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Analog Devices Inc./Maxim Integrated MAX6739XKLD3
- Part No.:
- MAX6739XKLD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6739XKLD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
MAX6739XKLD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VTH1 = 4.625V) and one adjustable reset input (RSTIN, 0.488V reference), open-drain RESET output, manual reset input (MR), and 150ms minimum reset timeout. It monitors primary I/O supply (VCC1) and secondary core supply (VCC2 = 3.075V) in portable electronics requiring precise power sequencing and low-quiescent-current supervision.
For engineers reviewing the MAX6739XKLD3 datasheet, MAX6739XKLD3 pinout, MAX6739XKLD3 application, or MAX6739XKLD3 equivalent, this device supports battery-powered multivoltage systems where accurate dual-supply monitoring, manual reset assertion, and ultra-low 6µA supply current are critical selection criteria.
Technical Context
The MAX6739XKLD3 implements two independent voltage monitoring channels: VCC1 (4.625V fixed threshold) and VCC2 (3.075V fixed threshold), plus an external RSTIN input referenced to a precision 0.488V internal bandgap. Its reset logic asserts active-low RESET when any monitored voltage falls below its threshold and holds it for ≥150ms after all voltages recover.
It features an internal 1.5kΩ MR pullup resistor, supports CMOS- or switch-driven manual reset, and uses open-drain RESET output requiring external pullup. The device operates across -40°C to +85°C and draws only 6µA total supply current at 3.3V/2.5V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V ±75mV over -40°C to +85°C - sets precise I/O supply reset point for 5V-tolerant systems |
| VCC2 Threshold | 3.075V ±50mV over -40°C to +85°C - matches common 3.3V core supply rails with tight tolerance |
| RSTIN Reference | 0.488V ±12mV - enables monitoring of additional supplies down to 0.5V via resistor divider |
| Reset Timeout | 150ms (min) - ensures µP reset pulse meets minimum assertion time for reliable boot initialization |
| Supply Current | 6µA typical at 3.3V/2.5V - enables multi-year battery life 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
MAX6739XKLD3 is housed in a 5-pin SC70 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pinout conforms to standard SC70-5 top view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Asserts low on VCC1/VCC2/RSTIN fault or MR activation; requires external pullup; drives µP reset pin directly |
| 2 - GND | Analog/digital ground reference | Single ground connection for all internal comparators, timers, and output stage; must be low-impedance |
| 3 - MR | Active-low manual reset input | Pull to GND ≥1µs to force RESET low; internal 1.5kΩ pullup to VCC1 allows direct pushbutton use |
| 4 - VCC2 | Secondary supply input (core rail) | Monitored at 3.075V threshold; powers internal VCC2 comparator; valid down to 0.9V |
| 5 - VCC1 | Primary supply input (I/O rail) | Monitored at 4.625V threshold; powers entire IC; operating range 1.0–5.5V; defines RESET pullup reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold monitoring | VCC1 = 4.625V and VCC2 = 3.075V factory-trimmed thresholds eliminate external resistor networks for standard rails |
| Adjustable third-input capability | RSTIN accepts external voltage divider to monitor auxiliary supplies (e.g., analog, RTC, or sensor rails) down to 0.5V |
| Ultra-low quiescent current | 6µA total ICC enables >10-year battery life in coin-cell–powered IoT sensors and wearables |
| 150ms reset timeout | Guaranteed minimum assertion time ensures µP completes full reset recovery before release |
| Integrated MR pullup | 1.5kΩ internal VCC1-referenced pullup eliminates external resistor for pushbutton reset implementation |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Battery-powered glucose meter with separate 3.3V MCU core and 5V display interface. IC Role / Device Role / Timing Role: Supervises VCC2 (3.3V core) and VCC1 (4.625V display rail); asserts RESET if either drops during cold-start or battery sag. Use Value: Prevents corrupted display initialization or MCU lockup by enforcing 150ms reset hold time during marginal supply conditions. |
Use Scenario: Ruggedized warehouse scanner with dual-voltage SoC and real-time clock backup. IC Role / Device Role / Timing Role: Monitors main 3.3V logic rail and 4.625V I/O rail; uses RSTIN to supervise 3.0V RTC backup supply via resistor divider. Use Value: Enables graceful shutdown and data retention when main power fails, using precise 0.488V RSTIN reference for low-voltage detection. |
| POS Payment Terminals | Smart Energy Meters |
Use Scenario: EMV-compliant payment terminal with isolated 5V communication interface and 3.3V secure element. IC Role / Device Role / Timing Role: Ensures synchronized reset of both domains using single MAX6739XKLD3; MR pin enables hardware-initiated firmware update reset. Use Value: Eliminates need for discrete reset ICs per rail, reducing BOM count and PCB area while maintaining fail-safe boot integrity. |
Use Scenario: Two-way AMI meter with 3.3V metrology ASIC and 4.625V PLC modem supply. IC Role / Device Role / Timing Role: Supervises primary and secondary rails; leverages low 6µA ICC to meet IEC 62056-21 standby power limits. Use Value: Extends battery backup runtime during mains outage without compromising reset reliability or timing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6738XKLD3 | Same SC70-5 package, identical 4.625V/3.075V thresholds and 150ms timeout, but open-drain RESET (same as MAX6739XKLD3) | No MR input - lacks manual reset capability; requires external circuitry for user-initiated reset | Select MAX6738XKLD3 only if manual reset is unnecessary and board layout already accommodates open-drain RESET |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed), SOT-23-5, 1.6µA ICC, 200ms timeout - no dual-rail or RSTIN support | Only monitors one rail; cannot replace dual-monitoring function without adding second IC | Choose only for cost-sensitive single-rail applications where dual monitoring is not required |
Compared with MAX6739XKLD3, MAX6738XKLD3 omits MR functionality but matches all supervision parameters, while TPS3808G33DBVR provides lower ICC but sacrifices dual-rail monitoring and adjustable input - making MAX6739XKLD3 uniquely suited for compact, manually resettable dual-supply systems.
Availability
MAX6739XKLD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, POS payment terminals, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6739XKLD3 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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX6736–MAX6745 family delivers ultra-low-power dual/triple-supply supervision for battery-critical portable systems, emphasizing factory-trimmed accuracy, minimal footprint, and robust transient immunity.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6739XKLD3?
The MAX6739XKLD3 has a factory-trimmed VCC1 reset threshold of 4.625V, with ±75mV tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet under suffix "LT", and applies specifically to the MAX6739XKLD3 variant - not inferred from other members of the MAX6736–MAX6745 family.
Does MAX6739XKLD3 support manual reset, and how is it implemented?
Yes, MAX6739XKLD3 includes a dedicated active-low MR input (Pin 3) with an internal 1.5kΩ pullup to VCC1. Pulling MR low for ≥1µs forces RESET low for 150ms after MR returns high. This enables direct pushbutton or logic-level reset initiation without external components - a confirmed feature unique to MAX6736–MAX6739 variants.
What is the function of the RSTIN pin on MAX6739XKLD3, and what voltage does it monitor?
The RSTIN pin (Pin 4) on MAX6739XKLD3 provides an adjustable reset input referenced to an internal 0.488V precision bandgap. When the voltage at RSTIN falls below 0.488V, RESET is asserted. An external resistor divider sets the monitored voltage - e.g., a 100kΩ/10kΩ network monitors ~5.37V. This function is explicitly documented for MAX6738/MAX6739 in the Selector Guide and Pin Description.
What package type and dimensions does MAX6739XKLD3 use?
MAX6739XKLD3 is packaged in a 5-pin SC70 (SC70-5) case measuring 2.0mm × 1.25mm with 0.65mm lead pitch. This is confirmed in the Ordering Information section and Pin Configurations diagram, and is consistent across all MAX6736–MAX6745 variants - no alternate packages are offered for this part number.
What is the guaranteed minimum reset timeout period for MAX6739XKLD3?
The MAX6739XKLD3 guarantees a minimum reset timeout period of 150ms, denoted by the "D3" suffix in its part number. This is specified in Table 3 (VCC Timeout Period Suffix Guide) and confirmed in the Electrical Characteristics table under parameter "tRP" with min = 150ms for D3 variants - applicable across the full operating temperature range.
MAX6739XKLD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX6739XKLD3 FAQ
1.How can I place an order for MAX6739XKLD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6739XKLD3 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 MAX6739XKLD3 reliable?
The price and inventory of MAX6739XKLD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6739XKLD3 is usually 5 days.
3.What payment methods are accepted for MAX6739XKLD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6739XKLD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6739XKLD3?
MAX6739XKLD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6739XKLD3 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 MAX6739XKLD3?
For technical support, including MAX6739XKLD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6739XKLD3 requirements.
6.How does Aetrix verify that MAX6739XKLD3 is sourced from the original manufacturer or authorized distributors?
All MAX6739XKLD3 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 MAX6739XKLD3 meets industry standards.
7.What is the process for return or replacement of MAX6739XKLD3?
All MAX6739XKLD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6739XKLD3, 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 MAX6739XKLD3 part is unused and in its original packaging.
Return procedure for MAX6739XKLD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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