Analog Devices Inc./Maxim Integrated MAX6310UK46D3

Overview

The MAX6310UK46D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory circuit that monitors VCC (factory-set threshold 4.63V ±2.5%), one adjustable undervoltage input (RST IN), and one adjustable overvoltage input (OVRST IN), asserting an active-low push/pull RESET output when any monitored supply violates its threshold. It features a 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset.

For engineers reviewing the MAX6310UK46D3 datasheet, MAX6310UK46D3 pinout, MAX6310UK46D3 application, or MAX6310UK46D3 equivalent, key selection criteria include factory-trimmed 4.63V VCC threshold tolerance (±2.5% over -40°C to +85°C), dual external reset inputs with 1.23V reference, push/pull RESET drive capability, immunity to fast VCC transients, and compatibility with 3.3V/5V mixed-rail systems.

Technical Context

The MAX6310UK46D3 implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 4.63V nominal, plus two independent comparator inputs-RST IN (undervoltage) and OVRST IN (overvoltage)-each referenced to a precision 1.23V internal bandgap. All three comparators feed into a shared reset generator with a fixed 140ms minimum timeout (D3 variant).

Its push/pull RESET output drives high/low actively (no external pull-up required), sinks ≥1.2mA at VCC > 2.5V, and sources ≥500µA at VCC > 1.8V. The device operates across VCC = (VTH + 2.5%) to +5.5V (i.e., ≥4.75V min), supports manual reset via MR pin with internal 63.5kΩ pull-up, and rejects transients ≤200ns on all inputs per typical operating characteristics.

Key Specifications

Pinout & Package

MAX6310UK46D3 is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, tape-and-reel packaged.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable triple-input reset applications.

Compared with MAX6310EUK46D3, the MAX6310UK46D3 trades extended temperature support for lower cost and standard commercial qualification; compared with TPS3808G33DBVR, it provides triple-input supervision and push/pull drive - essential for complex multivoltage systems where external components and pin count must be minimized.

Availability

MAX6310UK46D3 is available at Aetrix Electronics and suitable for industrial PLC power sequencing, medical infusion pump supervision, and automotive body control module applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX6310UK46D3 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, medical, and communications applications.

The MAX6305–MAX6313 family was designed to provide compact, low-power, multi-rail supervisory solutions for embedded systems with mixed 3.3V/5V/12V supplies - emphasizing precision threshold accuracy, transient immunity, and minimal external component count.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6310UK46D3?

The MAX6310UK46D3 has a factory-trimmed VCC reset threshold of 4.63V, with a tolerance of ±2.5% over the operating temperature range of -40°C to +85°C. This value is confirmed in Table 1 of the datasheet (revision 6, page 8), where "46" corresponds to 4.63V nominal. The device monitors VCC directly via an internal resistor divider calibrated to this threshold.

Does MAX6310UK46D3 support manual reset functionality?

Yes, the MAX6310UK46D3 includes a manual reset (MR) input on pin 3. A logic-low pulse ≥1.5µs on MR forces RESET assertion for the full 140ms timeout period after MR returns high. The MR pin features an internal 63.5kΩ pull-up resistor, allowing it to be left unconnected or tied to VCC when unused. It accepts TTL- or CMOS-level inputs depending on system voltage.

What are the voltage ranges for the RST IN and OVRST IN inputs on MAX6310UK46D3?

The RST IN and OVRST IN inputs on MAX6310UK46D3 compare external voltages to a precision 1.23V internal reference. RST IN asserts RESET when its voltage falls below 1.23V; OVRST IN asserts RESET when its voltage exceeds 1.23V. Input leakage is ±25nA, enabling megohm-level resistor dividers. Both inputs reject transients <200ns as verified in typical operating characteristics (Figures 6305 TOC03 and 6305 TOC04).

Can MAX6310UK46D3 operate with a 3.3V supply?

No, the MAX6310UK46D3 cannot operate from a 3.3V supply. Its minimum operating VCC is defined as VTH + 2.5% = 4.63V × 1.025 ≈ 4.75V. It is designed exclusively for 5V systems where the monitored rail is near 5V. For 3.3V-only applications, consider the MAX6309 series (e.g., MAX6309UK33D3) which features a 3.30V factory threshold and matching 140ms timeout.

Is the RESET output of MAX6310UK46D3 push/pull or open-drain?

The RESET output of MAX6310UK46D3 is active-low push/pull. As confirmed in the Pin Description (page 5) and Electrical Characteristics table (page 2), it both sources and sinks current - driving low to assert reset and actively pulling high to deassert. This eliminates the need for an external pull-up resistor and ensures robust interfacing with µP reset pins across varying load conditions.