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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