IC 7400 SERIES

7447 - BCD to 7-Segment Decoder/Driver with (15V) Open Collector Output

Pin Layout

Features Output Drive Capability - 10 LSTTL Loads Outputs Directly Interface to CMOS, NMOS and TTL Large Operating Voltage Range Low Input Current High Noise Immunity

Pin Description Pin Number Description 1 BCD B Input 2 BCD C Input 3 Lamp Test 4 RB Output 5 RB Input 6 BCD D Input 7 BCD A Input 8 Ground 9 7-Segment e Output 10 7-Segment d Output 11 7-Segment c Output 12 7-Segment b Output 13 7-Segment a Output 14 7-Segment g Output 15 7-Segment f Output 16 Positive Supply

Dimension Drawing

Technical Data Absolute Maximum Ratings Supply Voltage 7V Input Voltage 5.5V Operating Free Air Temperature 0oC to +70oC Storage Temperature Range -65oC to +150oC Recommended Operating Conditions Symbol Parameter Min Nom Max Units Vcc Supply Voltage 4.75 5 5.25 V Vih HIGH Level Input Voltage 2     V Vil LOW Level Input Voltage     0.8 V Ioh HIGH Level Output Current     -0.4 mA Iol LOW Level Output Current     16 mA Ta Free Air Operating Temperature 0   70 oC Electrical Characteristics Symbol Parameter Conditions Min Typ Max Units Vi Input Clamp Voltage Vcc=Min,Ii=-12mA     -1.5 V Voh HIGH Level Output Voltage Vcc=Min,Ioh=MAX,Vil=MAX 2.4 3.4   V Vol LOW Level Output Voltage Vcc=Min,Iol=MAX,Vih=MAX   0.2 0.4 V Ii Input Current@MAX Input Voltage Vcc=Max,Vi=5.5V     1 mA Iih HIGH Level Input Current Vcc=Max,Vi=2.4V     40 uA Iil LOW Level Input Current Vcc=Max,Vi=0.4V     -1.6 mA Ios Short Circuit Output Current Vcc=Max -18   -55 mA Icch Supply Current with Outputs HIGH Vcc=Max   4 8 mA Iccl Supply Current with Outputs LOW Vcc=Max   12 22 mA Switching Characteristics at Vcc=5V,Ta=25oC Symbol Parameter Conditions Min Max Units tplh Propogation Delay Time LOW-to-HIGH Level Output Cl=15pF Rl=400R   22 nS tphl Propogation Delay Time HIGH-to-LOW Level Output   15 nS