74148 is an 8 data line to 3 line decoder IC. This IC ensures that only the highest priority or order data is encoded. The device has an inbuilt cascading circuit when input EI and output EO are enabled which allows for octal expansion without external cascading circuit.

Specification:

• Voltage supply: 4.5V to 5.5V.
• Current supply: 40mA to 60mA.
• High-level input voltage: 2V.
• Low-level input voltage: 0.8V.
• High-level output voltage: 2.V to 3.3V.
• Low level output voltage: 0.2V to 0.4V.

Pin Description:

Pin	Symbol	Description
1	4	decimal data input (active low)
2	5	decimal data input (active low)
3	6	decimal data input (active low)
4	7	decimal data input (active low)
5	EI	enable input (active low)
6	A2	binary address output (active low)
7	A1	BCD address output (active low)
8	GND	ground
9	A0	binary address output (active low)
10	0	decimal data input (active low)
11	1	decimal data input (active low)
12	2	decimal data input (active low)
13	3	decimal data input (active low)
14	GS	goes low when EI is low and any input is low
15	EO	goes high when EI is low and any input is low (EO = GS)
16	Vcc	supply voltage

 

Application:

• N-bit encoding
• Code converters and generators

Instructions:

• All the technical values are given at V=5V and T=25℃
• More than one output should not be sorted at a time