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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Nathan Hale likes this. What IC is this? Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution. I’ve connected a decoder to 7-segment display as shown in figure.

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. Note 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’. Posted by iMayne in forum: This is standard and is shown in the SN datasheet:.

Your name or email address: No, create an account now. Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A. Nov 4748, If I am reading it right.

Posted by hihihi8 in forum: Wierd smartphone is comming alive Posted by Bobvayne in forum: Simply wire the respective letters a.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have learnt about the and Nov 20, 6.


Making AI, Drones, dataaheet Robotics More Accessible The “as-a-Service” model is changing the way innovators use new technologies—sometimes by giving access to new technologies that would be out of their grasp otherwise. All segments are extinguished when a low logical zero signal is applied to pin 4 OUT. Common cathodemeaning the negative connection of all of the LEDs is tied together. Home Questions Tags Users Unanswered.

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. Nov 20, 4. A high output is intended to light the segment. I just want to know the right way to connect the output pins of to the pins of 7-segment display?

You May Also Like: The outputs are open-collector but have internal 2K ohm pull-up resistors and have datashet maximum low-level output sink current of 6 milliamperes 6mA. Nov 20, 2. Hi guyshope all is well with everyone.

74LS48 BCD to 7-segment Decoder Driver IC | Warefab

When I connect an input, the LEDs doesn’t form numbers but they light up randomly. Mar 31, 23, 7, 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. A microcontroller can be programmed to perform the binary to decimal conversion and then use a look-up chart to satasheet the segment conversion.

Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. If you’re kind enough to send me your address I can send you some.


The difference in voltage between pin and the voltage source is too small to light up the LED, xatasheet there is no voltage drop across the LED or the drop is very small and no current flow.

(PDF) 7448 Datasheet download

Nov 20, 8. Danny Sebahar 9. Then just map the pins correctly again, from datasheet:.

Nov 20, Yes, my password is: 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.

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: Shown above, is an example application of the 74LS48 7-seg decoder circuit. 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 datashedt connected to voltage source.

Like the other two most popular answers, your 7 segment display needs to be connected to the properly Outputs to Seven-segment display inputs: Then just map the pins correctly again, from datasheet: