Analog Devices Inc./Maxim Integrated MAX6468XS26D1

Overview

MAX6468XS26D1 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-5 package, monitoring VCC1 (primary supply) at 2.625V ±1.5% and VCC2 (secondary supply) at 1.620V ±1.5%, with 1.1ms minimum reset timeout, push-pull active-low RST output, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used for reliable power-up sequencing and brownout protection in battery-powered embedded systems.

For engineers reviewing the MAX6468XS26D1 datasheet, MAX6468XS26D1 pinout, MAX6468XS26D1 application, or MAX6468XS26D1 equivalent, key selection criteria include dual-threshold accuracy, low 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with 1.8V/1.2V multivoltage rail architectures requiring deterministic reset assertion.

Technical Context

The MAX6468XS26D1 implements two independent voltage comparators with factory-trimmed thresholds (VTH1 = 2.625V, VTH2 = 1.620V), each referenced to a precision internal bandgap and featuring 20ppm/°C tempco and 0.5% hysteresis. It asserts an active-low push-pull reset when either supply falls below its threshold and holds reset for ≥1.1ms after both supplies recover.

Its RST output drives directly to VCC1 (no external pullup required), operates with valid logic states down to VCC1/VCC2 = 0.8V, and includes MR input with 50kΩ internal pullup and 1µs minimum pulse width support - enabling robust manual reset integration without external components.

Key Specifications

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, thermal pad optional. RoHS-compliant, lead-free per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G125DBVR and ADM6705ARTZ-REEL7, MAX6468XS26D1 delivers tighter dual-threshold accuracy (±1.5%), integrated push-pull output eliminating BOM overhead, and shorter 1.1ms timeout optimized for fast-boot MCUs - making it superior for space-constrained, multirail battery devices demanding deterministic reset behavior.

Availability

MAX6468XS26D1 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, point-of-sale terminals, smart home hubs, and battery-backed real-time clocks requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6468XS26D1 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, automotive, and communications applications.

The MAX6468XS26D1 belongs to Maxim's µP supervisory family, designed specifically for deterministic power-monitoring in multivoltage embedded systems where reliability, small size, and ultra-low quiescent current are critical.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6468XS26D1?

The MAX6468XS26D1 has a factory-trimmed VCC1 reset threshold of 2.625V with ±1.5% tolerance over -40°C to +85°C. This value is confirmed in the Reset Voltage Threshold Suffix Guide where "S" corresponds to 2.625V (falling). The MAX6468XS26D1 uses this precise threshold to detect brownout on 2.8V nominal rails before critical logic failure occurs.

Does the MAX6468XS26D1 support manual reset functionality?

Yes, the MAX6468XS26D1 includes an active-low manual reset (MR) input on Pin 3 with an internal 50kΩ pullup to VCC1. A logic-low pulse ≥1µs on MR forces reset assertion for the full timeout period (≥1.1ms). No external components are required, and MR accepts standard TTL/CMOS logic levels - simplifying integration into MAX6468XS26D1-based systems.

What package type and pin count does the MAX6468XS26D1 use?

The MAX6468XS26D1 is packaged in a 5-pin SOT23-5 case (2.9mm × 1.6mm × 1.1mm), with pins assigned as RST (1), GND (2), MR (3), VCC2 (4), and VCC1 (5). This compact footprint matches industry-standard pick-and-place tooling and supports high-density PCB layouts where space is constrained - a key advantage of the MAX6468XS26D1 in portable electronics.

Is the reset output of the MAX6468XS26D1 push-pull or open-drain?

The MAX6468XS26D1 features a push-pull active-low reset output (RST) on Pin 1, referenced to VCC1. It drives low to ≤0.4V at 3.2mA sink current (VCC1 ≥ 4.5V) and high to ≥0.8×VCC1 when deasserted. This eliminates the need for an external pullup resistor - a distinguishing feature of the MAX6468XS26D1 versus open-drain alternatives that increase BOM cost and layout complexity.

What is the minimum reset timeout period specified for the MAX6468XS26D1?

The MAX6468XS26D1 has a minimum reset timeout period of 1.1ms, denoted by the "D1" suffix in its part number. This value is guaranteed over temperature and supply voltage variations, ensuring sufficient hold time for oscillator stabilization in 8-bit and 16-bit microcontrollers - a critical timing parameter validated in the MAX6468XS26D1 electrical characteristics table.