Analog Devices Inc./Maxim Integrated MAX6310UK40D2-T

Overview

MAX6310UK40D2-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.0V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert reset during power faults. It features 20ms 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 MAX6310UK40D2-T datasheet, MAX6310UK40D2-T pinout, MAX6310UK40D2-T application, or MAX6310UK40D2-T equivalent, key selection criteria include factory-trimmed 4.0V VCC threshold tolerance (±2.5% over -40°C to +85°C), dual external reset inputs with 1.23V reference, manual-reset capability, and immunity to sub-40µs VCC transients at 4.0V threshold overdrive.

Technical Context

The MAX6310UK40D2-T implements a triple-monitor architecture: internal factory-trimmed resistor divider sets nominal 4.0V VCC reset threshold; RST IN compares external voltage to 1.23V reference for configurable undervoltage detection; OVRST IN similarly enables overvoltage monitoring. All three comparators feed a shared reset generator with 20ms timeout.

Its push/pull active-low RESET output drives logic-level loads directly without external pull-up, supports 3.2mA sink at VCC > 4.25V, and maintains valid logic state across full operating temperature range (-40°C to +85°C). The MR input includes 63.5kΩ internal pull-up and accepts TTL/CMOS logic levels.

Key Specifications

Pinout & Package

MAX6310UK40D2-T is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts in portable and multivoltage systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6315-40ARTZ-R7, MAX6310UK40D2-T uniquely delivers triple-input supervision (VCC + RST IN + OVRST IN) in SOT23, enabling compact fault-tolerant designs for multivoltage systems without external components.

Availability

MAX6310UK40D2-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive body controllers, network routers, and multivoltage embedded systems requiring stable component supply and long-term production continuity.

Supply support for MAX6310UK40D2-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) designs precision analog and mixed-signal ICs for industrial, communications, and computing applications, emphasizing reliability and integration.

The MAX6305–MAX6313 family delivers programmable supervisory solutions for multivoltage systems, targeting applications requiring simultaneous monitoring of primary and auxiliary rails with minimal external components.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6310UK40D2-T?

The MAX6310UK40D2-T has a factory-trimmed VCC reset threshold of 4.000V with ±2.5% tolerance over the full –40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet (revision 6, page 8), where "40" in the part number corresponds to the 4.0V nominal threshold. The actual measured threshold falls between 3.900V and 4.100V at +25°C, and between 3.800V and 4.200V across temperature extremes. MAX6310UK40D2-T uses an internal resistor divider calibrated during wafer sort to achieve this precision.

Does MAX6310UK40D2-T support manual reset functionality?

Yes, MAX6310UK40D2-T includes a dedicated MR (manual reset) input on pin 3. Pulling MR low forces an immediate reset assertion, which remains active for the full 20ms timeout period after MR returns high. The pin features a 63.5kΩ internal pull-up resistor, allowing it to be left unconnected when unused. MAX6310UK40D2-T accepts TTL logic levels in 5V systems and CMOS levels in 3V systems, and its MR input is ESD-protected but requires the driving supply to match VCC to avoid violating absolute maximum ratings.

What are the electrical characteristics of the RESET output on MAX6310UK40D2-T?

The RESET output of MAX6310UK40D2-T is an active-low push/pull driver. At VCC > 4.25V, it sinks up to 3.2mA while maintaining VOL ≤ 0.4V; at VCC > 2.5V, it sinks 1.2mA with VOL ≤ 0.3V. Unlike open-drain variants, MAX6310UK40D2-T does not require an external pull-up resistor. The output remains valid down to VCC = 1V, ensuring reliable reset assertion during deep brownout conditions. This push/pull structure differentiates MAX6310UK40D2-T from MAX6305/MAX6306 series parts.

Can MAX6310UK40D2-T monitor voltages other than VCC?

Yes, MAX6310UK40D2-T provides two additional monitoring inputs: RST IN (pin 3) for configurable undervoltage detection and OVRST IN (pin 4) for overvoltage detection. Both compare external voltages to a precise 1.23V internal reference. By connecting resistor dividers, users can set custom thresholds - for example, a 3.3V rail monitored via RST IN using R1 = 1MΩ and R2 = 1.69MΩ yields a 3.3V threshold. MAX6310UK40D2-T's triple-input architecture enables comprehensive fault coverage beyond single-rail supervision.

What is the guaranteed reset timeout period for MAX6310UK40D2-T?

The MAX6310UK40D2-T guarantees a minimum reset timeout period of 20ms, corresponding to the "D2" suffix in its part number. Per the Electrical Characteristics table (page 3), tRP is specified as 20ms (min), 28ms (typ), and 40ms (max) over temperature. This factory-programmed delay ensures sufficient time for microprocessor initialization and memory stabilization before release, eliminating the need for external RC timing networks. The timeout begins only after all monitored supplies exceed their respective thresholds.