IC 74138 (3-to-8 line decoder/demultiplexer)
BD 1.800
The IC 74LS138 is a 3 to 8 line decoder integrated circuit from the 74xx family of transistor-transistor-logic-gates. The main function of this IC is to decode otherwise demultiplex the applications. The setup of this IC is accessible with 3-inputs to 8-output setup. This IC is mainly used in applications like memory decoding with high performance otherwise data routing, etc. These ICs can be used for minimizing the system decoding effects in memory systems with high performance. This IC includes three enable pins (where two pins are active low and one is active high) decreases the necessity of outside gates. The implementation of 24 line decoder can be done without using outside inverters, as well as a 32-line decoder needs a single inverter
IC 74138 Pin Diagram
As you see in the below pin diagram, the IC 74LS138 has a total of sixteen pins.
1. The pin no. 8 and 16 are the ground and Vcc respectively for the power input.
2. There are a total of three input pins(pin no. 1, 2, 3). They are denoted by A0, A1, A2. So the IC 74LS138 can take three binary input signals.
3. There are three enable input pins E1, E2, E3(pin no. 4, 5, 6). E1 and E2 are the active LOW pins that mean when low signals are applied to those pins they will be active.
4. Pin no. 7 and 9 to 15 are the output pins.
Logical Diagram of IC 74138
The logical circuit of the IC 74138 is made using NOT Gate, and AND Gates. You can see the circuit diagram in the below figure.
Choose Quantity
Product Details
IC 74138 Truth Table
Here the truth table of IC 74138 is given below.
Operating Condition of IC SN74LS138
IC 74138 Applications
1. The supply voltage or Vcc should be given between 4.75V to 5.25V
2. Operating temperature range should be between 0 to 70-degree centigrade
Features of IC 74138
1. It is very fast and high-speed IC.
2. It consumes very low power because it consists of low power Schottky diodes.
3. It has a demultiplexing facility.
4. It has a very short propagation delay.
5. Appropriate operating Temperature.