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, asserting reset if either falls below its threshold and holding it for ≥1200ms after recovery. Designed for space-constrained multivoltage applications like notebook computers and GPS equipment.

For engineers reviewing the MAX6736XKTWD7+ datasheet, MAX6736XKTWD7+ pinout, MAX6736XKTWD7+ application, or MAX6736XKTWD7+ equivalent, key selection criteria include its SC70-5 package footprint, 6µA quiescent current, dual fixed-threshold supervision with no adjustable inputs, and compatibility with bidirectional µP reset interfaces via external pullup.

Technical Context

The MAX6736XKTWD7+ implements independent voltage monitoring on VCC1 and VCC2 using precision bandgap references, with reset assertion triggered when either supply drops below its factory-set threshold (3.075V/2.313V). Its internal timer guarantees a minimum 1200ms reset pulse width after all monitored supplies recover, preventing premature µP release during brownout recovery.

It features an open-drain RESET output requiring an external pullup resistor, a dedicated active-low MR input with 1.5kΩ internal pullup to VCC1, and operates across the full industrial temperature range (–40°C to +85°C) with supply voltage support from 1.0V to 5.5V on both VCC1 and VCC2 rails.

Key Specifications

Pinout & Package

MAX6736XKTWD7+ uses the 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is MR (manual reset input), 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 MAX6736XKTWD3+, the MAX6736XKTWD7+ provides 8× longer reset hold time for robust brownout recovery; compared with TPS3808G33DBVR, it integrates dual-rail supervision in half the footprint without external components, reducing BOM count and layout complexity.

Availability

MAX6736XKTWD7+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, notebook computers, and GPS equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6736–MAX6745 family was designed specifically for low-power dual- and triple-voltage microprocessor supervision in space-constrained portable electronics, emphasizing ultra-low quiescent current and factory-trimmed accuracy.

FAQ

What is the 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" for suffix D7, and applies across the full –40°C to +85°C operating temperature range. The MAX6736XKTWD7+ uses this extended timeout to ensure reliable µP initialization in systems with slow power-supply recovery.

Does the MAX6736XKTWD7+ support adjustable reset thresholds?

No, the MAX6736XKTWD7+ does not support adjustable reset thresholds. It is a dual fixed-threshold variant: VTH1 = 3.075V for VCC1 and VTH2 = 2.313V for VCC2, as defined by the "TW" suffix per Table 1. Unlike MAX6738/MAX6739 variants, it lacks an RSTIN pin and cannot monitor a third or user-defined voltage. All threshold values are factory-trimmed and non-configurable.

What package type and pin count does the MAX6736XKTWD7+ use?

The MAX6736XKTWD7+ uses a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), as specified in the Ordering Information section and confirmed in the Pin Configurations diagram. Pinout is standardized across the MAX6736–MAX6739 series: Pin 1 = RESET (open-drain), Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1.

Can the MAX6736XKTWD7+ be used with bidirectional µP reset pins?

Yes, the MAX6736XKTWD7+ can interface directly with bidirectional µP reset pins because its RESET output is open-drain active-low. As documented in the Applications Information section, this allows safe connection without logic contention-simply add a 4.7kΩ pullup resistor between RESET and the µP's reset I/O port, as shown in Figure 5 of the datasheet. No level-shifting or additional buffering is required.

What is the supply current consumption of the MAX6736XKTWD7+?

The MAX6736XKTWD7+ draws 6µA typical supply current (ICC1) when VCC1 = 3.3V and no reset is asserted, as measured at TA = +25°C. This ultra-low quiescent current is maintained across the full operating temperature range and enables multi-year battery life in always-on portable devices. Total current includes contributions from both VCC1 and VCC2 paths, with ICC2 adding ≤2µA under typical conditions.