Analog Devices Inc./Maxim Integrated MAX6742XKTD7

Overview

The MAX6742XKTD7 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC monitoring primary V_CC supply and featuring an independent power-fail comparator. It asserts an open-drain active-low RESET when V_CC1 falls below its factory-trimmed threshold (e.g., 3.075V for suffix "T") or when PFI drops below 0.488V, with a guaranteed 1200ms minimum reset timeout period. Designed for portable and multivoltage systems, it operates from -40°C to +85°C in a 5-pin SC70 package.

For engineers reviewing the MAX6742XKTD7 datasheet, MAX6742XKTD7 pinout, MAX6742XKTD7 application, or MAX6742XKTD7 equivalent, key selection criteria include its dedicated PFI/PFO power-fail monitoring capability, 6µA supply current, SC70-5 footprint, and compatibility with battery-backed systems requiring early brownout warning before main reset assertion.

Technical Context

The MAX6742XKTD7 integrates two independent supervisory functions: a primary V_CC1 reset monitor with factory-trimmed threshold (e.g., 3.075V ±1.5%) and a separate power-fail comparator with fixed 0.488V reference on PFI. Its RESET output is open-drain with internal 50kΩ pullup to V_CC1, enabling manual reset detect functionality without external components.

It features no manual reset input (MR) pin-reset initiation occurs only via V_CC1 undervoltage or PFI assertion-and lacks POK output or RSTIN adjustable input. The 1200ms reset timeout (D7 suffix) is temperature-stable, with <±1.5% variation across -40°C to +85°C per typical characterization data.

Key Specifications

Pinout & Package

Package: 5-pin SC70-5 (2.0mm × 1.25mm × 0.9mm, 0.65mm pitch), surface-mount, lead-free compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6745XKTD7, the MAX6742XKTD7 provides open-drain flexibility for shared reset buses and built-in manual-reset-detect; compared with TPS3808G33DBVR, it delivers unique dual-path supervision (V_CC1 + PFI) in half the footprint, enabling compact battery-aware designs.

Availability

MAX6742XKTD7 is available at Aetrix Electronics and suitable for portable medical sensors, battery-backed RTUs, and industrial edge controllers requiring stable component supply with long-term manufacturability.

Supply support for MAX6742XKTD7 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, sensing, and interface applications, with leadership in low-power supervisory and PMIC solutions.

The MAX6736–MAX6745 family was engineered specifically for space- and power-constrained multivoltage systems needing coordinated reset and predictive power-fail detection-targeting portable, instrumentation, and industrial control markets.

FAQ

What is the exact reset threshold voltage for MAX6742XKTD7?

The MAX6742XKTD7 has a factory-trimmed V_CC1 reset threshold of 3.075V (suffix "T"), with ±1.5% tolerance over -40°C to +85°C. This value is confirmed in Table 1 of the datasheet for MAX6742/MAX6745 devices. The PFI threshold remains fixed at 0.488V regardless of part number suffix. Both thresholds are tested and guaranteed-not typical values.

Does MAX6742XKTD7 include a manual reset input (MR) pin?

No, the MAX6742XKTD7 does not have a dedicated MR pin. Its pinout (Pin 3 = PFI, Pin 4 = PFO) differs from MR-equipped variants like MAX6736–MAX6739. Manual reset functionality is instead implemented via the open-drain RESET output's internal 50kΩ pullup to V_CC1, allowing direct pushbutton connection between RESET and GND-no MR pin required.

What is the purpose of the PFI and PFO pins on MAX6742XKTD7?

The PFI (Pin 3) and PFO (Pin 4) form an independent power-fail comparator: PFI accepts a divided-down voltage, and when it falls below 0.488V, PFO (open-drain, active-low) asserts immediately-without timeout-to signal impending supply collapse. This enables early system actions (e.g., data save) before the main V_CC1 reset triggers, a key differentiator of the MAX6742XKTD7 within the family.

Can MAX6742XKTD7 monitor negative voltages?

Yes, the MAX6742XKTD7 PFI input can monitor negative supplies using the circuit in Figure 4B of the datasheet: a resistor network referenced to V_CC1 converts negative voltage to a positive PFI input. When the negative rail is valid, PFO is low; as it collapses, PFO goes high. Accuracy depends on resistor matching and PFI threshold tolerance (±1.5%), but the topology is validated in the datasheet for MAX6742XKTD7.

What is the significance of the "D7" suffix in MAX6742XKTD7?

"D7" denotes the 1200ms minimum reset timeout period (t_RP), per Table 3. This is distinct from "D3" (150ms). The D7 option ensures extended processor hold time critical for complex boot sequences or flash write operations. All MAX6742XKTD7 units guarantee ≥1200ms timeout across temperature, with typical values of 1800ms at +25°C.