3-Line To 8-Line Decoders/Demultiplexers The SN74HC138N is a 3-to-8 line decoder/demultiplexer manufactured by Texas Instruments. Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:
### **Specifications:**
- **Manufacturer:** Texas Instruments
- **Type:** Decoder/Demultiplexer
- **Logic Family:** HC (High-Speed CMOS)
- **Number of Input Lines:** 3 (A0, A1, A2)
- **Number of Output Lines:** 8 (Y0 to Y7, active-low)
- **Supply Voltage Range:** 2V to 6V
- **Operating Temperature Range:** -40°C to +85°C
- **Propagation Delay:** Typically 13 ns at 5V
- **Input Current (Max):** ±1 µA
- **Output Current (Max):** ±5.2 mA
- **Package Type:** PDIP (Plastic Dual In-Line Package)
- **Pin Count:** 16
### **Descriptions:**
The SN74HC138N is designed to accept three binary-weighted inputs (A0, A1, A2) and decode them into eight mutually exclusive outputs (Y0 to Y7). It features three enable inputs (two active-low: E1, E2; one active-high: E3) to simplify cascading and reduce the need for external gates.
### **Features:**
- **3-to-8 Line Decoding:** Converts 3 binary inputs into one of eight active-low outputs.
- **Demultiplexing Capability:** Can be used as a 1-of-8 demultiplexer with the address inputs acting as selection lines.
- **Low Power Consumption:** CMOS technology ensures minimal power dissipation.
- **High Noise Immunity:** Typical of HC logic family.
- **Wide Operating Voltage:** Supports 2V to 6V, making it compatible with TTL levels.
- **Fast Switching Speed:** Propagation delay of 13 ns at 5V.
- **Enable Inputs:** Allows for easy expansion to larger decoding configurations.
This information is strictly based on the manufacturer's datasheet and technical documentation.
