Analog Devices Inc./Maxim Integrated MAX6315US43D3+T

Overview

MAX6315US43D3+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 features a factory-trimmed 4.39V reset threshold, 140ms minimum reset timeout period, 5μA supply current at +25°C, and operates across –40°C to +125°C for use in battery-powered industrial controllers.

For engineers reviewing the MAX6315US43D3+T datasheet, MAX6315US43D3+T pinout, MAX6315US43D3+T application, or MAX6315US43D3+T equivalent, this page delivers verified electrical parameters, SOT23 package mapping, reset timing behavior under brownout and manual trigger conditions, and validated alternatives for μP power monitoring designs requiring guaranteed reset assertion during VCC decay.

Technical Context

The MAX6315US43D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its nominal 4.39V reset threshold, with ±3.5% tolerance over –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms (min) reset pulse after VCC recovers above threshold or MR deasserts.

It uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting up to +6V - independent of VCC - and includes a 63kΩ internal pullup on MR. Immunity to transients <100ns is ensured via built-in glitch rejection, and operation is guaranteed down to VCC = 1.0V with RESET sinking capability maintained.

Key Specifications

Pinout & Package

MAX6315US43D3+T is housed in a RoHS-compliant 4-pin SOT23 package (package code U4+1), with 1.3mm × 0.8mm footprint and 0.95mm height - optimized for space-constrained embedded modules and portable instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US43D3+T, MAX6315US43D3+T omits bidirectional reset support but offers simpler integration and lower system cost; versus TPS3808G33DBVR, it provides manual reset, VCC-level independence, and tighter threshold accuracy - critical for mixed-rail and safety-critical designs.

Availability

MAX6315US43D3+T is available at Aetrix Electronics and suitable for industrial motor 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 MAX6315US43D3+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 MAX6315 belongs to Analog Devices' precision supervisory IC product line, engineered specifically for reliable, low-power reset generation in microprocessor-based systems subject to brownout, startup instability, and manual intervention requirements.

FAQ

What is the exact reset threshold voltage of the MAX6315US43D3+T?

The MAX6315US43D3+T has a factory-trimmed nominal reset threshold voltage of 4.39V, with tolerance of ±3.5% over the full –40°C to +125°C operating temperature range. This value is laser-trimmed during manufacturing and documented in the Ordering Information table of the official Analog Devices datasheet. The MAX6315US43D3+T does not support user adjustment or external resistor programming of this threshold.

Does the MAX6315US43D3+T support manual reset functionality?

Yes, the MAX6315US43D3+T includes a dedicated MR (Manual Reset) input on Pin 3. A logic-low signal on MR asserts the RESET output for the full 140ms timeout period, even if VCC remains above threshold. The pin features an internal 63kΩ pullup resistor, allowing direct connection of a momentary switch to GND without external components. The MAX6315US43D3+T also rejects noise glitches shorter than 100ns.

Can the RESET output of the MAX6315US43D3+T be pulled up to a voltage higher than VCC?

Yes, the RESET output of the MAX6315US43D3+T is an open-drain structure rated for voltages up to +6.0V, independent of the VCC supply voltage. This allows the RESET signal to interface with higher-voltage logic domains - for example, pulling up to a 5V rail while monitoring a 3.3V VCC supply. The MAX6315US43D3+T maintains sink capability (≥3.2mA at VCC > 4.25V) under this configuration.

What is the minimum reset timeout period specified for the MAX6315US43D3+T?

The MAX6315US43D3+T is configured with a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full –40°C to +125°C temperature range, with typical values ranging from 200ms to 280ms depending on temperature and process variation. The timeout begins when VCC rises above the 4.39V threshold or when MR is deasserted.

Is the MAX6315US43D3+T compatible with the MAX811?

Yes, the MAX6315US43D3+T is pin-compatible with the MAX811 family per the manufacturer's Benefits and Features section. Both devices share the same 4-pin SOT23 footprint, VCC/GND/RESET/MR pinout, and open-drain RESET architecture. However, the MAX6315US43D3+T offers tighter threshold accuracy (±3.5% vs. ±5%), lower ICC (5μA vs. 10–20μA), and guaranteed operation to +125°C - making it a functional upgrade for new designs requiring enhanced performance.