Analog Devices Inc./Maxim Integrated MAX6307UK45D2-T

Overview

MAX6307UK45D2-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.5V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert an active-low push/pull RESET output. It features 20ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. Used in multivoltage embedded systems for reliable power-on and brownout reset generation.

For engineers reviewing the MAX6307UK45D2-T datasheet, MAX6307UK45D2-T pinout, MAX6307UK45D2-T application, or MAX6307UK45D2-T equivalent, key selection considerations include its dual-input monitoring capability (VCC + RST IN + OVRST IN), factory-trimmed 4.5V VCC threshold with ±2.5% tolerance over temperature, 20ms reset timeout, push/pull output drive, and SOT23-5 package compatibility with space-constrained designs.

Technical Context

The MAX6307UK45D2-T implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 4.5V nominal, external resistor-divider referenced comparator for RST IN (undervoltage), and another for OVRST IN (overvoltage). All three inputs feed into a shared reset generator with a fixed 20ms timeout period (D2 variant).

Its push/pull RESET output guarantees VOL ≤ 0.3V at ISINK = 1.2mA and VOH ≥ 0.8 × VCC at ISOURCE = 150µA, enabling direct interface with 3.3V/5V µP reset pins without external pull-up. Immunity to fast transients is achieved via internal filtering and hysteresis (2.5mV on RST IN/OVRST IN; VTH hysteresis = 2 × VTH).

Key Specifications

Pinout & Package

SOT23-5 package: ultra-compact surface-mount outline (2.9mm × 1.6mm × 1.1mm), lead-free compatible (-T suffix), thermal pad optional, rated for 571mW at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6307UK45D3-T and TPS3808G33DBVR, the MAX6307UK45D2-T uniquely delivers triple-rail supervision (VCC + RST IN + OVRST IN) in a 5-pin SOT23 with push/pull drive and 20ms timing - making it optimal for compact multivoltage systems requiring deterministic, component-minimized reset control.

Availability

MAX6307UK45D2-T is available at Aetrix Electronics and suitable for industrial PLCs, medical handhelds, automotive infotainment units, network routers, and portable instrumentation requiring stable component supply and guaranteed long-term sourcing.

Supply support for MAX6307UK45D2-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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained systems, offering factory-programmed thresholds, multiple input monitoring, and robust transient immunity without external components.

FAQ

What is the exact factory-set VCC reset threshold for MAX6307UK45D2-T?

The MAX6307UK45D2-T has a factory-trimmed VCC reset threshold of 4.5V nominal, with guaranteed tolerance of ±2.5% over the operating temperature range of 0°C to +70°C. This value is laser-trimmed during production and documented in Table 1 of the MAX6305–MAX6313 datasheet. The "45" in the part number explicitly denotes the 4.5V threshold, and the device asserts RESET when VCC falls below this level.

Does MAX6307UK45D2-T support monitoring of both undervoltage and overvoltage on external rails?

Yes, the MAX6307UK45D2-T supports simultaneous undervoltage monitoring on RST IN and overvoltage monitoring on OVRST IN, in addition to its factory-set 4.5V VCC supervision. Each input compares the external voltage to a precise 1.23V internal reference, allowing design-in of custom thresholds using resistor dividers. This triple-monitor capability is confirmed in the Pin Description and Detailed Description sections of the official datasheet.

What is the function of the RESET pin on MAX6307UK45D2-T, and what drive strength does it provide?

The RESET pin on MAX6307UK45D2-T is an active-low push/pull output. It actively drives low (VOL ≤ 0.3V at 1.2mA sink) and actively drives high (VOH ≥ 0.8 × VCC at 150µA source), eliminating the need for an external pull-up resistor. This allows direct connection to µP reset pins, including bidirectional interfaces like the Motorola 68HC11, as verified in the Applications Information section of the datasheet.

Can MAX6307UK45D2-T operate reliably when VCC drops below 2.5V?

Yes, the MAX6307UK45D2-T guarantees valid RESET assertion down to VCC = 1V, as explicitly stated in the Features list and Electrical Characteristics table. Unlike some supervisors that disable below 2.5V, this device maintains functional reset generation throughout deep brownout conditions - a key specification confirmed in the Absolute Maximum Ratings and Detailed Description sections.

What is the purpose of the D2 suffix in MAX6307UK45D2-T, and how does it affect system timing?

The "D2" suffix in MAX6307UK45D2-T specifies a factory-programmed reset timeout period of 20ms minimum. This defines the minimum duration RESET remains asserted after all monitored supplies return to regulation. The 20ms value is critical for ensuring stable clock acquisition and power supply settling in µPs and FPGAs, and is one of four standard timeout options (D1=1ms, D2=20ms, D3=140ms, D4=1120ms) defined in the Ordering Information section.