Analog Devices Inc./Maxim Integrated MAX6804US30D3+T

Overview

MAX6804US30D3+T from Maxim Integrated is a 4-pin SOT143 ultra-low-power microprocessor supervisory circuit with active-low push/pull RESET output, 3.00V factory-trimmed reset threshold (±3% over temperature), and 100ms minimum reset timeout period. It monitors VCC in 2.85V–5.0V digital systems, asserts reset during brownout or manual reset, and guarantees valid RESET down to VCC = 0.7V. Used in portable equipment, controllers, and critical µP power monitoring.

For engineers reviewing the MAX6804US30D3+T datasheet, MAX6804US30D3+T pinout, MAX6804US30D3+T application, or MAX6804US30D3+T equivalent, key selection criteria include guaranteed 0.7V operation, 4.0µA supply current at 3.0V, 100ms reset timeout stability over –40°C to +125°C, and compatibility with bidirectional µP reset pins via push/pull drive strength.

Technical Context

The MAX6804US30D3+T implements a precision bandgap-based reset comparator with factory-trimmed 3.00V threshold (±1.8% at +25°C, ±3% over –40°C to +125°C) and immunity to VCC transients ≤30µs at 10V/ms slew rate. Its internal 20kΩ MR pullup eliminates external components for manual reset.

Reset assertion is synchronized to VCC falling edge with 30µs propagation delay, and deassertion follows a monotonic 100ms–200ms timeout window after VCC rises above threshold or MR release. The push/pull RESET output sources ≥0.8×VCC at 500µA and sinks ≤0.4V at 3.2mA (VCC ≥ 4.25V), enabling direct interface to CMOS inputs without external pullups.

Key Specifications

Pinout & Package

MAX6804US30D3+T is housed in a RoHS-compliant 4-pin SOT143 package (U4-1 outline, 90-0183 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6804US30D3+T, MAX6314US30D3+T offers automotive qualification at slight ICC penalty, while TPS3808G30DBVR trades push/pull simplicity for lower current but adds external component overhead and fixed 200ms timeout - neither is pin-compatible nor drop-in.

Availability

MAX6804US30D3+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6804US30D3+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 high-performance analog, mixed-signal, and power-management ICs for industrial, computing, communications, and consumer applications.

The MAX680x family delivers compact, low-power µP supervisory circuits targeting space- and power-constrained embedded systems where precise brownout detection and guaranteed reset timing are critical.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6804US30D3+T?

The MAX6804US30D3+T has a factory-trimmed reset threshold of 3.00V, specified as ±1.8% at +25°C and ±3% over the full operating temperature range of –40°C to +125°C. This value is confirmed in Table 1 of the datasheet under suffix "30", and applies directly to the MAX6804US30D3+T without user adjustment or external components.

Does MAX6804US30D3+T support operation below 1.0V, and what happens to RESET output at low VCC?

Yes, MAX6804US30D3+T is guaranteed to maintain valid RESET assertion down to VCC = 0.7V. As VCC falls below 1.0V, the push/pull output retains defined logic states: RESET remains actively driven low during brownout, ensuring downstream µP stays held in reset even during deep supply collapse - a key reliability feature confirmed in the Electrical Characteristics table and Applications Information section.

What is the reset timeout period for MAX6804US30D3+T, and how is it implemented?

The MAX6804US30D3+T features a 100ms minimum reset timeout period (150ms typical, 200ms maximum), factory-programmed via the "D3" suffix. This timeout begins after VCC rises above 3.00V or after the MR input is released, and is generated by an internal RC oscillator - eliminating need for external timing capacitors while maintaining monotonic behavior across temperature and voltage.

How does the manual-reset (MR) input function on MAX6804US30D3+T, and is external circuitry required?

The MR input on MAX6804US30D3+T has an internal 20kΩ pullup resistor, so it may be left floating if unused. A logic-low pulse ≥1µs on MR asserts RESET immediately and holds it for the full 100ms+ timeout after MR returns high. No external debounce components are needed - the internal circuit rejects glitches <50ns and provides clean reset initiation, as verified in the Electrical Characteristics and Applications Information sections.

Is MAX6804US30D3+T pin-compatible with other supervisory ICs such as MAX811 or MAX6314?

MAX6804US30D3+T shares the same 4-pin SOT143 pinout and pin functions (GND, RESET, MR, VCC) with MAX811/MAX812 and MAX6314/MAX6315 families, as explicitly stated in the datasheet's Features section. However, electrical differences - including reset threshold accuracy, timeout period, and supply current - require verification against target system requirements; it is not a blind drop-in replacement without design review.