Seven-Segment LED Display

Common Anode (CA)

Requires an active low-output driver/decoder, such as IC 7447
When using a common anode LED, the common anode should to be connected to the power supply (VCC);
ใน Logic Works คือ 7-Seg Inverse

Requires an active high-output driver/decoder, such as IC 7448
when using a common cathode LED, the common cathode should be connected to the ground (GND).
ใน Logic Works คือ 7-Seg ปกติ

The 7447 takes 4 binary inputs that represent a Binary-Coded Decimal (BCD) value (ranging from 0000 to 1001, which corresponds to the decimal numbers 0 to 9). It then drives the segments of a 7-segment display to visually represent these numbers.
7447: BCD to 7-segment decoder/driver designed for common-anode displays (the segments light up when their cathodes are pulled low).
Take active high inputs

7448: BCD to 7-segment decoder/driver designed for common-cathode displays (the segments light up when their anodes are pulled high).
Take active high inputs

The 74147 is a priority encoder IC with 10-line to 4-line functionality.
It takes 10 active-low inputs (from 0 to 9) and encodes the highest-priority active input
- into a active low 4-bit binary code outputs.
  Key points about the 74147:
It has 10 inputs (labeled from 0 to 9), each corresponding to a decimal digit.
The inputs are active-low, meaning a '0' (low signal) indicates that the line is selected.
It provides a 4-bit binary output corresponding to the highest-priority input that is active. If multiple inputs are low, it prioritizes the highest number.
For example:
If both inputs 3 and 6 are active (low), the output will be the binary encoding of 6, because it has a higher priority.
Input 9 has the highest priority, and input 0 has the lowest priority.
สรุปง่าย ๆ คือเข้าใจ 100% แล้ว
74147 produces active low output แต่ 7447/7448 มันต้องการ active high input เลยต้องใส่ NOT ก่อน แล้วคือ ตอนเลือก 7-seg ใน Logic Works อย่าลืมดูด้วยว่ามันเป็น Common Anode/Common Cathode นะจ๊ะ
- มัน Receive Active Low input ด้วยนะ