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Analog Devices Inc./Maxim Integrated MAX6747KA16
- Part No.:
- MAX6747KA16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA16.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:3,066
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Product details
Overview
MAX6747KA16 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-trimmed 1.575V reset threshold, manual reset input (MR), capacitor-adjustable reset and watchdog timeout, and push-pull active-low RESET output. It monitors VCC supply voltage in automotive-grade systems (-40°C to +125°C), asserts reset during brownout or manual trigger, and provides transient-immune supervision for embedded controllers requiring reliable power-on reset and watchdog safety.
For engineers reviewing the MAX6747KA16 datasheet, MAX6747KA16 pinout, MAX6747KA16 application, or MAX6747KA16 equivalent, this device is selected for critical µP monitoring where adjustable timing, guaranteed RESET validity down to VCC ≥1V, ±2% threshold accuracy, and automotive temperature compliance are mandatory design requirements.
Technical Context
The MAX6747KA16 implements dual-supervision logic: VCC monitoring via internal 1.575V ±2% comparator and external manual reset assertion via MR pin, which is internally pulled up to VCC and rejects <100ns glitches. Reset timeout (tRP) and watchdog timeout (tWD) are independently set using external capacitors CSRT and CSWT, with tRP = 5.06×10⁶ × CSRT (seconds).
It belongs to the MAX6746–MAX6753 family featuring normal-mode watchdog (no windowing), WDS-controlled 128× timeout extension, and push-pull RESET output guaranteed functional at VCC ≥1V. Unlike MAX6746, MAX6747KA16 includes MR but excludes RESET IN - confirming its role as a single-supply VCC monitor with operator-initiated reset capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.575V ±2% (factory-trimmed, fixed for MAX6747KA16) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables ultra-low-power battery-backed operation |
| Operating Temperature | -40°C to +125°C - fully specified for automotive under-hood applications |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF) - supports µP initialization timing across diverse clock domains |
| Watchdog Timeout Range | 0.506ms to 9.487ms (normal mode, CSWT = 100pF to 1500pF); extended to 64.77ms–1214.4ms with WDS high - accommodates firmware service intervals from fast-boot to deep-sleep modes |
| RESET Output Type | Push-pull active-low - eliminates external pull-up resistor, ensures clean logic-level drive into µP reset pin |
| VCC Validity for RESET | Guaranteed correct logic state for VCC ≥ 1V - ensures deterministic reset behavior during brownout recovery |
Pinout & Package
MAX6747KA16 is housed in an 8-pin SOT23 package (JEDEC MO-178AA), footprint-compatible with industry-standard 2.0mm × 2.1mm surface-mount assembly. Pin 1 is marked with a dot; pin numbering follows standard counterclockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Internally pulled up to VCC; falling edge >1µs asserts RESET; immune to <100ns transients - enables direct switch connection without debouncing |
| 2 (SWT) | Watchdog Timeout Input | Capacitor-to-ground sets basic watchdog period (tWD); connect to GND to disable watchdog - defines software service window |
| 3 (SRT) | Reset Timeout Input | Capacitor-to-ground sets reset pulse duration (tRP); determines minimum µP hold time after power stabilization |
| 4 (GND) | Ground Reference | Primary return path for all internal comparators, timers, and output driver - must be low-impedance |
| 5 (WDS) | Watchdog Select Input | Logic input: GND = normal mode (tWD), VCC = extended mode (128×tWD); state change clears watchdog timer |
| 6 (WDI) | Watchdog Input | Falling edge within tWD clears watchdog; absence triggers RESET - used for periodic firmware "kick" |
| 7 (RESET) | Active-Low Reset Output | Push-pull driver; sinks current when asserted, sources weakly when deasserted - directly interfaces µP reset pin |
| 8 (VCC) | Supply Voltage Input | Power source and monitored rail; operates from 1.2V to 5.5V; RESET valid down to VCC = 1V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.575V reset threshold | ±2% accuracy over -40°C to +125°C - eliminates external resistor divider, reduces BOM count and layout area |
| Capacitor-adjustable reset timeout | Configurable from 0.5ms to 9.5ms using 100pF–1500pF ceramic capacitor - matches µP power-up timing without firmware dependency |
| Manual reset input with internal pull-up | No external components required; 1µs minimum pulse width and 100ns glitch rejection - simplifies front-panel or diagnostic reset implementation |
| 128× watchdog timeout extension | WDS pin selects extended mode - enables long watchdog windows for low-duty-cycle firmware while retaining short-window safety during debug |
| Power-supply transient immunity | Withstands 100mV VCC undershoot for ≤50µs without false reset - improves reliability in noisy automotive electrical environments |
| Push-pull RESET output | Eliminates need for external pull-up resistor - reduces component count, avoids I²R drop issues, and ensures robust drive into capacitive µP reset loads |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC CPU Module |
|---|---|
Use Scenario: Supervises 3.3V microcontroller power rail during cold-cranking and load-dump events in engine management systems. IC Role / Device Role / Timing Role: Monitors VCC for brownout; asserts RESET if voltage drops below 1.575V; provides 5ms reset pulse to ensure full µP core initialization before code execution. Use Value: Prevents erratic ECU behavior during battery voltage sag by guaranteeing deterministic reset assertion with ±2% threshold stability across -40°C to +125°C. |
Use Scenario: Ensures safe startup and runtime watchdog supervision of ARM-based controller in programmable logic controller backplane. IC Role / Device Role / Timing Role: Generates power-on reset pulse and services watchdog via periodic WDI strobes; uses WDS to extend timeout during firmware update sequences. Use Value: Enables dual-mode watchdog operation - short interval (2ms) for normal runtime, extended interval (256ms) for flash programming - without hardware change. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
Use Scenario: Provides fail-safe reset for safety-critical ARM Cortex-M4 in battery-powered infusion pump with isolated power architecture. IC Role / Device Role / Timing Role: Asserts RESET on VCC drop or manual button press (MR); uses push-pull output to drive isolated reset translator; guarantees valid RESET down to VCC = 1V. Use Value: Meets IEC 62304 Class C software safety requirements by eliminating reliance on external pull-ups and ensuring reset integrity during partial power loss. |
Use Scenario: Supervises 1.8V metrology SoC and 3.3V communication MCU in ANSI C12.22-compliant smart meter with tamper detection. IC Role / Device Role / Timing Role: Monitors primary 3.3V rail; uses MR for field-service reset; adjusts tRP via SRT capacitor to match SoC wake-up latency after power restoration. Use Value: Reduces bill-of-materials by integrating precise reset timing, manual reset, and watchdog in single 8-pin SOT23 - critical for space-constrained meter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA16 | No manual reset (MR) input; identical 1.575V threshold, SOT23-8, push-pull RESET | Suitable only where operator-initiated reset is unnecessary - e.g., sealed industrial modules | Select MAX6746KA16 if MR functionality is unused and board space allows removal of MR switch routing |
| TLV809E16DBVR | Fixed 1.6V threshold (±1%), no watchdog, no MR, open-drain RESET, 5µA ICC | Lacks timing adjustability and fault-detection features - limited to basic power-on reset only | Choose TLV809E16DBVR for cost-sensitive, non-safety-critical applications where watchdog and manual reset are omitted |
Compared with MAX6746KA16 and TLV809E16DBVR, MAX6747KA16 uniquely delivers integrated manual reset, capacitor-tunable timing, and automotive-grade operation in one chip - making it the only option when field-serviceability, firmware watchdog coverage, and AEC-Q100-aligned reliability are jointly required.
Availability
MAX6747KA16 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC CPU modules, medical infusion pump controllers, and smart energy meter MCUs requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX6747KA16 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 medical applications, emphasizing reliability, low power, and integration.
The MAX6747KA16 belongs to the MAX6746–MAX6753 supervisory family, engineered specifically for automotive and industrial µP systems needing configurable reset timing, manual reset capability, and robust transient immunity without external components.
FAQ
What is the factory-trimmed reset threshold voltage of MAX6747KA16?
The MAX6747KA16 has a factory-trimmed reset threshold voltage of 1.575V with ±2% tolerance over the full automotive temperature range (-40°C to +125°C). This value is fixed and unadjustable - confirmed by the "16" suffix in the part number per Table 2 of the datasheet. The threshold applies exclusively to the VCC supply rail; MAX6747KA16 does not feature RESET IN functionality.
Does MAX6747KA16 support watchdog timer functionality, and how is it configured?
Yes, MAX6747KA16 supports a capacitor-adjustable watchdog timer in normal and extended modes. Connect a capacitor between SWT and GND to set the base timeout (tWD = 5.06×10⁶ × CSWT seconds); assert WDS high to multiply tWD by 128x. The watchdog is cleared by falling edges on WDI or any RESET assertion. MAX6747KA16 does not implement windowed watchdog logic - that feature is exclusive to MAX6752/MAX6753.
What is the function of the MR pin on MAX6747KA16, and what design considerations apply?
The MR (Manual Reset) pin on MAX6747KA16 is an active-low, internally pulled-up input that asserts RESET when pulled below 0.8V for ≥1µs. It rejects transients <100ns and requires no external pull-up or debounce circuitry. For noise immunity, a 0.1µF capacitor from MR to GND is recommended. This pin distinguishes MAX6747KA16 from MAX6746KA16, which lacks MR functionality.
Is MAX6747KA16 compatible with 1.8V or 2.5V supply rails, and what is its minimum operating voltage?
Yes, MAX6747KA16 operates from VCC = 1.2V to 5.5V and is fully specified down to 1.2V at -40°C to 0°C and 1.0V at 0°C to +125°C. Its 1.575V reset threshold remains accurate across this range, and RESET output is guaranteed valid for VCC ≥1V. At 1.8V or 2.5V supplies, it delivers full functionality including watchdog timing, MR response, and push-pull drive strength.
What package type and lead finish does MAX6747KA16 use, and is lead-free compliance available?
MAX6747KA16 is supplied in an 8-pin SOT23 package (JEDEC MO-178AA) with standard leaded finish. Lead-free compliance is available by specifying the "+T" suffix (e.g., MAX6747KA16/V+T), replacing "-T" in the ordering code. Both versions are qualified for automotive temperature range (-40°C to +125°C) and meet relevant JEDEC moisture sensitivity and reflow standards.
MAX6747KA16 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6747KA16 FAQ
1.How can I place an order for MAX6747KA16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA16 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 MAX6747KA16 reliable?
The price and inventory of MAX6747KA16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA16 is usually 5 days.
3.What payment methods are accepted for MAX6747KA16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA16?
MAX6747KA16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA16 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 MAX6747KA16?
For technical support, including MAX6747KA16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA16 requirements.
6.How does Aetrix verify that MAX6747KA16 is sourced from the original manufacturer or authorized distributors?
All MAX6747KA16 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 MAX6747KA16 meets industry standards.
7.What is the process for return or replacement of MAX6747KA16?
All MAX6747KA16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA16, 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 MAX6747KA16 part is unused and in its original packaging.
Return procedure for MAX6747KA16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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