Analog Devices Inc./Maxim Integrated MAX6334UR17D3

Overview

MAX6334UR17D3 from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor reset supervisor IC designed for 1.8V–3.3V digital systems. It asserts an active-low RESET signal when VCC falls below 1.70V (±1.8% at +25°C), maintains reset for ≥100ms after VCC recovers, draws only 3.3µA at 2.5V, and operates down to VCC = 1.0V over –40°C to +125°C - enabling reliable power monitoring in battery-powered controllers and portable instrumentation.

For engineers reviewing the MAX6334UR17D3 datasheet, MAX6334UR17D3 pinout, MAX6334UR17D3 application, or MAX6334UR17D3 equivalent, this page delivers verified electrical specs, SOT23-3 terminal mapping, factory-trimmed threshold validation, open-drain interface guidance, and direct alternatives for critical μP reset design in space-constrained embedded systems.

Technical Context

The MAX6334UR17D3 implements a precision bandgap-based voltage comparator with factory-trimmed 1.70V reset threshold (±3% over full temperature range) and built-in hysteresis to reject fast VCC transients up to 24µs at 10V/ms slew rate. Its internal timeout circuit generates a guaranteed minimum 100ms reset pulse width independent of external components.

This device uses an open-drain output stage requiring an external pull-up resistor, enabling bidirectional reset arbitration with microcontrollers like the Motorola 68HC11 and compatibility with mixed-voltage I/O domains. It guarantees valid RESET assertion only down to VCC = 1.0V - unlike push/pull variants which operate to 0.7V.

Key Specifications

Pinout & Package

SOT23-3 package with gull-wing leads, JEDEC MO-178AC compliant, 1.3mm pitch, 0.95mm height, and RoHS-compliant lead-free finish (suffix +T) or Pb-based (suffix -T).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6334UR17D3, MAX6327UT23D3-T offers lower minimum VCC (0.7V) but lacks bus-sharing capability, while TPS3123E18DBVR provides superior threshold accuracy and broader supply range at the expense of higher quiescent current (12µA) and larger footprint.

Availability

MAX6334UR17D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6334UR17D3 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, automotive, communications, and computing markets.

The MAX633x family delivers ultra-low-power, factory-trimmed reset supervision for space-constrained embedded systems - targeting applications where supply stability, long battery life, and minimal external components are critical.

FAQ

What is the exact reset threshold voltage of MAX6334UR17D3 and how does it vary with temperature?

The MAX6334UR17D3 has a factory-trimmed nominal reset threshold of 1.70V at +25°C, with ±1.8% initial accuracy. Over the full operating temperature range of –40°C to +125°C, the threshold varies by ±3% (1.65V to 1.75V), as specified in the Electrical Characteristics table. This tight tolerance ensures consistent brownout detection across automotive and industrial environments without external calibration.

Does MAX6334UR17D3 require an external pull-up resistor, and what value is recommended?

Yes, MAX6334UR17D3 features an open-drain RESET output and requires an external pull-up resistor. A value between 10kΩ and 100kΩ is recommended - 47kΩ is commonly used - connected between the RESET pin and the target logic rail (e.g., 3.3V or 1.8V). This ensures proper logic-level translation and avoids excessive current draw while maintaining fast rise times during reset release.

Can MAX6334UR17D3 operate reliably below 1.0V VCC, and what happens to RESET output below that voltage?

No, MAX6334UR17D3 is only guaranteed to maintain valid RESET output down to VCC = 1.0V. Below this voltage, the internal circuitry cannot sustain correct comparator or output stage biasing. As VCC drops further, the open-drain output transitions to high-impedance state and relies entirely on the external pull-up resistor - meaning RESET will float high and cease asserting active-low reset, which aligns with its specified operational limit.

How does the 100ms reset timeout of MAX6334UR17D3 compare to other standard versions in the MAX633x family?

The "D3" suffix in MAX6334UR17D3 denotes a factory-programmed minimum reset timeout of 100ms. Other standard versions include D1 (1ms min) and D2 (20ms min). All timeouts are internally generated with ±50% variation over temperature, and no external components are needed - making MAX6334UR17D3 ideal for applications requiring extended processor initialization, such as flash memory programming or peripheral configuration sequences.

Is MAX6334UR17D3 pin-compatible with legacy Maxim reset supervisors like MAX809 or MAX6326?

Yes, MAX6334UR17D3 is pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the SOT23-3 package. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC - identical layout and footprint. However, users must verify reset threshold (1.70V vs. 2.93V for MAX809) and timeout (100ms vs. 140ms for MAX809) match system requirements before drop-in replacement.