Analog Devices Inc./Maxim Integrated MAX6736XKTWD7

Overview

The MAX6736XKTWD7 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 3.075V, VTH2 = 2.313V), open-drain active-low RESET output, manual reset input (MR), and 1200ms minimum reset timeout period. It monitors primary I/O supply (VCC1) and secondary core supply (VCC2) in portable battery-powered systems requiring precise power sequencing and low quiescent current.

For engineers reviewing the MAX6736XKTWD7 datasheet, MAX6736XKTWD7 pinout, MAX6736XKTWD7 application, or MAX6736XKTWD7 equivalent, this device serves as a space-constrained, ultra-low-power (6µA) supervisory solution for dual-rail systems where guaranteed reset assertion during brownout, accurate threshold tracking over temperature, and MR-initiated system recovery are critical design requirements.

Technical Context

The MAX6736XKTWD7 implements independent voltage comparators for VCC1 and VCC2, each referenced to precision internal bandgap-derived thresholds. Its reset logic asserts RESET low when either supply falls below its trimmed threshold and holds it low for ≥1200ms after both supplies recover - with timer restart on any subsequent undervoltage event.

It features an internal 1.5kΩ pullup on MR, supports CMOS-logic-level manual reset triggering, and guarantees valid RESET state down to VCC1 = 1.2V. The open-drain RESET output requires an external pullup and is compatible with bidirectional µP reset pins via series resistor isolation.

Key Specifications

Pinout & Package

MAX6736XKTWD7 is housed in a 5-pin SC70 package (1.6mm × 1.6mm × 0.9mm height), optimized for high-density portable designs. Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is VCC2 (secondary supply input), and Pin 5 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6316HUT46D3-T and TPS3808G125DBVR, the MAX6736XKTWD7 uniquely delivers factory-trimmed dual-threshold monitoring, 1200ms timeout, and 6µA ICC in SC70 - making it optimal for space-constrained, battery-sensitive dual-rail applications where accuracy and long hold time are non-negotiable.

Availability

MAX6736XKTWD7 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for MAX6736XKTWD7 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, sensing, and connectivity applications.

The MAX6736–MAX6745 product line delivers ultra-low-power, space-efficient microprocessor supervisors targeting portable, battery-operated, and multivoltage embedded systems where reliability and minimal footprint are essential.

FAQ

What is the exact reset timeout period of the MAX6736XKTWD7?

The MAX6736XKTWD7 has a guaranteed minimum reset timeout period of 1200ms after all monitored supplies (VCC1 and VCC2) rise above their respective thresholds. This value is confirmed in the Electrical Characteristics table under "VCC Reset Timeout Period (tRP)" for suffix D7, with typical values ranging from 1200ms to 2400ms across temperature and process variation. The MAX6736XKTWD7 uses this extended timeout to ensure robust µP initialization in complex embedded systems.

Does the MAX6736XKTWD7 support manual reset functionality?

Yes, the MAX6736XKTWD7 includes a dedicated active-low manual reset (MR) input on Pin 3. Pulling MR low for ≥1µs forces RESET low immediately, and RESET remains asserted for the full 1200ms timeout period after MR returns high. An internal 1.5kΩ pullup to VCC1 eliminates the need for an external resistor, enabling direct connection to a momentary switch. This behavior is fully specified in the Electrical Characteristics section for MAX6736XKTWD7.

What are the factory-trimmed voltage thresholds for the MAX6736XKTWD7?

The MAX6736XKTWD7 has two factory-trimmed reset thresholds: VTH1 = 3.075V for VCC1 (I/O supply) and VTH2 = 2.313V for VCC2 (core supply). These values are defined by the "TW" suffix in the part number and are guaranteed over -40°C to +85°C with ±75mV tolerance. They are listed in Table 1 of the datasheet under "Reset Voltage Threshold Suffix Guide" and apply exclusively to the MAX6736XKTWD7 variant.

Is the RESET output of the MAX6736XKTWD7 push-pull or open-drain?

The RESET output of the MAX6736XKTWD7 is open-drain active-low, as confirmed in the Selector Guide and Pin Description table. It requires an external pullup resistor to VCC1 or another logic rail. This configuration supports wired-OR reset buses, level translation, and compatibility with bidirectional µP reset pins - unlike push-pull variants (e.g., MAX6737). The MAX6736XKTWD7's open-drain architecture is explicitly documented in its functional diagram and pin function description.

What package type and dimensions does the MAX6736XKTWD7 use?

The MAX6736XKTWD7 is packaged in a 5-pin SC70 (also labeled SC70-5), measuring 1.6mm × 1.6mm × 0.9mm. This ultra-small outline package is specified in the Ordering Information section and Pin Configurations diagram. Its compact size provides significant board-area savings over alternatives like SOT23-5, making the MAX6736XKTWD7 ideal for space-constrained portable and wearable electronics designs.