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Analog Devices Inc./Maxim Integrated MAX6753KA29/V+T
- Part No.:
- MAX6753KA29/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA29/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
The MAX6753KA29/V+T from Analog Devices is an automotive-grade microprocessor supervisory circuit with fixed 2.925V VCC reset threshold, window watchdog timer, and push-pull active-low RESET output. It monitors VCC supply voltage, asserts reset on brownout or manual trigger, and detects processor timing faults via fast/slow watchdog windows. Designed for battery-powered controllers and critical μP monitoring in harsh environments.
For engineers reviewing the MAX6753KA29/V+T datasheet, MAX6753KA29/V+T pinout, MAX6753KA29/V+T application, or MAX6753KA29/V+T equivalent, this page delivers verified electrical parameters, automotive-qualified thermal performance, capacitor-adjustable timeout periods, and precise window watchdog behavior per AEC-Q100 Class 0 specification.
Technical Context
The MAX6753KA29/V+T implements a dual-threshold window watchdog: slow fault detection (tWD2) set by CSWT capacitor (e.g., 975ms typical at 1500pF), and fast fault detection (tWD1) selected via SET0/SET1 pin strapping (8×, 16×, or 64× tWD2 ratio). It uses internal ramp comparators (1.235V reference) for SRT/SWT timing and guarantees RESET validity down to VCC = 1V.
Unlike MAX6746–MAX6751, it lacks WDS input and extended-mode watchdog; instead, it relies on SET0/SET1 logic inputs to configure window ratios or disable watchdog. Its fixed 2.925V VCC threshold (±2% over −40°C to +125°C) is factory-trimmed and immune to power-supply transients up to 100mV/50µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2% (factory-trimmed, guaranteed over −40°C to +125°C) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables ultra-low-power battery operation |
| Reset Timeout Period | Adjustable 0.506–9.487ms via CSRT capacitor (4.94×10⁶ × CSRT) |
| Slow Watchdog Period (tWD2) | Adjustable 64.77–1214.4ms via CSWT capacitor (0.65×10⁹ × CSWT) |
| Fast Watchdog Period (tWD1) | Selectable 1.01–151.80ms via SET0/SET1 pin strapping (8×/16×/64× tWD2) |
| Operating Temperature | −40°C to +125°C - fully specified for automotive under-hood applications |
| RESET Output Type | Push-pull active-low - eliminates external pull-up, supports direct μP reset input |
Pinout & Package
Package: 8-pin SOT23 (package code K8+5A), RoHS-compliant, footprint per land pattern 90-0176.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | High-impedance input (1.235V threshold); used for dual-voltage monitoring when paired with external resistor divider |
| 2 - SET1 | Watchdog window ratio select | Logic input: low/high configures tWD1 ratio (8×, 16×, 64×, or disable); no internal pullup |
| 3 - SWT | Slow watchdog timeout capacitor node | Connect CSWT to GND to set tWD2; formula tWD2 = 0.65×10⁹ × CSWT (seconds) |
| 4 - SRT | Reset timeout capacitor node | Connect CSRT to GND to set tRP; formula tRP = 4.94×10⁶ × CSRT (seconds) |
| 5 - GND | Ground reference | Primary return path for all analog and digital functions; must be low-impedance |
| 6 - WDI | Window watchdog input | Falling-edge-triggered; asserts RESET if pulse interval < tWD1 (fast fault) or > tWD2 (slow fault) |
| 7 - RESET | Active-low reset output | Push-pull driver; sinks ≥50µA at VOL ≤ 0.3V (VCC ≥ 1.0V); valid for VCC ≥ 1V |
| 8 - VCC | Power supply input | Operates from 1.2V to 5.5V; powers internal comparators, timers, and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both early (tWDI < tWD1) and late (tWDI > tWD2) processor activity - prevents runaway or stalled firmware |
| Capacitor-adjustable timeouts | Independent tuning of reset (CSRT) and slow watchdog (CSWT) delays without firmware changes |
| AEC-Q100 qualified | Class 0 (−40°C to +125°C) qualification ensures reliability in automotive engine control and ADAS modules |
| Low supply current | 3.7µA max at VCC ≤ 2.0V - extends battery life in portable medical and telematics devices |
| Transient-immune reset | Rejects VCC glitches ≤ 100mV/50µs - avoids spurious resets during load-dump or ignition events |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and validates real-time motor control loop execution. IC Role / Device Role / Timing Role: Provides brownout reset and window watchdog supervision to detect firmware hangs or sensor communication failures. Use Value: Prevents unsafe actuator activation during ECU power transients or software lockup; meets ISO 26262 ASIL-B functional safety requirements. | Use Scenario: Supervises ARM Cortex-M4 in battery-powered infusion pump with strict low-power and safety-critical uptime demands. IC Role / Device Role / Timing Role: Generates reliable power-on reset and enforces tight watchdog window (tWD1 = 15ms, tWD2 = 975ms) on motor control task. Use Value: Ensures pump halts immediately on missed watchdog pulse - eliminating risk of overdose due to firmware stall. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Guards RS-485 communication controller in DIN-rail mounted PLC exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Delivers guaranteed RESET assertion across −40°C to +125°C and detects out-of-window UART polling intervals. Use Value: Maintains deterministic system recovery after voltage sags on 24V DC bus; eliminates field failures from thermal-induced timing drift. | Use Scenario: Supervises metrology SoC in ANSI C12.22-compliant smart meter operating from lithium-thionyl chloride primary cell. IC Role / Device Role / Timing Role: Provides ultra-low-current (3.7µA) reset supervision and window watchdog with tWD1 = 4.05ms (64× ratio) for metrology interrupt service. Use Value: Extends 15-year battery life while ensuring accurate energy measurement resumes within 100ms of power restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA32/V+T | Fixed 3.200V VCC reset threshold (±2%), identical window watchdog architecture and pinout | Suitable where higher VCC trip point required for 3.3V systems with tighter margin | Select when system brownout threshold must be ≥3.2V; same layout and firmware integration |
| TLV809E29DBVR | Single-threshold reset IC (2.93V), no watchdog, SOT-23-3 package, 0.5µA supply current | Lacks window watchdog; only provides basic power-on/brownout reset | Choose only if watchdog functionality is unnecessary and board space is constrained to 3-pin footprint |
Compared with MAX6752KA32/V+T, the MAX6753KA29/V+T offers lower reset threshold for earlier intervention in 2.9V–3.0V systems; versus TLV809E29DBVR, it adds critical window watchdog supervision at cost of higher pin count and supply current - essential for safety-critical firmware validation.
Availability
MAX6753KA29/V+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA29/V+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.
The MAX6746–MAX6753 family was designed specifically for robust microprocessor supervision in automotive and industrial environments - delivering AEC-Q100 qualified reset and advanced window watchdog functionality in minimal 8-pin SOT23 footprint.
FAQ
What is the exact reset threshold voltage of the MAX6753KA29/V+T?
The MAX6753KA29/V+T has a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over the full −40°C to +125°C operating range. This value is confirmed in Table 2 of the datasheet under suffix "29", and applies specifically to the VCC monitor - not the adjustable RESET IN input (1.235V).
Does the MAX6753KA29/V+T support dual-voltage monitoring?
Yes, the MAX6753KA29/V+T supports dual-voltage monitoring via its RESET IN pin (Pin 1), which features a fixed 1.235V threshold. When combined with an external resistor divider on RESET IN, it monitors a second voltage (e.g., 5V rail or analog supply) independently of the 2.925V VCC threshold - enabling simultaneous supervision of two critical rails.
How do I configure the window watchdog timeout periods on the MAX6753KA29/V+T?
Configure the slow watchdog period (tWD2) by connecting capacitor CSWT between Pin 3 (SWT) and GND using tWD2 = 0.65×10⁹ × CSWT. Set the fast watchdog period (tWD1) by strapping Pins 2 (SET1) and 6 (WDI is not used for selection) - SET0 is not present on MAX6753; only SET1 and internal logic determine ratio. For example, SET1 = GND yields tWD1 = 8×tWD2.
Is the MAX6753KA29/V+T pin-compatible with other MAX67xx supervisory circuits?
No - the MAX6753KA29/V+T uses the MAX6752/MAX6753 pinout (SET1 on Pin 2, no WDS), differing from MAX6746–MAX6751 (WDS on Pin 5, no SET1). While both are 8-pin SOT23, function mapping differs: swapping with MAX6749 or MAX6751 requires PCB redesign due to incompatible watchdog control pins and missing manual reset.
What is the minimum VCC voltage at which the MAX6753KA29/V+T guarantees valid RESET output?
The MAX6753KA29/V+T guarantees correct RESET logic state (valid high/low levels) for VCC ≥ 1.0V. Below 1.0V, output drive capability degrades; for applications requiring RESET validity down to 0V, a 100kΩ pulldown resistor from RESET to GND is recommended - but only with push-pull output variants like the MAX6753KA29/V+T.
MAX6753KA29/V+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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6753KA29/V+T FAQ
1.How can I place an order for MAX6753KA29/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA29/V+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/V+T reliable?
The price and inventory of MAX6753KA29/V+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/V+T is usually 5 days.
3.What payment methods are accepted for MAX6753KA29/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA29/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA29/V+T?
MAX6753KA29/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA29/V+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/V+T?
For technical support, including MAX6753KA29/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA29/V+T requirements.
6.How does Aetrix verify that MAX6753KA29/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6753KA29/V+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/V+T meets industry standards.
7.What is the process for return or replacement of MAX6753KA29/V+T?
All MAX6753KA29/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA29/V+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/V+T part is unused and in its original packaging.
Return procedure for MAX6753KA29/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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