DM74LS249 BCD to 7-Segment Decoder with Open-Collector Outputs
February 1992
DM74LS249
BCD to 7-Segment Decoder with Open-Collector Outputs
General Description
The 鈥橪S249 has active HIGH open-collector outputs and in-
corporates the Lamp Test and BI RBO inputs Additionally
the 鈥橪S249 will light the top bar (segment a) for numeral 6
and the bottom bar (segment d) for numeral 9
Connection Diagram
Dual-In-Line Package
Logic Symbol
TL F 10213 鈥?2
TL F 10213 鈥?1
V
CC
e
Pin 16
GND
e
Pin 8
Order Number DM74LS249N
See NS Package Number N16E
Pin Names
A
0
鈥?A
3
BI
LT
BI RBO
a鈥揼
Description
BCD Inputs
Blanking Input (Active LOW)
Lamp Test Input (Active LOW)
Blanking Input (Active LOW) or
Ripple Blanking Output (Active LOW)
Segment Outputs (Active HIGH)
C
1995 National Semiconductor Corporation
TL F 10213
RRD-B30M105 Printed in U S A