74LS241 DATASHEET PDF
SN54/74LS • SN54/74LS • SN54/74LS DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified). S. b l. P. 74LS Octal Buffers AND LINE Drivers WITH 3-state Outputs SN74S, SN74S OCTAL BUFFERS Details, datasheet, quote on part number: 74LS Texas Instruments 74LS Buffers & Line Drivers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments .
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OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
Do you understand what a buffer is and why we use it? A 74LS or any 74LS family part will normally see an unconnected input as a High – you need to connect inputs directly to Ground to input a Low. Your explanation “two input 74lx241 high” sounds more like the definition of an AND gate.
SE topics where powering devices via other pins, instead of the power pins, caused unexpected behaviour: Please show the schematic diagram. I’m trying to understand how the 74LS works. For some reason, this isn’t working on my circuit. I would have guessed the current gain was more than 0. And when I connect the Vcc pin, without 19 and 17, my led is on, where I expected this to be off.
Sign up using Facebook. I was expecting that my led will be off with pin 17 not connected but pin 19 still high, and the led on with 17 and 19 high, but this is not happening. SE topics where powering devices via other pins, instead of the power pins, caused unexpected behaviour:. Which I have interpreted as: Texas Instruments discusses some of these results of reduced voltage power supply voltages to ICs, in this short ” Designing With Logic ” document.
Therefore it is also no surprise that when you did connect pins 17 and 19 to Vcc, the LED stayed lit.
I have put a led on the 3 output pin, in order to test the output. The LED being lit is not a surprise.
74LS 데이터시트(PDF) – Motorola, Inc
I didn’t put any resistors on the input. And we still don’t know how you have your LED connected???? This will also cause behaviour which is different from the behaviour when correct power is connected. Sign up or log in Sign up using Google. I have the feeling that I have datashwet the schematic, but the fact is this is not working. And if I’m connecting pin 19 and 17 to be high, I’m expecting that my led will be brighter, but it just glow dimly, no matter if pin 17 is high or not connected.
This is not unexpected, since you didn’t power the IC via its power pins for this test. Then [you connected 3.
If you use a 5V power supply, and make sure this is always connected to the device Vcc and Gnd pins see belowthen you should see expected behaviour.
Another issue I’ve observed is parts that behave as though pairs of pins are connected via PNP transistor, such that excessive voltage on one will cause the device daasheet source current into the adjacent pin. Mr Bonjour 1 2 Unless you know exactly what you are doing and its consequences, do not apply voltages to the other pins of an IC, without the correct power supply voltage dattasheet also being supplied to its specified power pins i.