General Description

The MAX975/MAX977 single/dual comparators feature three different operating modes, and are optimized for +3V and +5V single-supply applications. The operating modes are as follows: high speed, high speed with auto-standby, and low power. Propagation delay is 28ns in high-speed mode, while supply current is only 250µA. Supply current is reduced to 3µA in low-power mode.

The auto-standby feature allows the comparator to automatically change from low-power mode to high speed mode upon receipt of an input signal. In the absence of an input signal, the comparator reverts back to low-power mode after an adjustable timeout period. The timeout period for the MAX975 to enter standby is set by a single capacitor. The dual MAX977 features independently adjustable timeout periods for each comparator using separate capacitors.

Features

♦ Three Operating Modes:

   High Speed

   High Speed with Auto-Standby

   Low Power

♦ 28ns Propagation Delay (high-speed mode)

♦ 5µA Max Supply Current in Low-Power/Auto-Standby Modes

♦ +3V/+5V Single-Supply Operation

♦ Rail-to-Rail Outputs

♦ Ground-Sensing Input

♦ Internal Hysteresis (high-speed mode)

♦ Adjustable Timeout Period

♦ µMAX Package (MAX975) QSOP-16 Package (MAX977)

Applications

    Battery-Powered Systems

    RF ID Tags

    Keyless Entry

    Threshold Detectors/Discriminators

    3V Systems

    IR Receivers

    Digital-Line Receivers