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Analog Devices Inc./Maxim Integrated MAX6748KA+T
- Part No.:
- MAX6748KA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6748KA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,534
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Product details
Overview
MAX6748KA+T from Analog Devices is a low-power microprocessor supervisory circuit with adjustable reset and watchdog timeout via external capacitors, ±2% factory-trimmed reset threshold of 4.800V (suffix '48'), and AEC-Q100 qualification for automotive use. It monitors a single supply voltage (VCC) or an externally derived voltage (RESET IN), asserts active-low RESET during brownout or manual reset, and guarantees valid reset output down to VCC ≥ 1V. Used in battery-powered controllers and critical μP monitoring where transient immunity and configurable timing are essential.
For engineers reviewing the MAX6748KA+T datasheet, MAX6748KA+T pinout, MAX6748KA+T application, or MAX6748KA+T equivalent, this page delivers verified specifications including capacitor-adjustable reset timeout (5.7–9.5ms), 3.7µA supply current at 2.0V, 8-pin SOT23 package, -40°C to +125°C operation, and dual-mode watchdog support - all confirmed for the exact MAX6748KA+T variant per Analog Devices' official documentation.
Technical Context
The MAX6748KA+T implements a precision voltage monitor with fixed 4.800V VCC reset threshold (±2% over -40°C to +125°C) and supports external RESET IN monitoring via resistor divider. Its reset timeout period (tRP) is set by capacitor CSRT using tRP = 4.94 × 10⁶ × CSRT (seconds), with typical values of 5.692ms (CSRT = 1500pF) and 0.506ms (CSRT = 100pF). The device includes a standard watchdog timer (not windowed) with normal/extended mode selection via WDS pin.
It features push-pull or open-drain RESET output (MAX6748KA+T uses push-pull), manual-reset input disabled (no MR pin), and no SET0/SET1 pins - confirming it belongs to the MAX6748–MAX6751 subgroup with standard watchdog only. The SRT and SWT pins accept external capacitors to independently configure reset and watchdog timeouts, while RESET IN enables dual-voltage monitoring when used with external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.800V ±2% (factory-trimmed); ensures reliable reset assertion at nominal 4.8V rail without external components |
| Supply Current | 3.7µA at VCC ≤ 2.0V; enables ultra-low-power operation in battery-backed systems |
| Reset Timeout Period | 5.692–9.487ms (CSRT = 1500pF); configurable via external capacitor to match µP power-up timing requirements |
| Watchdog Timeout Period | 5.692–9.487ms (normal mode, CSWT = 1500pF); extends to 728.6–1214.4ms in extended mode (WDS = VCC) |
| Operating Temperature | -40°C to +125°C; fully specified for automotive under-hood and industrial embedded environments |
| Package | 8-pin SOT23 (package code K8+5A); surface-mount footprint with 1.6mm × 2.9mm body size and 0.95mm height |
| RESET Output Type | Push-pull active-low; drives high/low without external pull-up, simplifying interface to µP reset inputs |
Pinout & Package
MAX6748KA+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with thermal resistance θJA = 196°C/W on four-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | Adjustable reset comparator input; accepts external resistor-divider to monitor secondary voltage rail |
| 2 | GND | Ground reference for all internal circuits and external timing capacitors |
| 3 | SWT | Watchdog timeout capacitor connection; sets tWD (normal or extended mode) via CSWT |
| 4 | SRT | Reset timeout capacitor connection; sets tRP via CSRT with linear scaling (tRP = 4.94×10⁶ × CSRT) |
| 5 | VCC | Main supply input (1.2V–5.5V); powers device and provides fixed 4.800V VCC reset monitoring |
| 6 | WDI | Watchdog input; falling edge resets watchdog timer; must not float (100kΩ pulldown recommended) |
| 7 | RESET | Push-pull active-low reset output; asserts low during VCC/RESET IN fault or watchdog timeout |
| 8 | WDS | Watchdog select input; GND = normal mode, VCC = extended mode (×128 timeout multiplier) |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.800V reset threshold | ±2% accuracy over full automotive temperature range eliminates need for calibration or trimming resistors |
| Capacitor-adjustable reset timeout | Enables precise matching to µP power-up sequence across diverse designs using single CSRT component |
| Two-mode watchdog timer | Normal (ms-range) or extended (hundreds-of-ms) timeout selectable via WDS pin without firmware change |
| Power-supply transient immunity | Rejects <50µs transients down to 100mV below VTH, reducing false resets in noisy automotive environments |
| AEC-Q100 qualified | Qualified to Grade 0 (-40°C to +125°C), supporting safety-critical automotive ECUs and ADAS subsystems |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V system rail in engine control module exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises VCC and asserts RESET during brownout; provides 7.6ms reset hold time and 728ms extended watchdog timeout. Use Value: Prevents erratic microcontroller behavior during ignition cycles and ensures safe restart after voltage recovery. |
Use Scenario: Ensures fail-safe reset of ARM-based controller in battery-powered infusion pump with strict power budget. IC Role / Device Role / Timing Role: Provides 3.7µA quiescent current and capacitor-tuned 5.7ms reset delay to align with MCU boot sequence. Use Value: Extends battery life while guaranteeing deterministic reset during low-voltage conditions common in portable medical devices. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Guards against firmware lockup in programmable logic controller modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Uses WDI strobing and extended watchdog mode to detect stalled communication stacks. Use Value: Enables autonomous recovery without operator intervention, improving system uptime and maintenance predictability. |
Use Scenario: Monitors main 3.3V supply in revenue-grade meter with tamper-detection firmware requiring guaranteed reset integrity. IC Role / Device Role / Timing Role: Leverages RESET IN pin with resistor divider to simultaneously supervise auxiliary 1.8V sensor rail. Use Value: Supports dual-rail monitoring within single IC, reducing BOM count and PCB area in space-constrained meters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6749KA+T | Open-drain RESET output (vs. push-pull); identical reset threshold (4.800V), timing, and pinout except RESET driver type | Required when interfacing to mixed-voltage systems needing level-shifted reset signaling | Select MAX6749KA+T only if external pull-up to non-VCC rail (e.g., 3.3V) is needed; otherwise MAX6748KA+T simplifies design |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; 1.8µA ICC at 3.3V; no adjustable watchdog; SOT23-6 package (6 pins vs. 8) | Limited to single-rail 3.3V systems without watchdog flexibility or RESET IN monitoring capability | Choose TPS3808G33DBVR for cost-sensitive, low-complexity 3.3V-only applications; MAX6748KA+T retains configurability and dual-monitoring |
Compared with MAX6749KA+T and TPS3808G33DBVR, the MAX6748KA+T uniquely combines factory-trimmed 4.8V supervision, capacitor-adjustable reset/watchdog timing, RESET IN monitoring, and push-pull output in a single 8-pin SOT23 - enabling robust, flexible supervision for automotive and industrial µP systems where timing precision and multi-rail visibility matter.
Availability
MAX6748KA+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and smart energy meter MCUs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6748KA+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision timing, power management, and sensing solutions.
The MAX6748KA+T belongs to the MAX6746–MAX6753 family of microprocessor supervisory circuits, designed specifically for automotive-grade reliability, ultra-low-power operation, and flexible reset/watchdog configuration in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6748KA+T?
The MAX6748KA+T has a factory-trimmed reset threshold voltage of 4.800V with ±2% tolerance over the full -40°C to +125°C temperature range. This value is confirmed by the '48' suffix in the part number and documented in Table 2 of the Analog Devices datasheet. The threshold applies to the VCC supply monitoring function; RESET IN monitoring uses a separate 1.235V internal reference.
Does the MAX6748KA+T support manual reset functionality?
No, the MAX6748KA+T does not include a manual-reset (MR) input. Per the Pin Configurations table and Selector Guide, MR is only present on MAX6746/MAX6747. The MAX6748KA+T uses pins 1 (RESET IN), 3 (SWT), 4 (SRT), 6 (WDI), and 8 (WDS) - omitting MR entirely. Manual reset must be implemented externally via the RESET IN pin using a switch and resistor divider.
What watchdog modes does the MAX6748KA+T support?
The MAX6748KA+T supports normal and extended watchdog modes via the WDS pin. In normal mode (WDS = GND), watchdog timeout is determined by CSWT (e.g., 7.6ms with 1500pF). In extended mode (WDS = VCC), timeout is multiplied by 128 (e.g., 971ms). It does not support windowed watchdog functionality - that is exclusive to MAX6752/MAX6753 variants.
What is the supply current of the MAX6748KA+T at 3.3V?
At VCC = 3.3V and over the full operating temperature range, the MAX6748KA+T draws 4.2µA (minimum) to 9µA (maximum) supply current, with a typical value of 5µA. This ultra-low quiescent current is specified in the Electrical Characteristics table and makes the device suitable for battery-powered applications where standby power is critical.
Can the MAX6748KA+T monitor two voltage rails simultaneously?
Yes, the MAX6748KA+T can monitor two rails: its primary VCC supply (with fixed 4.800V threshold) and a secondary voltage via the RESET IN pin. By connecting an external resistor divider to RESET IN, users set a custom threshold (e.g., 3.3V or 2.5V) using the formula VMON_TH = 1.235V × (R1 + R2)/R2. This dual-monitoring capability is explicitly supported and documented for MAX6748–MAX6751 variants.
MAX6748KA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- 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
MAX6748KA+T FAQ
1.How can I place an order for MAX6748KA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6748KA+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 MAX6748KA+T reliable?
The price and inventory of MAX6748KA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6748KA+T is usually 5 days.
3.What payment methods are accepted for MAX6748KA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6748KA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6748KA+T?
MAX6748KA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6748KA+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 MAX6748KA+T?
For technical support, including MAX6748KA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6748KA+T requirements.
6.How does Aetrix verify that MAX6748KA+T is sourced from the original manufacturer or authorized distributors?
All MAX6748KA+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 MAX6748KA+T meets industry standards.
7.What is the process for return or replacement of MAX6748KA+T?
All MAX6748KA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6748KA+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 MAX6748KA+T part is unused and in its original packaging.
Return procedure for MAX6748KA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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