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Analog Devices Inc./Maxim Integrated MAX6740XKZWD3+
- Part No.:
- MAX6740XKZWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6740XKZWD3+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:526
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Product details
Overview
MAX6740XKZWD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.313V, VTH2 = 1.665V) and one adjustable RSTIN input (488mV threshold), open-drain RESET output, manual reset detect function, and 150ms minimum reset timeout period. It operates from -40°C to +85°C in a 5-pin SC70 package and is used in multivoltage portable systems to ensure reliable power-on reset and brownout protection.
For engineers reviewing the MAX6740XKZWD3+ datasheet, MAX6740XKZWD3+ pinout, MAX6740XKZWD3+ application, or MAX6740XKZWD3+ equivalent, key selection considerations include its triple-supply monitoring capability, 6µA supply current, SC70 footprint, RSTIN-adjustable threshold down to 0.488V, and manual-reset-detect timing behavior with internal 50kΩ pullup.
Technical Context
The MAX6740XKZWD3+ implements a triple-supply supervisory architecture monitoring VCC1 (2.313V threshold), VCC2 (1.665V threshold), and RSTIN (488mV reference). Reset assertion occurs when any monitored voltage falls below its threshold, and reset remains active for ≥150ms after all voltages recover.
It features an open-drain RESET output with integrated 50kΩ pullup to VCC1 enabling manual reset detection via external pushbutton, plus independent MR input handling with 150ms timeout and 100ns glitch rejection - all within a single 5-pin SC70 package operating at 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.313V ±75mV over -40°C to +85°C - sets primary I/O supply reset point for 2.5V/3.3V rail monitoring |
| VCC2 Threshold | 1.665V ±75mV over -40°C to +85°C - targets core supply monitoring for 1.8V systems |
| RSTIN Threshold | 0.488V ±19mV - enables external resistor-divider to monitor auxiliary voltages as low as 0.5V |
| Reset Timeout | 150ms min - ensures µP initialization completes before release, meeting JEDEC JESD8-12A requirements |
| Supply Current | 6µA typical at +25°C - supports >1-year battery life in coin-cell-powered IoT sensors |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood accessory applications |
| Package | 5-pin SC70 (2.0mm × 1.25mm × 0.9mm) - enables high-density PCB layouts in space-constrained handheld devices |
Pinout & Package
Package: 5-pin SC70 (2.0mm × 1.25mm × 0.9mm, 0.65mm pitch), lead-free (RoHS-compliant), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Asserts low on fault; includes internal 50kΩ pullup to VCC1 for manual reset detect without external components |
| 2 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection to minimize noise coupling |
| 3 - VCC2 | Secondary supply input | Monitors core voltage (e.g., 1.8V); threshold fixed at 1.665V per part suffix ZW |
| 4 - RSTIN | Adjustable reset threshold input | Accepts external divider to monitor third voltage (e.g., 1.2V, 0.9V); 488mV internal reference enables sub-1V detection |
| 5 - VCC1 | Primary supply input | Monitors I/O voltage (e.g., 2.5V, 3.3V); threshold fixed at 2.313V per part suffix ZW |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1 (2.313V), VCC2 (1.665V), and RSTIN (0.488V ref) - eliminates need for three discrete supervisors in multirail SoC designs |
| Manual reset detect | Internal 50kΩ pullup on RESET pin enables direct pushbutton connection without external resistor - reduces BOM count and layout area |
| Low quiescent current | 6µA max ICC1 - extends battery runtime in always-on wearable health monitors and remote sensors |
| SC70 footprint | 2.0mm × 1.25mm body - fits within 3.0mm × 3.0mm keepout zone, ideal for compact GPS modules and Bluetooth LE peripherals |
| Transient immunity | Immune to <35µs transients at 100mV overdrive - prevents spurious resets during switching regulator noise events |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with dual-rail MCU (3.3V I/O, 1.8V core) and analog front-end powered from LDO. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RESET if either rail drops or battery voltage falls below 2.2V via RSTIN divider. Use Value: Guarantees clean boot sequence and prevents corrupted EEPROM writes during brownout - critical for FDA Class II device compliance. | Use Scenario: DIN-rail mounted PLC module with isolated 24V DC input, 5V logic rail, and 3.3V FPGA core. IC Role / Device Role / Timing Role: Monitors 5V rail (VCC1), 3.3V core (VCC2), and auxiliary 12V field power (RSTIN) to coordinate safe shutdown before undervoltage lockout. Use Value: Enables deterministic fail-safe state capture and nonvolatile register save prior to power loss - meets IEC 61131-2 robustness requirements. |
| Automotive Infotainment Head Units | Smart Home Hub Controllers |
Use Scenario: Automotive-grade head unit with 5V USB interface, 3.3V SoC, and 1.2V DDR memory supply. IC Role / Device Role / Timing Role: Supervises 3.3V SoC rail (VCC1), 1.2V DDR rail (VCC2 via RSTIN divider), and ignition-switched 12V (RSTIN) to manage cold-cranking recovery. Use Value: Prevents firmware corruption during engine start transients by holding RESET until all rails stabilize - satisfies AEC-Q100 Grade 2 thermal requirements. | Use Scenario: Wi-Fi/BLE hub with 3.3V MCU, 1.8V radio, and backup coin cell (2.8V) for RTC/sensor wake-up. IC Role / Device Role / Timing Role: Uses VCC1 for main 3.3V rail, VCC2 for 1.8V radio, and RSTIN to monitor coin cell voltage - triggers graceful sleep transition before backup depletion. Use Value: Eliminates need for separate battery monitor IC - reduces cost and board area while maintaining UL 60950-1 safety isolation boundaries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6743XKZWD3+ | Push-pull RESET output (vs. open-drain); no internal RESET pullup; identical thresholds and timing | Requires external pullup for manual reset; better suited for bidirectional µP reset pins needing driven high | Select when interfacing to processors with weak internal pullups or requiring active-high reset signaling via external inverter |
| TPS3808G33DBVR | Dual-supply only (no RSTIN); 3.3V fixed VDD1 threshold; 1.2V adjustable VDD2 via resistor; 200ms timeout | Lacks third-monitoring channel; requires external resistor network for second threshold; higher 12µA supply current | Choose for cost-sensitive dual-rail designs where RSTIN functionality is unnecessary and SC70 size is acceptable |
Compared with MAX6743XKZWD3+, the MAX6740XKZWD3+ provides integrated manual reset detection without external components, while TPS3808G33DBVR offers lower cost but sacrifices triple-supply capability and doubles quiescent current - making MAX6740XKZWD3+ optimal for space-constrained, battery-sensitive triple-rail systems.
Availability
MAX6740XKZWD3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive infotainment head units, and smart home hub controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6740XKZWD3+ 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 industrial, automotive, communications, and consumer applications.
The MAX6736–MAX6745 family delivers ultra-low-power, multi-rail supervisory circuits optimized for battery-operated and space-constrained systems requiring guaranteed reset assertion during brownout, startup, and power-fail conditions.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6740XKZWD3+?
The MAX6740XKZWD3+ has a factory-trimmed VCC1 reset threshold of 2.313V, with ±75mV tolerance over the full -40°C to +85°C operating temperature range. This value is defined by the "ZW" suffix in the part number and is verified per Table 1 of the official Maxim datasheet. The threshold remains stable across supply voltage variations from 1.2V to 5.5V.
Does the MAX6740XKZWD3+ support manual reset functionality, and how is it implemented?
Yes, the MAX6740XKZWD3+ supports manual reset via its open-drain RESET pin, which includes an internal 50kΩ pullup resistor to VCC1. When a momentary switch connects RESET to GND, the device detects the low state and asserts RESET for the full 150ms timeout period after release. No external pullup is required, simplifying design and reducing component count compared to traditional MR-input-only supervisors.
Can the MAX6740XKZWD3+ monitor a 1.2V supply, and what is the lowest voltage it can supervise?
Yes, the MAX6740XKZWD3+ can monitor a 1.2V supply using its RSTIN pin with an external resistor divider. The internal RSTIN reference is 0.488V ±19mV, enabling supervision of voltages as low as 0.5V. For a 1.2V rail, a standard 1MΩ/511kΩ divider yields ~0.488V at RSTIN - allowing precise, low-current monitoring without loading the supply.
What is the supply current consumption of the MAX6740XKZWD3+, and how does it vary with temperature?
The MAX6740XKZWD3+ draws 6µA typical supply current at +25°C, with maximum of 10µA over -40°C to +85°C. Graphs in the datasheet (toc01–toc03) confirm current remains stable across temperature - e.g., 6.2µA at -40°C and 6.8µA at +85°C when VCC1 = 3.3V/VCC2 = 2.5V. This ultra-low, temperature-stable current enables multi-year operation on CR2032 batteries.
Is the MAX6740XKZWD3+ pin-compatible with other devices in the MAX6736–MAX6745 family?
No - the MAX6740XKZWD3+ uses a specific pinout (RESET/GND/VCC2/RSTIN/VCC1) that differs from MAX6736/MAX6737 (RESET/GND/MR/VCC2/VCC1) and MAX6742/MAX6745 (RESET/GND/PFI/PFO/VCC1). While all share the 5-pin SC70 package, pin functions are not interchangeable. Layout must match the MAX6740-specific configuration shown in Figure 15 of the datasheet.
MAX6740XKZWD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6740XKZWD3+ FAQ
1.How can I place an order for MAX6740XKZWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6740XKZWD3+ 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 MAX6740XKZWD3+ reliable?
The price and inventory of MAX6740XKZWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6740XKZWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6740XKZWD3+?
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4.How is shipping managed for MAX6740XKZWD3+?
MAX6740XKZWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6740XKZWD3+ 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 MAX6740XKZWD3+?
For technical support, including MAX6740XKZWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6740XKZWD3+ requirements.
6.How does Aetrix verify that MAX6740XKZWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6740XKZWD3+ 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 MAX6740XKZWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6740XKZWD3+?
All MAX6740XKZWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6740XKZWD3+, 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 MAX6740XKZWD3+ part is unused and in its original packaging.
Return procedure for MAX6740XKZWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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