Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs change together when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous ripple-clock counters. The outputs of the four master-slave flip-flops are triggered by a low-to-high level transition of either count clock input. The direction of counting is determined by which count input is pulsed while the other count input is held high. The counter is fully programmable; that is, each output may be preset to either level by entering the desired data at the inputs while the load input is low. The output will change independently of the count pulses.
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The on-board IC illuminates the display by sequentially turning ON , block diagram. The refresh circuit is controlled either by an internal 57 kHz clock or by an external clock. The CLS pin selects the clock source. The CLK pin either inputs the external clock or outputs the internal clock. The Figure 1. Figure 2 shows the block diagram of a synchronized external dimming circuit. A common. The clock , counters with a common reset signal.
Figure 2 shows the block diagram of a synchronized external dimming. See Figure 1. Figure 1. Abstract: pin diagram of counter ic ic ic ic pin diagram ic TTL ttl pin configuration IC 74LS Text: counted. The de vice can be cleared at any time by the asynchronous reset pin - it may also be loaded in parallel by activating the asyn chronous parallel load pin.
SN 74LS equivalent gates. Note 2. Abstract: pin diagram of counter ic ic pin configuration LM ic counter pin configuration pin configuration ic Text: counted.
74LS193 Counters. Datasheet pdf. Equivalent