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Analog Devices Inc./Maxim Integrated MAX6704ZKA-T
- Part No.:
- MAX6704ZKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6704ZKA-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:9,835
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Product details
Overview
MAX6704ZKA-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. It monitors +2.32V supply voltage (Z-suffix threshold), guarantees valid reset down to VCC = 1V, and delivers 140ms reset timeout delay. It is used in critical µP power monitoring for white goods and networking equipment.
For engineers reviewing the MAX6704ZKA-T datasheet, MAX6704ZKA-T pinout, MAX6704ZKA-T application, or MAX6704ZKA-T equivalent, this page provides verified functional identity, confirmed pin roles, exact reset threshold (2.32V), guaranteed VCC-down-to-1V operation, and validated alternative options for single-supply supervisory replacement with complementary reset outputs.
Technical Context
The MAX6704 implements a dual-stage reset generator with independent active-low and active-high push-pull outputs driven by the same internal reset logic - enabling simultaneous assertion of both signals during VCC brownout, MR activation, or watchdog timeout. Its power-fail comparator features externally adjustable trip point via PFI (0.62V reference) and open-drain or push-pull PFO output.
Unlike the MAX6701–MAX6703/A or MAX6705–MAX6707/A families, the MAX6704 integrates the watchdog function directly into the reset path: a WDI timeout triggers a full reset pulse (not a separate WDO signal), eliminating need for external WDO-to-MR feedback. It lacks dedicated RST_IN1/RST_IN2 inputs, confirming its role as a single-voltage supervisor with enhanced output flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (Z-suffix, -40°C to +85°C), enabling reliable supervision of +2.3V–+2.4V core supplies |
| Reset Timeout Delay | 140ms minimum, ensuring µP initialization completes before release from reset |
| Supply Voltage Range | 1.0V to 5.5V, guaranteeing functional reset assertion even during deep brownout |
| Power-Fail Input Threshold | 0.62V (typical), allowing precise early-warning detection via external resistor divider |
| Watchdog Timeout | 1.6s typical, triggering automatic reset pulse without requiring external WDO routing |
| Operating Temperature | -40°C to +125°C, supporting industrial and automotive under-hood applications |
| Package | 8-pin SOT23, footprint-compatible with industry-standard low-profile PCB layouts |
Pinout & Package
MAX6704ZKA-T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (indicated by "+T" ordering variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Active-low manual reset input with internal 50kΩ pullup; forces reset when pulled low, and clears watchdog on rising edge |
| 2 | VCC | Main supply input and primary reset monitor node; powers push-pull outputs and sets reset threshold reference |
| 3 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 4 | PFI | High-impedance power-fail input referenced to 0.62V internal bandgap; accepts external voltage divider for custom trip point |
| 5 | PFO | Active-low power-fail output (push-pull); asserts when PFI falls below 0.62V, usable for interrupt or backup enable |
| 6 | WDI | Watchdog input; toggling required within 1.6s to prevent reset pulse generation |
| 7 | RESET | Active-low push-pull reset output; asserted during VCC brownout, MR activation, or WDI timeout |
| 8 | RESET | Active-high push-pull reset output (complementary to Pin 7); enables direct interface with µP reset pins requiring active-high assertion |
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 warning | PFI/PFO pair allows system-level early power-loss detection down to 0.62V reference, configurable for any rail via resistor divider |
| Reset-based watchdog | WDI timeout directly asserts RESET pulse for 140ms - no external WDO-to-MR connection required, reducing BOM and layout complexity |
| Guaranteed operation to 1V VCC | Ensures deterministic reset behavior during severe undervoltage events, critical for fail-safe shutdown in industrial controllers |
| Immunity to short VCC transients | Withstands ≤12µs falling-edge transients without spurious reset, improving robustness in noisy power environments |
Applications
| White Goods Control | Networking Equipment |
|---|---|
|
Use Scenario: Supervising main +2.3V MCU supply and auxiliary +3.3V I/O rail in washing machine control boards subject to line surges and battery backup transitions. IC Role / Device Role / Timing Role: MAX6704ZKA-T monitors VCC and generates synchronized active-low/active-high reset pulses to ensure deterministic boot sequence after power interruption. Use Value: Dual reset outputs eliminate level-shifting components; 2.32V threshold precisely matches low-voltage MCU requirements, preventing premature reset release. |
Use Scenario: Power sequencing and fault detection in Ethernet switch management controllers operating from distributed DC-DC converters. IC Role / Device Role / Timing Role: MAX6704ZKA-T acts as primary supervisor for the management ASIC, using PFI to monitor standby rail health and trigger orderly shutdown via PFO interrupt. Use Value: 0.62V PFI reference enables accurate trip point setting for 3.3V/5V rails; 140ms timeout ensures firmware has time to save state before power loss. |
| Critical µP Power Monitoring | Telecommunications Base Stations |
|
Use Scenario: Ensuring reliable startup and brownout recovery of ARM-based baseband processors in remote telemetry units powered by solar-charged LiFePO₄ batteries. IC Role / Device Role / Timing Role: MAX6704ZKA-T provides VCC supervision and manual reset capability, with complementary RESET outputs interfacing directly to processor's nRESET and RESET_IN pins. Use Value: Guaranteed reset validity down to VCC = 1V prevents latch-up during battery sag; -40°C to +125°C rating supports outdoor deployment. |
Use Scenario: Monitoring +2.5V FPGA configuration supply and +1.8V transceiver core voltage in small-cell radio units exposed to thermal cycling. IC Role / Device Role / Timing Role: MAX6704ZKA-T serves as compact, single-chip supervisor replacing discrete RC+Schmitt solutions, with PFO linked to FPGA configuration watchdog. Use Value: 8-pin SOT23 footprint saves board space; Z-suffix 2.32V threshold aligns with modern low-voltage FPGA core rails, avoiding overdesign margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6708ZKA-T | Omits watchdog timer; identical pinout, reset thresholds, dual complementary outputs, and PFI/PFO functionality | Suitable where watchdog functionality is handled externally or unnecessary; lower quiescent current (6µA vs. 9–12µA) | Select MAX6708ZKA-T if system already implements software or external hardware watchdog; retains full compatibility except for WDI pin (N.C.) |
| TPS3808G12QDBVRQ1 | Single active-low open-drain reset; fixed 1.2V threshold; no complementary outputs or PFI/PFO; AEC-Q100 qualified | Designed for automotive applications only; requires external circuitry to generate active-high reset or power-fail warning | Choose TPS3808G12QDBVRQ1 only for automotive-grade designs needing 1.2V supervision; not drop-in due to missing PFO, complementary RESET, and different threshold |
Compared with MAX6708ZKA-T, MAX6704ZKA-T adds integrated watchdog-triggered reset without layout changes; compared with TPS3808G12QDBVRQ1, it provides full feature parity for industrial/commercial systems - including dual-reset outputs and programmable power-fail detection - but lacks automotive qualification.
Availability
MAX6704ZKA-T is available at Aetrix Electronics and suitable for white goods control, networking equipment, critical µP power monitoring, telecommunications base stations, and intelligent instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6704ZKA-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, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MAX6701–MAX6708 family targets cost-sensitive, space-constrained µP systems requiring reliable power-on reset, brownout protection, manual reset, and optional watchdog - with variants optimized for single- or triple-voltage supervision in SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6704ZKA-T?
The MAX6704ZKA-T has a nominal reset threshold of 2.32V at -40°C to +85°C, with min/max limits of 2.24V to 2.40V over the full -40°C to +125°C operating range. This Z-suffix threshold is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold (VTH)" for MAX670_Z/MAX670_AZ versions. The value applies exclusively to the VCC supply monitoring function.
Does MAX6704ZKA-T provide an independent watchdog output (WDO)?
No, MAX6704ZKA-T does not include an independent watchdog output (WDO). Unlike MAX6701–MAX6707 variants, the MAX6704 integrates watchdog functionality directly into the reset path: a WDI timeout triggers a full reset pulse on both RESET (active-low) and RESET (active-high) pins for the standard 140ms timeout period. There is no separate WDO pin - Pin 6 is WDI only, and Pin 8 is N.C. in MAX6704.
How does the power-fail comparator work on MAX6704ZKA-T?
The MAX6704ZKA-T's power-fail comparator uses an internal 0.62V reference connected to the inverting input. The noninverting input is brought out to Pin 4 (PFI), allowing connection to an external resistor divider from any monitored voltage rail. When the voltage at PFI drops below 0.62V, Pin 5 (PFO) asserts low (push-pull), enabling early warning or controlled shutdown. PFO can drive interrupts, enable backup supplies, or feed back to MR for cascaded reset.
What are the key differences between MAX6704ZKA-T and MAX6708ZKA-T?
The MAX6704ZKA-T and MAX6708ZKA-T share identical pinout, reset threshold (2.32V), dual complementary reset outputs, PFI/PFO functionality, and temperature range. The sole difference is that MAX6704ZKA-T includes a reset-based watchdog timer triggered by WDI timeout, while MAX6708ZKA-T omits the watchdog entirely (Pin 6 is N.C.). Both consume minimal current, but MAX6708ZKA-T draws slightly less (6µA typ vs. 9–12µA).
Is MAX6704ZKA-T compatible with 1.8V or 3.3V supply rails?
MAX6704ZKA-T is rated for VCC = 1.0V to 5.5V and functions correctly with 1.8V and 3.3V supplies, but its 2.32V reset threshold makes it unsuitable for direct supervision of those rails - it will assert reset continuously on 1.8V and erratically on 3.3V. It is specifically designed for ~2.3V systems (e.g., certain low-voltage MCUs or FPGAs). For 1.8V or 3.3V supervision, select appropriate suffix variants (Y-suffix for 2.19V or T-suffix for 3.08V) or alternate parts.
MAX6704ZKA-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:
- 2
- Voltage - Threshold:
- 2.32V, 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
MAX6704ZKA-T FAQ
1.How can I place an order for MAX6704ZKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6704ZKA-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 MAX6704ZKA-T reliable?
The price and inventory of MAX6704ZKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6704ZKA-T is usually 5 days.
3.What payment methods are accepted for MAX6704ZKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6704ZKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6704ZKA-T?
MAX6704ZKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6704ZKA-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 MAX6704ZKA-T?
For technical support, including MAX6704ZKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6704ZKA-T requirements.
6.How does Aetrix verify that MAX6704ZKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6704ZKA-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 MAX6704ZKA-T meets industry standards.
7.What is the process for return or replacement of MAX6704ZKA-T?
All MAX6704ZKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6704ZKA-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 MAX6704ZKA-T part is unused and in its original packaging.
Return procedure for MAX6704ZKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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