Analog Devices Inc./Maxim Integrated MAX6326XR22

Overview

MAX6326XR22 from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.2V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.20V reset threshold (±1.5% at +25°C, ±2.5% over –40°C to +85°C), 100ms minimum reset timeout, 1µA max supply current at 3V, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset supervision.

For engineers reviewing the MAX6326XR22 datasheet, MAX6326XR22 pinout, MAX6326XR22 application, or MAX6326XR22 equivalent, this page delivers verified specifications including reset threshold accuracy, temperature stability (40 ppm/°C tempco), transient immunity, SC70-3 package compatibility, and direct functional comparison with industry-standard µP reset ICs such as MAX809 and MAX810.

Technical Context

The MAX6326XR22 implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC drops below its 2.20V threshold. Its internal timing circuit guarantees a minimum 100ms reset assertion after VCC recovers, independent of supply ramp rate.

It uses a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC and sinking ≥1.6mA at ≤0.3V - eliminating external pull-up resistors. The device ignores fast VCC transients (e.g., <20µs negative glitches at 200mV overdrive) and remains fully functional down to 1.2V VCC.

Key Specifications

Pinout & Package

MAX6326XR22 is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, suitable for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MAX809TR22D3T-T and TPS3808G01QDBVRQ1, the MAX6326XR22 delivers the lowest guaranteed supply current (1µA max), exclusive SC70-3 packaging for miniaturized layouts, and factory-trimmed threshold accuracy without external components - making it optimal for cost-sensitive, size-constrained, and battery-limited designs where qualification beyond industrial grade is not required.

Availability

MAX6326XR22 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart utility meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6326XR22 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6326XR22 belongs to Maxim's ultra-low-power µP supervisory family, engineered specifically for battery-operated and space-constrained systems needing precise, single-supply reset functionality with minimal external components.

FAQ

What is the exact reset threshold voltage of the MAX6326XR22 and how does it vary with temperature?

The MAX6326XR22 has a factory-trimmed nominal reset threshold of 2.20V. At +25°C, this is guaranteed within ±1.5% (2.167V to 2.233V). Over the full industrial temperature range (–40°C to +85°C), the threshold remains within ±2.5% (2.145V to 2.250V). Its temperature coefficient is tightly controlled at 40 ppm/°C, ensuring predictable drift across operating conditions. This specification is confirmed in the Electrical Characteristics table of the official MAX6326 datasheet.

Does the MAX6326XR22 require an external pull-up resistor on its RESET pin?

No, the MAX6326XR22 does not require an external pull-up resistor. It features a push-pull output stage that actively drives the RESET pin both high and low. When reset is deasserted, the output sources ≥500µA at 0.8·VCC; when asserted, it sinks ≥1.6mA at ≤0.3V. This eliminates the need for external components, reducing BOM cost and PCB area - a key advantage over open-drain alternatives like the MAX6328XR22.

What package type and footprint does the MAX6326XR22 use, and is it compatible with automated assembly?

The MAX6326XR22 is supplied exclusively in the 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm. It is fully compatible with standard SMT pick-and-place equipment and reflow profiles. The SC70-3 footprint is distinct from SOT23-3 and requires dedicated land pattern design - confirmed in Maxim's Package Information document and supported by Aetrix Electronics' engineering library.

How does the MAX6326XR22 handle fast voltage transients on the VCC line?

The MAX6326XR22 incorporates internal transient filtering to reject short-duration negative-going VCC glitches. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", it ignores transients under ~20µs when the overdrive (VTH – VCC) is 200mV. This immunity prevents false resets caused by switching noise or load-dump events - a critical feature validated in the datasheet's Applications Information section.

Is the MAX6326XR22 pin-compatible with other members of the MAX6326/MAX6327/MAX6328 family?

Yes, the MAX6326XR22 shares identical pinout (GND, RESET, VCC), package (SC70-3), and electrical interface with all variants in the MAX6326/MAX6327/MAX6328 series - including different reset thresholds (e.g., R23, R24) and output types (push-pull vs. open-drain). This allows drop-in replacement during design iteration or supply chain substitution, provided the functional requirement (active-low push-pull) and threshold match the system's needs.