Analog Devices Inc./Maxim Integrated MAX6700UT-T

Overview

MAX6700UT-T from Maxim Integrated is a precision triple-voltage microprocessor supervisory circuit in a 6-pin SOT23 package, monitoring three adjustable supply voltages down to 0.62V with ±1.5% threshold accuracy, 35μA quiescent current, and 5μs propagation delay - used for reliable power-on reset and brownout detection in compact embedded systems.

For engineers reviewing the MAX6700UT-T datasheet, MAX6700UT-T pinout, MAX6700UT-T application, or MAX6700UT-T equivalent, this device serves as a low-power, high-accuracy voltage detector for multi-rail systems where fast response, minimal external components, and guaranteed operation from -40°C to +85°C are critical selection criteria.

Technical Context

The MAX6700UT-T implements three independent adjustable voltage monitors using an internal 0.62V bandgap reference and precision comparators with 0.3% hysteresis, enabling accurate undervoltage detection across diverse rail combinations without factory-trimmed thresholds. Its open-drain RESET output features a 10μA internal pullup to IN2 (or VCC for Q variants), eliminating need for external pullups in many logic interfaces.

Unlike the MAX6710 series, the MAX6700UT-T functions strictly as a voltage detector - asserting RESET low when any input falls below its threshold and deasserting it after a fixed 5μs propagation delay once all inputs exceed thresholds. RESET remains valid as long as IN2 ≥ 1.0V or VCC ≥ 2.0V, supporting robust operation during partial power-up sequences.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6 (U6+1 outline), footprint-compatible with industry-standard 6-lead SOT packages, RoHS-compliant (lead-free version denoted by "+T" suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6710AUT-T, the MAX6700UT-T offers faster 5μs release and full adjustability across all three rails but lacks factory-set thresholds; compared with TPS3808G125DBVR, it provides triple monitoring at higher quiescent current but enables coordinated reset across heterogeneous supply domains.

Availability

MAX6700UT-T is available at Aetrix Electronics and suitable for industrial PLC controllers, network edge routers, medical handheld diagnostics, and automotive infotainment gateways requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX6700UT-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 precision analog and mixed-signal ICs for power management, sensing, and interface applications, with emphasis on high-reliability, low-power, and miniaturized solutions.

The MAX6700UT-T belongs to Maxim's μP supervisory product line, engineered specifically for compact, multi-rail embedded systems needing accurate, low-current voltage monitoring and deterministic reset behavior without external timing components.

FAQ

What is the exact function of the MAX6700UT-T in a power sequencing system?

The MAX6700UT-T acts as a triple-voltage detector that asserts its active-low RESET output whenever any of its three adjustable inputs (IN1, IN3, IN4) drops below its threshold - typically set via external resistor dividers referencing the internal 0.62V bandgap. It releases RESET 5μs after all monitored voltages exceed their thresholds, enabling precise coordination with processor boot timing. The MAX6700UT-T does not provide programmable delay or manual reset; its role is strictly voltage-level detection and fast-response reset generation.

Can the MAX6700UT-T monitor a 5.0V supply directly, or does it require external components?

The MAX6700UT-T cannot monitor a 5.0V supply directly because its adjustable inputs are referenced to an internal 0.62V threshold. To monitor 5.0V, an external resistor divider must be used: for example, R1 = 6.1kΩ and R2 = 820Ω yields V_TH ≈ 5.0V at the input pin. The MAX6700UT-T's ±0.2μA input bias on IN3/IN4 (±0.4μA on IN1) allows use of high-value resistors (≤100kΩ for R2) with <1% error. Factory-trimmed 5.0V options exist only in MAX6710 variants, not in the MAX6700UT-T.

What is the minimum valid supply voltage for the MAX6700UT-T to maintain functional RESET output?

The MAX6700UT-T requires either IN2 ≥ 1.0V or VCC ≥ 2.0V to ensure valid RESET output state. Since the MAX6700UT-T uses IN2 as its power source (not VCC - that applies only to MAX6700/MAX6710Q variants), functional operation is guaranteed as long as IN2 remains ≥ 1.0V. Below 1.0V, RESET behavior is undefined. This design allows the MAX6700UT-T to remain active and assert RESET even during partial power-down sequences where IN2 stays above 1.0V while other rails collapse.

How does the MAX6700UT-T handle noise on monitored supply lines?

The MAX6700UT-T incorporates 0.3% built-in threshold hysteresis and is specified to reject short transients: it ignores glitches ≤ 100μs duration when overdrive is ≤ 100mV. No external RC filtering is required for typical digital supply noise. For high-noise environments (e.g., motor drives or switching regulators), adding a 100pF–1nF capacitor from IN1/IN3/IN4 to GND improves immunity without affecting response time. The internal bandgap reference and comparator architecture ensure stable operation across -40°C to +85°C without calibration.

Is the MAX6700UT-T pin-compatible with any MAX6710 variants?

No, the MAX6700UT-T is not pin-compatible with MAX6710 variants despite sharing the same SOT23-6 package and pin numbering. While both use pins 1–4 for inputs, 5 for GND, and 6 for RESET, the functional assignment differs: MAX6710 variants monitor IN2 as a supply *and* a voltage rail, whereas MAX6700UT-T uses IN2 solely as power with no monitoring. Additionally, MAX6710 devices include internal timeout circuitry absent in MAX6700UT-T, making direct substitution electrically invalid without schematic and firmware review.