My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6747KA46
- Part No.:
- MAX6747KA46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA46.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,022
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6747KA46 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-trimmed 4.625V ±2% VCC reset threshold, manual reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset/watchdog timeout delays. It monitors single-supply systems in automotive environments and asserts reset during brownout, power-up, or manual trigger events. Designed for critical µP monitoring in battery-powered and intelligent instrumentation applications.
For engineers reviewing the MAX6747KA46 datasheet, MAX6747KA46 pinout, MAX6747KA46 application, or MAX6747KA46 equivalent, this device offers verified dual-mode watchdog capability (normal/extended), guaranteed RESET validity down to VCC ≥ 1V, transient-immune reset assertion, and SOT23-8 packaging compatible with high-density automotive PCB layouts.
Technical Context
The MAX6747KA46 implements a fixed-threshold VCC monitor (4.625V ±2%) with hysteresis of 0.8%, manual reset input (MR) with 1µs minimum pulse width and 100ns glitch rejection, and capacitor-programmable reset timeout (tRP = 5.06 × 10⁶ × CSRT). Its watchdog timer operates in normal mode only (no WDS pin), with timeout adjustable via SWT capacitor and cleared by WDI falling edges.
This variant lacks windowed watchdog (no SET0/SET1), extended watchdog select (no WDS), and adjustable RESET IN monitoring - confirming it is a fixed-VCC, MR-enabled, non-windowed member of the MAX6746–MAX6753 family. All specifications are fully characterized over −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2% - factory-trimmed for precise 4.5–4.75V supply monitoring without external resistors |
| Supply Current | 3.7µA at VCC ≤ 2.0V - enables multi-year operation in battery-backed systems |
| Reset Timeout Range | 0.506ms to 9.487ms - set by 100pF–1500pF capacitor on SRT pin for flexible µP initialization timing |
| Watchdog Timeout Range | 0.506ms to 9.487ms - set by 100pF–1500pF capacitor on SWT pin; no extended mode (WDS absent) |
| RESET Output Type | Push-pull active-low - drives µP reset pin directly without external pullup; VOL ≤ 0.4V at 3.2mA sink |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial embedded control |
| Power-Supply Transient Immunity | Rejects 50µs transients ≤100mV below VTH - prevents spurious resets during EMI or load-switching events |
Pinout & Package
Package: 8-pin SOT23-8, surface-mount, lead-free compatible (replace "-T" with "+T" for RoHS-compliant ordering).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Internally pulled up to VCC; assert low ≥1µs to trigger full reset timeout period; rejects 100ns glitches |
| 2 | SWT (Watchdog Timeout Input) | Connect capacitor to GND to set normal-mode watchdog timeout (tWD = 5.06×10⁶ × CSWT); no WDS pin → no extended mode |
| 3 | SRT (Reset Timeout Input) | Capacitor-to-GND sets reset timeout (tRP = 5.06×10⁶ × CSRT); enables precise power-on reset hold time tuning |
| 4 | GND | Ground reference for all internal comparators, timers, and output driver |
| 5 | RESET | Push-pull active-low output; sinks ≥3.2mA at VCC ≥4.5V; valid logic state guaranteed for VCC ≥1V |
| 6 | WDI (Watchdog Input) | Falling-edge-triggered; clears watchdog timer; pulses as short as 300ns accepted; ignored during RESET assertion |
| 7 | VCC | Supply input (1.2V–5.5V) and monitored voltage source; powers internal circuitry and enables VCC threshold detection |
| 8 | NC | No connect - pin 8 is unconnected in MAX6747; not bonded internally |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.625V reset threshold | Eliminates external resistor divider, saving board space and BOM cost while ensuring ±2% accuracy over temperature |
| Capacitor-adjustable reset timeout | Enables precise matching to µP power-on requirements across diverse clock speeds and firmware boot sequences |
| Capacitor-adjustable watchdog timeout | Allows software-timed watchdog servicing without re-spinning hardware; supports 0.5–9.5ms range with standard ceramics |
| Manual reset with integrated pullup | Permits direct switch connection to MR pin-no external resistor or debounce circuit required |
| Guaranteed RESET validity down to VCC = 1V | Ensures deterministic µP reset behavior during brownout recovery, critical for fail-safe automotive subsystems |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V system rail in engine management module exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during VCC dip below 4.625V or manual service trigger; provides 5ms reset hold time. Use Value: Prevents erratic code execution during battery voltage sag; MR pin enables field technician-initiated recalibration. |
Use Scenario: Ensures safe restart after power interruption in battery-operated infusion pump with ARM-based controller. IC Role / Device Role / Timing Role: Fixed-threshold supervisor with 3.7µA quiescent current; reset timeout tuned to bootloader validation time. Use Value: Extends battery life >5 years; push-pull RESET eliminates pullup resistor, reducing leakage path in safety-critical analog section. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Protects programmable logic controller CPU during AC line sags and relay switching noise. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V core supply and accepts MR from front-panel reset button. Use Value: 0.8% hysteresis and 50µs transient immunity prevent nuisance resets in electrically noisy factory environments. |
Use Scenario: Secures metering SoC during grid voltage fluctuations and tamper-induced power cycling. IC Role / Device Role / Timing Role: Resets metering MCU if 5V supply drops below 4.625V; watchdog enforces firmware heartbeat verification. Use Value: Meets IEC 62053-21 anti-tampering requirements via deterministic reset timing and MR-activated secure boot mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA46 | Identical reset threshold (4.625V), same SOT23-8 package, but lacks MR pin - uses RESET IN instead | Requires external resistor divider for manual reset; unsuitable where direct switch interface is needed | Select MAX6747KA46 when board-level manual reset switch integration is required without added components |
| TLV809E46DBZR | Fixed 4.63V reset threshold, 1.8–6V supply, 2.5µA ICC, but no watchdog or MR functionality | Single-function reset IC only; cannot replace MAX6747KA46 in designs requiring watchdog supervision | Choose TLV809E46DBZR only for cost-sensitive, watchdog-free applications needing minimal quiescent current |
Compared with MAX6746KA46 and TLV809E46DBZR, the MAX6747KA46 uniquely combines factory-trimmed 4.625V monitoring, integrated manual reset, and capacitor-adjustable watchdog in one SOT23-8 package - enabling compact, robust µP supervision without design compromises.
Availability
MAX6747KA46 is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6747KA46 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 demanding industrial, automotive, and medical applications.
The MAX6747KA46 belongs to the MAX6746–MAX6753 supervisory family, engineered specifically for fail-safe microprocessor monitoring in harsh environments where supply transients, wide temperature swings, and long-term reliability are critical.
FAQ
What is the exact factory-trimmed reset threshold voltage of the MAX6747KA46?
The MAX6747KA46 has a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over −40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "46", and is implemented without external components. The MAX6747KA46 does not support adjustable RESET IN monitoring - its supervision is strictly fixed-threshold on VCC.
Does the MAX6747KA46 support extended watchdog timeout mode?
No, the MAX6747KA46 does not support extended watchdog timeout mode. Unlike MAX6746–MAX6751 variants with a WDS pin, the MAX6747KA46 lacks WDS functionality - its watchdog operates only in normal mode with timeout determined solely by the SWT capacitor. The MAX6747KA46 datasheet pin configuration confirms pin 5 is NC, not WDS.
What is the function of pin 8 on the MAX6747KA46?
Pin 8 on the MAX6747KA46 is a no-connect (NC) terminal - it is not bonded internally and must remain unconnected on the PCB. This is explicitly stated in the Pin Description table and confirmed by the MAX6747-specific pin configuration diagram, which shows pin 8 as unassigned. Connecting pin 8 may cause undefined behavior.
Can the MAX6747KA46 monitor two supply voltages simultaneously?
No, the MAX6747KA46 monitors only the VCC supply voltage using its fixed 4.625V threshold. It does not include RESET IN functionality (unlike MAX6748–MAX6751) or dual-threshold architecture (unlike MAX6750/MAX6751). The MAX6747KA46 is a single-supply supervisor with manual reset input - dual-voltage monitoring requires a different family member.
What is the minimum VCC voltage at which RESET remains valid for the MAX6747KA46?
The MAX6747KA46 guarantees valid RESET logic state for VCC ≥ 1V. Below 1V, output drive strength degrades significantly. This specification is explicitly stated in the Features list and Electrical Characteristics table. For applications requiring RESET validity down to 0V, an external pulldown resistor is recommended - but only with push-pull output variants like the MAX6747KA46.
MAX6747KA46 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:
- 4.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6747KA46 FAQ
1.How can I place an order for MAX6747KA46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA46 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 MAX6747KA46 reliable?
The price and inventory of MAX6747KA46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA46 is usually 5 days.
3.What payment methods are accepted for MAX6747KA46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA46?
MAX6747KA46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA46 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 MAX6747KA46?
For technical support, including MAX6747KA46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA46 requirements.
6.How does Aetrix verify that MAX6747KA46 is sourced from the original manufacturer or authorized distributors?
All MAX6747KA46 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 MAX6747KA46 meets industry standards.
7.What is the process for return or replacement of MAX6747KA46?
All MAX6747KA46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA46, 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 MAX6747KA46 part is unused and in its original packaging.
Return procedure for MAX6747KA46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6747KA46 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
