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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Which I have interpreted as being: Home Questions Tags Users Unanswered. A tristrate output can have 3 different states: Although it is not 74ps241 practice” to do this, unconnected LS TTL inputs 74lx241 usually float high, as PeterBennet has already kindly explained. Therefore it is also no surprise that when you did connect pins 17 and 19 to Vcc, the LED stayed lit. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

A 74LS or any 74LS family part will normally see an unconnected input as a High – you need to connect inputs datashee to Ground to input a Low. Note that you may not enable both G inputs e.


(PDF) 74LS241 Datasheet download

From what I read, if two input are high on a buffer, then the output will be high. It is likely that the output remained in a high-impedance state, so the LED did not light. For some reason, this isn’t working on my circuit.

Post as a guest Name. Unless you know exactly what you are doing and its datashet, do not apply voltages to the other pins of an IC, without the correct power supply voltage s also being supplied to its specified power pins i. Which I have interpreted as: But I thought gate like those didn’t need to be protected.

74LS241 Datasheet PDF

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. These ‘G’ inputs must be activated in 74lss241 to have the buffers connected to them pull their outputs low or high, depeding on their input.

Your explanation “two input are high” sounds more like the definition of an AND gate. When you connected [3.

74LS datasheet, Pinout ,application circuits OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS

This will also cause behaviour which is different from the behaviour when correct power is connected. And when I connect the Vcc pin, without 19 and 17, my led is on, where I expected this to be off.


By clicking “Post Your Answer”, datasjeet acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

I have put a led on the 3 output pin, in order to test the output. Then [you connected 3.

74LS 데이터시트(PDF) – Motorola, Inc

So here is what I did: 74ls421 didn’t put any resistors on the input. And when I connect the Vcc pin [ Understanding how a tristate buffer works 74LS Ask Question.

Do you understand WHY we have tri-state outputs? What does “put a led on the 3 output pin” mean?

Sign up using Facebook. But my led at pin 18 just glow dimly and never change state, no matter if pin 2 is high or not connected.

Why is my microcontroller passing a current through it when not connected? And we still don’t know how you have your LED connected????

So your first tests were done without any power connected to the Vcc pin! I have tried other gate 19 with 15, 13, 11 and I have the same behavior.