4_DIGIT_O7_INCH_LED_DlSPLAY

Published:2009/7/1 2:51:00 Author:May | From:SeekIC

National MA1013 clock module contains MOS LSI clock IC, display, power supply, and associated discrete components on single printed-circuit board that is easily connected to radio. Operates from either 50-Hz or 60-Hz inputs, and gives either 12- or 24-h display format. Nonmulti-plexed LED drive eliminates RF interference.Display is flashed at 1-Hz rate after powerfailure of any duration, to indicate need for resetting dock. Zero appearing in first digit is blanked. On 12-h version, dot in upper left corner is ener-gized to indicate PM.- MOSiLSl Databook, National Semiconductor, Santa Clara, CA, 1977, p 13-23-13-28.



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