The SN54/74LS, 1-of Decoder/Driver, is designed to accept BCD inputs and provide appropriate outputs to drive digit incandescent displays. The SN74LS, 1-of Decoder/Driver, is designed to accept. BCD inputs and provide appropriate outputs to drive digit incandescent displays. All outputs. SN74LSN. SN74LSNSR. ACTIVE. SO. NS. Green (RoHS. & no Sb/Br). CU NIPDAU. LevelC-UNLIM. 0 to 74LS
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Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet - semiconductor. 74LS Datasheet PDF - 1-of Decoder / Driver, 74LS pdf, 74LS pinout, 74LS equivalent, 74LS eplacement, SN74LS 74LS - Download as PDF File .pdf), Text File .txt) or read online.
The diode at output 1 - 3 isolates the resetting circuit's input from the other outputs in the group.
Stopping The Output Cycle The cycle can be stopped at a particular output by connecting that output to pin 7 of timer IC 1. The diode prevents the voltage at the output of the circuit from being fed back to IC 1 when the circuit is running normally.
Manual controls are used to reset and restart the circuit. No circuitboard is available for this circuit. The following diagram is an example of a circuit with a 40 step sequence.
NOTE: This circuit is not complete and is presented for information purposes only. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.
Alternately the circuit's clock could provide an output to and external circuit. When push button S1 is closed the output of the clock will go LOW and the output of the circuit will advance by one step. Additional 20 Step Circuits Shortened Sequence Length The number of steps in the sequence can be reduced by connecting an external resetting circuit to one of the outputs of the circuit.
In the example shown the reset pulse is approximately 0. NOTE: Due to the nature of timers, after a reset, the first clock pulse from IC 1 will be slightly longer than the normal clock pulses.
The reset circuit's input is shown connected to output 1 - 5 but can be connected to any of the 20 outputs. Switch S1 disables the shortened cycle. Shortened Sequence Length For Paralleled Outputs The next diagram illustrates how to connect the resetting circuit when outputs of the 20 Step circuit are connected in parallel.
The diode at output 1 - 3 isolates the resetting circuit's input from the other outputs in the group. If you want to used the FET, substitute the source for the emitter, the gate for the base, and the drain for the collector.
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Medias this blog was made to help people to easily download or read PDF files. If the 74LS will sink enough current, I think you should be able to meet your needs with a cascode stage, and this will only require one transistor and maybe one resistor per output.
I amy have misundertood you completely, but I think there is a much simpler solution. I assume that this means that I connect the outputs to my logic VCC via 74ps Thanks for your help on this guys!
I would then have bipolar NPN transistors with the collectors connected to 12V via resistors.