GN809

ISSUED DATE :2006/08/18 REVISED DATE : GN809 Description Processor Supervisory The GN809 family allows the user to customize the CPU reset function without any external components. The user has a large choice of reset voltage thresholds and output driver configurations, all of which are preset at the factory. Each wafer is trimmed to the customer’s specifications. These circuits monitor the power supply voltage of up based systems. When the power supply voltage drops below the voltage threshold a reset is asserted immediately (within an interval TD1). The reset remains asserted after the supply voltage rises above the voltage threshold for a time interval, TD2. The reset output is active low (RESETB). The reset output may be configured as either push/pull or open drain. The state of the reset output is guaranteed to be correct for supply voltage greater than 1V. Space saving SOT-23 package and micropower quiescent current (VTH(MAX) 0.8*VIN - - V VIN= VTH-100mV, TA=-40 : ~ +85 : TA=-40 : ~ +85 : 80 40 150 230 S mS N ote 1: The data based on V TH=2.7V part type. GN809 Page: 2/4 ISSUED DATE :2006/08/18 REVISED DATE : Ordering Information ( contd.) P art Number GN809-20 GN809-23 GN809-29 GN809-46 Marking 820XX 823XX 829XX 846XX Output Voltage 2.00V 2.32V 2.93V 4.63V P art Number GN809-21 GN809-26 GN809-31 Marking 821XX 826XX 831XX Output Voltage 2.10V 2.63V 3.08V Timing Diagram Application Information Supply Transients These device have a certain immunity to fast negative going transients. In the following pages the graph titled “Glitch Rejection” indicates the maximum allowable glitch amplitude and duration to avoid triggering an unintended reset. As shown in the graph shorter transient can have large amplitudes without triggering resets. Characteristics Curve GN809 Page: 3/4 ISSUED DATE :2006/08/18 REVISED DATE : GN809-26 GN809-26 GN809-26 210 190 170 150 GN809-26 130 110 90 Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C. TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165 GN809 Page: 4/4