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171 Threads found on edaboard.com: Ttl Input
In about 1967 I worked with an office computer that used these DTL circuits in ICs. Then came ttl then came Cmos logic ICs.
The CMOS logic gate familly has a quite low output current capacity, which also varies a lot with temperature. I would recommend you consider using ttl logic gates, instead; just to try.
If the voltage of an input is between the Schmitt threshold levels then the output stays at the high or low it last was at. 74xxx and 74LSxxx are old fashioned ttl logic that have inputs with a bias current that pulls them high if they are floating. They require a fairly high current to ground to drive them low.
The 7447 is very old ttl logic that has a 1.6mA max input current that tries to pull an input to a logic high. The resistor to ground at an input to cause a logic low input is 500 ohms (not 10k ohms) but 250 ohms is better. If the IC is a 74LS47 then the resistor to ground can be as high as 2k or 4k ohms.
hi, The Neo serial levels are 3.3V 'ttl' levels, you need a level shifter between this module and your PC. A MAX232 i/c would be suitable, also you need a resistive divider between the MAX232 RX out to the Neo RX input. The divider will reduce the 5V signal from the MAX to 3.3v for the Neo. Do you follow OK.? E
Im looking for a small package single 2-input Positive-NAND Gate that work with ttl(5V) voltage ... Let me G00gle that for you ;-)
I have an interesting device I must interface with. It uses 0V to -6V logic. Where -6V is a logic low and 0V is a logic high. I faked this by using a 5V isolated supply but there are quite a few grounding issues when someone uses the wrong cable (cable with ground hooked to the 0 reference). Transmitter. I thought this could easily be done us
You say: The 4-bit DIP switches are in series with 100K Ohm resistors which in turn are connected to the + Power Rail. There are 10K Ohm resistors in series with the cathode side of the LED’s. So it seems that with the switch open the corresponding input is left floating. It just so happens that floating ttl inputs will drif
Are you just measuring an active high ttl/ST output with a voltmeter, or seeing the waveform of a pulsed output at high frequency with an oscilloscope ?
Hi all, this is my first post here, but the boards have been extremely useful over the years! I am running a test in which I need to switch positive and negative power lines on simultaneously, which will be in the range +/-13 V to +/-28 V. I would like to drive the switches with a single 5 V input (from an Arduino). The test units will draw ~350
I want to find a circuit to level translate the output of the coil (12v) to the input of a microprocessor.
I always see these clamping diodes on the input pins of logic IC chips, mostly for ttl chips, any reasons why for ttl logic chips and not for CMOS logic chips? The Clamping diodes are to protect the input pins of the logic IC chips to go into the "negative region" which will damage the input section of (...)
Various RF TX/RX modules typically need ttl input and give ttl output. Some require to add a pull-up resistor at output (Open-collector). At 433 MHz, over a short distance such modules only need quarter-wave antennas to operate but often the transmission fails due to obstacles or multipath propagation. Positions of antennas must be (...)
do you have pull up on Tx pin ? you can reduce the value as low as 470 ohms and pull down on Rx pin ? value about 2,2K to transmit signal with low impedance..and reduce problem due to noisy environement.. You can also add CMOS trigger defore RX input.. like 74LS14 (ttl) or CMOS CD4093-B or MC74VHC1GT14 or ...
I need to use 8/16 bit buffer ic to drive large number of LEDs using micro-controller. Each channel should be capable of sourcing 3 amps and the inputs should be ttl compatible to connect to the uC. If the output voltage can be variable , i can easily control the intensity of the leds. Is there is any IC having the mentioned features or s
A reason some engineers use CMOS instead of ttl is because of the greater noise immunity. However they forget that due to CMOS.s much higher impedance's it is much easier to induce noise in to a CMOS circuit which negates the advantage CMOS has here. Another reason is because of the lower power consumption, however CMOS is a lot slower than ttl. So
The first circuit tries to use old 5V ttl with 12V Cmos but they do not go together. It also uses very old 741 opamps which are horrible for this high gain at high audio frequencies circuit. It has a lowpass filters at the inputs that cut 8300Hz by -3dB and higher audio frequencies are cut more. FM is supposed to be flat to 15kHz but the old 741 o
74xxx is Standard power ttl which is normally floating input =logic "1" at 1.3V but for noise margin>=2V is valid and <=0.8V is a "0". Thus they will count if enabled using contact close to 0V on clock in. But best practise uses 10k-100k pull-up to5V. 4xxx , 14xxx series is original CMOS which is random on floating and for ESD reasons is never le
Try CMOS with 1M feedback. ttl won't work because the input and output levels are asymmetric and it won't self bias. Vin =1.3 while Vout averages around 2.5 or less for ttl.
max 232 is mainly to convert voltage level from ttl to -9vdc / +9vdc and also curren amp to prevent damage for pic ic used hope it helps ziad