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???
02/14/09 17:16
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#162418 - How are you using the '4094?
Responding to: ???'s previous message
Perhaps a resettable SIPO register would be a better choice. 74HC164, among others, is resettable. There are numerous choices in both 4000-series (operates up to 15 volts) and 74HC-series (no more than 6 volts)

Had you taken even one second to look at the datasheet, you'd know that the '4094 is a Serial-In-Serial-Out register that, among other things, has an 8-bit parallel output register in it.

On the rising edge of the CLOCK, the shift register portion operates as a shift register normally would, each stage propagating the data on the prior stage to its own output. STROBE causes the data on the shift register to propagate to the output register, which is a tristate register, the outputs of which are enabled with OUTPUT ENABLE, else are in the high-impedance state.

The STROBE is the clock to the output registers. The Output Enable, enables the parallel output buffers.

You'll find the datasheet very helpful in figuring out how to use this device. The same is true of any other device, too, by the way. If you carefully read the datasheet, you'll find these devices are not so scary. They are, after all, just simple logic, concatenated to provide more complex functions.

RE




List of 60 messages in thread
TopicAuthorDate
Help Req:Working of 8-bit SIPO Shift Register in LED Display            01/01/70 00:00      
   Look at some datasheets?            01/01/70 00:00      
      Sequence            01/01/70 00:00      
   Could you be more specific?            01/01/70 00:00      
      Got U!            01/01/70 00:00      
         New thread            01/01/70 00:00      
            OK...but            01/01/70 00:00      
               You just proved the point!            01/01/70 00:00      
               Here is a possible solution            01/01/70 00:00      
                  Rash assumption?            01/01/70 00:00      
                     you can use MPUs those has built-in flash            01/01/70 00:00      
                  EPROM with AT89S52            01/01/70 00:00      
               permanent?            01/01/70 00:00      
                  No....            01/01/70 00:00      
                     Non-Volatile Storage            01/01/70 00:00      
                        Still a Problem            01/01/70 00:00      
                           Obviously            01/01/70 00:00      
                              Design work before chip selection            01/01/70 00:00      
         What about LED drive current?            01/01/70 00:00      
            if you plan to multiplex ....            01/01/70 00:00      
               I know you're well versed in this context ...            01/01/70 00:00      
                  Phosphor persistence?            01/01/70 00:00      
                     That's in Erik's primary domain            01/01/70 00:00      
                        Todays LEDs turn on and off very fast            01/01/70 00:00      
                           Intermodulation            01/01/70 00:00      
                              you make some additional points, but            01/01/70 00:00      
                           But what about TV?            01/01/70 00:00      
                              persistence of the tube, I guess            01/01/70 00:00      
                                 Blind test?            01/01/70 00:00      
                                    Problematic test strategy            01/01/70 00:00      
                                       double blind ?            01/01/70 00:00      
                                          Blind tests, revisited            01/01/70 00:00      
                                             I have no such problem            01/01/70 00:00      
                                                For flimmer test too?            01/01/70 00:00      
                                                   done inside and outside            01/01/70 00:00      
                  Interlace            01/01/70 00:00      
                     Not Really            01/01/70 00:00      
               Maybe skip intensity and on-the-fly updates            01/01/70 00:00      
                  They haven not been discussed ... yet            01/01/70 00:00      
                     Forget All...........            01/01/70 00:00      
                        Don't you need a refresh memory?            01/01/70 00:00      
                        Table Lookup is Used            01/01/70 00:00      
                        Need buffering            01/01/70 00:00      
                        that is ridiculous            01/01/70 00:00      
                           character generation            01/01/70 00:00      
                              i think you got me...            01/01/70 00:00      
                                 No tricks involved            01/01/70 00:00      
                                 Here's one way ... but you'll have to code it yourself            01/01/70 00:00      
                                    thanks...i'll try it            01/01/70 00:00      
                                       how to reset HEF4094            01/01/70 00:00      
                                          difference between "strobe" and "output enable" pins?            01/01/70 00:00      
                                          Only be serially writing zeros to it...            01/01/70 00:00      
                                          How are you using the '4094?            01/01/70 00:00      
                                             Not so simple for a newbie...            01/01/70 00:00      
                                                perhaps you're right, Kai            01/01/70 00:00      
                                                   Thanks, but            01/01/70 00:00      
                                                      Did you even read the prior posts?            01/01/70 00:00      
                                                         multiple parallel outputs            01/01/70 00:00      
                                                            actually, yes!            01/01/70 00:00      
   Telephonic discussion            01/01/70 00:00      

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