7447 BCD to 7-Segment Decoder (Common Anode) (74HC47/74LS47)

Description

74HC47 (BCD to 7-Segment Decoder/Driver) General DescriptionThe 74HC47 is a BCD to 7-segment decoder/driver IC designed to convert a 4-bit Binary Coded Decimal (BCD) input into the correct output signals for driving a 7-segment display. It is commonly used in digital clocks, counters, panel meters, and numeric display circuits. This IC is typically used with common-anode 7-segment displays. Key Features Converts 4-bit BCD input to 7-segment display output Designed for common-anode displays High-speed CMOS logic Low power consumption Suitable for digital display and counting applications Includes control pins for lamp test, blanking, and ripple blanking Main Functions Accepts BCD inputs: A, B, C, D Decodes numbers 0 to 9 Activates the required segment outputs: a, b, c, d, e, f, g Helps reduce wiring complexity in numeric display circuits Applications Digital counters Frequency meters Calculator displays Embedded electronics projects Numeric indicator circuits Industrial control panels Important Note Best suited for common-anode 7-segment displays For proper operation, current-limiting resistors should be used with the display segments Package Type Commonly available in DIP-16 74HC47 – Pin Functions 🧠 BCD Inputs Pin 7 – A: Least Significant Bit (LSB) input Pin 1 – B: BCD input Pin 2 – C: BCD input Pin 6 – D: Most Significant Bit (MSB) input 7-Segment Outputs (Active LOW – for Common Anode) Pin 13 – a: Segment A output Pin 12 – b: Segment B output Pin 11 – c: Segment C output P