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Analog Devices Inc./Maxim Integrated MAX6704TKA+T
- Part No.:
- MAX6704TKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6704TKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
MAX6704TKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in 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 +3.3V systems (3.08V reset threshold), guarantees valid reset down to VCC = 1V, and supports critical µP power monitoring in industrial embedded controllers.
For engineers reviewing the MAX6704TKA+T datasheet, MAX6704TKA+T pinout, MAX6704TKA+T application, or MAX6704TKA+T equivalent, this device delivers precise voltage supervision, brownout immunity, and integrated power-fail warning for reliable system boot and orderly shutdown in white goods, telecom, and intelligent instrumentation.
Technical Context
The MAX6704TKA+T implements a dual-stage reset generator with independent complementary outputs: one active-low (RESET) and one active-high (RESET) - both push-pull, asserted simultaneously during VCC brownout, power-up, or MR activation. Its power-fail comparator features a 0.62V internal reference and supports external resistor-divider configuration for custom trip points as low as 0.62V on PFI, with sub-1µs PFI-to-PFO delay.
Watchdog functionality is tightly coupled to the reset path: WDI must be toggled within 1.6s (typ) to prevent automatic reset pulse generation; unlike standalone watchdogs, it lacks an independent WDO output but asserts RESET directly. The device operates across -40°C to +125°C and draws only 9–20µA supply current at VCC < 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ) at -40°C to +125°C; precisely monitors +3.3V rails with ±30mV tolerance over full temp range |
| Reset Timeout Period | 140ms (min) to 300ms (max); ensures µP remains held in reset long enough for stable clock and supply settling |
| Power-Fail Input Threshold | 618mV (typ) with 6mV hysteresis; enables early-warning detection of supply droop before main rail fails |
| Supply Current | 9µA (typ) at VCC < 3.6V; ultra-low quiescent draw preserves battery life in always-on monitoring applications |
| Operating Voltage Range | 1.2V to 5.5V; guarantees functional reset assertion even during deep brownout down to 1.2V VCC |
| Watchdog Timeout | 1.6s (typ); provides sufficient margin for µP firmware execution cycles while preventing runaway lockup |
| Reset Output Type | Dual push-pull: active-low RESET and active-high RESET; eliminates need for external inverters or pull-ups |
Pinout & Package
Package: 8-pin SOT23 (K8+2), footprint compatible with industry-standard 2.0mm × 2.1mm land pattern (Maxim outline 21-0078). RoHS-compliant, lead-free, tape-and-reel packaging (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; debounced by 140ms+ reset timeout; forces reset when pulled low |
| 2 VCC | Main supply input | Primary reset monitor input and power source for push-pull outputs; valid operation from 1.2V to 5.5V |
| 3 GND | Ground reference | Common return for all internal comparators, timers, and output drivers; requires low-impedance PCB connection |
| 4 PFI | Power-fail voltage monitor input | High-impedance (±200nA leakage) node tied to 0.62V internal reference; accepts external divider for custom trip points |
| 5 PFO | Power-fail output | Active-low push-pull output; asserts when PFI falls below 0.62V; drives interrupt or backup-enable logic directly |
| 6 N.C. | No connection | Not internally bonded; must remain unconnected per datasheet; no routing or stubs allowed |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 1.2mA at VCC ≥ 2.55V; guaranteed VOL ≤ 0.3V down to VCC = 1.2V |
| 8 RESET | Active-high reset output | Complementary push-pull output; VOH ≥ 0.8×VCC at ISOURCE = 500µA; enables direct interface to µP's active-high reset pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate external level-shifting or inversion circuitry |
| Adjustable power-fail comparator | PFI input with 0.62V internal reference enables configurable early-warning detection of secondary supply collapse |
| Reset-based watchdog timer | 1.6s timeout triggers guaranteed reset pulse without requiring separate watchdog output or external components |
| Guaranteed operation down to VCC = 1.2V | Ensures deterministic reset behavior during severe brownout; RESET remains valid until VCC drops below 1.2V |
| Immunity to short VCC transients | Withstands falling VCC glitches < 10µs duration without spurious reset assertion, improving noise resilience |
Applications
| Industrial Controllers | White Goods |
|---|---|
|
Use Scenario: PLC I/O modules and motor drive controllers require deterministic reset sequencing during AC line sags or DC bus fluctuations. IC Role / Device Role / Timing Role: MAX6704TKA+T monitors main +3.3V logic supply and auxiliary +5V analog rails via PFI divider, asserting dual RESET signals to hold µP and FPGA in known state. Use Value: 140ms minimum reset timeout prevents premature release during transient recovery; dual outputs simplify interface to mixed-signal SoCs with both active-low and active-high reset requirements. |
Use Scenario: Refrigerator control boards use backup supercapacitors to maintain real-time clock and sensor data during brief AC outages. IC Role / Device Role / Timing Role: MAX6704TKA+T's PFI detects falling 3.3V rail and asserts PFO to trigger backup enable, while RESET holds main µP in reset until stable power returns. Use Value: Sub-1µs PFI-to-PFO delay ensures timely backup activation; 0.62V reference allows accurate trip point setting for 3.3V rail with ±3% tolerance. |
| Telecom Line Cards | Intelligent Instruments |
|
Use Scenario: Optical line terminal (OLT) cards experience rapid voltage transients during hot-swap insertion and ESD events. IC Role / Device Role / Timing Role: MAX6704TKA+T provides brownout immunity and glitch rejection on +3.3V management rail, with MR supporting remote reset via service processor. Use Value: Immunity to <10µs VCC transients prevents false resets; MR input supports software-initiated diagnostics without physical access. |
Use Scenario: Portable multimeters and handheld analyzers rely on battery-backed µP operation with strict power-down sequencing. IC Role / Device Role / Timing Role: MAX6704TKA+T monitors main LDO output and uses PFI to detect battery depletion, triggering PFO-driven orderly shutdown before data loss. Use Value: Ultra-low 9µA supply current extends battery runtime; adjustable PFI threshold enables precise end-of-life detection for Li-ion cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6708TKA+T | Omits watchdog timer; identical pinout, reset thresholds, and PFI/PFO functionality | Suitable where watchdog is unnecessary but dual complementary reset and power-fail warning are required | Select MAX6708TKA+T if system-level watchdog is handled externally or not needed; saves design complexity |
| TPS3808G33DBVR | Single active-low open-drain reset; no complementary output or PFO; fixed 3.3V threshold; 200ms timeout | Lacks power-fail warning and dual-reset capability; requires external pull-up and inverter for active-high interface | Choose TPS3808G33DBVR only for cost-sensitive, minimal-feature applications where PFI/PFO and dual outputs are omitted |
Compared with MAX6708TKA+T, the MAX6704TKA+T adds reset-triggered watchdog functionality without changing pinout or supply requirements; versus TPS3808G33DBVR, it delivers integrated power-fail warning, dual reset polarity, and lower quiescent current - enabling more robust, feature-rich supervision in space-constrained designs.
Availability
MAX6704TKA+T is available at Aetrix Electronics and suitable for industrial controllers, white goods, telecommunications infrastructure, and intelligent instrumentation requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6704TKA+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.
The MAX6701–MAX6708 family targets compact, high-reliability µP supervision in space-constrained embedded systems, emphasizing low power, multi-rail monitoring, and integrated fault response - especially for applications where brownout resilience and orderly shutdown are critical.
FAQ
What is the reset threshold voltage for MAX6704TKA+T?
The MAX6704TKA+T has a nominal reset threshold of 3.08V, specified over the full operating temperature range of -40°C to +125°C. This value corresponds to the 'T' suffix in the part number and is optimized for reliable supervision of +3.3V power rails with ±30mV tolerance, ensuring consistent behavior during thermal cycling and voltage drift.
Does MAX6704TKA+T provide both active-low and active-high reset outputs?
Yes, the MAX6704TKA+T provides dual complementary reset outputs: pin 7 is active-low RESET and pin 8 is active-high RESET, both implemented as push-pull drivers. This eliminates the need for external inverters or pull-up resistors when interfacing with µPs or FPGAs that require either polarity, simplifying board layout and reducing BOM count.
How does the watchdog function work in MAX6704TKA+T?
The MAX6704TKA+T implements a reset-based watchdog: if the WDI input is not toggled within 1.6s (typ), it automatically asserts both RESET outputs for the full reset timeout period (140–300ms). Unlike versions with WDO, it has no independent watchdog output - the reset pulse itself serves as the watchdog response, ensuring immediate µP restart without additional signal routing.
Can MAX6704TKA+T monitor voltages other than VCC?
Yes, the MAX6704TKA+T includes a dedicated PFI (power-fail input) pin with an internal 0.62V reference, allowing external resistor dividers to configure monitoring of secondary supplies such as +5V, +2.5V, or battery rails. When PFI falls below the threshold, PFO asserts to signal impending failure - enabling early warning and controlled shutdown before main VCC collapse.
What is the supply current consumption of MAX6704TKA+T?
The MAX6704TKA+T draws only 9µA (typical) when VCC < 3.6V and no load is applied, making it suitable for battery-powered or energy-sensitive applications. This ultra-low quiescent current is guaranteed across the full -40°C to +125°C temperature range and contributes to extended system runtime without compromising supervision accuracy or speed.
MAX6704TKA+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:
- 3.08V, 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
MAX6704TKA+T FAQ
1.How can I place an order for MAX6704TKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6704TKA+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 MAX6704TKA+T reliable?
The price and inventory of MAX6704TKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6704TKA+T is usually 5 days.
3.What payment methods are accepted for MAX6704TKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6704TKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6704TKA+T?
MAX6704TKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6704TKA+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 MAX6704TKA+T?
For technical support, including MAX6704TKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6704TKA+T requirements.
6.How does Aetrix verify that MAX6704TKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6704TKA+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 MAX6704TKA+T meets industry standards.
7.What is the process for return or replacement of MAX6704TKA+T?
All MAX6704TKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6704TKA+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 MAX6704TKA+T part is unused and in its original packaging.
Return procedure for MAX6704TKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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