74LS147 Decimal to BCD Priority Encoder IC (74147) DIP 16 Package

74LS147 Decimal to BCD Priority Encoder IC (74147) DIP 16 Package

The 74LS147 is a Decimal-to-BCD (Binary Coded Decimal) Priority Encoder from the 74LS TTL logic family.
It converts 10 active LOW decimal inputs (0–9) into a 4-bit active LOW BCD output (8-4-2-1).

This IC also provides priority encoding, meaning if multiple inputs are active simultaneously, the highest-priority (highest number) input is encoded in the output.
All outputs are active LOW, which makes it compatible with other TTL logic and commonly used active-LOW input devices such as keypads and switches.

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Specifications:-

Functional Description

• Inputs I0–I9 are active LOW; an input is considered active when it’s LOW.
• Outputs A0–A3 represent the binary code of the highest active input.
• The Enable Input (EI) must be LOW for the device to operate; if HIGH, all outputs remain HIGH.
• Group Select (GS) and Enable Output (EO) signals are used for cascading multiple encoders.

Applications

• Decimal to BCD conversion
• Keyboard and keypad encoding
• Digital data entry systems
• Microcontroller input expansion
• Priority logic circuits
• Interrupt request (IRQ) prioritization
• Multiplexed display systems

74ls147-ic-datasheet