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Analog Devices Inc./Maxim Integrated MAX6797AKATWD8+T
- Part No.:
- MAX6797AKATWD8+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6797AKATWD8+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-8
- Quantity:
- Payment:
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Inventory:3,682
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Product details
Overview
The MAX6797AKATWD8+T from Maxim Integrated is an ultra-low-voltage dual/triple microprocessor supervisory circuit in an 8-pin SOT23 package, designed to monitor primary (VCC1) and secondary (VCC2) supply voltages and optionally a third voltage via RSTIN. It asserts active-low reset when any monitored supply falls below its factory-trimmed threshold (e.g., VTH1 = 4.625 V typ, VTH2 = 3.075 V typ), maintains reset for a user-selectable timeout (70 ms min), and operates across –40°C to +125°C. It is used in telecom power management systems requiring reliable brownout detection and watchdog supervision.
For engineers reviewing the MAX6797AKATWD8+T datasheet, MAX6797AKATWD8+T pinout, MAX6797AKATWD8+T application, or MAX6797AKATWD8+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (e.g., 70 ms reset timeout, 1.12 s watchdog normal mode), and validated alternative options - all confirmed against Maxim's official MAX6797A datasheet Rev 6 (7/2019).
Technical Context
The MAX6797AKATWD8+T integrates dual independent voltage comparators for VCC1 (1.58–4.63 V thresholds) and VCC2 (0.79–3.08 V), plus a high-impedance RSTIN input referenced to a 626.5 mV internal bandgap. Its reset logic combines OR-ed fault conditions (VCC1/VCC2 undervoltage, MR assertion, WDI timeout) with a deterministic 70 ms minimum reset timeout (D8 suffix) and guaranteed reset validity down to VCC1 or VCC2 = 0.8 V.
It implements a dual-mode watchdog timer: a 35 s minimum startup period after reset, followed by a 1.12 s minimum normal timeout triggered by WDI edge transitions. The device supports push-pull RST/RST2/PFO outputs (referenced to VCC1/VCC2 respectively) and includes a power-fail comparator (PFI/PFO) with 2 µs propagation delay and 3 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 70 ms (min) - ensures sufficient hold time for μP initialization before release |
| VCC1 Reset Threshold | 4.625 V (typ) - factory-trimmed for precise 5 V rail monitoring with ±1.25% tolerance |
| VCC2 Reset Threshold | 3.075 V (typ) - factory-trimmed for accurate 3.3 V rail supervision |
| RSTIN Threshold Voltage | 626.5 mV (typ) - enables external resistor-divider to monitor auxiliary supplies down to 0.62 V |
| Watchdog Normal Timeout | 1.12 s (min) - provides rapid fault detection during steady-state μP operation |
| Supply Current | 14 µA (typ at 3.6 V) - minimizes quiescent load in battery-backed or low-power systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments |
Pinout & Package
MAX6797AKATWD8+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with thermal resistance θJA = 180°C/W on multilayer board. Pin functions are confirmed per Maxim's Pin Description table for MAX6728A/MAX6729A/MAX6797A variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input with internal 50 kΩ pullup to VCC1; forces reset when pulled low |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and RST2 output; sets VCC2 reset threshold range (0.79–3.08 V) |
| 5 | VCC1 | Primary supply input powering core logic and VCC1 comparator; sets VCC1 reset threshold range (1.58–4.63 V) |
| 6 | WDI | Watchdog input; reset triggered if no edge occurs within 1.12 s (normal mode) after initial 35 s startup window |
| 7 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts when PFI < 626.5 mV, deasserts immediately without timeout |
| 8 | PFI | Power-fail comparator input; monitors external supply via resistor divider; 2 µs propagation delay to PFO |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (1.58–4.63 V) and VCC2 (0.79–3.08 V) with separate thresholds and hysteresis |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5 mV reference enables precise monitoring of auxiliary rails (e.g., 1.2 V, 1.8 V) using resistor dividers |
| Dual-mode watchdog timer | 35 s startup window allows full system boot; 1.12 s normal timeout ensures rapid response to software hangs |
| Guaranteed reset validity at low VCC | Reset output remains valid even when VCC1 or VCC2 drops to 0.8 V - critical for brownout recovery |
| Immunity to short VCC transients | Withstands negative-going glitches ≤20 µs (at 100 mV overdrive), reducing false resets in noisy power environments |
| Low quiescent current | 14 µA typical supply current at 3.6 V enables use in always-on, energy-constrained applications |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5 V primary and 3.3 V secondary rails in a base station power management unit with watchdog supervision of control firmware. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-low RST to ARM Cortex-M7 during undervoltage; PFO triggers early shutdown interrupt via GPIO. Use Value: Prevents corrupted register writes during brownout; 70 ms reset timeout aligns with FPGA configuration time. |
Use Scenario: Supervising 24 V DC-DC converted 5 V and isolated 3.3 V supplies in a DIN-rail mounted PLC module operating at 85°C ambient. IC Role / Device Role / Timing Role: Fault detector generating reset pulse on VCC1/VCC2 sag; MR input enables field-service forced reboot via front-panel button. Use Value: –40°C to +125°C rating ensures reliability in uncooled enclosures; 0.8 V reset validity guarantees clean restart during deep brownouts. |
| Automotive Infotainment Head Unit | Battery-Powered Medical Sensor Hub |
Use Scenario: Validating 5 V main and 3.3 V MCU core supplies in an AEC-Q100-aligned infotainment head unit with CAN interface. IC Role / Device Role / Timing Role: Dual-supply monitor with WDI connected to CAN controller TX line; RST2 output drives safety-critical reset domain. Use Value: Watchdog detects CAN bus lockup; push-pull RST2 referenced to VCC2 ensures correct logic level for 3.3 V domain. |
Use Scenario: Managing power integrity in a portable ECG sensor hub powered by Li-ion battery with buck-boost regulation to 3.3 V and 1.8 V. IC Role / Device Role / Timing Role: Triple-monitoring via RSTIN to track battery voltage (via divider); low 14 µA ICC extends runtime between charges. Use Value: RSTIN threshold set to 3.0 V (using 626.5 mV ref) enables graceful shutdown before battery cutoff; 70 ms timeout avoids premature wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6795AKATWD8+T | Same 8-pin SOT23 package and D8 reset timeout, but VCC1 threshold = 3.075 V (T-suffix) and VCC2 = 2.925 V (S-suffix) | Optimized for 3.3 V/2.5 V dual-rail systems instead of 5 V/3.3 V; lacks PFI/PFO functionality | Select when monitoring lower-voltage rails without power-fail warning capability |
| MAX6316LUK46D3+T | Single-supply supervisor (VCC only), 4.63 V threshold, 200 ms reset timeout, SOT23-5 package, no WDI or PFI | Provides basic reset for simple 5 V systems; no dual/third-voltage monitoring or watchdog | Select for cost-sensitive, space-constrained designs needing only primary rail supervision |
Compared with MAX6797AKATWD8+T, MAX6795AKATWD8+T offers matched package and timing but reduced voltage coverage and no PFI/PFO, while MAX6316LUK46D3+T sacrifices monitoring depth and feature set for minimal footprint and BOM count.
Availability
MAX6797AKATWD8+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, automotive infotainment, and portable medical devices requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX6797AKATWD8+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, sensing, and connectivity applications, with emphasis on high-reliability industrial and automotive markets.
The MAX6715A–MAX6729A/MAX6797A family delivers ultra-low-voltage μP supervisory circuits targeting multivoltage systems where simultaneous monitoring of primary, secondary, and auxiliary rails - with integrated watchdog and power-fail detection - is essential for system robustness.
FAQ
What is the reset timeout period for MAX6797AKATWD8+T?
The MAX6797AKATWD8+T has a factory-set minimum reset timeout period of 70 ms (D8 suffix), guaranteed over –40°C to +125°C. This duration ensures μP and peripheral initialization completes before reset release. The timeout begins when all monitored supplies (VCC1, VCC2, RSTIN) rise above their thresholds, MR returns high, or WDI resets the watchdog timer.
Does MAX6797AKATWD8+T support triple-voltage monitoring?
Yes, MAX6797AKATWD8+T supports triple-voltage monitoring: VCC1 and VCC2 are directly monitored internal supplies, and the RSTIN pin accepts an externally divided voltage referenced to a 626.5 mV internal bandgap. By selecting appropriate resistor values, users can set a precise third threshold - for example, 1.2 V or 1.8 V - enabling comprehensive multirail supervision in a single IC.
What is the function of the PFI and PFO pins on MAX6797AKATWD8+T?
On MAX6797AKATWD8+T, PFI is the noninverting input to a dedicated power-fail comparator with a 626.5 mV threshold; PFO is its active-low push-pull output. When PFI voltage drops below threshold (e.g., due to falling battery voltage), PFO asserts immediately without timeout - ideal for triggering early-warning interrupts or initiating controlled shutdown sequences in systems like medical sensors or telecom equipment.
Can the watchdog timer on MAX6797AKATWD8+T be disabled?
Yes, the watchdog timer on MAX6797AKATWD8+T is disabled by leaving the WDI pin unconnected. An internal 200 nA current source detects the open state. If WDI must be driven, ensure external sources sink less than 50 nA to avoid interfering with detection. When enabled, WDI requires edges (rising or falling) at least every 1.12 s in normal mode after the initial 35 s startup window.
What package type and pin count does MAX6797AKATWD8+T use?
MAX6797AKATWD8+T uses an 8-pin SOT23 package (package code K8SN+1, JEDEC outline 21-0078). It is not a 5-pin or 6-pin variant - the "8" in the part number explicitly denotes the 8-pin configuration, which accommodates all eight functional terminals: RST, GND, MR, VCC2, VCC1, WDI, PFO, and PFI.
MAX6797AKATWD8+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:
- -
MAX6797AKATWD8+T FAQ
1.How can I place an order for MAX6797AKATWD8+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6797AKATWD8+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 MAX6797AKATWD8+T reliable?
The price and inventory of MAX6797AKATWD8+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6797AKATWD8+T is usually 5 days.
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MAX6797AKATWD8+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6797AKATWD8+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 MAX6797AKATWD8+T?
For technical support, including MAX6797AKATWD8+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6797AKATWD8+T requirements.
6.How does Aetrix verify that MAX6797AKATWD8+T is sourced from the original manufacturer or authorized distributors?
All MAX6797AKATWD8+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 MAX6797AKATWD8+T meets industry standards.
7.What is the process for return or replacement of MAX6797AKATWD8+T?
All MAX6797AKATWD8+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6797AKATWD8+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 MAX6797AKATWD8+T part is unused and in its original packaging.
Return procedure for MAX6797AKATWD8+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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