Rev. 6 — 3 December Product data sheet. Table 1. Ordering information. Type number Package. Temperature range Name. Description. Version. when gated with the Clock of the HC .. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in. HC datasheet, HC circuit, HC data sheet: TI – DUAL 4-BIT BINARY COUNTERS,alldatasheet, datasheet, Datasheet search site for Electronic.

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A doubler has been suggested, but this gives over V, which is a little high, although it would serve. The hours and minutes counters can be individually zeroed if desired. An obvious way is to use an LS47 BCD-to-7 segment decoder, as mentioned in the page on numerical indicator devices, or the LCD equivalent, also explained there, with a 7-segment display. As you said, you need to tie both CLEAR inputs low, because you don’t want to disturb the normal “ripple carry” behaviour of the counters.

For the LS74, the delay time is somewhere around 25 ns, so a bit counter will require about ns to settle down.

Hc393 datasheet pdf

This requires a slow change at the minutes level, as well as a rapid change for large alterations. The truth table for a JK flip-flop is shown at the right.

Only four are used in here, of course, but you will need them all later. Here’s a connection dataasheet The counter is reset when it reaches the state N, so the counter counts from 0 to N – 1.

Philips – datasheet pdf

The crystal, which is a small metal cylinder with fine wire leads, will not drive a Pierce oscillator made with an MPF Different colors could be used for the upper and lower nibbles.


The Nixies are a very pleasing display. Each of the outputs goes positive during its time interval, remaining low otherwise. The output is a 0.

Hc datasheet pdf

Note that only one element has to be lighted, and a single dropping resistor used. Note that level-sensitive flip-flops are immune to glitches, while edge-triggering can be bedeviled by them, so this change is not altogether beneficial.

We certainly do not want the binary digits flickering except in a science-fiction moviebut desire some more direct indication of the time in figures. You’ll need to choose a username for the site, which only take a couple of moments here. If dagasheet are building a clock, you will need two of these counters, one to count seconds up to minutes, the other to count minutes up to hours.

That will give you an output frequency of The is absurdly datssheet much less than a dollar when you think about what a vacuum-tube decimal counter would cost. If you cannot find any, element bar graph arrays would provide an unusual readout at low cost.

An LED blinking half-seconds shows when this signal is active. They are designed with this in mind, and we only have to find out how it is intended to be done. Unless TI has explicitly designated an individual product as meeting the requirements of a particular industry standard e.

It is necessary to keep the hd393 supplied to the regulator above 7.

Using products in an application does not by itself establish any safety features in the application. The decodes could also drive relays to activate any kind of display.


For example, is eliminated at the next clock, requires two clocks, while needs four. Product device recommended for new designs. Since it is very helpful to know how they work when using them, the fundamentals of electronic counters will be presented here, and the reader is encouraged to perform the experiments, which are simple but instructive. The LS or HC is a 3-to-8 decoder very useful in computers, the is a dual 2-to-4 decoder that could be used with the binary counters abovethe 41 a BCD-to decoder that gives high outputs for the unused codes A-F, and the a hex-to decoder in a pin DIP.

Buyers and others who are developing systems that incorporate TI products collectively, Designers understand and agree that Designersremain responsible for using their independent analysis, evaluation and judgment in designing their applications and that Designers havefull and exclusive responsibility to assure the safety of Designers’ applications and compliance of their applications and of all TI productsused in or for Designers applications with all applicable regulations, laws and other applicable requirements.

The low speed of the is of no consequence in clocks. Connect the ENP’s together and tie them high. Color-coded wire, for the digitswas used to make checking easy.

This was typical of early TTL.

Connect two LS’s in this way, with datasheett set up for normal counting. TI has taken andcontinues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.