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Analog Devices Inc./Maxim Integrated MAX6742XKLD3-T
- Part No.:
- MAX6742XKLD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6742XKLD3-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,370
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Product details
Overview
The MAX6742XKLD3-T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC1 reset threshold (4.625V), independent power-fail comparator input (PFI) and output (PFO), push-pull active-low RESET, and 150ms minimum reset timeout. It monitors primary supply VCC1 while providing early power-fail warning for battery-backed or DC-DC converter systems. Designed for portable equipment requiring precise voltage supervision and graceful shutdown.
For engineers reviewing the MAX6742XKLD3-T datasheet, MAX6742XKLD3-T pinout, MAX6742XKLD3-T application, or MAX6742XKLD3-T equivalent, key selection factors include its 4.625V/- VTH1/VTH2 configuration, SC70-5 package, 6µA supply current, PFI/PFO functionality, and compatibility with 1.8V–5.0V I/O and 0.9V–3.3V core supplies.
Technical Context
The MAX6742XKLD3-T implements a dual-supply monitoring architecture where VCC1 (primary I/O supply) is compared against a precision 4.625V factory-trimmed threshold, while the PFI input references an internal 488mV comparator to detect falling input voltages - enabling configurable power-fail detection down to 0.5V. Its RESET output is push-pull, eliminating need for external pullup.
It features a dedicated PFO open-drain output asserted when PFI falls below 488mV, with no timeout on deassertion - allowing immediate system response to power recovery. The 150ms reset timeout (D3 suffix) is temperature-stable and begins only after all monitored conditions are satisfied, ensuring robust immunity to transient dips.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V ±75mV (factory-trimmed; ensures reliable reset assertion for 5V I/O rails) |
| PFI Threshold Voltage | 488mV ±20mV (internal reference enables precise external voltage monitoring via resistor divider) |
| Reset Timeout Period | 150ms min (D3 option; guarantees µP reset hold time sufficient for full processor initialization) |
| Supply Current | 6µA typical (enables multi-year battery life in always-on portable systems) |
| Operating Temp Range | -40°C to +85°C (supports industrial and automotive cabin-temperature applications) |
| Package | 5-pin SC70 (1.6mm × 1.6mm footprint; saves PCB area vs. SOT23) |
| RESET Output Type | Push-pull active-low (drives directly into µP reset pin without external pullup resistor) |
Pinout & Package
Package: 5-pin SC70 (1.6mm × 1.6mm, 0.65mm pitch), surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Push-pull driver referenced to VCC1; asserts low during VCC1 undervoltage or PFI fault; no external pullup required |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and output drivers; must be low-impedance connection |
| 3 - PFI | Power-fail comparator input | Noninverting input referenced to 488mV; connects to external resistor divider for custom trip point (e.g., battery voltage monitor) |
| 4 - PFO | Power-fail comparator output | Open-drain active-low output; asserts immediately on PFI < 488mV; deasserts instantly when PFI rises above threshold (no timeout) |
| 5 - VCC1 | Primary supply input | Power source and monitored rail; powers internal circuitry and sets RESET output high level; supports 1.2V–5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| Independent Power-Fail Detection | Dedicated PFI/PFO path provides early warning of supply degradation before VCC1 reset threshold is breached - enables orderly shutdown or backup activation |
| Factory-Trimmed Precision Threshold | 4.625V VCC1 reset threshold with ±75mV tolerance over -40°C to +85°C eliminates calibration effort and improves system reliability |
| Ultra-Low Quiescent Current | 6µA total supply current allows integration into energy-sensitive applications such as coin-cell-powered IoT sensors and wearables |
| SC70-5 Small Outline Package | 1.6mm × 1.6mm footprint reduces PCB real estate by >40% vs. standard SOT23-5, critical for space-constrained portable designs |
| Push-Pull RESET Output | Eliminates need for external pullup resistor and associated BOM cost, simplifies layout, and ensures deterministic rise/fall timing into µP reset pin |
Applications
| Battery Backup Monitoring | DC-DC Converter Supervision |
|---|---|
Use Scenario: Monitoring lithium coin-cell or supercapacitor backup voltage in real-time clock (RTC) or SRAM retention circuits. IC Role / Device Role / Timing Role: MAX6742XKLD3-T acts as power-fail detector using PFI to sense backup voltage decay; triggers PFO to initiate data save and enter low-power mode before main supply collapse. Use Value: Prevents data corruption by enabling >100ms warning window prior to VCC1 reset, leveraging PFO's instantaneous deassertion on recovery. | Use Scenario: Ensuring clean startup/shutdown sequencing of dual-rail DC-DC converters powering FPGA I/O banks and core logic. IC Role / Device Role / Timing Role: MAX6742XKLD3-T supervises primary 5V input (VCC1) and uses PFI to monitor secondary 3.3V rail integrity; PFO signals converter fault before VCC1 drops below 4.625V. Use Value: Enables system-level fault containment - PFO can disable downstream converters or trigger watchdog reset before cascading failure occurs. |
| Portable Medical Device Power Management | Industrial Controller Brownout Protection |
Use Scenario: Power supervision in handheld glucose meters or pulse oximeters powered by single AA/AAA cells with declining voltage profile. IC Role / Device Role / Timing Role: MAX6742XKLD3-T monitors main 3.3V rail (VCC1) and uses PFI to track battery voltage via resistor divider; asserts PFO at 2.4V to trigger low-battery alert and suspend noncritical functions. Use Value: Extends usable battery life by 12–18% through predictive shutdown - avoids abrupt reset at 2.2V cutoff, preserving measurement history. | Use Scenario: Protecting programmable logic controllers (PLCs) from brownout-induced firmware corruption during AC line sags. IC Role / Device Role / Timing Role: MAX6742XKLD3-T supervises 5V system rail (VCC1) and employs PFI to monitor rectified AC input pre-regulator; PFO initiates controlled I/O freeze and memory flush upon detected sag. Use Value: Meets IEC 61000-4-11 immunity requirements by providing deterministic response to 10ms–100ms sags, independent of µP clock stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6745XKLD3-T | Same pinout and PFI/PFO function, but push-pull RESET instead of open-drain; identical VCC1 threshold and timeout | Designed for systems requiring active-drive reset (e.g., driving multiple loads or long traces); lacks manual reset input | Select MAX6745XKLD3-T if push-pull drive strength is needed and MR input is unnecessary |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed threshold); no PFI/PFO; 350ms timeout; SOT23-6 package | Lacks independent power-fail detection; requires external circuitry for battery monitoring; larger footprint | Choose only if PFI/PFO functionality is not required and board space permits SOT23-6 |
Compared with MAX6742XKLD3-T, MAX6745XKLD3-T offers identical supervision accuracy and power-fail capability but replaces open-drain RESET with push-pull - simplifying interface but removing flexibility for wired-OR reset buses; TPS3808G33DBVR provides lower-cost basic reset but omits the critical PFI/PFO feature essential for predictive power management.
Availability
MAX6742XKLD3-T is available at Aetrix Electronics and suitable for portable medical devices, battery-backed instrumentation, industrial PLCs, and DC-DC converter modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6742XKLD3-T 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, communications, and consumer applications.
The MAX6736–MAX6745 family was designed specifically for multivoltage microprocessor systems requiring ultra-low-power, precision reset supervision with auxiliary power-fail detection - targeting portable, battery-operated, and space-constrained embedded platforms.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6742XKLD3-T?
The MAX6742XKLD3-T has a factory-trimmed VCC1 reset threshold of 4.625V, with guaranteed tolerance of ±75mV over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix "LT", and applies specifically to the MAX6742 variant with L/T coding - not inferred from other family members.
Does the MAX6742XKLD3-T provide manual reset capability?
No, the MAX6742XKLD3-T does not include a manual reset (MR) input. Per the Selector Guide and Pin Description, MR is absent on MAX6742/MAX6745 variants. The device relies solely on VCC1 monitoring and PFI-triggered reset. For manual reset functionality, consider MAX6740XKLD3-T or MAX6741XKLD3-T instead.
How is the power-fail threshold set on the MAX6742XKLD3-T?
The MAX6742XKLD3-T uses an internal 488mV reference for its PFI comparator. To set a custom power-fail trip point (e.g., 2.4V), connect PFI to a resistor divider between VCC1 and GND, sized so that the node voltage equals 488mV when the monitored supply reaches the desired threshold. The formula is VEXT = 488mV × (R1 + R2)/R2.
What is the function of the PFO pin on the MAX6742XKLD3-T?
The PFO (Power-Fail Output) pin on the MAX6742XKLD3-T is an open-drain active-low output that asserts immediately when the PFI input falls below 488mV, and deasserts instantly when PFI rises above that threshold - with no timeout delay. This enables real-time power-fail signaling for battery backup control or system suspend functions.
Is the MAX6742XKLD3-T pin-compatible with other devices in the MAX6736–MAX6745 family?
The MAX6742XKLD3-T shares the same 5-pin SC70 package and pinout (RESET, GND, PFI, PFO, VCC1) with MAX6745XKLD3-T, but is not pin-compatible with MAX6736–MAX6741 variants, which use different pin assignments for MR, VCC2, RSTIN, or POK1. Always verify pin function per device-specific Pin Configuration diagram.
MAX6742XKLD3-T 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:
- 1
- Voltage - Threshold:
- 4.625V
- 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
MAX6742XKLD3-T FAQ
1.How can I place an order for MAX6742XKLD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6742XKLD3-T 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 MAX6742XKLD3-T reliable?
The price and inventory of MAX6742XKLD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6742XKLD3-T is usually 5 days.
3.What payment methods are accepted for MAX6742XKLD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6742XKLD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6742XKLD3-T?
MAX6742XKLD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6742XKLD3-T 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 MAX6742XKLD3-T?
For technical support, including MAX6742XKLD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6742XKLD3-T requirements.
6.How does Aetrix verify that MAX6742XKLD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6742XKLD3-T 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 MAX6742XKLD3-T meets industry standards.
7.What is the process for return or replacement of MAX6742XKLD3-T?
All MAX6742XKLD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6742XKLD3-T, 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 MAX6742XKLD3-T part is unused and in its original packaging.
Return procedure for MAX6742XKLD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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