Analog Devices Inc./Maxim Integrated MAX6306UK30D3+

Overview

The MAX6306UK30D3+ from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC for undervoltage conditions and provides a push/pull active-low reset output. It features a factory-trimmed 3.0V ±2.5% reset threshold, 140ms (min) reset timeout period, manual-reset input (MR), and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset assertion.

For engineers reviewing the MAX6306UK30D3+ datasheet, MAX6306UK30D3+ pinout, MAX6306UK30D3+ application, or MAX6306UK30D3+ equivalent, key selection considerations include its 3.0V VCC reset threshold tolerance, MR input compatibility with TTL/CMOS logic, immunity to fast VCC transients (<100ns), guaranteed operation over -40°C to +85°C, and lead-free SOT23-5 packaging.

Technical Context

The MAX6306UK30D3+ uses an internal factory-trimmed resistor divider to monitor VCC against a precision 1.23V reference, enabling accurate 3.0V threshold detection with ±2.5% variation over temperature. Its reset generator includes a programmable timeout timer (D3 = 140ms min) and asserts RESET low when VCC falls below threshold or when MR is pulled low.

This device integrates a 63.5kΩ internal pull-up on MR, supports undervoltage monitoring only on VCC (no external RST IN_ or OVRST IN inputs), and guarantees valid RESET output down to VCC = 1V with 0.3V VOL at ISINK = 500µA. It draws only 8µA typical supply current and ignores transients shorter than ~100ns at 3.0V threshold overdrive.

Key Specifications

Pinout & Package

MAX6306UK30D3+ is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (package code U5+1, outline 21-0057), optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK30D2+, the MAX6306UK30D3+ provides longer reset assertion for complex boot sequences; compared with TPS3808G30DBVR, it offers integrated MR but looser threshold tolerance-making it optimal for cost-sensitive, manually resettable 3.3V embedded systems.

Availability

MAX6306UK30D3+ is available at Aetrix Electronics and suitable for portable computers, intelligent instruments, and multivoltage embedded systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX6306UK30D3+ 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 in industrial, automotive, and communications markets.

The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, low-power systems-emphasizing factory-programmable thresholds, minimal external components, and robust transient immunity.

FAQ

What is the factory-programmed reset threshold voltage for MAX6306UK30D3+?

The MAX6306UK30D3+ has a factory-trimmed VCC reset threshold of 3.0V with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is laser-trimmed during production and corresponds to the "30" in the part number (UK30). It is designed to monitor 3.3V supply rails with appropriate margin and does not require external resistors or calibration.

Does MAX6306UK30D3+ support manual reset functionality?

Yes, MAX6306UK30D3+ includes a dedicated MR (manual-reset) input on pin 3. It features an internal 63.5kΩ pull-up resistor, so the pin can be left unconnected if unused. To assert reset, drive MR to ≤0.8V for ≥1.5µs. RESET remains active for the full 140ms timeout period after MR returns high, ensuring deterministic system restart.

What is the minimum VCC voltage required for MAX6306UK30D3+ to operate correctly?

MAX6306UK30D3+ requires VCC ≥ 3.075V to function reliably, calculated as VTH + 2.5% = 3.0V × 1.025. Below this, the internal voltage divider cannot guarantee accurate threshold comparison. The device guarantees RESET assertion down to VCC = 1V, but valid supervision begins only above 3.075V. Operation below this level may result in undefined reset behavior.

Is MAX6306UK30D3+ compatible with 3.3V and 5V logic systems?

Yes, MAX6306UK30D3+ is compatible with both 3.3V and 5V systems. Its MR input accepts TTL-logic levels in 5V systems (VIH ≥ 2.4V) and CMOS-logic levels in 3V systems (VIH ≥ 0.7×VCC). The push/pull RESET output drives low to ≤0.3V at 500µA sink current, making it interoperable with standard 3.3V and 5V µP reset inputs without level-shifting.

What package type and RoHS status does MAX6306UK30D3+ use?

MAX6306UK30D3+ is supplied in a lead-free, RoHS-compliant 5-pin SOT23 package (package code U5+1). The "+" suffix in the part number explicitly denotes lead-free construction. It uses standard SOT23-5 footprint (land pattern 90-0174) and is shipped in tape-and-reel format only, supporting high-volume automated PCB assembly.