Analog Devices Inc./Maxim Integrated MAX9645EBS+TG45

Overview

MAX9645EBS+TG45 from Maxim Integrated is a nanoPower inverting comparator with internal 0.2V precision reference, open-drain output, and 4-bump UCSP (1mm × 1mm) package. It operates from 1.0V to 5.5V supply, draws ≤700nA supply current, features -0.3V to +5.5V input voltage range independent of VCC, and delivers 15µs propagation delay across -40°C to +85°C - ideal for low-voltage battery-powered sensing in space-constrained portable electronics.

For engineers reviewing the MAX9645EBS+TG45 datasheet, MAX9645EBS+TG45 pinout, MAX9645EBS+TG45 application, or MAX9645EBS+TG45 equivalent, key selection criteria include its inverting input topology, ultra-low ICC at sub-1V operation, guaranteed 1% reference accuracy over temperature, RF-immune input stage, and compatibility with microcontroller GPIOs requiring external pullup.

Technical Context

The MAX9645EBS+TG45 implements an inverting-input comparator architecture with internal 0.2V trimmed reference (±1% at +25°C, ±3.5% over -40°C to +85°C) and on-chip filtering for RF immunity. Its input stage maintains high impedance even when VCC = 0V, enabling robust power-gating schemes in battery-operated systems.

It uses open-drain output requiring external pullup, supports rail-to-rail input beyond VCC (up to +6V), and achieves 15µs propagation delay with ±100mV overdrive. Power-up time is 3ms, and PSRR is 40–53dB across 1.0V–5.5V supply range.

Key Specifications

Pinout & Package

MAX9645EBS+TG45 uses a 4-bump UCSP package (bumps on bottom, top-mark +AGM), with 0.4mm bump pitch and RoHS-compliant G45 protective die coating. The package is not leaded; connections are made via solder bumps aligned to PCB pads per land pattern AN1891.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9644EBS+TG45 and TLV3691IDCKR, the MAX9645EBS+TG45 uniquely combines inverting topology, guaranteed 1.0V operation, and ±1% reference accuracy - making it the sole option for low-voltage, active-low threshold detection in space-constrained industrial and medical wearables.

Availability

MAX9645EBS+TG45 is available at Aetrix Electronics and suitable for cell phone battery monitoring, portable medical glucose sensors, notebook power sequencing, electronic toy low-voltage detection, and portable media player power management requiring stable component supply and long-term lifecycle support.

Supply support for MAX9645EBS+TG45 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, medical, and consumer applications.

The MAX964x family delivers nanoPower comparators with integrated references specifically for battery-critical, space-constrained portable electronics - prioritizing sub-1V operation, ultra-low ICC, and miniature UCSP packaging.

FAQ

What is the input configuration of MAX9645EBS+TG45?

The MAX9645EBS+TG45 features an inverting input configuration: the output goes low when the voltage applied to the IN pin exceeds the internal 200mV reference, and goes high (via external pullup) when IN falls below that threshold. This behavior is confirmed in the device's Pin Description table and Applications Information section, and distinguishes it from the noninverting MAX9644EBS+TG45 and push-pull MAX9646EBS+TG45 variants. The MAX9645EBS+TG45's inverting action makes it ideal for active-low fault signaling.

Does MAX9645EBS+TG45 require an external pullup resistor?

Yes, MAX9645EBS+TG45 requires an external pullup resistor on the OUT pin because it features an open-drain output stage. The datasheet specifies this explicitly in the Pin Description and Output Stage Structure sections. Without a pullup, the output cannot assert a logic high state. Typical values range from 10kΩ to 100kΩ depending on speed and drive requirements; the MAX9645EBS+TG45's 15µs propagation delay remains valid with standard pullup values used in portable electronics.

What is the guaranteed reference voltage accuracy of MAX9645EBS+TG45 over temperature?

The MAX9645EBS+TG45 guarantees ±3.5% reference voltage accuracy over the full -40°C to +85°C operating temperature range, with tighter ±1% accuracy at +25°C. This is documented in the Electrical Characteristics table under "Input Threshold Error" and confirmed in Note 4. The 200mV nominal reference is trimmed at production and stabilized by on-chip temperature compensation, delivering predictable trip points in battery-powered devices exposed to ambient thermal variation.

Can MAX9645EBS+TG45 operate with supply voltages below 1.2V?

Yes, MAX9645EBS+TG45 is fully specified to operate down to VCC = 1.0V, with supply current tested at 1.0V (0.4–0.7µA typical/max) and output performance characterized at 1.0V (VOL ≤ 0.2V at 50µA sink). This capability is critical for compatibility with next-generation ultra-low-voltage microcontrollers and energy-harvesting systems. The datasheet confirms operation from 1.0V to 5.5V in both Absolute Maximum Ratings and DC Characteristics tables.

Is the UCSP package of MAX9645EBS+TG45 RoHS-compliant and what does 'G45' signify?

Yes, the MAX9645EBS+TG45 UCSP package is RoHS-compliant, indicated by the "+" suffix per Maxim's packaging nomenclature. The "G45" denotes protective die coating - a conformal layer enhancing moisture and mechanical robustness for reliability in portable and wearable applications. This is explicitly defined in the Ordering Information table and Package Information section, and aligns with the "+G45" marking on the top of the device (+AGM).