Analog Devices Inc./Maxim Integrated MAX6803US46D1

Overview

MAX6803US46D1 from Maxim Integrated is a 4-pin SOT143 push/pull active-high microprocessor supervisory circuit designed for precise power supply monitoring in embedded systems. It asserts a high-level RESET signal when VCC drops below 4.63V (±3% over temperature) or upon manual reset, with a guaranteed minimum 1ms timeout period and ultra-low 4µA supply current at 3V. It operates down to 0.7V and supports critical µP power monitoring in portable, industrial, and automotive-qualified applications.

For engineers reviewing the MAX6803US46D1 datasheet, MAX6803US46D1 pinout, MAX6803US46D1 application, or MAX6803US46D1 equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold, 1ms minimum reset timeout, active-high push/pull output, -40°C to +125°C operation, and compatibility with space-constrained designs requiring reliable brownout detection without external components.

Technical Context

The MAX6803US46D1 implements a precision bandgap-based voltage comparator with factory-trimmed 4.63V threshold (±1.8% at +25°C, ±3% over full temperature range) and built-in immunity to fast VCC transients (e.g., ≤30µs at 10V/ms). Its internal 20kΩ MR pullup enables direct connection of a momentary switch to GND without external debounce circuitry.

Reset assertion is synchronized to both VCC falling edge and MR logic low, with a fixed 1ms minimum timeout after VCC recovery or MR release. The push/pull output drives high with VOH ≥ 0.8×VCC (ISOURCE = 800µA at VCC ≥ 4.25V) and sinks low with VOL ≤ 0.4V (ISINK = 3.2mA at VCC ≥ 5.0V), ensuring robust interfacing with CMOS µP reset inputs.

Key Specifications

Pinout & Package

MAX6803US46D1 is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052 land pattern), optimized for space-constrained PCB layouts with 1.3mm × 1.3mm footprint and 0.95mm height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MAX811TEUS46D3-T and TLV803EB29DPWR, the MAX6803US46D1 uniquely combines 4.63V precision threshold, 1ms timeout, -40°C to +125°C operation, MR input, and active-high push/pull output in a single 4-pin SOT143 device-making it the only option meeting full industrial and automotive reset supervision requirements without design compromises.

Availability

MAX6803US46D1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6803US46D1 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, automotive, communications, and computing markets with emphasis on reliability and integration.

The MAX6803 series targets space- and power-constrained microprocessor supervisory applications, delivering factory-trimmed voltage monitoring, manual reset, and guaranteed reset validity down to 0.7V in minimal footprint.

FAQ

What is the exact reset threshold voltage of the MAX6803US46D1 and how stable is it over temperature?

The MAX6803US46D1 has a factory-trimmed reset threshold of 4.63V at +25°C, with guaranteed tolerance of ±1.8% at room temperature and ±3% over the full -40°C to +125°C operating range. This stability ensures consistent brownout detection across automotive and industrial environments without requiring recalibration or external compensation networks.

Does the MAX6803US46D1 require external components to function as a complete reset supervisor?

No, the MAX6803US46D1 requires zero external components: its 20kΩ internal MR pullup resistor eliminates the need for an external pullup, the push/pull active-high RESET output drives µP reset pins directly without a pullup resistor, and the precision voltage reference is fully integrated. Only VCC, GND, MR (optional), and RESET connections are needed.

How does the MAX6803US46D1 handle fast transients on the VCC supply line?

The MAX6803US46D1's reset comparator is specifically designed to reject fast VCC transients, with a specified 30µs propagation delay for 10V/ms falling edges. Its internal architecture ignores spikes shorter than ~50ns and tolerates larger-amplitude glitches only if their duration remains below values shown in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph in the datasheet.

Can the MAX6803US46D1 assert a valid reset signal when VCC drops below 1.0V?

Yes-the MAX6803US46D1 is guaranteed to maintain correct RESET output state down to VCC = 0.7V. When VCC falls below 0.7V, the push/pull output enters high-impedance mode; however, a 100kΩ external pullup resistor between RESET and VCC (as recommended in Figure 2b of the datasheet) ensures RESET remains high and valid even as VCC approaches 0V.

What is the meaning of the "D1" suffix in MAX6803US46D1 and how does it affect timing behavior?

The "D1" suffix in MAX6803US46D1 indicates a factory-programmed minimum reset timeout period of 1ms. This value is laser-trimmed during manufacturing and remains stable over temperature and voltage; the actual timeout is 1ms (min), 1.5ms (typ), and 2ms (max) across -40°C to +125°C, ensuring compliance with µP power-on reset timing specifications.