7448 IC DATASHEET PDF
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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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 6mA.
You can get it on ebay. However, if pins are limited on the microcontroller, it can be advantageous to use ICs in a multiplexing fashion to drive the 7-segment displays. Posted by hihihi8 in forum: Is IC power required? In this method, the microcontroller would send BCD binary coded decimal on 4 output pins to the chips.
If I am reading it right.
7447 IC is wierd!
You can use a diode tester dtasheet a simple voltage source and a resistor to determine the pinout of your particular display. Hi guyshope all is well with everyone. Mar 31, 23, 7, This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things.
Here is what is going to happen. For example here is the table to display the number 1. This package dattasheet a positive-logic Binary Coded Decimal BCD input and converts it to the proper pattern necessary to daatsheet a 7 segment display. Nov 20, 8. Nov 20, 1.
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.
Thank you for your interest in this question. 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. Datasheet 20, 7. If you’re kind enough to send me your address I can send you some.
(PDF) 7448 Datasheet download
Apr 28, 1, Your name or email address: To build a simple datasyeet counter, consider using the decade counter. A PWM pulse-width modulated signal can be applied to this pin oc 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.
Do you already have an account? Feb 19, 4, 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.
BCD to 7-Segment Decoder and Driver (For Common Cathode)
Danny Sebahar 9. 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. Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution. A high output is intended to light the segment.
Oct 28, 2. Then just map the pins correctly again, from datasheet:. Oct 2, 17, 5, The is obsolete.