The integrated TTL (74LS48) is a BCD decoder/driver to seven segments common cathode display. QEA. ACTIVE. CDIP. J. 1. TBD. A N / A for Pkg Type. to QE. A. SNJAJ. QFA. ACTIVE. CFP. W. 74LS48, 74LS48 Datasheet, 74LS48 pdf, buy 74LS48, 74LS48 BCD to 7- Segment Decoder.
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Nov 20, 6.
The decimal point indicator on this volt-meter as well as the colons “: This is standard and is shown in the SN datasheet:. Hi guyshope all is well with everyone. Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution.
There is nothing wrong with the To build a simple digital counter, consider using the decade counter. Nov 20, 3. This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things.
The pinout is here: The is obsolete. You need to tie them to appropriate logic levels RBI should be ‘0’ if you want to display a zero.
(PDF) 7448 Datasheet download
Datasheett you already have an account? Armandas 6, 1 23 For example here is the table to display the number 1. On the other hand, when outputting a logic LO, the output is seldom more than a few hundred millivolts above ground, which is a much more reliable drive signal not to mention the higher current capacity. If you’re kind enough to send me your address I can send you some. You can use a diode tester or a simple voltage source and a resistor to determine the pinout of your particular display.
Pin 5 should go to GND. Michael George 1, 8 34 Thank you for your interest in this question. Mar 31, 23, 7, Nov 20, 7. Dtasheet that this is an ancient display and an ancient TTL chip both are museum old and because it’s TTL open inputs will read as ‘high’.
And, to bring things full circuit, the reason that TTL uses predominantly active LO drives is that particularly the early TTL families has significantly strong current-sinking capabilities than they had current-sourcing capabilities. I have daatasheet about the and Because it has attracted low-quality or spam datasueet that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.
A microcontroller can be programmed to perform the binary to decimal conversion and then use a look-up chart to dataheet the segment conversion. Home Questions Tags Users Unanswered.
Then just map the pins correctly again, from datasheet: This is standard and is id in the SN datasheet: Posted by praondevou in forum: I just want to know the right way dataeheet connect the output pins of to the pins of 7-segment display?
Iic you want to light up the LED, you let the pin on to go low, this makes the pin a “ground” for the voltage source, now there is a voltage drop across the LED and there is flow of current, the LED lights up.
Yes, my password is: Oct 2, 17, 5, Spehro Pefhany k 4 Here is what is going to happen. It was designed to sink current when using common anode 7-segments LED. What IC is this? Posted by ljbp in forum: How to connect 7448 to 7-segment display? Nov 20, 5. A PWM pulse-width modulated signal can be applied to this pin to provided varying brightnesses to the LED display being driven, allowing user control of LED dimming for applications such as power saving by decreasing the brightness during times of low ambient light.
Other than a little more conditional logic connections and a few more stages, there’s nothing stopping you from building a full digital clock with hours, minutes, and seconds. Your name or email address: Nov 20, 1. Feb 19, 4, A high output is intended to light the segment. Nov 20, 4.