74HC47 ( BCD to 7-Segment Decoder)

Description

74HC47 (BCD to 7-Segment Decoder/Driver) General Description The 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 Pin 10 – d : Segment D output Pin 9 – e : Segment E output Pin 15 – f : Segment F output Pin 14 – g : Segment G output Control Pins Pin 3 – LT (Lamp Test) : Forces all segments ON when LOW Pin 4 – BI (Blanking Input) : Turns OFF all segments when LOW Pin 5 – RBI (Ripple Blanking Input) : Used for leading zero suppression Power Pins Pin 16 – VCC : +5V Supply Pin 8 – GND : Ground

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