The SN54/74LS247 thru SN54/74LS249 are BCD-to-Seven-Segment
The LS247 and LS248 are functionally and electrically identical to the LS47 DECODERS/ DRIVERS
and LS48 with the same pinout configuration. The LS249 is a 16-pin version LOW POWER SCHOTTKY
of the 14-pin LS49 and includes full functional capability for lamp test and
ripple blanking which was not available in the LS49.
The composition of all characters, except the 6 and 9 are identical between
the LS247, 248, 249 and the LS47, 48 and 49. The LS47 thru 49 compose