Overview
The 74HC138D, produced by Nexperia USA Inc., is a 3-to-8 line decoder/demultiplexer with inverting outputs. This integrated circuit (IC) is part of the 74HC series and is designed to decode three binary weighted address inputs (A0, A1, and A2) into eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1, E2, and E3), allowing for flexible control over the output states. It is widely used in various electronic designs due to its versatility and robust performance characteristics.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Type Number | 74HC138D | Part number |
| Package | SO16 (SOT109-1) | Package type |
| VCC | 2.0 - 6.0 V | Supply voltage range |
| Logic Switching Levels | CMOS | Input logic levels |
| Output Drive Capability | ± 5.2 mA | Output current capability |
| tpd | 12 ns | Propagation delay |
| Power Dissipation | Low power dissipation | Power consumption characteristic |
| Tamb | -40 °C to +125 °C | Operating temperature range |
| ESD Protection | HBM: >2000 V, CDM: >1000 V | Electrostatic discharge protection levels |
Key Features
- Decoding and Demultiplexing Capability: Decodes three binary weighted address inputs to eight mutually exclusive outputs.
- Multiple Enable Inputs: Features three enable inputs (E1, E2, and E3) allowing for easy parallel expansion and demultiplexing.
- Wide Supply Voltage Range: Operates from 2.0 to 6.0 V.
- Low Power Dissipation: CMOS technology ensures low power consumption.
- High Noise Immunity: Robust against noise due to high noise immunity.
- Latch-up Performance: Exceeds 100 mA per JESD 78 Class II Level B.
- ESD Protection: Compliant with ANSI/ESDA/JEDEC JS-001 and JS-002 standards.
- Active LOW Mutually Exclusive Outputs: Outputs are active LOW and mutually exclusive.
Applications
The 74HC138D is versatile and can be used in a variety of applications, including:
- Memory Chip Select Decoding: Ideal for selecting memory chips in digital systems.
- Demultiplexing: Can be used as an eight-output demultiplexer by utilizing one of the enable inputs as the data input.
- Industrial and Automotive Systems: Suitable for use in industrial and automotive applications due to its robust performance and wide operating temperature range.
- Consumer Electronics: Used in various consumer electronic devices requiring decoding and demultiplexing functions.
Q & A
- What is the primary function of the 74HC138D IC?
The primary function of the 74HC138D is to decode three binary weighted address inputs into eight mutually exclusive outputs and to act as a demultiplexer.
- What is the supply voltage range for the 74HC138D?
The supply voltage range for the 74HC138D is from 2.0 to 6.0 V.
- What are the logic switching levels for the 74HC138D?
The logic switching levels for the 74HC138D are CMOS levels.
- How many enable inputs does the 74HC138D have?
The 74HC138D has three enable inputs (E1, E2, and E3).
- What is the propagation delay of the 74HC138D?
The propagation delay of the 74HC138D is 12 ns.
- What is the operating temperature range for the 74HC138D?
The operating temperature range for the 74HC138D is from -40 °C to +125 °C.
- Does the 74HC138D have ESD protection?
Yes, the 74HC138D has ESD protection exceeding 2000 V for HBM and 1000 V for CDM.
- Can the 74HC138D be used as a demultiplexer?
Yes, the 74HC138D can be used as an eight-output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
- What package options are available for the 74HC138D?
The 74HC138D is available in SO16 (SOT109-1) and other package options such as TSSOP and DHVQFN.
- Is the 74HC138D RoHS compliant?
Yes, the 74HC138D is lead-free and RoHS compliant.
