SN74LS08N .. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied. SN74LS08N datasheet, SN74LS08N pdf, SN74LS08N data sheet, datasheet, data sheet, pdf, Motorola, QUAD 2-INPUT AND GATE. SN74LS08N from Texas Instruments High-Performance Analog. Find the PDF Datasheet, Specifications and Distributor Information.
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(PDF) SN74LS08N Datasheet download
Make sure you are identifying pin 1 correctly and counting the pins in the correct direction. Power it with 5V. The chip should not heat up. I am not using any resistors. Disconnect everything but power and ground. All logic circuits need decoupling as a matter of course, right next to each chip. Apologies if I am missing something obvious, I am a first year EE student.
Here are the datasheets: You would fare better to use modern CMOS families like 74HC, so 74HC08 and gates, 74HC14 not gates everyone uses the ’14 because it has schmitt-trigger inputs which are very useful for signal conditioning.
Glad things are working now.
SN74LS08N and SN74LS05N doesn’t work?
See my previous post for output driving currents and suggestion. If it does, try an74ls08n different chip- the original one may have been fried. Email Required, but never shown. Look for I OH. Thanks for the advice. This is the recommended operating current that can be sourced. Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better.
Now with Unlimited Eagle board sizes! I meant you could make use of the breadboard bus marked with a blue line.
Start creating good wiring habits. MarkT Brattain Member Posts: Daasheet 74LS08 circuit issue must be a wiring one. I am only powering the IC. I don’t understand, why OUT green cable still “high” and the LED on even if both inputs yellow cables are off here both are on.
Sign up using Facebook. Show us a good image of your wiring. Home Questions Tags Users Unanswered. Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption.
BobT 5 7. I’m not using any of the AND gates. The datasheet says that it requires a minimum of 4. I apparently was trying to use the IC upside-down, sending power to ground, and ground to power.
Terminate to High or Low as needed. Check with a DVM to make sure you have things hooked up correctly and that the voltage is correct. The last thing you did is where you should start looking. Make sure power’s on pin 14 and ground is on pin 7.
Sign up using Email and Password. I’ve got some logic gates from Texas Instruments and would like to understand why the left circuit doesn’t work while the right one works well and. Post as a guest Name. The key to troubleshooting these kind of problems is to break them down to their essentials and add stages only after what you start with is working properly.
The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it.