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| a u s t ri a m i c r o s y s t e m s AS1976, AS1977 U l t r a - L o w C u r r e n t , 1 . 8 V C o m pa r a t o r s P ro du c t B ri e f 1 General 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 powermanagement and power-monitoring systems. The comparators are available as the standard products listed in Table 1. Table 1. Standard Products Model AS1976 AS1977 Output Type Push/Pull Open-Drain Current 200nA 200nA 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 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 ! ! ! ! ! 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. 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 builtin battery power-management and power-monitoring circuitry. The AS1976/AS1977 are available in a 5-pin SOT23 package. ! ! ! 3 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. Figure 1. Block Diagram 5 VCC AS1976/ AS1977 + - 1 OUT 3 IN+ 4 IN- 2 VEE (c) 1997-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 0.21 1-2 AS1976, AS1977 Product Bri ef austriam i c r o systems Copyrights Copyright (c) 1997-2006, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 e-mail: info@austriamicrosystems.com For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com austriamicrosystems - a leap ahead 2-2 (c) 1997-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 0.21 |
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