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, Posted by ljbp in forum: Making AI, Drones, and 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.

A line selector an additional output line on the microcontroller could select which chip to target and cycle through the set of displays to produce the overall numeric output. Nathan Hale likes this. Mar 31, 23, 7, When I connect an input, the LEDs doesn’t form numbers darasheet they light up randomly.

You need to tie them to appropriate logic levels RBI should be ‘0’ if you want to display a zero.

Like the other two most popular answers, your 7 segment display needs to be connected to the properly Outputs to Seven-segment display inputs: If I am reading it right. Nov 20, 7. 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’ve connected a decoder to 7-segment display as shown in figure.

The Everything-as-a-Service Business Model: Oct 2, 17, 5, Is IC power required? Shown above, is an example application of the 74LS48 7-seg decoder circuit. When 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.

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. A high output is intended to light the segment. Posted by hihihi8 in forum: Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A.

7447 IC is wierd!

To build a simple digital counter, consider using the decade counter. Danny Sebahar 9. Pin 5 should go to GND. Each segment on a 7-segment display is designated a letter A-G. Would you like to answer one of these unanswered questions instead? This is standard and is shown in the SN datasheet: The pinout is here:.


74LS48 Datasheet

Yes, my password is: The outputs are open-collector but have internal 2K ohm pull-up resistors and have a maximum low-level output sink current of 6 milliamperes datashset. Nov 20, 2. If you’re kind enough to send me your address I can send you some.

Here oc a link to a video I made on instagram of mine working using this schematic: I have learnt about the and It was designed to sink current when using common anode 7-segments LED. Then just map the pins correctly again, from datasheet:.

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’. Your name or email address: Armandas 6, 1 23 Nov 20, 3.

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. Nov 21, Nov 23, 8, 6, Nov 20, 5. You can use a diode tester or a simple voltage source and a resistor to determine the pinout of your particular display.

Nov 20, 8.