AS1920_1 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 14
Technical content
1 General Description
its respective trip threshold. can be selected via an external resistor divider. Figure 1. Typical Application Diagram
2 Key Features
3 Applications
monitoring, and any multi-supply monitoring application. Table 1. Standard Products
4 Pinout
Figure 2. Pin Assignments (Top View) Table 2. Pin Descriptions
1 RESETN
VCCA. 1V sense, high-impedance input. Note: If this pin is not used it should be tied to VCC3 or VCC18. valid reset when the voltage on the primary input is down. Note: Bypass this pin to GND with a ≥0.1µF ceramic capacitor. provides power to the device. Note: Bypass this pin to GND with a ≥0.1µF ceramic capacitor.
4 VCC18
5 VCC35 VCC3
5 Absolute Maximum Ratings
Table 3. Absolute Maximum Ratings State Surface Mount Devices”.
6 Electrical Characteristics
VCC18 = 1.8V, VCC3 = 3V, VCCA = VCC3, TAMB = -40 to +85ºC (unless otherwise specified). Table 4. Electrical Characteristics
- Measured from the time (t1) when the input passes through the input threshold voltage (VRTX) to the time (t2)
when RESETN passes through 1.5V.
7 Typical Operating Characteristics
TAMB = +25ºC (unless otherwise specified). Figure 3. IVCC18 vs. Temperature Figure 4. I VCC3 vs. Temperature; VCC3 = 3V Figure 5. Supply Current VCCA vs. Temperature Figure 6. V OH/RST vs. Temperature; VCC3 = 3V Figure 7. tRST vs. Temperature; VCC3 = VCCA = 3V Figure 8. t UV vs. Temperature; VCC3 = VCCA = 3V
8 Detailed Description
three monitored supply voltages falls below its respective trip threshold. low current requirements and strict monitoring requirements. Figure 9. AS1920 Block Diagram Figure 10. VCC Monitor Timing Diagram
Figure 11. AS1922 Block Diagram
9 Application Information
pin RESETN low as soon as the primary input pin is ≥1V or the secondary input pin is ≥1V. nal timer will be started and RESETN will be driven high after 200ms. teed until VCC3 and VCC18 < 1V. VCC18 and operating from a 1.8V supply will assure the continuous assertion of RESETN. Note: Pin VCC3 must be used in all configurations. cations since most microprocessors and other circuits do not operate with a supply voltage < 1V. will ensure RESETN is held low (see Figure 12). Figure 12. Typical Application w/Resistor on RESETN Output to GND excess supply current, therefore a value of 100kΩ is recommended for the pulldown resistor.
The devices are available in an 5-pin SOT23 package. Figure 18. 5-pin SOT23 Package
- All dimensions in millimeters.
- Foot length measured at intercept point between datum A and lead surface.
- Package outline exclusive of mold flash and metal burr.
- Package outline inclusive of solder plating.
- PKG ST 0003 Rev A supersedes SOT23-D-2005 Rev C.
The devices are available as the standard products shown in Table 5. Table 5. Ordering Information
www.austriamicrosystems.com Revision 1.00 14 - 14 AS1920/AS1922 Datasheet Copyrights Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, 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. austriami- crosystems 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 life- sustaining 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 tech- nical 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 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact