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Analog Devices Inc./Maxim Integrated MAX6746KA16-T
- Part No.:
- MAX6746KA16-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA16-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:7,960
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Product details
Overview
MAX6746KA16-T from Maxim Integrated is a low-power microprocessor supervisory circuit designed for single-supply voltage monitoring and reset generation in automotive and industrial embedded systems. It features a factory-trimmed 1.575V ±2% VCC reset threshold, capacitor-adjustable 5.7–9.5ms reset timeout (CSRT = 1500pF), and 3.7µA typical supply current at VCC ≤ 2.0V. It asserts an active-low push-pull RESET output during brownout, power-up, or manual reset - critical for reliable boot sequencing in battery-powered controllers.
For engineers reviewing the MAX6746KA16-T datasheet, MAX6746KA16-T pinout, MAX6746KA16-T application, or MAX6746KA16-T equivalent, key selection criteria include its AEC-Q100 qualification, -40°C to +125°C automotive temperature range, 1.575V fixed reset threshold, capacitor-tunable watchdog/reset delays, and SOT23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6746KA16-T implements dual-reset logic: it monitors VCC against a precise 1.575V threshold and supports manual reset via MR input with 1µs minimum pulse width and 100ns glitch rejection. Its reset timeout period (tRP) is set by external capacitor CSRT using tRP = 4.94 × 10⁶ × CSRT, enabling design flexibility across µP boot timing requirements.
This variant belongs to the MAX6746–MAX6753 family's fixed-threshold subgroup (suffix "16" = 1.575V) and lacks windowed watchdog or SET0/SET1 pins - confirming it is a basic watchdog-capable supervisory IC with WDS-selectable extended mode (128× timeout), not a window watchdog device like MAX6752/MAX6753.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2% - factory-trimmed for accurate brownout detection at low-voltage rails |
| Supply Current | 3.7µA (typ) at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered systems |
| Reset Timeout | 5.69–9.49ms (CSRT = 1500pF) - configurable to match µP initialization time without overdesign |
| Watchdog Timeout | 5.69–9.49ms (normal) or 729–1214ms (extended, WDS = VCC) - supports both fast-fault and long-interval supervision |
| Operating Temp | -40°C to +125°C - fully specified for under-hood automotive and industrial control environments |
| RESET Output | Active-low push-pull - eliminates need for external pull-up resistor in most µP interface designs |
| VCC Range | 1.0V to 5.5V - guarantees valid RESET assertion down to 1V, supporting ultra-low-voltage operation |
Pinout & Package
MAX6746KA16-T is housed in an 8-pin SOT23 package (package code K8+5, outline 21-0078), optimized for high-density PCB layouts and automotive thermal cycling reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input with internal 12–28kΩ pull-up; initiates reset when pulled low ≥1µs - enables hardware reset button or system-level fault signaling |
| 2 | WDS (Watchdog Select) | Logic input selecting normal (GND) or extended (VCC) watchdog timeout - provides 128× range extension without changing capacitor |
| 3 | SWT (Watchdog Timeout) | Capacitor-connected node setting watchdog period (tWD = 4.94×10⁶ × CSWT) - allows software-timing alignment without firmware changes |
| 4 | SRT (Reset Timeout) | Capacitor-connected node setting reset hold time (tRP = 4.94×10⁶ × CSRT) - ensures µP completes power-rail stabilization before release |
| 5 | GND | Ground reference for all analog comparators and digital logic - must be low-impedance connection to avoid threshold shift |
| 6 | WDI (Watchdog Input) | Falling-edge-triggered input; resets watchdog timer on each transition - requires µP firmware to strobe within timeout window |
| 7 | RESET | Active-low push-pull output; drives µP reset pin directly - no external pull-up needed; sinks 50µA @ 0.3V max VOL |
| 8 | VCC | Main supply input; powers internal comparators, timers, and RESET driver - also monitored for 1.575V threshold violation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed 1.575V Threshold | ±2% accuracy over -40°C to +125°C eliminates calibration overhead and improves system-level voltage margin |
| Capacitor-Adjustable Timing | Independent SRT and SWT pins enable precise, layout-based tuning of reset and watchdog periods without firmware updates |
| AEC-Q100 Qualified | Qualified for automotive applications per stress test requirements - supports functional safety–related monitoring in ASIL-B systems |
| Power-Supply Transient Immunity | Rejects <50µs transients at 100mV below threshold - prevents spurious resets during load-dump or switching noise events |
| Guaranteed RESET Validity Down to VCC = 1V | Ensures deterministic µP reset state even during deep brownout - critical for fail-safe shutdown sequences |
Applications
| Automotive Body Control Module | Battery-Powered Medical Monitor |
|---|---|
Use Scenario: Monitoring 1.8V MCU supply in door module exposed to cold cranking (4.5V–6V transients) and extended temperature cycling. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting RESET during undervoltage and providing 128× extended watchdog for firmware recovery after CAN bus faults. Use Value: Prevents MCU lockup during voltage sags; 1.575V threshold matches low-dropout regulator output, avoiding false triggers. | Use Scenario: Power management in portable ECG device powered by single Li-ion cell (2.7V–4.2V range) with sleep-mode current optimization. IC Role / Device Role / Timing Role: Single-supply supervisor ensuring clean boot and periodic watchdog verification during sensor acquisition cycles. Use Value: 3.7µA quiescent current extends battery life; push-pull RESET eliminates pull-up resistor, saving board area and BOM cost. |
| Industrial PLC I/O Module | Smart Energy Meter Controller |
Use Scenario: Supervising 3.3V ARM Cortex-M4 core in DIN-rail mounted controller operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors VCC for brownout and accepts MR signal from isolated fault inputs. Use Value: -40°C to +125°C rating ensures reliability at junction temperatures; MR input enables integration with external overcurrent protection circuits. | Use Scenario: Reset coordination between metrology ASIC and host MCU in ANSI C12.22-compliant meter with tamper-detection logic. IC Role / Device Role / Timing Role: Timing-critical reset generator with capacitor-set 8ms timeout matching ASIC boot sequence and watchdog coverage of communication stack. Use Value: Adjustable timeouts prevent race conditions during power-up; 1.575V threshold aligns with auxiliary 1.8V rail used for secure element power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA16-T | Identical electrical specs and pinout; differs only in MR pin placement (Pin 1 vs. Pin 5 in MAX6746) and top-mark (AALO vs. AEDI) | Same automotive-grade supervision; MR pin location change may require minor PCB revision | Select MAX6747KA16-T if MR routing constraints favor bottom-row pin placement |
| TPS3808G16DBVR | Fixed 1.6V reset threshold (vs. 1.575V), 1.8µA IQ, no manual reset input, SOT23-6 package | Lacks MR and watchdog - suitable only for basic reset-only applications without firmware supervision needs | Choose TPS3808G16DBVR where watchdog functionality is unnecessary and lowest quiescent current is prioritized |
Compared with MAX6747KA16-T, the MAX6746KA16-T offers identical supervision performance but places MR on Pin 1 for simplified front-panel switch routing; versus TPS3808G16DBVR, it adds watchdog and manual reset at the cost of 1.9µA higher IQ - making it optimal for systems requiring full µP lifecycle control.
Availability
MAX6746KA16-T is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered medical devices, and industrial PLC modules requiring stable component supply with AEC-Q100 assurance and extended temperature support.
Supply support for MAX6746KA16-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 automotive, industrial, and computing markets, emphasizing reliability, low power, and high integration.
The MAX6746–MAX6753 product line delivers configurable µP supervisors with capacitor-tunable timing and AEC-Q100 qualification - targeting safety-critical embedded systems needing robust power-on reset and runtime fault detection.
FAQ
What is the exact reset threshold voltage of the MAX6746KA16-T?
The MAX6746KA16-T has a factory-trimmed VCC reset threshold of 1.575V with ±2% tolerance over -40°C to +125°C. This value is confirmed in Table 2 (suffix "16") and Electrical Characteristics (VTH = VTH ±2%). It is not adjustable - unlike variants with RESET IN pin, MAX6746KA16-T monitors only VCC against this fixed threshold. The MAX6746KA16-T does not support external resistor-divider configuration for threshold adjustment.
Does the MAX6746KA16-T support windowed watchdog functionality?
No, the MAX6746KA16-T does not support windowed watchdog operation. It belongs to the MAX6746–MAX6751 subgroup, which implements a standard timeout watchdog with WDS-selectable extended mode (128×). Windowed watchdog capability (fast/slow fault detection) is exclusive to MAX6752/MAX6753 variants, which feature SET0/SET1 pins and different pinouts. The MAX6746KA16-T pinout lacks SET0/SET1, confirming its standard watchdog architecture.
What is the recommended capacitor value for a 10ms reset timeout with the MAX6746KA16-T?
Using the formula tRP = 4.94 × 10⁶ × CSRT, a 10ms (0.01s) timeout requires CSRT = 0.01 / 4.94 × 10⁶ ≈ 2024pF. A standard 2000pF (2nF) ceramic capacitor is recommended - it yields ~9.89ms timeout, well within typical tolerance. The MAX6746KA16-T datasheet specifies low-leakage ceramic capacitors for SRT/SWT; X7R or C0G dielectrics ensure stability across temperature and bias.
Can the MAX6746KA16-T operate with a 1.2V supply voltage?
Yes, the MAX6746KA16-T operates with VCC as low as 1.0V per Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.2V, supply current is 4.2–9µA (typ–max), and RESET remains valid (VOL ≤ 0.3V at 50µA sink). However, the 1.575V reset threshold means the device will assert RESET continuously below 1.575V - so it cannot monitor a 1.2V rail. It can only supervise rails ≥1.575V (e.g., 1.8V, 2.5V, 3.3V) while being powered from a separate ≥1.575V source.
Is the MAX6746KA16-T pin-compatible with other MAX6746 variants?
Yes, all MAX6746 variants (e.g., MAX6746KA23-T, MAX6746KA46-T) share identical 8-pin SOT23 pinout and electrical interface - only the reset threshold voltage differs (suffix "23" = 2.3V, "46" = 4.6V). The MAX6746KA16-T can be substituted in designs using other MAX6746 thresholds if the 1.575V trip point meets system requirements; no PCB changes are needed. Footprint and soldering profiles remain identical across the MAX6746 series.
MAX6746KA16-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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- 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
MAX6746KA16-T FAQ
1.How can I place an order for MAX6746KA16-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA16-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 MAX6746KA16-T reliable?
The price and inventory of MAX6746KA16-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA16-T is usually 5 days.
3.What payment methods are accepted for MAX6746KA16-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA16-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA16-T?
MAX6746KA16-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA16-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 MAX6746KA16-T?
For technical support, including MAX6746KA16-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA16-T requirements.
6.How does Aetrix verify that MAX6746KA16-T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA16-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 MAX6746KA16-T meets industry standards.
7.What is the process for return or replacement of MAX6746KA16-T?
All MAX6746KA16-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA16-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 MAX6746KA16-T part is unused and in its original packaging.
Return procedure for MAX6746KA16-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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