Analog Devices Inc./Maxim Integrated MAX6313UK46D3

Overview

MAX6313UK46D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.63V threshold), RST IN (undervoltage), and OVRST IN (overvoltage) to assert an active-high push/pull RESET signal during power faults. It features 140ms minimum reset timeout, 8µA supply current, and guaranteed operation down to VCC = 1.0V - used in multivoltage embedded systems requiring reliable brownout and overvoltage protection.

For engineers reviewing the MAX6313UK46D3 datasheet, MAX6313UK46D3 pinout, MAX6313UK46D3 application, or MAX6313UK46D3 equivalent, key selection criteria include its triple-input monitoring architecture (VCC + RST IN + OVRST IN), factory-trimmed 4.63V ±1.5% VCC threshold, 140ms reset timeout, immunity to sub-200ns transients, and compatibility with 3.3V/5V mixed-rail systems.

Technical Context

The MAX6313UK46D3 implements a triple-comparator architecture: one internal factory-trimmed divider for VCC monitoring at 4.63V, one adjustable comparator referenced to 1.23V for external RST IN undervoltage detection, and a second 1.23V-referenced comparator for OVRST IN overvoltage detection. All comparators feature 2.5mV hysteresis and reject transients under 200ns.

Its push/pull RESET output sources ≥0.8×VCC at 10µA and sinks ≤0.3V at 500µA, remains valid down to VCC = 1.0V, and integrates a 140ms minimum timeout timer that resets on any fault condition and restarts only after all inputs return to regulation - ensuring robust sequencing in portable and industrial controllers.

Key Specifications

Pinout & Package

SOT23-5 package (U5-1 code), 5-pin surface-mount, lead-free compatible, footprint identical to industry-standard SOT23.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6313UK46D2 and TPS3808G33DBVR, the MAX6313UK46D3 uniquely delivers triple-input monitoring (VCC + RST IN + OVRST IN) with factory-set 4.63V threshold and 140ms timeout - making it the only option among the three suitable for safety-critical 5V/24V mixed-rail systems requiring overvoltage fault detection.

Availability

MAX6313UK46D3 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body control modules, test equipment, and portable battery-powered instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6313UK46D3 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 power, sensing, and interface applications - with emphasis on reliability, low power, and integration for demanding industrial and medical markets.

The MAX6305–MAX6313 family was engineered specifically for multivoltage system supervision, combining VCC monitoring, adjustable undervoltage/overvoltage inputs, and programmable timeouts in ultra-small SOT23 packages - targeting portable, automotive, and industrial embedded control.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6313UK46D3?

The MAX6313UK46D3 has a factory-trimmed VCC reset threshold of 4.63V with ±1.5% tolerance at +25°C, confirmed in Table 1 of the datasheet and ordering guide. This value corresponds to the "46" suffix and is implemented via an internal precision resistor divider - no external calibration is required or supported.

Does MAX6313UK46D3 include a manual reset (MR) input?

No, the MAX6313UK46D3 does not include a manual reset input. Per the Selector Table and Pin Configurations section, MR is present only on MAX6306/MAX6309/MAX6312 variants. The MAX6313 pinout (SOT23-5 pins 1–5) explicitly lists RESET, GND, OVRST IN, RST IN, and VCC - with no MR terminal allocated.

What is the guaranteed operating temperature range for MAX6313UK46D3?

The MAX6313UK46D3 is specified for operation from -40°C to +85°C, as indicated by the "E" prefix in the full orderable part number MAX6313EUK46D3-T. This extended industrial temperature grade is confirmed in the Ordering Information table and Absolute Maximum Ratings section.

How does the 140ms reset timeout period (D3) function in MAX6313UK46D3?

The D3 suffix denotes a minimum 140ms reset timeout period. When any monitored input (VCC, RST IN, or OVRST IN) violates its threshold, RESET asserts high and remains asserted for ≥140ms after all inputs return to regulation. The timer resets instantly on any subsequent fault - ensuring robust hold-off during unstable power conditions.

Can MAX6313UK46D3 monitor both undervoltage and overvoltage on the same external rail?

Yes, MAX6313UK46D3 can monitor both conditions on a single external rail using RST IN for undervoltage and OVRST IN for overvoltage detection. Each input references the internal 1.23V comparator threshold, allowing independent resistor-divider programming - for example, detecting <3.0V (RST IN) and >4.2V (OVRST IN) on a 3.3V supply.