My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6753KA29+T
- Part No.:
- MAX6753KA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,931
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6753KA29+T from Analog Devices is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 2.925V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and dual-window watchdog with fast/slow fault detection (tWD1 = 11.4–152ms, tWD2 = 729–1214ms). It operates from 1.2V to 5.5V and is AEC-Q100 qualified for automotive use.
For engineers reviewing the MAX6753KA29+T datasheet, MAX6753KA29+T pinout, MAX6753KA29+T application, or MAX6753KA29+T equivalent, this device supports critical μP monitoring in battery-powered controllers, intelligent instruments, and automotive ECUs where precise timing windows and transient-immune reset assertion are required.
Technical Context
The MAX6753KA29+T implements a min/max (windowed) watchdog architecture that detects both early (faster than tWD1) and late (slower than tWD2) WDI transitions, triggering RESET for the full reset timeout period. Its VCC monitor uses a ±2% factory-trimmed 2.925V threshold with 0.8% hysteresis, guaranteed functional down to VCC ≥ 1V.
Reset and watchdog timeouts are set independently via external capacitors on SRT (CSRT) and SWT (CSWT) pins, using linear scaling formulas: tRP = 4.94×10⁶ × CSRT and tWD2 = 0.65×10⁹ × CSWT. SET0/SET1 pin strapping selects tWD1 ratios (8×, 16×, or 64× relative to tWD2), enabling fine-grained window tuning without firmware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2% (factory-trimmed); ensures reliable brownout detection at nominal 3.3V rail with margin |
| Supply Voltage Range | 1.2V to 5.5V; supports operation across Li-ion, 3.3V, and 5V system rails |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable equipment |
| Reset Timeout Period | 5.69–9.49ms (CSRT = 1500pF); configurable via external capacitor to match μP power-up requirements |
| Slow Watchdog Period (tWD2) | 729–1214ms (CSWT = 1500pF); defines upper bound of valid watchdog window |
| Fast Watchdog Period (tWD1) | 11.4–152ms (SET ratio = 64 to 8); defines lower bound - faults occur if WDI pulses exceed this rate |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive and industrial environments |
Pinout & Package
MAX6753KA29+T is housed in an 8-pin SOT23 package (outline 21-0078), footprint-compatible with industry-standard land pattern 90-0176. The package supports high-density PCB layouts and meets RoHS requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | High-impedance node for external resistor-divider; sets secondary voltage monitoring threshold (1.235V reference) |
| 2 - SET1 | Watchdog window ratio select | Logic input (GND/VCC) selecting tWD1/tWD2 ratio: low/high = 64×, high/low = disabled, low/low = 8× |
| 3 - SWT | Slow watchdog timeout capacitor input | Connects to ground via CSWT to set tWD2; formula tWD2 = 0.65×10⁹ × CSWT (seconds) |
| 4 - SRT | Reset timeout capacitor input | Connects to ground via CSRT to set tRP; formula tRP = 4.94×10⁶ × CSRT (seconds) |
| 5 - GND | Power ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 6 - WDI | Window watchdog input | Falling-edge-triggered; asserts RESET if pulse interval < tWD1 (fast fault) or > tWD2 (slow fault) |
| 7 - RESET | Active-low push-pull reset output | Drives μP reset pin directly; valid logic state guaranteed for VCC ≥ 1V; no external pullup required |
| 8 - VCC | Supply voltage input | Primary power source and monitored rail; absolute max rating = +6.0V; supports 1.2–5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both premature and delayed WDI activity - eliminates false resets from software jitter while catching lockups |
| Factory-trimmed VCC reset threshold | 2.925V ±2% over -40°C to +125°C - removes calibration burden and improves system reliability vs. resistor-based solutions |
| Capacitor-adjustable timing | Independent SRT/SWT pins enable precise, board-level tuning of reset and watchdog periods without firmware updates |
| AEC-Q100 qualification | Qualified for automotive applications - validated for temperature cycling, humidity, and vibration per Grade 0 (-40°C to +125°C) |
| Low supply current | 3.7µA at VCC ≤ 2.0V - extends battery life in portable medical devices and remote sensors |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Real-time motor control and safety-critical dosing logic in harsh under-hood environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Window watchdog monitors WDI strobes from main MCU; asserts RESET if firmware hangs or executes outside expected timing window. Use Value: Prevents uncontrolled motor actuation or incorrect drug delivery by detecting both stuck and runaway code execution. |
Use Scenario: Battery-powered portable infusion pump requiring multi-year operation and fail-safe shutdown on processor fault. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply and provides capacitor-tuned reset timeout matching boot sequence; window watchdog validates pump cycle timing. Use Value: Guarantees safe power-down and prevents overdose errors during brownout or software crash - critical for FDA compliance. |
| Industrial Programmable Logic Controller (PLC) | Smart Energy Meter |
Use Scenario: DIN-rail mounted PLC operating in factory environments with voltage transients and thermal stress. IC Role / Device Role / Timing Role: Monitors 2.5V I/O rail and 3.3V core supply; uses RESET IN pin to track auxiliary sensor supply; window watchdog guards against ladder logic execution faults. Use Value: Maintains deterministic behavior during line surges and ensures controlled recovery without manual intervention. |
Use Scenario: Revenue-grade meter deployed in outdoor utility cabinets with wide ambient temperature range and long service life. IC Role / Device Role / Timing Role: Provides AEC-Q100-grade supervision of metrology SoC; tWD2 tuned to 1-second window aligns with firmware heartbeat interval. Use Value: Ensures accurate energy measurement continuity and prevents data corruption during grid disturbances or firmware anomalies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA32+T | Identical window watchdog architecture and pinout; fixed 3.200V ±2% VCC reset threshold (vs. 2.925V) | Better suited for 3.3V systems requiring tighter margin above nominal rail | Select when monitoring 3.3V supplies where 2.925V threshold risks nuisance resets during normal ripple |
| TPS3808G33DBVR | Single-threshold supervisor with standard watchdog (no window function); 3.08V ±0.5% threshold; 1.8–6.0V supply | Lacks min/max fault detection - cannot distinguish between fast and slow software faults | Choose only for cost-sensitive, non-safety-critical applications where basic reset and timeout sufficiency is confirmed |
Compared with MAX6752KA32+T and TPS3808G33DBVR, the MAX6753KA29+T delivers unique windowed watchdog capability essential for safety-critical firmware validation, while its 2.925V threshold provides optimal headroom for noisy 3.3V rails - making it the preferred choice for automotive and medical systems demanding robust fault discrimination.
Availability
MAX6753KA29+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLCs, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA29+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 and power management solutions.
The MAX6746–MAX6753 family was designed specifically for automotive-grade microprocessor supervision, delivering AEC-Q100-qualified window watchdog functionality, ultra-low quiescent current, and factory-trimmed reset thresholds to simplify system-level reliability engineering.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6753KA29+T?
The MAX6753KA29+T features a factory-trimmed VCC reset threshold of 2.925V ±2% over the full -40°C to +125°C temperature range. This value is confirmed in the Electrical Characteristics table and corresponds to suffix "29" in the ordering guide. The threshold remains stable across supply voltage variations and exhibits 0.8% hysteresis to prevent chatter during brownout recovery. This precise threshold enables reliable supervision of 3.3V systems with adequate noise margin.
How does the window watchdog function differ from a standard watchdog in MAX6753KA29+T?
The MAX6753KA29+T implements a true window watchdog that detects both fast faults (WDI falling edges occurring faster than tWD1) and slow faults (intervals longer than tWD2), unlike standard watchdogs that only detect missed timeouts. This dual-bound detection prevents false resets from software jitter while reliably catching processor lockups or runaway loops. The tWD1 period is selectable via SET0/SET1 pin strapping (8×, 16×, or 64× tWD2), enabling precise alignment with application-specific timing constraints.
Can MAX6753KA29+T monitor two independent supply voltages simultaneously?
No, the MAX6753KA29+T monitors only the VCC supply using its factory-trimmed 2.925V threshold. It does not include dual-voltage monitoring capability like the MAX6750/MAX6751. However, it does provide the RESET IN pin, which accepts an externally derived voltage (e.g., from a resistor divider on a second rail) referenced to a 1.235V internal comparator. This allows indirect monitoring of a second voltage, but the primary VCC supervision remains single-rail only.
What capacitor values are recommended for setting a 100ms slow watchdog period on MAX6753KA29+T?
To achieve a 100ms slow watchdog period (tWD2) on the MAX6753KA29+T, use the formula tWD2 = 0.65 × 10⁹ × CSWT. Solving for CSWT gives CSWT ≈ 154pF. A standard 150pF NP0/C0G ceramic capacitor is recommended due to its low leakage (<10nA) and stable temperature coefficient. Avoid X7R or Y5V types, as their capacitance drift and leakage can cause timing inaccuracy. Place CSWT as close as possible to the SWT pin with short, direct traces to GND.
Is MAX6753KA29+T compatible with 1.8V microcontrollers?
Yes, the MAX6753KA29+T operates from 1.2V to 5.5V and guarantees valid RESET output logic for VCC ≥ 1V, making it fully compatible with 1.8V microcontrollers. Its push-pull RESET output drives high to ≥0.8×VCC when deasserted and low to ≤0.3V when asserted (at ISINK = 50µA), ensuring clean interface to 1.8V logic inputs. Supply current remains ultra-low (≤4.2µA typical) at 1.8V, preserving battery life in portable 1.8V systems.
MAX6753KA29+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:
- 2.925V
- 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
MAX6753KA29+T FAQ
1.How can I place an order for MAX6753KA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA29+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 MAX6753KA29+T reliable?
The price and inventory of MAX6753KA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA29+T is usually 5 days.
3.What payment methods are accepted for MAX6753KA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA29+T?
MAX6753KA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA29+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 MAX6753KA29+T?
For technical support, including MAX6753KA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA29+T requirements.
6.How does Aetrix verify that MAX6753KA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6753KA29+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 MAX6753KA29+T meets industry standards.
7.What is the process for return or replacement of MAX6753KA29+T?
All MAX6753KA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA29+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 MAX6753KA29+T part is unused and in its original packaging.
Return procedure for MAX6753KA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6753KA29+T 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…
