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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Would you like to answer one of these unanswered questions instead? A high output is intended to light the segment. Armandas 6, 1 23 You can get it on ebay. Nov 20, 6. 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.
I might have some or chips laying around let me see though Wierd smartphone is comming alive Posted by Bobvayne in forum: I have learnt about the and When I connect an input, the LEDs doesn’t form numbers but they light up randomly. Other than a little more conditional logic datasueet and a few more stages, there’s nothing stopping you from building a full digital clock with hours, minutes, and seconds. Spehro Pefhany k 4 Here is a link to a video I made on instagram of mine working using this schematic: Your name or email address: When you connect the LED, the leg that is normally connected to ground should be connected to thethe leg that is normally connected to voltage source should be connected to voltage source.
Note that this is an ancient display and an ancient TTL chip both are museum old and because dtaasheet TTL open inputs will read as ‘high’. Nov 20, 4. No, create an account now. The is obsolete. Home Questions Tags Users Unanswered.
(PDF) 7448 Datasheet download
Nov 23, 8, 6, Then just map the pins correctly again, from datasheet: 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.
Nov 20, Simply wire the respective letters a. Note that this datasheet illustration is a bit messed up and the bottom segment is D not Eand next segment clockwise lower left is E. However, they don’t seem to mention that you need to have the inputs of the connected to something for it to work like you want it to. Oct 2, 17, 5, I am sure the guys who made this IC knew what they were doing, but my question is why are the outputs exactly opposite of what you would expect.
How to connect decoder to 7-segment display?
Pin 5 should go to GND. Nathan Hale likes this.
It was designed to sink current when using common anode 7-segments LED. Before you go looking for obsolete ICs, daasheet us your circuit diagram and we can offer a solution. Nov 20, 1.
Is IC power required? You can use a diode tester or a simple voltage source and a resistor to determine the pinout of your particular display. This is standard and is shown in the SN datasheet: The difference in voltage between pin and the voltage source is too small to light up the LED, so there is no voltage drop across the LED or the drop is very eatasheet and no current flow. Oct 28, 2. Hi guyshope all is well with everyone.
Nov 20, 5. Danny Sebahar 9. Posted by ljbp in forum: Nov 20, 9. Feb 19, 4, Nov 20, 7.
Posted by praondevou in forum: You need to tie them to appropriate logic levels RBI should be ‘0’ if you want to display a zero. Then just map the dqtasheet correctly again, from datasheet:. Mar 31, 23, 7, If you just checked the output voltage of unloaded 5V TTL signals when they were HI it was not uncommon to see them in the 3.
This is standard and is shown in the SN datasheet:. I just want to know the right way to connect the output pins of to the pins of 7-segment display? Nov 20, 3. Do you already have an account?