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Analog Devices Inc./Maxim Integrated MAX6742XKZD3-T
- Part No.:
- MAX6742XKZD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6742XKZD3-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6742XKZD3-T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC1 reset threshold (2.313V), an independent power-fail comparator (PFI/PFO), open-drain RESET output, and 150ms minimum reset timeout. It monitors primary supply VCC1 while providing early warning of impending power loss via PFO assertion below 0.488V - used in battery-backed systems and DC-DC converter supervision.
For engineers reviewing the MAX6742XKZD3-T datasheet, MAX6742XKZD3-T pinout, MAX6742XKZD3-T application, or MAX6742XKZD3-T equivalent, key selection criteria include its 2.313V VCC1 threshold, 0.488V PFI trip point, SC70-5 package compatibility, 6µA supply current, and absence of manual reset input or POK output - distinguishing it from MAX6741/MAX6744 and MAX6736–MAX6739 variants.
Technical Context
The MAX6742XKZD3-T implements a dedicated single-supply monitoring architecture: VCC1 is compared against a precision 2.313V factory-trimmed threshold, while the auxiliary power-fail comparator uses a fixed 0.488V internal reference on PFI to drive open-drain PFO. RESET assertion is triggered independently by either VCC1 drop below threshold or PFI falling below 0.488V - with no timeout on PFO deassertion.
Its SC70-5 package integrates only five terminals: VCC1, GND, RESET, PFI, and PFO - omitting MR, VCC2, RSTIN, and POK1 found in other MAX6736–MAX6745 family members. The 150ms reset timeout (D3 suffix) applies only to VCC1-initiated resets; PFO responds within 35µs propagation delay and has no hold time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.313V ±0.045V (factory-trimmed, -40°C to +85°C) - sets precise brownout detection for 2.5V or 3.3V rail monitoring. |
| PFI Threshold | 0.488V ±0.015V (fixed internal reference) - enables accurate low-voltage detection for battery or DC-DC input monitoring. |
| Reset Timeout | 150ms min (D3 option) - ensures µP remains held in reset long enough for stable power recovery after VCC1 dip. |
| Supply Current | 6µA typical at +25°C - supports multi-year operation in coin-cell–powered backup circuits and portable devices. |
| PFO Propagation Delay | 35µs max (10mV/µs edge) - provides fast response to power-fail events without software intervention. |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood applications requiring extended thermal range. |
| Package | SC70-5 (2.0mm × 1.25mm, 0.65mm pitch) - enables high-density PCB layouts in space-constrained embedded modules. |
Pinout & Package
MAX6742XKZD3-T is housed in a 5-pin SC70-5 package with exposed pad (not electrically connected). Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is PFI (power-fail input), Pin 4 is PFO (open-drain active-low power-fail output), and Pin 5 is VCC1 (primary supply input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Asserted when VCC1 < 2.313V or PFI < 0.488V; requires external pullup; drives µP reset pin directly. |
| 2 - GND | Analog/digital ground reference | Single ground connection for all internal comparators and output drivers; must be low-impedance. |
| 3 - PFI | Power-fail comparator noninverting input | Monitors external voltage divider; asserts PFO when input falls below 0.488V; <10nA input bias. |
| 4 - PFO | Open-drain active-low power-fail output | Asserted immediately on PFI drop; deasserted instantly on PFI rise - no timeout - ideal for fast shutdown signaling. |
| 5 - VCC1 | Primary supply input and internal bias source | Powers internal circuitry and references all thresholds; operates from 1.2V to 5.5V; supplies internal pullups. |
Key Features
| Feature | Design Value |
|---|---|
| Independent Power-Fail Detection | Dedicated PFI/PFO path with 0.488V reference enables early warning of supply collapse before VCC1 drops to reset threshold. |
| No Manual Reset Input | Omits MR pin - simplifies design where system-level reset is handled externally or via PFO-triggered firmware action. |
| Low-Power Supervision | 6µA total supply current allows integration into always-on battery-monitoring circuits without measurable drain. |
| Fast PFO Response | 35µs max propagation delay ensures real-time reaction to input voltage faults - critical for data retention and safe state capture. |
| Factory-Trimmed Precision | VCC1 threshold tolerance of ±0.045V over full temperature range eliminates need for external calibration or trimming resistors. |
Applications
| Battery Backup Monitoring | DC-DC Converter Supervision |
|---|---|
|
Use Scenario: Monitoring lithium coin-cell voltage in real-time clock (RTC) or SRAM backup circuits to initiate graceful shutdown before data loss. IC Role / Device Role / Timing Role: MAX6742XKZD3-T acts as a dedicated power-fail sentinel, asserting PFO when cell voltage drops below 2.2V (via resistor divider), triggering MCU-controlled save-and-hibernate sequence. Use Value: Enables deterministic low-battery response with 35µs latency - faster than µP ADC polling - preserving volatile memory contents. |
Use Scenario: Supervising input voltage of a buck converter powering an FPGA core rail to detect upstream supply failure before VCC drops. IC Role / Device Role / Timing Role: MAX6742XKZD3-T monitors converter input (e.g., 12V bus) via PFI; asserts PFO to signal fault condition while VCC1 remains stable, allowing preemptive core throttling. Use Value: Prevents FPGA configuration corruption by enabling controlled reconfiguration before main rail collapse - no reset timeout delay required. |
| Industrial Sensor Node Power Management | POS Terminal Power Sequencing |
|
Use Scenario: Ensuring reliable startup and brownout protection in battery-operated wireless sensor nodes with dual-rail (3.3V I/O, 1.8V MCU) architecture. IC Role / Device Role / Timing Role: MAX6742XKZD3-T supervises the 3.3V I/O rail (VCC1 = 3.3V, VTH = 2.313V) and uses PFI to monitor battery level - resetting MCU only when I/O rail fails, not battery sag. Use Value: Decouples brownout response from battery aging - extends field life by avoiding false resets during transient load-induced voltage dips. |
Use Scenario: Providing fail-safe power sequencing in point-of-sale terminals where 5V logic must initialize before 3.3V peripherals. IC Role / Device Role / Timing Role: MAX6742XKZD3-T monitors 5V rail (VCC1) and feeds PFO signal to enable 3.3V regulator only after stable 5V is confirmed - using external logic gate. Use Value: Eliminates need for dedicated POK output IC; leverages PFO's immediate deassertion to reduce boot time versus timeout-based sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6745XKZD3-T | Push-pull RESET output (vs. open-drain); identical VCC1 threshold (2.313V), PFI/PFO functionality, and SC70-5 package. | Eliminates need for external RESET pullup resistor; suitable where µP reset pin requires driven-high state during normal operation. | Select MAX6745XKZD3-T when board layout lacks space for pullup or µP reset pin is not open-drain compatible. |
| MAX6741XKZD3-T | Includes VCC1 POK1 output (open-drain active-high) and VCC2 monitoring; no PFI/PFO; same 2.313V VCC1 threshold and D3 timeout. | Designed for strict power-supply sequencing (e.g., VCC1-to-VCC2 enable timing), not power-fail warning; requires second supply rail. | Choose MAX6741XKZD3-T only when dual-rail sequencing is required and PFI-based early warning is unnecessary. |
Compared with MAX6742XKZD3-T, MAX6745XKZD3-T offers push-pull RESET for simplified interface but identical supervision logic, while MAX6741XKZD3-T replaces PFI/PFO with POK1/VCC2 for sequencing - making MAX6742XKZD3-T uniquely suited for single-rail power-fail detection with minimal BOM count.
Availability
MAX6742XKZD3-T is available at Aetrix Electronics and suitable for battery backup monitoring, DC-DC converter supervision, and industrial sensor node power management requiring stable component supply, long-term lifecycle support, and guaranteed lead-free packaging.
Supply support for MAX6742XKZD3-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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX6736–MAX6745 family was developed to replace discrete reset solutions with integrated, ultra-low-power supervisory circuits optimized for portable and battery-critical systems - with MAX6742XKZD3-T targeting single-rail power-fail detection.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6742XKZD3-T?
The MAX6742XKZD3-T has a factory-trimmed VCC1 reset threshold of 2.313V, with a guaranteed tolerance of ±0.045V across the full -40°C to +85°C operating temperature range. This value is defined by the 'Z' suffix per Table 2 in the datasheet and applies specifically to the MAX6742/MAX6745 variant group - not inferred from other family members.
Does MAX6742XKZD3-T support manual reset functionality?
No, the MAX6742XKZD3-T does not include a manual reset (MR) input. Its pinout omits MR entirely - confirmed by the SC70-5 pin configuration diagram showing only RESET, GND, PFI, PFO, and VCC1. Manual reset capability is present only in MAX6736–MAX6739 and MAX6740–MAX6744 variants.
What is the function of the PFI and PFO pins on MAX6742XKZD3-T?
On the MAX6742XKZD3-T, PFI is the noninverting input of an independent power-fail comparator referenced to a precise 0.488V internal voltage. When PFI falls below this threshold, PFO (open-drain active-low) is asserted immediately - with no timeout - enabling fast fault signaling for battery or input rail monitoring.
Can MAX6742XKZD3-T monitor a second supply voltage like VCC2?
No, the MAX6742XKZD3-T monitors only VCC1 and the auxiliary PFI input - it does not support VCC2 monitoring. The device belongs to the MAX6742/MAX6745 subgroup, which is explicitly defined in the datasheet as "monitor[ing] the primary VCC supply and have[ing] an independent power-fail comparator", with no VCC2 terminal in its SC70-5 pinout.
What is the reset timeout period for MAX6742XKZD3-T and how is it selected?
The MAX6742XKZD3-T has a 150ms minimum reset timeout period, indicated by the 'D3' suffix in its part number. This value is fixed per ordering code and confirmed in Table 3 of the datasheet; the alternative D7 option (1200ms) is not available for this specific suffix combination.
MAX6742XKZD3-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:
- 2.313V
- 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
MAX6742XKZD3-T FAQ
1.How can I place an order for MAX6742XKZD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6742XKZD3-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 MAX6742XKZD3-T reliable?
The price and inventory of MAX6742XKZD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6742XKZD3-T is usually 5 days.
3.What payment methods are accepted for MAX6742XKZD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6742XKZD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6742XKZD3-T?
MAX6742XKZD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6742XKZD3-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 MAX6742XKZD3-T?
For technical support, including MAX6742XKZD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6742XKZD3-T requirements.
6.How does Aetrix verify that MAX6742XKZD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6742XKZD3-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 MAX6742XKZD3-T meets industry standards.
7.What is the process for return or replacement of MAX6742XKZD3-T?
All MAX6742XKZD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6742XKZD3-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 MAX6742XKZD3-T part is unused and in its original packaging.
Return procedure for MAX6742XKZD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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