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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Here are the datasheets: Power it with 5V.
Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption. Look for I OH. CrossRoads on Dec 29, Email Required, but never shown. Terminate to High or Low as needed. Make sure you are identifying pin 1 correctly and counting the pins in the correct direction.
The 74LS08 circuit issue must be a wiring one. This is the recommended operating current that can be sourced.
The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it.
SN74LS08N, BG-ELECTRONICS SN74LS08N, SN74LS08, 74LS08N, 74LS08
MarkT Brattain Member Posts: Check with a DVM to make sure you have things hooked up correctly and that the voltage is correct. Not the wire colour All logic circuits need decoupling as a matter of course, right next to each chip. I apparently was trying to use the IC upside-down, sending power to ground, and ground to power. 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.
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. I meant you could make use of the breadboard bus marked with a blue line.
Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better. Once you see the outputs from the AND gates acting like they should, hook them up to the next stage. The last thing you did is where you should start looking.
BobT 5 7.
(PDF) SN74LS08N Datasheet download
Show us a good image of your wiring. LarryD on Dec 29, 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. 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 datasjeet.
Make sure power’s on pin 14 and ground is on pin 7. Now with Unlimited Eagle board sizes! Apologies if I am missing something obvious, I am a first year EE student. Read times previous topic – next topic. Yes, apparently you did next time I’ll zoom out a bit more when looking at a picture.
Note that I OL is 8mA, which is the recommended sink current. I dn74ls08n this quality is good enough. The chip should not heat up. Sign up using Email and Password.
See my previous post for output driving currents and suggestion. Sn7ls08n as a guest Name. Glad things are working now. Start creating good wiring habits.
Disconnect everything but power and ground. Thanks for the advice. I’m not using any of the AND gates.