Description

The AS1976/AS1977 are very low-current comparators that can operate beyond the rail voltages and are guaranteed to operate down to 1.8V. Low input bias current, current-limiting output circuitry, and ultra-small packaging make these comparators ideal for low-power 2-cell applications including power-management and power-monitoring systems.

The comparators are available as following standard products:

The AS1976 push/pull output can sink or source current.

The AS1977 open-drain output can be pulled beyond VCC to a maximum of 3.6V > VEE. These open-drain versions are ideal for use as logic-level translators or bipolar-to-unipolar converters.

Large internal output drivers provide rail-to-rail output swings with loads up to 8mA. All devices feature built-in battery power-management and power-monitoring circuitry.

The AS1976/AS1977 are available in a 5-pin SOT23 package.

Key Features

• 200nA Ultra-Low Supply Current
• CMOS Push/Pull Output Sinks and Sources 8mA (AS1976)
• CMOS Open-Drain Output Voltage Extends Beyond VCC (AS1977)
• Internal Hysteresis: 3mV
• Guaranteed to Operate Down to +1.8V
• Input Voltage Range Operates 200mV Beyond the Rails
• Crowbar Current-Free Switching
• No Phase Reversal for Overdriven Inputs
• 5-pin SOT23 Package

Applications

The devices are ideal for battery monitoring/management, mobile communication devices, laptops and PDAs, ultra-low-power systems, threshold detectors/discriminators, telemetry and remote systems, medical instruments, or any other space-limited application with low power-consumption requirements.

Block diagram for AS1977 Comparator IC