Analog Devices Inc./Maxim Integrated MAX6315US44D1

Overview

MAX6315US44D1 from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an open-drain active-low RESET signal when voltage falls below 4.39V or when manual reset (MR) is asserted. It features a factory-trimmed 4.39V reset threshold, 1ms minimum reset timeout period, −40°C to +125°C operating range, and SOT143 package. It is used in portable equipment and critical µP power monitoring where precise brownout detection and minimal quiescent current are required.

For engineers reviewing the MAX6315US44D1 datasheet, MAX6315US44D1 pinout, MAX6315US44D1 application, or MAX6315US44D1 equivalent, key selection criteria include reset threshold accuracy (±1.8% over temperature), 5µA supply current at +25°C, immunity to sub-1µs VCC transients, open-drain output capable of level-shifting above VCC, and guaranteed operation across automotive-grade temperature extremes.

Technical Context

The MAX6315US44D1 implements a precision voltage-monitoring comparator with laser-trimmed internal resistors to set its nominal 4.39V reset threshold, with ±1.8% tolerance over −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 1ms (min) reset timeout after VCC rises above threshold or MR deasserts.

It uses an open-drain n-channel MOSFET for RESET output, enabling pull-up to any voltage ≤6V - including supplies higher than VCC - and includes an internal 63kΩ pull-up on MR. The device remains functional down to VCC = 1.0V and rejects transients <1µs duration when VCC dips up to 100mV below threshold.

Key Specifications

Pinout & Package

MAX6315US44D1 is housed in a lead-free or leaded SOT143 (4-pin) surface-mount package, measuring 2.9mm × 1.5mm × 1.1mm, with gull-wing leads and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US44D1-T, the MAX6315US44D1 offers open-drain flexibility for multi-voltage systems; compared with TPS3808G12DBVR, it delivers tighter threshold accuracy, lower current, and integrated MR - making it optimal for space-constrained, battery-sensitive, and automotive-qualified designs.

Availability

MAX6315US44D1 is available at Aetrix Electronics and suitable for portable medical monitors, automotive body control modules, industrial PLC I/O modules, smart energy meters, and other applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6315US44D1 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 demanding industrial, automotive, and computing applications.

The MAX6315 family was developed specifically for high-reliability microprocessor supervision in harsh environments, emphasizing factory-trimmed accuracy, ultra-low power, and robust transient immunity - with MAX6315US44D1 targeting 4.39V brownout detection in extended-temperature systems.

FAQ

What is the exact reset threshold voltage of the MAX6315US44D1?

The MAX6315US44D1 has a factory-trimmed nominal reset threshold of 4.39V, with a tolerance of ±1.8% over the full −40°C to +125°C operating temperature range. This value is laser-trimmed during production and documented in the Ordering Information table; it is not adjustable and applies specifically to the MAX6315US44D1 variant, not the broader MAX6315 family.

Does the MAX6315US44D1 support manual reset functionality?

Yes, the MAX6315US44D1 includes a dedicated MR (manual reset) input on Pin 3. A logic-low signal on MR asserts the RESET output immediately and holds it active for the full 1ms timeout period after MR returns high. An internal 63kΩ pull-up resistor allows MR to be left unconnected if manual reset is not required.

Can the RESET output of the MAX6315US44D1 be pulled up to a voltage higher than VCC?

Yes, the MAX6315US44D1 features an open-drain RESET output rated to 6.0V, allowing it to be pulled up to any voltage between 0V and 6V - including supplies higher than the VCC rail (e.g., pulling RESET to 5V while VCC = 3.3V). This enables level-shifting without external components, a key feature confirmed in the Pin Description and Typical Operating Circuit.

What is the minimum VCC voltage at which the MAX6315US44D1 remains functional?

The MAX6315US44D1 guarantees RESET output behavior down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below this, the device may not assert or maintain RESET reliably. Its operational VCC range is 1.0V to 5.5V, and it continues to monitor and respond to brownout conditions across this entire span.

Is the MAX6315US44D1 pin-compatible with other devices in the MAX6315 family?

Yes, all MAX6315 variants - including MAX6315US44D1 - share identical SOT143 pinout (GND, RESET, MR, VCC) and footprint. Differences are limited to reset threshold voltage, timeout period, and temperature grade - all implemented internally. No PCB layout change is needed when substituting within the same D1 temperature grade (−40°C to +125°C).