This device is formed by a circuit that converts Binary-Coded-Decimal into a 1-of-10 output. The same device can be used to convert a 8-bit code into a 1-of-8 output.

 

Functional Diagram or/and Package:

 

 

Pin Names:

Vdd - Positive Supply Voltage (3V to 15V)

Vss - Ground

A, B, C, D - BCD Inputs

0, 1, 2, 3, 4, 5, 6, 7, 8, 9 - Decimal Outputs
Truth Table

 

Operation Mode:

a) BCD to 1-of-10

BCD codes are applied to the A, B, C, and D inputs. The least significant bit is applied to A and the most significant to D.
The output that goes to the “'1” logic level depends on the input (see the truth table).
An invalid state depends on the origin of the chip (manufacturer).

b) 1-of-8 decoder

The input D is grounded.
The logic signals to be decoded are applied to inputs A, B, and C.
The output depends on the logic levels applied to the input (see the truth table).
Electrical Characteristics

 

 

Applications:

Code Conversion

Address Deooding - Memory Controls

Driver for Displays (tubes)

 

Observations:

Outputs can be relabeled for other codes.

 

 

Datasheets


N° of component