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Analog Devices Inc./Maxim Integrated MAX6740XKSHD3+
- Part No.:
- MAX6740XKSHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6740XKSHD3+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
The MAX6740XKSHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 2.188V) and one adjustable RSTIN input (488mV threshold), open-drain RESET output, manual reset detect function, and 150ms minimum reset timeout - designed for multivoltage portable systems requiring precise power sequencing and fault detection.
For engineers reviewing the MAX6740XKSHD3+ datasheet, MAX6740XKSHD3+ pinout, MAX6740XKSHD3+ application, or MAX6740XKSHD3+ equivalent, this device serves as a low-power (6µA), SC70-5 packaged supervisory solution for validating dual-core/I/O supply integrity, enabling pushbutton-initiated system resets with internal debouncing, and supporting voltage-margining via external resistor dividers on RSTIN.
Technical Context
The MAX6740XKSHD3+ monitors three independent supply rails: primary VCC1 (2.925V threshold), secondary VCC2 (2.188V threshold), and user-adjustable RSTIN (488mV reference). It asserts an active-low open-drain RESET when any monitored voltage falls below its threshold and holds reset for ≥150ms after all supplies recover.
Its manual reset detect function uses the RESET pin itself - internally pulled up to VCC1 via 50kΩ - enabling direct connection to a momentary switch without external components; debounce is built-in (37.5–75ms), and MR timeout matches the VCC reset period (150ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.925V ±2.5% - factory-trimmed for reliable I/O supply monitoring at 3.0V nominal rails |
| VCC2 Threshold | 2.188V ±2.5% - factory-trimmed for core supply supervision at 2.2V nominal rails |
| RSTIN Threshold | 0.488V ±1.5% - precision internal reference enabling adjustable monitoring down to 0.5V via resistor divider |
| Reset Timeout | 150ms min - ensures µP reset duration meets boot-loader initialization requirements |
| Supply Current | 6µA typical - enables battery life extension in always-on portable equipment |
| Operating Temp | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Package | 5-pin SC70 - 2.0mm × 1.25mm footprint ideal for space-constrained PCB layouts |
Pinout & Package
MAX6740XKSHD3+ is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is RSTIN (adjustable threshold input), Pin 4 is VCC2 (secondary supply input), and Pin 5 is VCC1 (primary supply input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Internally pulled up to VCC1 via 50kΩ; supports manual reset detect and bidirectional µP interface without contention |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and output drivers; must be low-impedance |
| 3 - RSTIN | Adjustable reset threshold input | Monitors external voltage via resistor divider; asserts RESET when input falls below 0.488V |
| 4 - VCC2 | Secondary supply input | Monitored at 2.188V threshold; used for core voltage supervision in dual-rail systems |
| 5 - VCC1 | Primary supply input | Monitored at 2.925V threshold; powers internal circuitry and provides pullup for RESET and MR functions |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous supervision of VCC1 (2.925V), VCC2 (2.188V), and RSTIN (0.488V) eliminates need for multiple discrete supervisors |
| Manual reset detect on RESET pin | Integrated 50kΩ pullup and 37.5–75ms debounce allow direct pushbutton connection - no external RC or logic required |
| Low 6µA quiescent current | Enables >10-year battery life in coin-cell-powered IoT sensors and wearables with periodic wake-up cycles |
| Factory-trimmed thresholds | ±2.5% accuracy over -40°C to +85°C avoids calibration overhead in production test and field operation |
| SC70-5 package | 2.0mm × 1.25mm footprint reduces board area by >60% vs. SOT23-5, critical for ultra-thin handhelds |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meter with dual-rail MCU (3.0V I/O, 2.2V core) and analog front-end requiring clean power-up sequencing. IC Role / Device Role / Timing Role: Supervises VCC1 (3.0V rail), VCC2 (2.2V rail), and RSTIN (0.5V LDO enable signal); asserts RESET until both supplies stabilize for ≥150ms. Use Value: Prevents firmware corruption during brownout events and ensures ADC reference settles before sampling begins. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V-to-5V/3.3V DC-DC converters powering FPGA and communication interfaces. IC Role / Device Role / Timing Role: Monitors primary 5V and secondary 3.3V rails; RSTIN tracks isolated 3.3V enable signal to confirm converter lock before releasing FPGA reset. Use Value: Eliminates need for external timing RC networks and guarantees deterministic startup across temperature and load variations. |
| Wearable Fitness Trackers | Automotive Infotainment Power Management |
|
Use Scenario: Bluetooth-enabled wristband using coin cell and buck-boost regulator generating 3.0V and 1.8V rails for RF SoC and motion sensor. IC Role / Device Role / Timing Role: VCC1 (3.0V) and VCC2 (1.8V) thresholds verify regulator outputs; RSTIN monitors battery voltage via divider to trigger graceful shutdown at 2.4V. Use Value: Extends usable battery capacity by 12% through accurate low-VBAT detection and prevents unexpected reboots during voltage sag. |
Use Scenario: Head unit with separate 5V USB host, 3.3V processor, and 1.2V DDR memory rails - requiring strict power-up order and fail-safe shutdown. IC Role / Device Role / Timing Role: Uses VCC1 (5V) and VCC2 (3.3V) to enforce I/O-before-core sequencing; RSTIN monitors 12V input via divider to initiate controlled power-down on ignition-off transition. Use Value: Meets ISO 16750-2 transient immunity requirements and avoids EEPROM corruption during vehicle battery disconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6743XKSHD3+ | Push-pull RESET output (vs. open-drain); identical VTH1/VTH2/RSTIN thresholds and timing | Requires no external pullup; better suited for systems with unidirectional reset lines or noise-sensitive environments | Select when µP reset pin is not bidirectional and board layout lacks space for pullup resistor |
| TPS3808G33DBVR | Dual-supply only (3.3V/1.8V fixed), no RSTIN; 300ms timeout; 1.6µA supply current | Lacks third adjustable monitor channel; optimized for ultra-low-power applications where only two rails require supervision | Choose when system has only two critical supplies and sub-2µA quiescent current is mandatory |
Compared with MAX6740XKSHD3+, MAX6743XKSHD3+ offers push-pull drive for simpler interfacing but forfeits manual reset detect capability, while TPS3808G33DBVR reduces current draw by 73% but removes the flexible RSTIN channel needed for custom voltage monitoring.
Availability
MAX6740XKSHD3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wearable fitness trackers, and automotive infotainment power management requiring stable component supply and long-term design-in support.
Supply support for MAX6740XKSHD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.
The MAX6736–MAX6745 family was designed specifically for low-power, multivoltage microprocessor supervision in space- and energy-constrained portable electronics - emphasizing factory-trimmed accuracy, minimal quiescent current, and integrated sequencing features.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6740XKSHD3+?
The MAX6740XKSHD3+ has a factory-trimmed VCC1 reset threshold of 2.925V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed by the "SH" suffix in the part number per Table 1 of the datasheet and applies specifically to the MAX6740 variant with D3 (150ms) timeout.
Does the MAX6740XKSHD3+ support manual reset functionality, and how is it implemented?
Yes, the MAX6740XKSHD3+ supports manual reset via its open-drain RESET pin, which includes an internal 50kΩ pullup to VCC1 and built-in debounce (37.5–75ms). Pressing a momentary switch between RESET and GND forces the output low; the device holds reset for the full 150ms timeout after release - no external components are required.
Can the MAX6740XKSHD3+ monitor a third voltage beyond VCC1 and VCC2?
Yes, the MAX6740XKSHD3+ includes an RSTIN pin with a precise 0.488V internal reference, allowing monitoring of a third voltage (e.g., battery, LDO enable, or auxiliary rail) using an external resistor divider. The threshold is set by VEXT_TH = 0.488V × ((R1 + R2)/R2), enabling flexible customization without additional ICs.
What is the supply current consumption of the MAX6740XKSHD3+ under typical operating conditions?
The MAX6740XKSHD3+ draws 6µA typical supply current when both VCC1 and VCC2 are above their thresholds and reset is not asserted. This ultra-low quiescent current is measured at TA = +25°C with VCC1 = 3.3V and VCC2 = 2.5V, making it ideal for battery-critical applications like wearables and remote sensors.
Is the MAX6740XKSHD3+ pin-compatible with other devices in the MAX6736–MAX6745 family?
No - the MAX6740XKSHD3+ uses a unique pin configuration among the family: Pin 3 is RSTIN and Pin 4 is VCC2. In contrast, MAX6736/MAX6737 place MR on Pin 3 and VCC2 on Pin 4, while MAX6742/MAX6745 assign PFI/PFO to Pins 3 and 4. PCB layout must be specific to the MAX6740 variant.
MAX6740XKSHD3+ 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:
- -
MAX6740XKSHD3+ FAQ
1.How can I place an order for MAX6740XKSHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6740XKSHD3+ 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 MAX6740XKSHD3+ reliable?
The price and inventory of MAX6740XKSHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6740XKSHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6740XKSHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6740XKSHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6740XKSHD3+?
MAX6740XKSHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6740XKSHD3+ 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 MAX6740XKSHD3+?
For technical support, including MAX6740XKSHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6740XKSHD3+ requirements.
6.How does Aetrix verify that MAX6740XKSHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6740XKSHD3+ 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 MAX6740XKSHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6740XKSHD3+?
All MAX6740XKSHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6740XKSHD3+, 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 MAX6740XKSHD3+ part is unused and in its original packaging.
Return procedure for MAX6740XKSHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6740XKSHD3+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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