DM74LS48 BCD to 7-Segment Decoder
January 1992
DM74LS48 BCD to 7-Segment Decoder
General Description
The ’LS48 transla...
DM74LS48 BCD to 7-Segment Decoder
January 1992
DM74LS48 BCD to 7-Segment Decoder
General Description
The ’LS48 translates four lines of BCD (8421) input data into the 7-segment numeral code and provides seven corresponding outputs having pull-up resistors as opposed to totem pole pull-ups These outputs can serve as logic signals with a HIGH output corresponding to a lighted lamp segment or can provide a 1 3 mA base current to
npn lamp driver
transistors Auxiliary inputs provide lamp test blanking and cascadable zero-suppression functions The ’LS48 decodes the input data in the pattern indicated in the Truth Table and the segment identification illustration
Connection Diagram
Dual-In-Line Package
TL F 10172 – 1
Order Number DM74LS48M or DM74LS48N See NS Package Number M16A or N16E
C1995 National Semiconductor Corporation
TL F 10172
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings (Note)
Supply Voltage Input Voltage Operating Free Air Temperature Range DM74LS Storage Temperature Range 7V 7V 0 C to a 70 C
b 65 C to a 150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation
Recommended Operating Conditions
Symbol VCC VIH VIL IOH I...