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Index Electronics concepts Digital Circuits Reference Tocci Digital Systems, Sec 5-19. | ||
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BCD or Decade CounterA BCD counter or decade counter can be constructed from a staight binary counter by terminating the "ripple-through" counting when the count reaches decimal 9 (binary 1001). Since the next toggle would set the two most significant bits, a NAND gate tied from those two outputs to the asynchronous clear line will start the count over after 9. |
Index Electronics concepts Digital Circuits Reference Tocci Digital Systems, Sec 7-2. | ||
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Index Electronics concepts Digital Circuits Reference Tocci Digital Systems, Sec 5-19. | ||
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Counter and DecoderThe 14-pin 7490 counter chip and the 16-pin decoder chip are often used together to drive 7-segment displays. |
Index Electronics concepts Digital Circuits Reference Mims, Getting started... p. 90,117 | ||
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