Analog Devices Inc./Maxim Integrated MAX6335US23D3

Overview

MAX6335US23D3 from Maxim Integrated is an ultra-low-voltage, push/pull active-high microprocessor supervisory circuit in a 4-pin SOT143 package. It monitors 1.8V–3.3V power supplies, asserts RESET when VCC falls below 2.30V (±3% over temperature), and guarantees valid output down to VCC = 0.7V. It features a debounced manual-reset input, 100ms minimum reset timeout, and 3.3µA typical supply current-ideal for battery-powered instrumentation and critical µP power monitoring.

For engineers reviewing the MAX6335US23D3 datasheet, MAX6335US23D3 pinout, MAX6335US23D3 application, or MAX6335US23D3 equivalent, key selection factors include its active-high RESET output, factory-trimmed 2.30V threshold, guaranteed operation at 0.7V VCC, 100ms reset timeout, and compatibility with space-constrained embedded systems requiring deterministic reset behavior during brownout and manual recovery.

Technical Context

The MAX6335US23D3 implements a precision voltage comparator with factory-trimmed 2.30V reset threshold (±1.8% at +25°C, ±3% over –40°C to +125°C) and built-in hysteresis to reject fast VCC transients up to 24µs. Its internal reset timer generates a fixed 100ms minimum active period after VCC recovery or MR deassertion, independent of external components.

It integrates a 20kΩ internal MR pull-up resistor and operates with no external capacitors or resistors. The push/pull output drives high (≥0.8VCC at ISOURCE = 200µA) and low (≤0.3V at ISINK = 500µA), ensuring clean logic-level signaling into high-impedance µP reset inputs-even during deep undervoltage conditions down to 0.7V.

Key Specifications

Pinout & Package

MAX6335US23D3 is housed in a 4-pin SOT143 package (3.0mm × 1.6mm × 0.9mm), optimized for space-constrained PCB layouts. Pin 1 is VCC, Pin 2 is RESET (active-high push/pull), Pin 3 is MR (manual reset input), and Pin 4 is GND - top-marked "KABQ" per Maxim's Selector Guide.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TEUS23+T and TLV803EC23DBZR, the MAX6335US23D3 uniquely combines active-high push/pull output, integrated MR with debounce, and guaranteed 0.7V operation-making it optimal for new designs requiring deterministic reset assertion without external components or logic inversion.

Availability

MAX6335US23D3 is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive body electronics, and industrial PLCs requiring stable component supply, long-term lifecycle support, and guaranteed availability of standard SOT143 supervisory ICs.

Supply support for MAX6335US23D3 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.

The MAX6335 series belongs to Maxim's µP supervisory product line, engineered specifically for ultra-low-voltage, low-power reset monitoring in space- and energy-constrained embedded systems where reliability under brownout and manual recovery is non-negotiable.

FAQ

What is the exact reset threshold voltage of MAX6335US23D3, and how does it vary with temperature?

The MAX6335US23D3 has a factory-trimmed nominal reset threshold of 2.30V. At +25°C, this is specified as 2.26V to 2.34V (±1.8%). Over the full operating temperature range of –40°C to +125°C, the threshold shifts to 2.23V to 2.37V (±3%). This tight tolerance ensures consistent brownout detection across automotive and industrial thermal environments without external calibration.

Does MAX6335US23D3 require external components to function, and what is its quiescent current?

No, the MAX6335US23D3 requires zero external components: no timing capacitors, no threshold-setting resistors, and no pull-up/pull-down networks for RESET or MR. Its typical supply current is 3.3µA at VCC = 2.5V and 6.0µA at VCC = 1.8V across –40°C to +125°C-enabling multi-year operation on coin-cell batteries in always-on monitoring devices.

How does the manual reset (MR) input work on MAX6335US23D3, and is external debouncing needed?

The MR input on MAX6335US23D3 is internally debounced and features a 20kΩ pull-up to VCC. A logic-low pulse ≥160µs at VCC = 2.6V asserts RESET; the device holds RESET active for the full 100ms timeout after MR returns high. Because internal filtering rejects sub-microsecond noise, no external RC network or firmware debouncing is required-only a normally open switch between MR and GND is needed for field service reset.

Can MAX6335US23D3 operate reliably when VCC drops below 1.0V, and what happens to the RESET output?

Yes, the MAX6335US23D3 is fully specified down to VCC = 0.7V and guarantees valid RESET output behavior throughout that range. When VCC falls below 1.0V, the push/pull driver maintains strong logic-high assertion (≥0.8VCC) and low-impedance deassertion (≤0.3V). This ensures µP reset pins remain unambiguously controlled-even during catastrophic brownout-unlike open-drain alternatives that lose drive capability below 1.0V.

Is MAX6335US23D3 pin-compatible with other Maxim supervisory ICs, and which ones?

Yes, MAX6335US23D3 is pin-compatible with the MAX811/MAX812 and MAX6314/MAX6315 families in the same 4-pin SOT143 package. Pin 1 (VCC), Pin 2 (RESET), Pin 3 (MR), and Pin 4 (GND) match identically. However, output polarity differs: MAX6335US23D3 provides active-high RESET, whereas MAX811/MAX812 deliver active-low outputs-requiring schematic review before drop-in substitution.