Features and Benefits

  • 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)

Product Details

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 highspeed 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.

The MAX975/MAX977's inputs have a common-mode voltage range of -0.2V to (VCC - 1.2V). The differential input voltage range extends rail to rail. The outputs are capable of rail-to-rail operation without external pull-up circuitry, making these devices ideal for interface with CMOS/TTL logic. All inputs and outputs can tolerate a continuous short-circuit fault condition to either rail. The comparator's internal hysteresis in high-speed mode ensures clean output switching, even with slow-moving input signals.

The single MAX975 is available in 8-pin SO and 8-pin µMAX® packages, while the dual MAX977 is available in 14-pin SO and 16-pin QSOP packages.


  • 3V Systems
  • Battery-Powered Applications
  • Digital-Line Receivers
  • IR Receivers
  • Keyless Entry
  • RF ID Tags
  • Threshold Detectors/Discriminators

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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