ASICs while issuing PFO interrupt for graceful link shutdown. Use Value: Prevents packet corruption and PHY lockup by ensuring all logic domains reset coherently before supply collapse. | Use Scenario: Power sequencing and fail-safe reset in enterprise Ethernet switches with multiple voltage rails. IC Role / Device Role / Timing Role: Primary supervisor for main +3.3V rail, using PFI to monitor +12V bias supply via resistor divider and assert PFO to trigger backup DC-DC enable. Use Value: Enables >100ms advance warning before +12V dropout, allowing switch fabric to flush buffers and enter low-power state. |
| White Goods | Telecommunications |
Use Scenario: Reset coordination in smart refrigerator controllers exposed to compressor-induced supply noise. IC Role / Device Role / Timing Role: µP supervisor asserting dual-polarity reset to MCU and display driver ICs; MR connected to door-open sensor for user-initiated reboot. Use Value: Eliminates display ghosting and sensor misreads by holding MCU in reset during 500ms VCC dip caused by compressor startup. | Use Scenario: Power integrity monitoring in LTE base station remote radio units (RRUs) operating in wide temperature ranges. IC Role / Device Role / Timing Role: Critical µP power monitor for FPGA configuration controller; uses watchdog (WDI) to detect firmware stalls and force hardware reset. Use Value: Achieves >99.999% uptime by recovering unresponsive FPGA configuration logic without field technician intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6708SKA+T | No watchdog timer; identical pinout, reset thresholds, PFI/PFO, and dual RESET outputs | Suitable where watchdog functionality is unnecessary or implemented elsewhere (e.g., in µP firmware) | Select MAX6708SKA+T to reduce BOM count if external watchdog or software-based supervision suffices |
| TPS3808G30DBVR | Single active-low open-drain reset; fixed 3.0V threshold; no PFI/PFO or complementary output; 200ms timeout | Lacks power-fail warning and dual-reset capability; requires external pullup and inverter for active-high signal | Choose TPS3808G30DBVR only when design space is constrained and power-fail monitoring is omitted |
Compared with MAX6708SKA+T, MAX6704SKA+T adds watchdog-triggered reset pulses but shares identical packaging, thermal range, and power-fail functionality; versus TPS3808G30DBVR, it provides integrated dual-polarity reset and early power-fail signaling - reducing component count and improving system-level fault response.
Availability
MAX6704SKA+T is available at Aetrix Electronics and suitable for computers, networking infrastructure, white goods, and telecommunications equipment requiring stable component supply across industrial temperature ranges (-40°C to +125°C).
Supply support for MAX6704SKA+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 power management, sensing, and connectivity in demanding industrial and automotive environments.
The MAX6701–MAX6708 family targets cost-sensitive, space-constrained µP systems requiring reliable power monitoring, manual reset, power-fail warning, and watchdog supervision - all in a tiny SOT23 package.
FAQ
What is the reset threshold voltage for MAX6704SKA+T?
The MAX6704SKA+T has a factory-trimmed reset threshold of 3.08V (typical) with ±3% tolerance over -40°C to +125°C, optimized for +3.3V supply supervision. This value is defined by the "S" suffix in the part number and is guaranteed in the Electrical Characteristics table under VTH for MAX670_S/MAX670_AS versions.
Does MAX6704SKA+T provide an independent watchdog output (WDO)?
No, MAX6704SKA+T does not feature a dedicated WDO pin. Instead, its watchdog function is reset-based: a 1.6s timeout on WDI triggers a full reset pulse on both RESET outputs. This differs from MAX6701–MAX6707(A) variants that include a separate WDO pin.
What is the function of the PFI and PFO pins on MAX6704SKA+T?
PFI is a high-impedance input referenced to an internal 0.62V bandgap; connecting it via a resistor divider to a monitored supply allows programmable power-fail detection. PFO is its push-pull active-low output, asserting when PFI falls below 0.62V - enabling early warning interrupts or backup power activation.
Can MAX6704SKA+T monitor multiple supply voltages simultaneously?
No, MAX6704SKA+T monitors only the VCC supply for reset generation. Unlike MAX6701–MAX6703(A) variants, it lacks RST_IN1 and RST_IN2 pins and therefore cannot supervise triple-voltage systems. Its PFI pin supports secondary supply monitoring only for power-fail warning, not for reset assertion.
What package type and environmental rating does MAX6704SKA+T use?
MAX6704SKA+T uses an 8-pin SOT23 package (K8+2 outline), is rated for -40°C to +125°C operation, and is RoHS-compliant and lead(Pb)-free, as indicated by the "+T" suffix per Maxim's ordering guide.
MAX6704SKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6704SKA+T FAQ
1.How can I place an order for MAX6704SKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6704SKA+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 MAX6704SKA+T reliable?
The price and inventory of MAX6704SKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6704SKA+T is usually 5 days.
3.What payment methods are accepted for MAX6704SKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6704SKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6704SKA+T?
MAX6704SKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6704SKA+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 MAX6704SKA+T?
For technical support, including MAX6704SKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6704SKA+T requirements.
6.How does Aetrix verify that MAX6704SKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6704SKA+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 MAX6704SKA+T meets industry standards.
7.What is the process for return or replacement of MAX6704SKA+T?
All MAX6704SKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6704SKA+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 MAX6704SKA+T part is unused and in its original packaging.
Return procedure for MAX6704SKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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