Micropower, Low-Voltage, UCSP/SC70, Rail-to-Rail I/O Comparators

 

Part Number	Replacement	Explanation

Description

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The MAX985/MAX986/MAX989/MAX990/MAX993/MAX994 single/dual/quad micropower comparators feature low-voltage operation and rail-to-rail inputs and outputs. Their operating voltages range from 2.5V to 5.5V, making them ideal for both 3V and 5V systems. These comparators also operate with ±1.25V to ±2.75V dual supplies. They consume only 11µA of supply current while achieving a 300ns propagation delay.

Input bias current is typically 1.0pA, and input offset voltage is typically 0.5mV. Internal hysteresis ensures clean output switching, even with slow-moving input signals.

The output stage's unique design limits supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. The MAX985/MAX989/MAX993 have a push-pull output stage that sinks as well as sources current. Large internal output drivers allow rail-to-rail output swing with loads up to 8mA. The MAX986/MAX990/MAX994 have an open-drain output stage that can be pulled beyond V_CC to 6V (max) above V_EE. These open-drain versions are ideal for level translators and bipolar to single-ended converters.

The single MAX985 is available in a chip-scale package (UCSP™), significantly reducing the required PC board area. The single MAX985/MAX986 are available in 5-pin SC70 packages and the dual MAX989/MAX990 are available in 8-pin SOT23 packages.

MAX985, MAX986, MAX989, MAX990, MAX993, MAX994: Typical Operating Circuit Enlarge+

Key Features

• 11µA Quiescent Supply Current
• 2.5V to 5.5V Single-Supply Operation
• Common-Mode Input Voltage Range Extends 250mV Beyond the Rails
• 300ns Propagation Delay
• Push-Pull Output Stage Sinks and Sources 8mA Current (MAX985/MAX989/MAX993)
• Open-Drain Output Voltage Extends Beyond V_CC (MAX986/MAX990/MAX994)
• Unique Output Stage Reduces Output Switching Current, Minimizing Overall Power Consumption
• 80µA Supply Current at 1MHz Switching Frequency
• No Phase Reversal for Overdriven Inputs
• Available in Space-Saving Packages:
  • UCSP (MAX985)
  • SOT23 (MAX985/MAX986/MAX989/MAX990)
  • µMAX® (MAX989/MAX990)

Applications/Uses

• Digital-Line Receivers
• Ground/Supply Sensing
• IR Receivers
• Level Translators
• Mobile Communications
• Portable Battery-Powered Systems
• Threshold Detectors
• Window Comparators
• Zero-Crossing Detectors