Analog Devices Inc./Maxim Integrated MAX6315US35D3+T

Overview

MAX6315US35D3+T from Analog Devices 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 3.5V (±3.5% over -40°C to +125°C) or when manual reset (MR) is asserted. It guarantees reset assertion for ≥140ms after VCC recovery or MR release, supports VCC from 1.0V to 5.5V, draws only 5μA typical supply current at 5.5V, and operates across -40°C to +125°C - used in battery-powered controllers and industrial μP systems requiring reliable brownout detection.

For engineers reviewing the MAX6315US35D3+T datasheet, MAX6315US35D3+T pinout, MAX6315US35D3+T application, or MAX6315US35D3+T equivalent, this page delivers verified electrical parameters, SOT23-4 package mapping, factory-trimmed 3.5V threshold behavior, 140ms minimum timeout timing, and design-critical open-drain RESET output compatibility with supplies up to 6V.

Technical Context

The MAX6315US35D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider setting nominal VTH = 3.5V, ±3.5% tolerance over full temperature range. Its internal timer initiates on VCC rise above VTH or MR deassertion and holds RESET low for a fixed 140ms (min) timeout period.

It features an open-drain n-channel MOSFET RESET output capable of sinking 3.2mA at VCC > 4.25V while tolerating pullup voltages up to 6V - enabling level-shifting between monitored and reset logic domains. MR includes a 63kΩ internal pullup and rejects transients <100ns.

Key Specifications

Pinout & Package

MAX6315US35D3+T is housed in a RoHS-compliant 4-pin SOT23 package (outline 21-0052, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, suitable for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US35D2+T and TPS3808G33DBVR, the MAX6315US35D3+T uniquely combines a precise 3.5V reset threshold, 140ms minimum timeout, 4-pin SOT23 footprint, and internal MR pullup - making it optimal for space-constrained industrial controllers needing extended reset hold time without external components.

Availability

MAX6315US35D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6315US35D3+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The MAX6315US35D3+T belongs to the MAX6315 supervisory circuit family, engineered for cost-sensitive, space-constrained μP systems requiring guaranteed power-on reset, brownout protection, and manual reset capability with zero external components.

FAQ

What is the exact reset threshold voltage of the MAX6315US35D3+T?

The MAX6315US35D3+T has a factory-trimmed nominal reset threshold of 3.5V, with tolerance of ±3.5% over the full operating temperature range (-40°C to +125°C). This means the actual trip point falls between 3.3775V and 3.6225V under worst-case conditions, ensuring consistent brownout detection across industrial environments. The MAX6315US35D3+T achieves this via laser-trimmed internal resistors, eliminating need for external calibration.

Does the MAX6315US35D3+T require external components to operate?

No, the MAX6315US35D3+T operates autonomously with no external components required: its 3.5V threshold is factory-set, MR includes a 63kΩ internal pullup, and RESET is open-drain requiring only a single external pullup resistor (e.g., 10kΩ). Unlike adjustable supervisors, the MAX6315US35D3+T eliminates external resistors, capacitors, and trimming steps - reducing BOM cost and PCB area while improving reliability.

What is the minimum reset timeout period specified for the MAX6315US35D3+T?

The MAX6315US35D3+T guarantees a minimum reset timeout period (t_RP) of 140ms after VCC rises above the 3.5V threshold or after MR is released. This value is tested and specified over -40°C to +125°C, with typical values reaching 200ms at +25°C. The MAX6315US35D3+T uses an internal oscillator-based timer, ensuring stable timing independent of external R/C variations.

Can the RESET output of the MAX6315US35D3+T be pulled up to a voltage higher than VCC?

Yes, the RESET output of the MAX6315US35D3+T is an open-drain structure rated for up to 6.0V, allowing it to be pulled up to a voltage higher than VCC (e.g., 5V logic rail while monitoring a 3.3V VCC). This enables level-shifting functionality critical in mixed-supply systems. The MAX6315US35D3+T sinks up to 3.2mA at VCC > 4.25V, supporting standard TTL/CMOS logic thresholds.

Is the MAX6315US35D3+T compatible with microcontrollers that have bidirectional reset pins?

No, the MAX6315US35D3+T is not recommended for μCs with bidirectional reset pins (e.g., certain ARM or Renesas devices), as its open-drain RESET output lacks drive strength for bidirectional signaling and does not support internal pullup control. For such applications, Analog Devices specifies the MAX6314 series instead. The MAX6315US35D3+T is designed exclusively for standard active-low, unidirectional reset inputs.