Analog Devices Inc./Maxim Integrated MAX6326XR23+T

Overview

MAX6326XR23+T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.5V–5V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.32V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, 1µA max supply current at +25°C, and guaranteed operation down to VCC = 1.2V. It is used in portable battery-powered systems requiring reliable power-on reset with minimal quiescent current.

For engineers reviewing the MAX6326XR23+T datasheet, MAX6326XR23+T pinout, MAX6326XR23+T application, or MAX6326XR23+T equivalent, key selection criteria include reset threshold accuracy, push-pull output drive capability, SC70-3 package compatibility, and immunity to sub-100µs VCC transients - all critical for embedded µP reset integrity in space-constrained designs.

Technical Context

The MAX6326XR23+T implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC falling below 2.32V, triggering an active-low RESET output that remains asserted for ≥100ms after VCC recovers above threshold. Its internal reference is trimmed at wafer level to ±1.5% at +25°C and ±2.5% over –40°C to +85°C.

It operates across full VCC range (1.2V–5.5V), supports push-pull output with VOH ≥0.8·VCC (ISOURCE = 500µA) and VOL ≤0.3V (ISINK = 1.6mA), and rejects fast transients via built-in noise immunity - no external RC network required. The device is fully specified for industrial temperature range and requires zero external components.

Key Specifications

Pinout & Package

MAX6326XR23+T is housed in a 3-pin SC70-3 package (outline 21-0075), footprint-compatible with SOT23-3 but with smaller 1.25mm × 1.65mm body and 0.65mm lead pitch. This RoHS-compliant, lead-free package supports 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 MAX6326XR23+T, MAX809TR23+T consumes 3.5× more supply current and lacks SC70 packaging, while TPS3808G12DBVR trades push-pull simplicity for open-drain flexibility - making MAX6326XR23+T optimal for space- and current-constrained single-supervisor applications.

Availability

MAX6326XR23+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automated test equipment controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6326XR23+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, mixed-signal, and power management ICs for industrial, medical, communications, and consumer applications.

The MAX6326 family delivers ultra-low-power, factory-trimmed reset supervision for battery-operated and space-constrained embedded systems where reliability, accuracy, and minimal quiescent current are critical.

FAQ

What is the exact reset threshold voltage of MAX6326XR23+T and how tightly is it specified?

The MAX6326XR23+T has a factory-trimmed nominal reset threshold of 2.32V, guaranteed within ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating temperature range. This specification is confirmed in Table 1 of the datasheet and applies directly to the R23 suffix variant. The MAX6326XR23+T uses laser trimming for precision, eliminating need for external calibration.

Does MAX6326XR23+T require any external components to function?

No, the MAX6326XR23+T requires zero external components. Its internal voltage reference, comparator, and push-pull output driver are fully integrated. Unlike many reset ICs, it does not need an external pull-up resistor (due to push-pull output) or RC timing network (reset timeout is internally generated). This simplifies design and reduces BOM cost and PCB area.

What package type and footprint does MAX6326XR23+T use, and is it compatible with SOT23-3 layouts?

MAX6326XR23+T is supplied in a 3-pin SC70-3 package (outline 21-0075), measuring 1.25mm × 1.65mm with 0.65mm lead pitch. While pin-compatible in function (GND, RESET, VCC), its SC70 footprint is not mechanically interchangeable with SOT23-3 due to smaller body size and tighter pitch. Layouts must use the SC70 land pattern (90-0208) - not the SOT23 pattern (90-0179).

How does MAX6326XR23+T handle fast transients on the VCC supply line?

The MAX6326XR23+T incorporates inherent transient immunity: its reset comparator ignores negative-going VCC glitches shorter than ~100µs, depending on overdrive magnitude. As shown in Figure 4 of the datasheet, a 20mV overdrive (VTH − VCC) allows up to ~140µs transient rejection. This prevents false resets in electrically noisy environments without requiring external filtering.

What is the maximum supply voltage and minimum operating VCC for MAX6326XR23+T?

The MAX6326XR23+T operates with VCC from 1.2V to 5.5V across –40°C to +85°C. Absolute maximum rating is 6V, but functional operation is guaranteed only down to 1.2V (not 1.0V) under full temperature range per Electrical Characteristics table. At VCC = 1.2V, RESET remains valid and supply current stays within spec - enabling use during deep brownout recovery.