Analog Devices Inc./Maxim Integrated MAX6307UK46D3

Overview

MAX6307UK46D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.6V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert reset during power faults. It features 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. Used in multivoltage embedded systems for reliable brownout protection.

For engineers reviewing the MAX6307UK46D3 datasheet, MAX6307UK46D3 pinout, MAX6307UK46D3 application, or MAX6307UK46D3 equivalent, key selection criteria include its dual external reset inputs, factory-trimmed 4.6V VCC threshold with ±2.5% tolerance over temperature, 140ms timeout, open-drain active-low RESET output, and immunity to fast VCC transients up to 280µs at 4.6V overdrive.

Technical Context

The MAX6307UK46D3 implements a triple-monitor architecture: internal factory-trimmed resistor divider sets VCC reset threshold at 4.6V (±2.5% over –40°C to +85°C), while RST IN and OVRST IN accept externally programmed thresholds via resistor dividers referenced to 1.23V internal bandgap. All three comparators feature built-in hysteresis (2.5mV) and transient immunity.

Reset assertion follows a state-based logic: RESET remains active until all monitored voltages exceed their respective thresholds, then holds for the factory-programmed 140ms timeout (min). The open-drain RESET output sinks ≥3.2mA at VCC > 4.25V and remains valid down to VCC = 1V, enabling robust interface with µP reset pins requiring active-low assertion.

Key Specifications

Pinout & Package

MAX6307UK46D3 is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts and reflow-compatible assembly. Pin 1 is RESET (active-low open-drain), Pin 2 is GND, Pin 3 is OVRST IN, Pin 4 is RST IN, and Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6309UK46D3 and TLV809E46DBZR, the MAX6307UK46D3 uniquely supports triple-rail supervision in one device - enabling coordinated reset across primary, auxiliary, and safety-critical supplies without additional ICs or timing mismatches.

Availability

MAX6307UK46D3 is available at Aetrix Electronics and suitable for industrial PLC power monitoring, 5V/3.3V dual-rail embedded controllers, portable medical diagnostic devices, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6307UK46D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.

The MAX6305–MAX6313 family was designed specifically for multivoltage system supervision - delivering precision reset generation with integrated external monitoring inputs to replace discrete solutions in space- and power-constrained embedded systems.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6307UK46D3?

The MAX6307UK46D3 has a factory-trimmed VCC reset threshold of 4.6V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +85°C. This value is permanently set during manufacturing using laser trimming of an internal resistor divider and cannot be adjusted in-circuit. The "46" in the part number explicitly denotes the 4.6V threshold per Maxim's ordering convention.

Does MAX6307UK46D3 support manual reset functionality?

No, the MAX6307UK46D3 does not include a manual reset (MR) input. Unlike the MAX6306/MAX6309/MAX6312 variants, the MAX6307/MAX6310/MAX6313 family omits the MR pin to accommodate the dedicated OVRST IN function. Its reset assertion is triggered exclusively by VCC, RST IN, or OVRST IN voltage violations - not by external logic or push-button signals.

How is the 140ms reset timeout period implemented in MAX6307UK46D3?

The 140ms minimum reset timeout in MAX6307UK46D3 is factory-programmed using on-chip RC timing elements and is not user-adjustable. Per Maxim's ordering nomenclature, the "D3" suffix specifies the 140ms (min) timeout option. This internal timer begins counting only after all monitored voltages (VCC, RST IN, OVRST IN) have exceeded their respective thresholds and ensures reset remains asserted for ≥140ms before deassertion.

Can MAX6307UK46D3 monitor a 3.3V supply using its RST IN pin?

Yes, the RST IN pin of MAX6307UK46D3 accepts an externally programmed undervoltage threshold via a resistor divider referenced to its internal 1.23V bandgap. To monitor a 3.3V rail at 2.97V (–10%), use R1 = 1.0MΩ and R2 = 1.62MΩ, yielding VTH = (R1+R2)/R2 × 1.23V ≈ 2.97V. Input leakage (±25nA) introduces <±25mV error with these values, well within typical design margins.

What is the maximum VCC voltage the MAX6307UK46D3 can safely operate with?

The MAX6307UK46D3 has an absolute maximum VCC rating of +6V, but its functional operating range is limited to VCC = (4.6V × 1.025) to +5.5V = 4.713V to 5.5V. This lower bound ensures the internal factory-trimmed divider accurately compares against the 4.6V threshold. Operation below 4.713V may result in premature or spurious reset assertion due to comparator headroom limitations.