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ICS1892 датащи(PDF) 108 Page - Integrated Circuit Systems |
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ICS1892 датащи(HTML) 108 Page - Integrated Circuit Systems |
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108 / 148 page ![]() ICS1892, Rev. D, 2/26/01 February 26, 2001 108 Chapter 9 Pin Diagram, Listings, and Descriptions ICS1892 Data Sheet © 2000-2001, Integrated Circuit Systems, Inc. All rights reserved. REF_IN 53 Input (Frequency) Reference Input. This pin can be connected to either of the following frequency reference sources: • A 25-MHz crystal • A 25-MHz oscillator For the tolerance of the clock that is used, see Section 10.5.1, “Timing for Clock Reference In (REF_IN) Pin”. REF_OUT 52 Input (Frequency) Reference Output. When the frequency reference source used is a: • A 25-MHz crystal, this pin is used in combination with the REF_IN pin. • A 25-MHz oscillator, this pin is left unconnected. RESET* 22 Input (System) Reset (Active Low). • When the signal on this active-low pin is logic: – Low, the ICS1892 is in hardware reset. – High, the ICS1892 is operational. • For more information on hardware resets, see the following: – Section 5.1.2.1, “Hardware Reset” – Section 10.5.17, “Reset: Hardware Reset and Power-Down” Table 9-5. Configuration Pins (Continued) Pin Name Pin Number Pin Type Pin Description |
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