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Analog Devices Inc./Maxim Integrated MAX6753KA29
- Part No.:
- MAX6753KA29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA29.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:6,185
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Product details
Overview
MAX6753KA29 from Maxim Integrated is a capacitor-adjustable microprocessor supervisory circuit with window watchdog timer, factory-trimmed 2.925V VCC reset threshold (±2%), and automotive-grade operation from −40°C to +125°C. It monitors VCC only, asserts active-low RESET on voltage drop or watchdog fault, and guarantees valid RESET output for VCC ≥ 1V. Used in battery-powered automotive ECUs requiring robust brownout and timing-fault detection.
For engineers reviewing the MAX6753KA29 datasheet, MAX6753KA29 pinout, MAX6753KA29 application, or MAX6753KA29 equivalent, this page delivers verified technical context, exact pin functions, real-world timeout behavior vs. capacitor values, window watchdog timing boundaries, and validated alternative parts for dual-voltage or manual-reset variants.
Technical Context
The MAX6753KA29 implements a min/max (windowed) watchdog architecture: it triggers RESET if WDI falling edges occur 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). Unlike MAX6746–MAX6751, it lacks WDS and MR pins, and does not support extended-mode or manual reset.
VCC monitoring uses a ±2% factory-trimmed 2.925V threshold; no external resistor divider is used. Reset timeout (tRP) and slow watchdog period (tWD2) are set independently by capacitors CSRT and CSWT respectively, using tRP = 5.06×10⁶ × CSRT and tWD2 = 0.65×10⁹ × CSWT, both with typical accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2% (factory-trimmed, fixed for VCC; no external adjustment) |
| Supply Current | 3.7µA at VCC ≤ 2.0V - enables ultra-low-power battery backup operation |
| Reset Timeout Range | 0.506ms to 9.487ms (set by 100pF–1500pF CSRT capacitor) |
| Slow Watchdog Period (tWD2) | 64.77ms to 1214.4ms (set by 100pF–1500pF CSWT capacitor) |
| Fast Watchdog Period (tWD1) | 1.01ms to 75.89ms (selectable via SET0/SET1: 8×, 16×, or 64× tWD2 ratio) |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive applications |
| RESET Output Type | Open-drain active-low - supports level-shifting to 0–6V logic domains |
Pinout & Package
MAX6753KA29 is housed in an 8-pin SOT23-8 package (JEDEC MO-178AA), footprint-compatible with industry-standard 2.0mm × 2.1mm outline and 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select input | Logic input: LOW/LOW = 8× tWD2; LOW/HIGH = 16×; HIGH/HIGH = 64×; HIGH/LOW = watchdog disabled |
| 2 - SET1 | Watchdog window ratio select input | Paired with SET0 to define fast watchdog timeout ratio; no internal pullup/pulldown |
| 3 - GND | Ground reference | Analog and digital ground common node; must be low-impedance connection to system ground plane |
| 4 - VCC | Power supply input | Monitored supply input (2.925V threshold); operates from 1.2V to 5.5V; powers internal circuitry |
| 5 - RESET | Active-low reset output | Open-drain output; requires external pullup; sinks ≥50µA at VOL ≤ 0.3V (VCC ≥ 1.0V) |
| 6 - SWT | Slow watchdog timeout capacitor terminal | Connects to ground via CSWT capacitor; sets tWD2 per tWD2 = 0.65×10⁹ × CSWT (seconds) |
| 7 - SRT | Reset timeout capacitor terminal | Connects to ground via CSRT capacitor; sets tRP per tRP = 5.06×10⁶ × CSRT (seconds) |
| 8 - WDI | Window watchdog input | Falling-edge-sensitive; detects fast faults (tWDI < tWD1) and slow faults (tWDI > tWD2); ignored during RESET assertion |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both premature (fast) and delayed (slow) processor activity - prevents runaway code and stuck states missed by standard watchdogs |
| Capacitor-adjustable timeouts | Independent tuning of reset delay (CSRT) and slow watchdog period (CSWT) enables precise alignment with µP boot time and software loop timing |
| Factory-trimmed precision threshold | 2.925V ±2% over −40°C to +125°C eliminates calibration overhead and ensures reliable brownout detection without external components |
| Ultra-low quiescent current | 3.7µA at VCC ≤ 2.0V extends battery life in always-on automotive modules such as telematics and sensor nodes |
| Open-drain RESET output | Supports interface to µP reset inputs powered from different rails (0–6V), enabling flexible power-domain partitioning in multi-rail systems |
Applications
| Automotive Engine Control Unit (ECU) | Telematics Control Unit (TCU) |
|---|---|
|
Use Scenario: Monitors 3.3V main supply in engine ECU during cold cranking, where voltage sags below 3.0V for up to 100ms. IC Role / Device Role / Timing Role: VCC supervisor with window watchdog - asserts RESET if supply drops below 2.925V or if µP fails to strobe WDI within tWD1/tWD2 bounds during firmware execution. Use Value: Prevents corrupted flash writes and undefined state during marginal power conditions; eliminates need for discrete RC reset networks and secondary watchdog ICs. |
Use Scenario: Powers continuous GNSS/GSM data logging in parked vehicle; operates from 12V battery via 3.3V LDO with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Low-current supervisor ensuring valid RESET down to VCC = 1V while detecting firmware hangs via windowed WDI timing constraints. Use Value: Enables 10+ year battery life in maintenance-free tracking units; tWD1/tWD2 ratio selection matches variable sleep/wake intervals without firmware modification. |
| Industrial Battery-Powered Sensor Node | Medical Portable Diagnostic Device |
|
Use Scenario: Remote vibration sensor node powered by Li-SOCl₂ battery; wakes every 5 minutes to acquire and transmit data. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET on undervoltage and enforcing strict activity window via tWD1 = 16ms / tWD2 = 1.02s (CSWT = 1000pF, SET0/SET1 = LOW/HIGH). Use Value: Guarantees clean restart after deep discharge events; detects both stuck-in-loop and comms timeout failures that standard watchdogs miss. |
Use Scenario: Handheld ultrasound probe with ARM Cortex-M4 MCU; requires fail-safe reset during battery swap and firmware update sequences. IC Role / Device Role / Timing Role: VCC monitor with guaranteed RESET validity above 1V and window watchdog verifying real-time processing deadlines during image reconstruction. Use Value: Meets IEC 62304 Class C safety requirements by eliminating single-point timing failure modes; open-drain RESET interfaces directly to 1.8V µP reset pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA29 | Same 2.925V VCC threshold and window watchdog, but push-pull RESET output (no external pullup required) | Suitable where µP reset pin requires driven high-level signal and board space prohibits pullup resistor | Select MAX6752KA29 when system-level noise immunity favors active-drive RESET; MAX6753KA29 preferred for multi-rail level shifting. |
| MAX6751KA29 | Includes manual reset (MR) input and dual-voltage monitoring (VCC + RESET IN), but uses standard watchdog (not windowed) | Required where operator-initiated reset or monitoring of auxiliary rail (e.g., 1.8V core) is mandatory | Choose MAX6751KA29 only if MR functionality or second voltage channel is needed; trade-off is loss of window watchdog fault coverage. |
Compared with MAX6753KA29, MAX6752KA29 offers identical supervision and timing but replaces open-drain with push-pull RESET-simplifying layout but limiting voltage-domain flexibility-while MAX6751KA29 adds MR and dual monitoring at the cost of replacing window watchdog with basic timeout, reducing fault-detection capability for timing-critical firmware.
Availability
MAX6753KA29 is available at Aetrix Electronics and suitable for automotive engine control, telematics, industrial sensor nodes, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA29 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 automotive, industrial, and computing applications, with emphasis on reliability and parametric performance.
The MAX6746–MAX6753 family delivers capacitor-programmable µP supervisors targeting automotive and harsh-environment systems needing deterministic reset behavior, transient-immune voltage monitoring, and advanced watchdog coverage beyond simple timeout.
FAQ
What is the exact reset threshold voltage for MAX6753KA29?
The MAX6753KA29 features a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over −40°C to +125°C. This value is fixed and non-adjustable; it corresponds to suffix "29" per Table 2 in the datasheet and is verified across temperature and supply voltage variations.
Does MAX6753KA29 support manual reset functionality?
No, MAX6753KA29 does not include a manual reset (MR) input. Its pinout omits MR and instead provides SET0/SET1 for window watchdog configuration. For manual reset capability, consider MAX6746KA29 or MAX6751KA29, which integrate dedicated MR pins.
How do I calculate the capacitor values for reset and watchdog timeouts on MAX6753KA29?
Use CSRT = tRP / 5.06×10⁶ (tRP in seconds) for reset timeout, and CSWT = tWD2 / 0.65×10⁹ (tWD2 in seconds) for slow watchdog period. For example, a 2ms reset timeout requires CSRT ≈ 395pF; a 500ms tWD2 requires CSWT ≈ 769pF. Ceramic capacitors with leakage <10nA are recommended.
Can MAX6753KA29 monitor two supply voltages simultaneously?
No, MAX6753KA29 monitors VCC only. It lacks RESET IN pin and adjustable threshold circuitry. Dual-voltage monitoring is supported only by MAX6750/MAX6751 variants, which include both factory-trimmed VCC threshold and external RESET IN comparator input.
What is the minimum VCC required for MAX6753KA29 to guarantee valid RESET output?
MAX6753KA29 guarantees correct RESET logic state (valid low/high assertion) for VCC ≥ 1.0V. Below 1.0V, RESET output behavior is not specified; for applications requiring valid RESET down to 0V, a pulldown resistor is incompatible due to its open-drain output structure.
MAX6753KA29 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:
- 2.925V
- 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
MAX6753KA29 FAQ
1.How can I place an order for MAX6753KA29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA29 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 reliable?
The price and inventory of MAX6753KA29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA29 is usually 5 days.
3.What payment methods are accepted for MAX6753KA29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA29?
MAX6753KA29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA29 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?
For technical support, including MAX6753KA29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA29 requirements.
6.How does Aetrix verify that MAX6753KA29 is sourced from the original manufacturer or authorized distributors?
All MAX6753KA29 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 meets industry standards.
7.What is the process for return or replacement of MAX6753KA29?
All MAX6753KA29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA29, 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 part is unused and in its original packaging.
Return procedure for MAX6753KA29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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