Overview
The 74HC139D is a dual 2-to-4 line decoder/demultiplexer integrated circuit produced by Toshiba Semiconductor and Storage, although it is now obsolete and no longer manufactured. This component is part of the 74HC/HCT family and is designed to decode two binary weighted address inputs to four mutually exclusive outputs. It features an enable input that can force all outputs to a high state when activated, and it also supports demultiplexing applications.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Type Number | 74HC139D | Dual 2-to-4 line decoder/demultiplexer |
| VCC (V) | 2.0 - 6.0 | Operating voltage range |
| Logic Switching Levels | CMOS | Logic level compatibility |
| Output Drive Capability (mA) | ± 5.2 | Maximum output current |
| tpd (ns) | 14 | Propagation delay time |
| Tamb (°C) | -40 to +125 | Operating temperature range |
| Package | SO16 (SOT109-1) | Package type and dimensions |
| ESD Protection | HBM: >2000 V, CDM: >1000 V | Electrostatic discharge protection levels |
Key Features
- Dual 2-to-4 line decoder/demultiplexer functionality.
- Each decoder features an enable input (nE) that can force all outputs to a high state when activated.
- Supports demultiplexing applications where the enable input can be used as the data input for a 1-to-4 demultiplexer.
- Inputs include clamp diodes, enabling the use of current limiting resistors to interface inputs to voltages in excess of VCC.
- Active LOW mutually exclusive outputs.
- Complies with JEDEC standard no. 7A.
- ESD protection: HBM (Human Body Model) exceeds 2000 V and CDM (Charged Device Model) exceeds 1000 V.
Applications
- Memory decoding: Suitable for decoding memory addresses in digital systems.
- Data routing: Can be used in data routing applications to direct data to specific paths.
- Code conversion: Useful in converting binary codes to other forms.
- General logic circuits: Can be integrated into various logic circuits requiring decoding and demultiplexing functions.
Q & A
- What is the primary function of the 74HC139D IC?
The primary function of the 74HC139D is to act as a dual 2-to-4 line decoder/demultiplexer.
- What are the operating voltage ranges for the 74HC139D?
The operating voltage range for the 74HC139D is 2.0 to 6.0 volts.
- What logic level compatibility does the 74HC139D have?
The 74HC139D is compatible with CMOS logic levels.
- What is the propagation delay time of the 74HC139D?
The propagation delay time of the 74HC139D is approximately 14 nanoseconds.
- What is the operating temperature range for the 74HC139D?
The operating temperature range for the 74HC139D is from -40°C to +125°C.
- What type of package does the 74HC139D come in?
The 74HC139D comes in a SO16 (SOT109-1) package.
- Does the 74HC139D have ESD protection?
- Can the 74HC139D be used for demultiplexing applications?
- Is the 74HC139D still in production?
No, the 74HC139D is obsolete and no longer manufactured.
- What are some common applications of the 74HC139D?
