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Analog Devices Inc./Maxim Integrated MAX6753KA16+
- Part No.:
- MAX6753KA16+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA16+.pdf
- Description:
- MAX6753 UP RESET CKT W/CAPACITOR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6753KA16+ from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 1.575V VCC reset threshold (±2%), capacitor-adjustable reset timeout (tRP = 5.06 × 10⁶ × CSRT), capacitor-adjustable slow watchdog timeout (tWD2 = 0.65 × 10⁹ × CSWT), and dual-mode watchdog fault detection (fast fault tWD1 and slow fault tWD2). It operates across -40°C to +125°C and delivers 3.7µA supply current at VCC ≤ 2.0V.
For engineers reviewing the MAX6753KA16+ datasheet, MAX6753KA16+ pinout, MAX6753KA16+ application, or MAX6753KA16+ equivalent, this page provides verified functional identity, validated SOT23-8 pin mapping, confirmed window watchdog timing behavior, automotive temperature compliance, and real-world selection guidance against comparable supervisory circuits.
Technical Context
The MAX6753KA16+ implements a min/max (windowed) watchdog architecture that asserts RESET when WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault), with tWD1 selectable via SET0/SET1 pinstrapping (8×, 16×, or 64× ratio relative to tWD2). It monitors only VCC (not RESET IN) using a fixed 1.575V ±2% factory-trimmed threshold.
Reset assertion is guaranteed for VCC ≥ 1V, and RESET output is open-drain active-low. The device uses external capacitors on SRT (reset timeout) and SWT (slow watchdog timeout) pins, with ramp-current-based timing generation (200–300nA) and 1.173–1.297V ramp thresholds for both SRT and SWT inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V ±2% (factory-trimmed; enables precise brownout detection at low-voltage rails) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V (supports ultra-low-power battery-backed systems) |
| Operating Temp Range | -40°C to +125°C (fully specified for automotive under-hood and industrial control environments) |
| Reset Timeout | tRP = 5.06 × 10⁶ × CSRT (s); adjustable from ~0.5ms to >10s via SRT capacitor) |
| Slow Watchdog Period | tWD2 = 0.65 × 10⁹ × CSWT (s); sets lower bound of valid WDI pulse window) |
| Fast Watchdog Period | tWD1 = tWD2 / {8, 16, or 64} (selected by SET0/SET1; defines upper bound of valid WDI pulse window) |
| RESET Output Type | Open-drain active-low (supports level-shifting to 0–6V logic domains with external pullup) |
Pinout & Package
MAX6753KA16+ is housed in an 8-pin SOT23-8 package (3.0mm × 1.7mm × 1.3mm), lead-free, with gull-wing leads and standard JEDEC MO-178AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select input | Logic input (HIGH = VCC, LOW = GND) that selects tWD1/tWD2 ratio: LOW/LOW = 8×, LOW/HIGH = 16×, HIGH/HIGH = 64×; HIGH/LOW disables watchdog |
| 2 - SET1 | Watchdog window ratio select input | Second logic input used with SET0 to configure fast watchdog period or disable timer; no internal pullup/pulldown |
| 3 - GND | Ground reference | Analog and digital ground common node; must be low-impedance connection for timing accuracy and noise immunity |
| 4 - VCC | Power supply input | Monitored supply rail (1.2V to 5.5V); powers internal circuitry and enables VCC reset detection at 1.575V threshold |
| 5 - RESET | Open-drain reset output | Active-low signal asserted during VCC brownout, watchdog fault, or manual reset; requires external pullup for logic-level translation |
| 6 - SWT | Slow watchdog timeout capacitor terminal | Connects to ground via low-leakage capacitor (e.g., ceramic) to set tWD2; timing determined by internal 250nA ramp current |
| 7 - SRT | Reset timeout capacitor terminal | Connects to ground via low-leakage capacitor to set tRP; identical ramp architecture as SWT (250nA, 1.235V threshold) |
| 8 - WDI | Watchdog input | Falling-edge-sensitive input; triggers fast/slow fault detection based on timing relative to tWD1/tWD2 window; ignores transitions while RESET is asserted |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both premature (tWDI < tWD1) and delayed (tWDI > tWD2) WDI activity-critical for fail-safe firmware execution in safety-critical systems |
| Capacitor-adjustable timing | Independent SRT and SWT capacitor networks enable precise, board-level tuning of reset and watchdog periods without firmware changes |
| Automotive temperature grade | Full -40°C to +125°C operation with guaranteed timing stability and reset validity ensures reliability in engine control, ADAS, and body electronics |
| Ultra-low quiescent current | 3.7µA at VCC ≤ 2.0V minimizes battery drain in always-on monitoring applications such as telematics and ECU wake-up supervision |
| Open-drain RESET output | Enables flexible interfacing to µP reset inputs powered by different voltage domains (e.g., 1.8V, 3.3V, or 5V) using a single external pullup resistor |
Applications
| Engine Control Unit (ECU) Supervision | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Continuous monitoring of 1.5V–3.3V microcontroller supply in gasoline/diesel engine management units exposed to wide thermal cycling and electrical noise. IC Role / Device Role / Timing Role: Window watchdog enforces strict firmware execution timing; detects stuck loops or clock faults before engine misfire or emission failure occurs. Use Value: Prevents undetected processor lockup during transient load dumps or cold cranking by asserting RESET within 200ns of VCC drop below 1.575V and validating WDI edge timing against tWD1/tWD2 bounds. |
Use Scenario: Safety-critical vision processing unit in lane-departure warning or automatic emergency braking systems requiring deterministic fault response. IC Role / Device Role / Timing Role: Acts as hardware-enforced timing guardrail-rejects both abnormally fast sensor polling (indicating runaway code) and abnormally slow frame processing (indicating hang). Use Value: Guarantees system-level fail-safe behavior by forcing controlled reboot within programmable tRP (e.g., 200ms) upon any watchdog violation, meeting ASIL-B timing constraints. |
| Industrial Programmable Logic Controller (PLC) | Medical Infusion Pump Controller |
|
Use Scenario: Monitoring 2.5V FPGA configuration supply in DIN-rail mounted PLCs operating continuously in factory environments up to +70°C ambient. IC Role / Device Role / Timing Role: Provides dual-layer protection: VCC brownout detection plus windowed watchdog supervision of real-time I/O scan loop. Use Value: Eliminates need for software-based watchdogs vulnerable to compiler optimizations; ensures deterministic recovery from power sags or logic errors without external timing components. |
Use Scenario: Supervising ARM Cortex-M4 core in battery-powered infusion pump where firmware must guarantee precise motor actuation timing and dose delivery integrity. IC Role / Device Role / Timing Role: Hardware watchdog validates that motor control task executes within 100ms–500ms window; prevents overdose due to missed deadlines or infinite loops. Use Value: Meets IEC 62304 Class C software safety requirements by providing independent, analog-timed fault detection path decoupled from main processor clock domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA16+ | Same pinout, same 1.575V VCC threshold, but push-pull RESET output (no external pullup required); lacks SET1 pin (fixed 8× window ratio) | Better suited for designs needing active-drive RESET with minimal BOM count; not suitable where level-shifting or wired-OR reset buses are required | Select MAX6752KA16+ if open-drain flexibility is unnecessary and board space is constrained-same timing, simpler interface |
| TPS3808G15DBVR | Fixed 1.5V reset threshold, no window watchdog (standard timeout only), 1.8–6.0V VCC range, 2.5µA ICC, SOT23-6 package (6-pin, no SET0/SET1/SWT) | Applicable for basic reset + watchdog use cases without min/max timing validation; cannot detect fast-fault conditions | Choose TPS3808G15DBVR for cost-sensitive, non-safety-critical applications where only single-threshold brownout and simple timeout supervision are needed |
Compared with MAX6753KA16+, MAX6752KA16+ offers identical timing and threshold but eliminates open-drain flexibility for lower component count, while TPS3808G15DBVR reduces pin count and cost at the expense of windowed watchdog capability and automotive temperature margin.
Availability
MAX6753KA16+ is available at Aetrix Electronics and suitable for automotive ECU supervision, ADAS domain controllers, industrial PLCs, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA16+ 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 MAX6746–MAX6753 family delivers capacitor-programmable supervisory functions with windowed watchdog capability, targeting safety-critical embedded systems where deterministic fault detection beyond simple timeout is mandatory.
FAQ
What is the exact reset threshold voltage of MAX6753KA16+ and how is it trimmed?
The MAX6753KA16+ features a factory-trimmed VCC reset threshold of 1.575V with ±2% tolerance over -40°C to +125°C. This value is laser-trimmed during production and corresponds to suffix "16" per Table 2 in the datasheet. It does not use external resistors for adjustment-the threshold is fixed and calibrated for direct 1.5V–1.6V rail monitoring.
Does MAX6753KA16+ monitor both VCC and an external voltage via RESET IN?
No. The MAX6753KA16+ monitors only the VCC supply using its fixed 1.575V threshold. It does not include the RESET IN pin found on MAX6748–MAX6751 variants. Its pinout (SET0/SET1/GND/VCC/RESET/SWT/SRT/WDI) confirms absence of RESET IN functionality-dual-voltage monitoring is not supported in this variant.
How do I configure the fast watchdog timeout (tWD1) on MAX6753KA16+?
On MAX6753KA16+, tWD1 is configured by strapping SET0 and SET1 pins: LOW/LOW = 8× ratio, LOW/HIGH = 16×, HIGH/HIGH = 64× relative to tWD2 (set by SWT capacitor). To disable the watchdog entirely, apply HIGH to SET0 and LOW to SET1. No internal pullups exist-external logic or resistors must define these states.
What is the minimum recommended capacitor type and value for SRT and SWT on MAX6753KA16+?
Use low-leakage ceramic capacitors (≤10nA) for both SRT and SWT. For a 200ms reset timeout, CSRT ≈ 39.5nF (tRP = 5.06 × 10⁶ × CSRT). For a 1s slow watchdog period, CSWT ≈ 1.54nF (tWD2 = 0.65 × 10⁹ × CSWT). Values below 100pF or above 0.1µF may degrade timing accuracy due to parasitic effects or leakage.
Is MAX6753KA16+ pin-compatible with MAX6752KA16+?
Yes-MAX6753KA16+ and MAX6752KA16+ share identical SOT23-8 pinout, electrical specifications, and timing architecture. The only functional difference is RESET output type (open-drain vs. push-pull) and presence of SET1 (MAX6753 has it; MAX6752 does not). PCB layout is interchangeable, but firmware or external circuitry must accommodate the RESET drive type.
MAX6753KA16+ 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:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6753KA16+ FAQ
1.How can I place an order for MAX6753KA16+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA16+ 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 MAX6753KA16+ reliable?
The price and inventory of MAX6753KA16+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA16+ is usually 5 days.
3.What payment methods are accepted for MAX6753KA16+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA16+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA16+?
MAX6753KA16+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA16+ 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 MAX6753KA16+?
For technical support, including MAX6753KA16+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA16+ requirements.
6.How does Aetrix verify that MAX6753KA16+ is sourced from the original manufacturer or authorized distributors?
All MAX6753KA16+ 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 MAX6753KA16+ meets industry standards.
7.What is the process for return or replacement of MAX6753KA16+?
All MAX6753KA16+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA16+, 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 MAX6753KA16+ part is unused and in its original packaging.
Return procedure for MAX6753KA16+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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