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Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby

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.

Key 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/Uses

  • 3V Systems
  • Battery-Powered Applications
  • Digital-Line Receivers
  • IR Receivers
  • Keyless Entry
  • RF ID Tags
  • Threshold Detectors/Discriminators
Parametric specs for Dual-Speed Comparators
tPD (ns) 28 (high speed)
480 (low speed)
ICC (µA) (max) 500/5
VOS (mV) (typ) 0.2
VOS (mV) (max) 2
Logic Out TTL/CMOS
Latched Outputs No
Complementary Outputs No
VSUPPLY (V) 2.7 to 5.25
# Comparators 1
VIN (V) VEE-0.20 to VCC-1.5
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$2.17 @1k
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Simplified Block Diagram

MAX975, MAX977: Pin Configuration MAX975, MAX977: Pin Configuration Zoom icon

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Parameters

Parametric specs for Dual-Speed Comparators
tPD (ns) 28 (high speed)
480 (low speed)
ICC (µA) (max) 500/5
VOS (mV) (typ) 0.2
VOS (mV) (max) 2
Logic Out TTL/CMOS
Latched Outputs No
Complementary Outputs No
VSUPPLY (V) 2.7 to 5.25
# Comparators 1
VIN (V) VEE-0.20 to VCC-1.5
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$2.17 @1k

Key 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/Uses

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

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 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.

Simplified Block Diagram

MAX975, MAX977: Pin Configuration MAX975, MAX977: Pin Configuration Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal