Analog Devices Inc./Maxim Integrated MAX6738XKVD3+T

Overview

The MAX6738XKVD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VTH1 = 2.925V) and one adjustable RSTIN input (488mV reference), open-drain active-low RESET output, manual reset input (MR), and SC70-5 package. It monitors primary supply VCC1 and secondary supply VCC2, asserts reset if either falls below threshold, and maintains reset for ≥150ms after recovery. It is used in portable battery-powered systems requiring reliable dual-rail power monitoring.

For engineers reviewing the MAX6738XKVD3+T datasheet, MAX6738XKVD3+T pinout, MAX6738XKVD3+T application, or MAX6738XKVD3+T equivalent, key selection criteria include its 2.925V/0.788V dual-threshold configuration, 6µA quiescent current, 150ms reset timeout, SC70-5 footprint, and support for external voltage divider-based monitoring down to 0.488V on RSTIN.

Technical Context

The MAX6738XKVD3+T implements two independent voltage monitoring channels: VCC1 (factory-set at 2.925V ±2.5%) and VCC2 (factory-set at 0.788V ±2.5%), both with 0.5% hysteresis. Its RSTIN input uses an internal 488mV precision reference to monitor third-party rails via resistor dividers.

Reset assertion is edge-triggered on falling VCC1/VCC2/RSTIN or MR low pulse (≥1µs), with internal timer restart capability upon re-fall before timeout completion. The open-drain RESET output requires an external pullup and sinks up to 3.2mA at VCC1 ≥4.25V with VOL ≤0.4V.

Key Specifications

Pinout & Package

MAX6738XKVD3+T is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm, 0.65mm pitch), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6738XKTD3+T, the MAX6738XKVD3+T offers lower VCC1 trip (2.925V vs. 3.075V) for earlier intervention on marginal 3.0V supplies; versus TPS3808G15DBVR, it provides integrated dual-threshold supervision and RSTIN flexibility at the cost of higher IQ, making it superior for multivoltage SoC platforms.

Availability

MAX6738XKVD3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply with guaranteed -40°C to +85°C operation and SC70-5 footprint compatibility.

Supply support for MAX6738XKVD3+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 connectivity in industrial, automotive, and consumer applications.

The MAX6736–MAX6745 family delivers ultra-low-power dual/triple-voltage supervision for space-constrained portable electronics, emphasizing factory-trimmed accuracy, adjustable monitoring, and minimal quiescent current.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6738XKVD3+T?

The MAX6738XKVD3+T has a factory-trimmed VCC1 reset threshold of 2.925V ±2.5% over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 of the datasheet under suffix "V", and applies specifically to the MAX6738XKVD3+T variant. The threshold is referenced to the VCC1 supply pin and includes 0.5% hysteresis to prevent chatter during slow supply ramps.

Does the MAX6738XKVD3+T support monitoring a 1.2V supply using the RSTIN pin?

Yes, the MAX6738XKVD3+T supports monitoring a 1.2V supply via the RSTIN pin using an external resistor divider. With its internal 488mV reference, a divider ratio of R1/R2 = (1.2V / 0.488V) − 1 ≈ 1.46 achieves precise trip at 1.2V. The MAX6738XKVD3+T's RSTIN input leakage (<10nA) ensures minimal error from divider current, enabling accurate low-power supervision without additional components.

What is the minimum pulse width required on the MR pin to trigger reset on the MAX6738XKVD3+T?

The MAX6738XKVD3+T requires a minimum MR input pulse width of 1µs to reliably assert the RESET output. This specification is guaranteed across the full operating temperature range (-40°C to +85°C) and is independent of VCC1 level. The MR pin features an internal 1.5kΩ pullup to VCC1, allowing direct connection to a pushbutton switch without external biasing components.

Is the RESET output of the MAX6738XKVD3+T push-pull or open-drain?

The RESET output of the MAX6738XKVD3+T is open-drain active-low. As confirmed in the Selector Guide and Pin Description, MAX6738 devices use open-drain RESET outputs requiring an external pullup resistor. The output can sink up to 3.2mA at VCC1 ≥4.25V with VOL ≤0.4V, supporting standard CMOS and TTL logic interfaces when paired with appropriate pullup values (e.g., 10kΩ for 3.3V systems).

What is the guaranteed reset timeout period for the MAX6738XKVD3+T?

The MAX6738XKVD3+T guarantees a minimum reset timeout period of 150ms, as indicated by the "D3" suffix in its part number. This value is specified in Table 3 and confirmed in Electrical Characteristics (tRP = 150ms min). The timeout begins after all monitored supplies (VCC1, VCC2, RSTIN) exceed their thresholds and remains valid across the full -40°C to +85°C temperature range with <±1.5% variation.