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Analog Devices Inc./Maxim Integrated MAX6797AKAVDD8+T
- Part No.:
- MAX6797AKAVDD8+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6797AKAVDD8+T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6797AKAVDD8+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626mV reference) with 70ms reset timeout. It features push-pull RST/RST2/PFO outputs, watchdog timer (35s startup / 1.12s normal), manual-reset input, and operates from -40°C to +125°C for industrial power-rail integrity assurance.
For engineers reviewing the MAX6797AKAVDD8+T datasheet, MAX6797AKAVDD8+T pinout, MAX6797AKAVDD8+T application, or MAX6797AKAVDD8+T equivalent, this page delivers verified electrical specs, exact pin functions per variant, real-world multivoltage system use cases, and two validated alternative parts - all grounded in Maxim's official MAX6715A–MAX6729A/MAX6797A family documentation.
Technical Context
This device implements dual independent voltage comparators for VCC1 and VCC2, plus a high-impedance RSTIN comparator referenced to a 626mV internal bandgap. Reset assertion is latched and held for a factory-programmed 70ms minimum timeout after all monitored voltages recover.
The integrated watchdog uses dual-mode timing: a 35s minimum startup window post-reset followed by a 1.12s minimum normal-mode timeout, triggered by WDI edge transitions. All reset outputs are push-pull, referenced to VCC1 (RST, PFO) or VCC2 (RST2), with guaranteed valid logic down to VCC1 or VCC2 = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, L-suffix), ensures reliable reset during 5V rail brownout |
| VCC2 Threshold | 3.075V (factory-trimmed, T-suffix), matches common 3.3V I/O supply monitoring |
| RSTIN Reference | 626mV ±15mV, enables precise third-rail monitoring via external resistor divider |
| Reset Timeout | 70ms (min), D8-suffix, meets boot-time margin requirements for embedded processors |
| Supply Current | 14µA (typ at 3.6V), supports ultra-low-power battery-backed systems |
| Operating Temp | -40°C to +125°C, qualified for under-hood automotive and industrial control environments |
| Watchdog Period | 35s (min startup), 1.12s (min normal), prevents false resets during complex firmware initialization |
Pinout & Package
Package: 8-pin SOT23 (lead-free, RoHS-compliant, tape-and-reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when any monitored voltage fails |
| 2 | GND | System ground reference for all comparators and outputs |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; forces reset on logic-low pulse ≥1µs |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets RST2 reference |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic and sets RST/PFO reference |
| 6 | RSTIN | Adjustable undervoltage monitor input; triggers reset when voltage falls below 626mV reference |
| 7 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts without timeout when PFI < 626mV |
| 8 | RST2 | Active-low push-pull secondary reset output referenced to VCC2; mirrors RST behavior for VCC2 domain |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold monitoring | VCC1 = 4.625V, VCC2 = 3.075V - eliminates external resistor networks for standard rails |
| Externally adjustable third-rail monitor | RSTIN with 626mV reference enables monitoring of any supply ≥0.62V using two resistors |
| Dual-mode watchdog timer | 35s startup + 1.12s normal timeout prevents spurious resets during boot while ensuring runtime fault detection |
| Guaranteed reset validity | Outputs remain functional down to VCC1 or VCC2 = 0.8V - critical for graceful shutdown in deep brownout |
| Push-pull outputs with rail-referenced drive | RST/RST2/PFO drive full rail-to-rail logic levels without external pullups, reducing BOM count |
Applications
| Industrial PLC Power Management | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Monitoring primary 5V MCU core supply, secondary 3.3V I/O rail, and auxiliary 1.8V sensor interface rail in programmable logic controllers. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized reset across domains upon any rail failure, with 70ms timeout ensuring stable boot sequence. Use Value: Eliminates need for three discrete supervisors; 14µA quiescent current extends battery backup runtime during AC loss. |
Use Scenario: Ensuring safe power sequencing and fault response in radar/Ethernet domain controllers exposed to wide temperature swings (-40°C to +125°C). IC Role / Device Role / Timing Role: Monitors 5V pre-regulator, 3.3V CAN transceiver supply, and 1.2V SoC core via RSTIN divider; watchdog guards against firmware lockup. Use Value: Push-pull RST2 referenced to VCC2 guarantees clean reset signaling to isolated 3.3V peripherals without level-shifting. |
| Telecom Line Card Supervision | Medical Imaging Power Sequencing |
Use Scenario: Validating redundant 48V-to-5V/3.3V DC-DC outputs and auxiliary bias supplies in carrier-grade line cards. IC Role / Device Role / Timing Role: Uses RSTIN to monitor -12V analog bias rail; PFO signals early power-fail interrupt to FPGA before main reset asserts. Use Value: 2µs PFI→PFO delay enables deterministic software shutdown; 3mV comparator hysteresis rejects noise on long PCB traces. |
Use Scenario: Coordinating power-up of X-ray detector ASICs requiring strict voltage sequencing (5V → 3.3V → 1.2V) and brownout protection. IC Role / Device Role / Timing Role: VCC1 monitors 5V master rail, VCC2 tracks 3.3V interface rail, RSTIN watches 1.2V core via divider; MR enables service-mode reset. Use Value: Manual-reset input with 1µs pulse width tolerance allows simple front-panel button integration without debounce circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729AUTD8+T | Same 8-pin SOT23 package, identical VCC1/VCC2 thresholds (4.625V/3.075V), same 70ms timeout, but includes PFI/PFO instead of RSTIN | Optimized for power-fail warning (PFI) rather than third-rail monitoring; lacks adjustable RSTIN comparator | Select when early power-loss alert is required instead of auxiliary supply monitoring |
| TPS3808G33DBVR | Single-supply (3.3V only), no RSTIN or PFI, 200ms timeout, SOT23-6 package; lower quiescent current (1.5µA) | Only monitors one rail; no watchdog or manual reset; unsuitable for multivoltage systems | Choose only for cost-sensitive single-rail applications where triple monitoring is unnecessary |
Compared with MAX6729AUTD8+T, the MAX6797AKAVDD8+T provides RSTIN-based third-rail flexibility versus PFI-based power-fail signaling; versus TPS3808G33DBVR, it delivers full triple-supply supervision, watchdog, and manual reset - essential for complex embedded systems requiring coordinated power integrity.
Availability
MAX6797AKAVDD8+T is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS controllers, telecom line cards, medical imaging systems, and set-top boxes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6797AKAVDD8+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, with emphasis on reliability and low-power operation.
The MAX6715A–MAX6729A/MAX6797A product line delivers compact, ultra-low-voltage supervisory circuits for multirail systems where space, power, and thermal robustness are critical - targeting embedded control, infrastructure equipment, and safety-critical subsystems.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6797AKAVDD8+T?
The MAX6797AKAVDD8+T has a factory-trimmed VCC1 reset threshold of 4.625V (L-suffix) and VCC2 threshold of 3.075V (T-suffix), as defined in Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +125°C and include ±1.5% tolerance at 25°C, with 20ppm/°C tempco.
Does the MAX6797AKAVDD8+T support watchdog functionality, and what are its timing modes?
Yes, the MAX6797AKAVDD8+T includes a dual-mode watchdog timer: a 35s minimum startup period after each reset event, followed by a 1.12s minimum normal-mode timeout. The timer clears on any WDI edge transition and asserts RST for the 70ms reset timeout if no transition occurs within the active mode window.
How is the third supply voltage monitored on the MAX6797AKAVDD8+T?
The MAX6797AKAVDD8+T uses the RSTIN pin with a precise 626mV internal reference to monitor a third supply. An external resistor divider scales the target voltage so that the voltage at RSTIN equals 626mV at the desired trip point - for example, a 1.2V rail requires R1/R2 ≈ 0.92 to set VEXT_TH = 1.2V.
What output types does the MAX6797AKAVDD8+T provide, and how are they referenced?
The MAX6797AKAVDD8+T provides push-pull RST (referenced to VCC1), RST2 (referenced to VCC2), and PFO (referenced to VCC1). All outputs drive rail-to-rail logic levels without external pullups. VOL is guaranteed ≤0.4V at 3.2mA sink, VOH ≥0.8×VCC for sourcing.
Can the MAX6797AKAVDD8+T operate reliably during deep supply brownouts?
Yes - the MAX6797AKAVDD8+T guarantees valid reset output logic states down to VCC1 or VCC2 = 0.8V, enabling controlled system shutdown even during severe brownout conditions. Its 14µA typical supply current at 3.6V further extends hold-up time in capacitor-backed systems.
MAX6797AKAVDD8+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:
- 0.788V, 1.575V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6797AKAVDD8+T FAQ
1.How can I place an order for MAX6797AKAVDD8+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6797AKAVDD8+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 MAX6797AKAVDD8+T reliable?
The price and inventory of MAX6797AKAVDD8+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6797AKAVDD8+T is usually 5 days.
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Once your MAX6797AKAVDD8+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 MAX6797AKAVDD8+T?
For technical support, including MAX6797AKAVDD8+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6797AKAVDD8+T requirements.
6.How does Aetrix verify that MAX6797AKAVDD8+T is sourced from the original manufacturer or authorized distributors?
All MAX6797AKAVDD8+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 MAX6797AKAVDD8+T meets industry standards.
7.What is the process for return or replacement of MAX6797AKAVDD8+T?
All MAX6797AKAVDD8+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6797AKAVDD8+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 MAX6797AKAVDD8+T part is unused and in its original packaging.
Return procedure for MAX6797AKAVDD8+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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