AS1976_07 datasheet(2/18 Pages) AMSCO

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AS1976, AS1977

Ultra-Low Current, 1.8V Comparators

Dat a Sh eet

www.austriamicrosystems.com

Revision 1.01

1 - 17

1 General Description

The AS1976/AS1977 are very low-current comparators

that can operate beyond the rail voltages and are guar-

anteed 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 the standard products

listed in Table 1.

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

The AS1977 open-drain output can be pulled beyond

VCC to a maximum of 6V > VEE. This open-drain model

is ideal for use as a logic-level translator or bipolar-to-

unipolar converter.

Large internal output drivers provide rail-to-rail output

swings with loads up to 8mA. Both devices feature built-

in battery power-management and power-monitoring cir-

cuitry.

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

package.

Figure 1. Block Diagram

2 Key Features

CMOS Push/Pull Output Sinks and Sources 8mA

(AS1976)

CMOS Open-Drain Output Voltage Extends Beyond

VCC (AS1977)

Ultra-Low Supply Current: 200nA

Internal Hysteresis: 3mV

3V-to5V Logiv-Level Translation

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

3 Applications

The devices are ideal for battery monitoring/manage-

ment, mobile communication devices, laptops and

PDAs, ultra-low-power systems, threshold detectors/dis-

criminators, telemetry and remote systems, medical

instruments, or any other space-limited application with

low power-consumption requirements.

Table 1. Standard Products

Model

Output Type

Current

AS1976

Push/Pull

200nA

AS1977

Open-Drain

200nA

AS1976/

AS1977

–

VCC

IN+

OUT

VEE

IN-

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