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Analog Devices Inc./Maxim Integrated MAX6738XKZD3
- Part No.:
- MAX6738XKZD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6738XKZD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
The MAX6738XKZD3 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VTH1 = 2.925V) and one adjustable reset input (RSTIN, 0.488V reference), open-drain active-low RESET output, manual reset input (MR), and SC70-5 package. It monitors primary supply VCC1 and secondary supply VCC2 across 1.8V–5.0V and 0.9V–3.3V ranges respectively, asserting reset if either falls below its threshold and maintaining reset for ≥150ms after recovery. It is used in portable battery-powered systems requiring precise dual-rail power monitoring and reliable reset assertion during brownout.
For engineers reviewing the MAX6738XKZD3 datasheet, MAX6738XKZD3 pinout, MAX6738XKZD3 application, or MAX6738XKZD3 equivalent, key selection criteria include its 2.925V/0.788V dual-threshold configuration, 6µA quiescent current, 150ms reset timeout, SC70-5 footprint, and RSTIN-adjustable monitoring capability down to 0.5V - critical for multivoltage SoC power sequencing and low-power embedded designs.
Technical Context
The MAX6738XKZD3 implements dual-supply supervision using independent comparators for VCC1 and VCC2, plus a dedicated 0.488V precision reference for the RSTIN adjustable input. Its reset logic asserts active-low RESET when any monitored voltage drops below its threshold and holds it asserted until all voltages exceed thresholds for ≥150ms (D3 timeout option).
It features an internal 1.5kΩ pullup on MR, supports manual reset via external pushbutton to GND, and uses open-drain RESET requiring external pullup. The device operates over –40°C to +85°C and draws only 6µA total supply current, enabling use in energy-constrained applications without compromising supervision accuracy or timing integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.925V ±2.5% (factory-trimmed; enables reliable I/O rail monitoring at 3.0V nominal) |
| VCC2 Threshold | 0.788V ±2.5% (factory-trimmed; supports core rail supervision down to 0.8V) |
| RSTIN Threshold | 0.488V ±1.5% (internal reference; allows external resistor-divider to monitor voltages ≥0.5V) |
| Reset Timeout | 150ms minimum (D3 suffix; ensures µP reset pulse meets minimum assertion time requirements) |
| Supply Current | 6µA typical (enables >1-year battery life in coin-cell–powered devices) |
| Operating Temp | –40°C to +85°C (supports industrial and automotive cabin-temperature environments) |
| Package | 5-pin SC70 (1.6mm × 1.6mm footprint; saves PCB area vs. SOT23-6) |
Pinout & Package
MAX6738XKZD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height) with wettable flanks, suitable for automated optical inspection (AOI) and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Asserts low when VCC1, VCC2, or RSTIN falls below threshold; requires external pullup; drives µP reset pin directly |
| 2 - GND | Analog/digital ground reference | Common return path for all internal comparators and reference circuits; 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 eliminates need for external resistor |
| 4 - VCC2 | Secondary supply voltage input | Monitors core rail (e.g., 1.2V, 1.8V); threshold fixed at 0.788V per part suffix "D" |
| 5 - VCC1 | Primary supply voltage input | Monitors I/O rail (e.g., 3.3V); threshold fixed at 2.925V per part suffix "Z" |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed/adjustable threshold supervision | Combines factory-trimmed VCC1/VCC2 monitoring with user-configurable RSTIN input for third-rail or custom voltage detection |
| Ultra-low 6µA supply current | Reduces standby power in always-on systems; extends battery life in portable medical and IoT edge nodes |
| 150ms reset timeout (D3) | Guarantees sufficient reset pulse width for modern µPs and FPGAs without external timing components |
| SC70-5 package | Enables high-density PCB layouts in space-constrained handheld and wearable electronics |
| Manual reset with internal pullup | Eliminates external MR pullup resistor, reducing BOM count and layout complexity |
Applications
| Portable Power Management | Multivoltage SoC Sequencing |
|---|---|
Use Scenario: Battery-powered GPS tracker operating from Li-ion (3.6V) and LDO-regulated 1.8V core rail, requiring brownout detection before data corruption occurs. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RESET when either rail dips below threshold, with 150ms hold time ensuring clean µP restart. Use Value: Prevents firmware crash during transient battery sag; 6µA current minimizes self-discharge during sleep mode. | Use Scenario: FPGA-based industrial controller with separate 3.3V I/O and 1.2V core supplies needing controlled power-up sequence. IC Role / Device Role / Timing Role: Monitors both rails simultaneously; asserts RESET until both stabilize above thresholds for ≥150ms. Use Value: Eliminates need for discrete RC timers or additional supervisors; factory-trimmed thresholds ensure ±2.5% accuracy across temperature. |
| Handheld Medical Device | POS Terminal Power Integrity |
Use Scenario: Portable blood glucose meter using coin cell and boost converter, where low-voltage detection must trigger shutdown before memory loss. IC Role / Device Role / Timing Role: Uses RSTIN with resistor divider to monitor boosted 5V rail at 4.5V trip point while supervising 3.0V system rail. Use Value: Adjustable input extends supervision range beyond factory thresholds; SC70-5 fits compact PCB layout. | Use Scenario: Retail POS terminal with 12V input, 5V main rail, and 3.3V logic rail subject to load transients during printer activation. IC Role / Device Role / Timing Role: Detects 5V rail dip below 4.625V (via VCC1) and 3.3V rail dip below 3.075V (via VCC2), holding RESET until both recover. Use Value: 150ms timeout prevents nuisance resets during brief motor-induced sags; open-drain RESET interfaces cleanly with multiple downstream logic devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6738XKTD3 | VCC1 = 3.075V, VCC2 = 2.625V (vs. 2.925V/0.788V); same package, timing, and features | Better suited for 3.3V/2.5V dual-rail systems; less optimal for 3.0V/0.8V core-I/O combinations | Select MAX6738XKZD3 when supervising 3.0V I/O and sub-1V core rails; choose MAX6738XKTD3 for higher VCC2 thresholds. |
| TPS3808G15DBVR | Single-supply supervisor (1.5V threshold only); 350ms timeout; SOT-23-6 package; 1.5µA current | Lacks dual-rail monitoring and RSTIN adjustability; requires external circuitry for second-rail supervision | Use only when single-rail monitoring suffices; MAX6738XKZD3 provides integrated dual-rail functionality in smaller SC70-5 footprint. |
Compared with MAX6738XKTD3, the MAX6738XKZD3 offers tighter alignment with 3.0V I/O and 0.8V core rails, while versus TPS3808G15DBVR it delivers true dual-supply supervision without external components - reducing design risk and board area in multivoltage embedded systems.
Availability
MAX6738XKZD3 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6738XKZD3 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 demanding industrial, medical, and communications applications.
The MAX6736–MAX6745 product line delivers ultra-low-power dual- and triple-voltage µP supervisors optimized for battery-operated and space-constrained systems requiring accurate, factory-trimmed reset thresholds and minimal quiescent current.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6738XKZD3?
The MAX6738XKZD3 has a factory-trimmed VCC1 reset threshold of 2.925V and a VCC2 threshold of 0.788V, both specified over –40°C to +85°C with ±2.5% tolerance. These values are confirmed by Maxim's Ordering Information tables and electrical characteristics section, where suffix "Z" corresponds to VCC1 = 2.925V and "D" to VCC2 = 0.788V.
Does the MAX6738XKZD3 support adjustable reset monitoring, and how is it implemented?
Yes, the MAX6738XKZD3 supports adjustable reset monitoring via its RSTIN pin, which references an internal 0.488V comparator threshold. An external resistor-divider network connected to RSTIN allows monitoring of voltages down to 0.5V - for example, setting a 4.5V trip point using R1/R2 = 8.2:1. This feature is explicitly documented in the "Adjustable Input Voltage" section and Electrical Characteristics table.
What is the reset timeout period for the MAX6738XKZD3, and is it configurable?
The MAX6738XKZD3 has a fixed 150ms minimum reset timeout period, indicated by the "D3" suffix in its part number. This value is guaranteed across temperature and supply voltage, with typical values of 225ms and max of 300ms. It is not user-configurable; alternative timeout options (e.g., D7 = 1200ms) require different part numbers.
What package type and pin count does the MAX6738XKZD3 use, and is it RoHS-compliant?
The MAX6738XKZD3 uses a 5-pin SC70-5 package (1.6mm × 1.6mm), as confirmed in the Pin Configurations diagram and Ordering Information table. It is available in both leaded and lead-free versions; ordering with "+T" suffix (e.g., MAX6738XKZD3+T) specifies RoHS-compliant, lead-free packaging with matte tin finish.
How does the manual reset (MR) function work on the MAX6738XKZD3, and what are its timing requirements?
The MR input on the MAX6738XKZD3 is active-low with an internal 1.5kΩ pullup to VCC1. Pulling MR low for ≥1µs forces RESET low; RESET remains low for ≥150ms after MR returns high. This behavior is verified in the Electrical Characteristics table (tMRP = 150ms min) and Functional Diagram, and requires no external components for basic operation.
MAX6738XKZD3 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:
- 2.313V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6738XKZD3 FAQ
1.How can I place an order for MAX6738XKZD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6738XKZD3 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 MAX6738XKZD3 reliable?
The price and inventory of MAX6738XKZD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6738XKZD3 is usually 5 days.
3.What payment methods are accepted for MAX6738XKZD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6738XKZD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6738XKZD3?
MAX6738XKZD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6738XKZD3 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 MAX6738XKZD3?
For technical support, including MAX6738XKZD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6738XKZD3 requirements.
6.How does Aetrix verify that MAX6738XKZD3 is sourced from the original manufacturer or authorized distributors?
All MAX6738XKZD3 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 MAX6738XKZD3 meets industry standards.
7.What is the process for return or replacement of MAX6738XKZD3?
All MAX6738XKZD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6738XKZD3, 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 MAX6738XKZD3 part is unused and in its original packaging.
Return procedure for MAX6738XKZD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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