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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Sign up using Facebook. You are lacking decoupling caps on your chips BTW – don’t get into that bad habit, nF ceramic for each chip is a good starting point. Once you have a nicely quiescent, powered up chip that doesn’t try to immolate itself you can start adding logic inputs and looking at the outputs.
Email Required, but never shown. Home Questions Tags Users Unanswered. This is the recommended operating current that can be sourced. 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 dataheet working properly. Power it with 5V. Sign up or log in Sign up using Google.
Once you see the outputs from the AND gates acting like they should, hook them up to the next stage. Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better. Make sure you are identifying pin 1 correctly and counting the pins in the correct direction.
SN74LS08N from Texas Instruments
I apparently was trying to use the IC upside-down, sending power to ground, and ground to power. I am not using any resistors. CMOS is symmetrical and you can drive loads either way. I’ve got some logic gates from Texas Dtaasheet and would like to understand why the left circuit doesn’t work while the right one works well and. The datasheet says that it requires a minimum of 4. MarkT Brattain Member Posts: Yes, apparently you did next time I’ll zoom out a bit more when looking at a picture.
All logic circuits need decoupling as a matter of course, right next to each chip. Unconnected inputs are not good news for CMOS logic though, can cause oscillations sn74os08n higher power consumption.
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That would tend to let the magic smoke out Disconnect everything but power and ground. I hope adtasheet quality is good enough. I meant you could make use of the breadboard bus marked with a blue line.
(PDF) SN74LS08N Datasheet download
If it does, try a different chip- the original one may have been fried. Sign up using Email and Password. Read times previous topic – next topic. Start creating good wiring habits. Make sure power’s on pin 14 and ground is on pin 7.
LarryD on Dec 29, Glad things are working now. Note that I OL is 8mA, which is the recommended sink current. Look for I OH. The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it.
The 74LS08 circuit issue must be a wiring one. Thanks for the advice. Post as a guest Name.