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The key is to detect the 6 in the upper nibble, since the maximum count is to be We will illustrate these things with the 74LS90 ripple counter. dataxheet

Motorola – datasheet pdf

The third member of the family, the 74LS92, has a modulo-6 counter as the second element, but otherwise is daasheet same. Counters that work this way are called synchronoussince everything happens at the effective clock edge. The two blocks are set-reset or SR flip-flops, that respond to the S and R inputs when the enable E is low.

Two counters are used, one for the tens upper nibble and one for the units lower nibble. Be sure to use despiking capacitors on the power adtasheet, since switching transients can be considerable. Secondly, there are the TTL counters of the ‘s family, the 74LSLS, which are 4-bit synchronous counters, with various arrangements for clearing, loading ddatasheet enabling. Textbooks seem to give useless methods of self-correction.

Also, a switch to disconnect the high voltage when the clock will not be observed as at night will extend the life of the Nixies.


The 32, Hz crystal is a small cylinder the very small watch crystals are too small to be practical; be sure you get one of the larger ones, about 2. The Nixies must be supplied with at least V on the anode, and this is the source of any datasheeet.

The assignment is arbitrary, but if we count in this order, the lsb varies more rapidly than the msb. This power supply works very well.

74HC74AN Datasheet, PDF – Alldatasheet

Test the counter by putting kHz on the clock, and you should read 1 kHz at Q G. Chip designers have been crafty enough that this has proved satisfactory in most cases.

All we need to do is move the 4 connection from the upper to the lower nibble. A glance at the logic diagrams for these chips show that the decoding is not as simple as for a Johnson counter. Such accuracy in a mechanical watch comes at a very great price, if it is available at all.

Preset and clear are independent of the clock and accomplished by a 74c74an level at the appropriate input.

For example, is eliminated at the next clock, requires two clocks, while needs four. The circuit is shown at the left.

74HC74AN – Dual D Flip-Flop

74hf74an A similar technique can be used with synchronous counters, but there is no such rowdiness. The counter counts on the positive edge of the clock signal applied to CK, provided the clock enable, CE, is low.


The 74HC logic family is functionally and pinout compatible. Connect the ENP’s together and tie them high. The load preset facility allows more flexible counting schemes.

The peak value of VAC is V, so it just datasheef the required level. The circuit is shown at the right. They have been picked up in HC logic, and a variant HC has even been added. The outputs go nearly to the supply rails, but can furnish only less than a mA. The decodes could also drive relays to activate any kind of display. The minutes counter counts from 00 to 59, the hours counter from 00 to The truth table for a JK flip-flop is shown at the right. If they wait for the active clock edge, they are called synchronous.

For example, if an 8-bit ripple counter is atthe next clock produces, and so xatasheet before finally reachingthe next static state. This configuration is nonstable; that is, it will not persist when pre. All these outputs are detected by the 74HC21 and used to clear the counter after the th count.

The minutes and hours counters of a clock can be realized with just two HC’s, and decoded with two HC42’s each.