Electronic – 7-Segment Decoder outputs/LED display

Without additional driver ICs the 4056BPP is unsuited to driving LED displays.

At 25 degrees C it is capable of sourcing slightly under 1 mA with a 5V supply and capable of sinking about 0.5mA per segment. While this may produce a glimmer in your displays it is far below the drive level that is acceptable for something sold to drive LED displays - you would be entirely justified in returning them for a refund.

Logic wise, if they do what you want funtionally you could add output drivers. This could be by using ag a ULN2803 or ULN2003 type darlington transistor driver array ICs, or by using indifidual driver transistors - one per segment. The cost is not especially high, and you will learn worthwhile things along the way, but it should not be necessary.

What IC did you ask for?

Usually, suppliers like Mouser are easy to deal with, respond promptly, sell in small quantities and are reasonably priced if not always actually 'cheap'.

'46 and '47 are for common-anode LEDs, whereas '48 and '49 are for common-cathode LEDs.

For the common-anode types, '46 allows a higher drive voltage than '47. For the common-cathode types, the difference between '48 and '49 is that '48 has "ripple-blanking input" (for suppressing leading zeroes), which the '49 has not.

There also are '246, '247 and '248 types that work like the above mentioned ones, but use a slightly different display pattern for "6" and "9" (namely with "tails").