Overview
The 74HC238D is a high-speed CMOS 3-to-8 line decoder/demultiplexer fabricated with silicon gate C2MOS technology. It is designed to achieve high-speed operation similar to equivalent LSTTL while maintaining the low power dissipation characteristic of CMOS devices. This component is produced by Toshiba Semiconductor and Storage and is widely used in various digital circuits for decoding and demultiplexing applications.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Supply Voltage (VCC) | 2.0 to 6.0 | V | Operating Range |
| Input Voltage (VIN) | 0 to VCC | V | Operating Range |
| Output Voltage (VOUT) | 0 to VCC | V | Operating Range |
| Operating Temperature (Topr) | -40 to 125 | °C | Operating Range |
| Propagation Delay Time (tpd) | 14 ns (typ.) at VCC = 5 V | ns | Typical Value |
| Power Dissipation (ICC) | 4.0 µA (max) at Ta = 25 °C | µA | Maximum Value |
| Output Drive Capability | ± 5.2 mA | mA | |
| Package Type | SOIC16 |
Key Features
- High Speed: The 74HC238D operates with a propagation delay time of 14 ns (typical) at VCC = 5 V, making it suitable for high-speed applications.
- Low Power Dissipation: It features low power consumption with an ICC of 4.0 µA (maximum) at Ta = 25 °C.
- Wide Operating Voltage Range: The device can operate over a wide supply voltage range from 2.0 V to 6.0 V.
- Balanced Propagation Delays: The propagation delays for both rising and falling edges are balanced, ensuring consistent performance.
- Multiple Enable Inputs: The device includes three enable inputs (G1, G2A, and G2B) which allow for easy cascade connection and use as an address decoder for memory systems.
- ESD Protection: The component includes ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V.
- High Noise Immunity: It complies with JEDEC standards and has high noise immunity, making it reliable in noisy environments.
Applications
- Memory Systems: The 74HC238D is ideal for use as an address decoder in memory systems due to its multiple enable inputs and high-speed operation.
- Demultiplexing: It can be used as an eight-output demultiplexer by utilizing one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
- Digital Circuits: The component is suitable for various digital circuits requiring decoding and demultiplexing functions, such as in communication systems, data processing, and control systems.
Q & A
- What is the primary function of the 74HC238D?
The primary function of the 74HC238D is to act as a 3-to-8 line decoder/demultiplexer, decoding three binary weighted address inputs to eight mutually exclusive outputs.
- What is the operating voltage range of the 74HC238D?
The operating voltage range of the 74HC238D is from 2.0 V to 6.0 V.
- What is the typical propagation delay time of the 74HC238D at VCC = 5 V?
The typical propagation delay time is 14 ns at VCC = 5 V.
- What kind of ESD protection does the 74HC238D have?
The 74HC238D has ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V.
- What package type is the 74HC238D available in?
The 74HC238D is available in a SOIC16 package.
- What is the operating temperature range of the 74HC238D?
The operating temperature range is from -40 °C to 125 °C.
- Can the 74HC238D be used as a demultiplexer?
Yes, the 74HC238D 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 are the key applications of the 74HC238D?
The key applications include use in memory systems as an address decoder and in various digital circuits requiring decoding and demultiplexing functions.
- Does the 74HC238D have balanced propagation delays?
Yes, the 74HC238D has balanced propagation delays for both rising and falling edges.
- Is the 74HC238D compliant with JEDEC standards?
Yes, the 74HC238D complies with JEDEC standards such as JESD8C and JESD7A.
