7447 BCD to 7-Segment Decoders/Drivers Common Anode 5V 24mA IC DIP-16

7447 BCD to 7-Segment Decoders/Drivers Common Anode 5V 24mA IC DIP-16 The 7447 (SN74LS47) is a TTL-based BCD to 7-segment decoder/driver designed to interface digital systems with common anode LED displays. It converts 4-bit binary-coded decimal (BCD) inputs into the corresponding 7-segment output signals, allowing easy display of decimal numbers (0–9). The IC features open-collector outputs capable of directly driving LED segments with high current sinking capability. This device includes built-in functions such as lamp test, ripple blanking, and input blanking, making it highly versatile for display systems. It is widely used in digital clocks, counters, calculators, and embedded systems where numeric display is required. Its robust design ensures reliable operation in standard TTL logic environments. Features BCD to 7-segment decoding (0–9). Designed for common anode displays. Open-collector outputs for direct LED driving. High current sinking capability (up to 24mA per segment). Built-in lamp test (LT) function. Ripple blanking input/output (RBI/RBO) for leading zero suppression. Blanking input (BI) for display control and brightness modulation. TTL compatible inputs. Specifications: Parameter Value Unit Supply voltage 4.75 to 5.25 V Operating ambient temperature 0 to 70 °C Output off‑state voltage (a‑g) 15 V On‑state output current (a‑g) 24 mA Output LOW current (BI/RBO) 3.2 mA Output HIGH current (BI/RBO) -50 µA High‑level input current (1 U.L.) 40 µA Low‑level input current (1 U.L.) 1.6 mA Output LOW drive factor 15 U.L. Pinout: Pin No. Name 1 B 2 C 3 LT 4 BI/RBO 5 RBI 6 D 7 A 8 GND 9 e 10 d 11 c 12 b 13 a 14 g 15 f 16 V Package Included: 1x 7447 BCD to 7-Segment Decoders/Drivers Common Anode 5V 24mA IC DIP-16. Documents: 7447 Datasheet.

7447 IC BCD to 7-Segment Decoders/Drivers Common Anode 7447 BCD to 7-Segment Decoder/Driver Datasheet Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions. All of the circuits incorporate automatic leading and/or trailing-edge, zero-blanking control (RBI and RBO). Lamp test (LT) of these devices may be performed at any time when the BI/RBO node is at a high logic level. All types contain an overriding blanking input (BI) which can be used to control the lamp intensity (by pulsing) or to inhibit the outputs. Features All circuit types feature lamp intensity modulation capability Open-collector outputs drive indicators directly Lamp-test provision Leading/trailing zero suppression Pin Layout 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 Vcc – Positive Supply Dimensional Drawing Technical Data Absolute Maximum Ratings Supply Voltage 7V Input Voltage 5.5V Operating Free Air Temperature 0°C to 70°C Storage Temperature Range -65°C to 150°C Recommended Operating Conditions Symbol Parameter Min Typ Max Units Vcc Supply Votage 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 °C 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 µA 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=25°C Symbol Parameter Conditions Min Typ Max Units tplh Propagation Delay Time LOW-to-HIGH Level Output Cl=15pF Rl=400R 22 nS tphl Propagation Delay Time HIGH-to-LOW Level Output Cl=15pF Rl=400R 15 nS