Analog Devices Inc./Maxim Integrated MAX6315US44D4+T

Overview

MAX6315US44D4+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 4.39V or when manual reset (MR) is asserted. It guarantees reset assertion for ≥1120ms after recovery, consumes only 5μA at 5.5V, and operates across -40°C to +125°C - used in battery-powered controllers and industrial μP systems requiring reliable brownout protection.

For engineers reviewing the MAX6315US44D4+T datasheet, MAX6315US44D4+T pinout, MAX6315US44D4+T application, or MAX6315US44D4+T equivalent, key selection criteria include factory-trimmed 4.39V reset threshold, 1120ms minimum timeout, SOT23-4 package compatibility, open-drain output capable of level-shifting above VCC, and guaranteed operation over extended temperature.

Technical Context

The MAX6315US44D4+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider setting nominal VTH = 4.39V ±3.5% over -40°C to +125°C, paired with a temperature-stable monostable timer generating ≥1120ms reset timeout. Its MR input includes 63kΩ internal pullup and 100ns glitch rejection.

Reset assertion is latched on VCC drop or MR low, and held for full tRP after VCC rises above VTH or MR deasserts. The open-drain RESET output sinks ≥1.2mA at VCC > 2.5V with VOL ≤ 0.3V, enabling interface with higher-voltage logic rails up to +6V via external pullup.

Key Specifications

Pinout & Package

MAX6315US44D4+T is housed in a RoHS-compliant 4-pin SOT23 package (outline 21-0052), footprint-compatible with industry-standard SOT23-4 land patterns (90-0183). Dimensions: 2.9mm × 1.6mm × 1.1mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US44D3+T and TPS3808G33DBVR, the MAX6315US44D4+T uniquely delivers 4.39V precision threshold with longest standard timeout (1120ms), enabling robust reset assurance in slow-ramping industrial power supplies without layout change from SOT23-4.

Availability

MAX6315US44D4+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6315US44D4+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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The MAX6315 series was designed specifically for cost-sensitive, space-constrained microprocessor supervision in industrial, automotive, and portable equipment - delivering factory-trimmed accuracy and guaranteed timing without external components.

FAQ

What is the exact reset threshold voltage for MAX6315US44D4+T?

The MAX6315US44D4+T has a factory-trimmed nominal reset threshold of 4.39V, with tolerance of ±3.5% over the full -40°C to +125°C operating range. This value is laser-trimmed during manufacturing and specified in the Electrical Characteristics table under "Reset Threshold (V_TH)" with test conditions confirming accuracy across temperature.

Does MAX6315US44D4+T require external components to function?

No, the MAX6315US44D4+T requires no external resistors or capacitors for basic operation. Its 4.39V threshold and 1120ms timeout are factory-programmed; MR includes a 63kΩ internal pullup; RESET is open-drain and only needs an external pullup resistor (e.g., 10kΩ) to the target logic rail - making it a true single-component solution.

Can MAX6315US44D4+T's RESET output interface with a 5V logic system while VCC is 3.3V?

Yes, the MAX6315US44D4+T's open-drain RESET output can be pulled up to any voltage between 0V and +6V, independent of VCC. So when VCC = 3.3V, connecting RESET to a 5V rail via a pullup resistor allows clean 5V-compatible reset signaling - a key feature confirmed in the Absolute Maximum Ratings and Detailed Description sections.

What is the minimum VCC required for MAX6315US44D4+T to assert RESET reliably?

The MAX6315US44D4+T guarantees RESET assertion down to VCC = 1.0V, as specified in the Operating Voltage Range (1.0V to 5.5V) and confirmed by the Electrical Characteristics table showing RESET sink capability at VCC > 1.0V with ISINK = 80μA and VOL ≤ 0.3V - enabling brownout detection deep into low-voltage decay.

How does the manual reset (MR) input behave on MAX6315US44D4+T?

On the MAX6315US44D4+T, MR is an active-low input with internal 63kΩ pullup to VCC. A logic-low pulse ≥1μs asserts RESET immediately and holds it active for the full 1120ms timeout after MR returns high. No external debounce components are needed, and MR can be left floating if unused - behavior explicitly documented in the Pin Description and Applications Information sections.