Overview
The CD74HCT138M is a high-speed CMOS logic 3-to-8 line decoder/demultiplexer produced by Harris Corporation. This integrated circuit is part of the 74HCT series and is well-suited for applications such as memory address decoding or data-routing. It features low power consumption and speeds comparable to low-power Schottky TTL logic. The device is available in a 16-pin SOIC package and operates over a wide temperature range of -55°C to 125°C.
Key Specifications
| Product Attribute | Attribute Value |
|---|---|
| Manufacturer | Harris Corporation |
| Series | 74HCT |
| Package / Case | 16-SOIC (0.154" | 3.90mm Width) |
| Mounting Type | Surface Mount |
| Type | Decoder/Demultiplexer |
| Circuit | 1 x 3:8 |
| Independent Circuits | 1 |
| Current - Output High, Low | 4mA, 4mA |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -55°C ~ 125°C |
| Bandwidth | 28 MHz |
| Output Drive (IOL/IOH)(Max) | 4/-4 mA |
| RoHS Status | RoHS non-compliant[Note: Some sources indicate RoHS compliance, but the most accurate source here indicates non-compliance |
Key Features
- High-speed CMOS logic with low power consumption.
- 3-to-8 line decoder/demultiplexer functionality.
- Three binary select inputs (A0, A1, and A2) and two active low and one active high enables (E1, E2, and E3) for cascading decoders.
- Outputs can drive ten low-power Schottky TTL equivalent loads.
- Operating temperature range of -55°C to 125°C.
- Single supply voltage of 4.5V to 5.5V.
Applications
The CD74HCT138M is suitable for various applications, including:
- Memory address decoding.
- Data-routing applications.
- Cascading decoders for more complex logic operations.
- General-purpose decoding and demultiplexing in digital circuits.
Q & A
- What is the primary function of the CD74HCT138M?
The CD74HCT138M functions as a 3-to-8 line decoder/demultiplexer. - What is the operating temperature range of the CD74HCT138M?
The operating temperature range is -55°C to 125°C. - What is the supply voltage range for the CD74HCT138M?
The supply voltage range is 4.5V to 5.5V. - What type of package does the CD74HCT138M come in?
The CD74HCT138M comes in a 16-pin SOIC package. - Is the CD74HCT138M RoHS compliant?
No, the CD74HCT138M is not RoHS compliant according to the most accurate source. - What is the bandwidth of the CD74HCT138M?
The bandwidth is 28 MHz. - How many outputs can be driven by the CD74HCT138M?
The outputs can drive ten low-power Schottky TTL equivalent loads. - What are the typical applications of the CD74HCT138M?
Typical applications include memory address decoding, data-routing, and cascading decoders. - Is the CD74HCT138M still in production?
No, the CD74HCT138M is listed as obsolete. - What are the enable inputs for the CD74HCT138M?
The device has two active low and one active high enables (E1, E2, and E3).
