Analog Devices Inc./Maxim Integrated MAX6310EUK46D3+

Overview

MAX6310EUK46D3+ from Maxim Integrated is a precision 5-pin SOT23 programmable supervisory circuit that monitors VCC (factory-set 4.6V reset threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN), asserting a push/pull active-low RESET output when any monitored supply violates its threshold. It features 140ms minimum reset timeout, 8µA supply current, and guaranteed operation down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset.

For engineers reviewing the MAX6310EUK46D3+ datasheet, MAX6310EUK46D3+ pinout, MAX6310EUK46D3+ application, or MAX6310EUK46D3+ equivalent, key selection criteria include factory-trimmed 4.6V VCC threshold tolerance (±2.5% over –40°C to +85°C), dual external reset inputs with 1.20V–1.26V reference, manual-reset compatibility, transient immunity up to 280µs at 4.6V overdrive, and SOT23-5 footprint compatibility with industrial temperature range.

Technical Context

The MAX6310EUK46D3+ implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 4.6V nominal, independent comparator for RST IN referenced to 1.23V, and separate comparator for OVRST IN also referenced to 1.23V. All three comparators feed into a shared reset generator with programmable 140ms timeout.

Its push/pull RESET output drives low (VOL ≤ 0.3V at ISINK = 1.2mA) and high (VOH ≥ 0.8 × VCC at ISOURCE = 500µA) without external pull-up, enabling direct interface to 3.3V/5V µP reset pins. The MR input includes a 63.5kΩ internal pull-up and supports TTL/CMOS logic levels.

Key Specifications

Pinout & Package

MAX6310EUK46D3+ is housed in a lead-free 5-pin SOT23 package (package code U5+1, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6310EUK46D2+, the MAX6310EUK46D3+ provides longer reset hold time essential for complex processors; compared with TPS3808G33DBVR, it delivers unique triple-input supervision (VCC + RST IN + OVRST IN) enabling coordinated multivoltage system reset and overvoltage fault response.

Availability

MAX6310EUK46D3+ is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical portable monitors, and industrial IoT gateways requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6310EUK46D3+ 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, automotive, communications, and computing markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, low-power systems requiring factory-programmed thresholds, external rail monitoring, and robust transient immunity.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6310EUK46D3+?

The MAX6310EUK46D3+ has a factory-trimmed VCC reset threshold of 4.6V nominal, with guaranteed tolerance of ±2.5% over the full –40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" in the part number. The actual measured threshold at +25°C falls between 4.514V and 4.746V.

Does MAX6310EUK46D3+ support overvoltage detection on external supplies?

Yes, MAX6310EUK46D3+ includes a dedicated OVRST IN pin that asserts RESET when the applied voltage exceeds the internal 1.23V reference. By connecting a resistor divider from the external supply to OVRST IN and GND, users can configure overvoltage trip points - for example, a 12V rail monitored for >15.5V faults. This function is explicitly documented for MAX6310 in the Pin Description and Detailed Description sections.

What is the reset timeout period programmed into MAX6310EUK46D3+?

The "D3" suffix in MAX6310EUK46D3+ specifies a factory-programmed minimum reset timeout period of 140ms. Electrical Characteristics table confirms tRP = 140ms (min), 200ms (typ), 280ms (max) at TA = –40°C to +85°C. This timeout begins after all monitored supplies exceed their thresholds and ensures sufficient hold time for microprocessor initialization sequences.

Can MAX6310EUK46D3+ operate with VCC below 2.5V?

Yes, MAX6310EUK46D3+ guarantees valid RESET output down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Unlike some supervisors that disable below 2.5V, this device maintains functional reset assertion during brownout conditions, supporting graceful system shutdown in battery-depleted scenarios.

Is the MR (manual reset) input on MAX6310EUK46D3+ compatible with 3.3V logic?

Yes, the MR input on MAX6310EUK46D3+ accepts CMOS-level signals and is compatible with 3.3V logic. Its VIH threshold scales with VCC: when VTH < 4.0V (true for 4.6V part), VIH = 0.7 × VCC ≈ 3.22V minimum. With internal 63.5kΩ pull-up, MR can be driven directly by 3.3V GPIOs or open-drain outputs without level-shifting circuitry.