Overview
The CD74HC238PWT is a high-performance, silicon-gate CMOS integrated circuit from Texas Instruments, functioning as a 3-to-8 line decoder or demultiplexer. It is part of the high-speed CMOS logic family, known for its robust operation and compatibility with a wide range of applications. This device is designed to decode binary information to select one of eight output lines, making it ideal for various multiplexing and data-routing applications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC (Supply Voltage) | 2.0 | 5.0 | 6.0 | V | |
| VI (Input Voltage) | 0 | VCC | V | ||
| VO (Output Voltage) | 0 | VCC | V | ||
| Tamb (Ambient Temperature) | -40 | 125 | °C | ||
| tt (Input Rise and Fall Time) | VCC = 2V | 1000 | ns | ||
| VCC = 4.5V | 500 | ns | |||
| VCC = 6V | 400 | ns | |||
| tpd (Address to Output Delay) | CL = 50pF, VCC = 4.5V | 35 | 53 | ns | |
| Ci (Input Capacitance) | 10 | pF |
Key Features
- 3-to-8 line decoder or demultiplexer functionality, decoding three binary weighted address inputs (A0, A1, and A2) to eight mutually exclusive outputs (Y0 to Y7).
- Operates over a broad voltage range of 2V to 6V, making it versatile for various applications.
- Features two active-low enable inputs (E1, E2) and one active-high enable input (E3) for proper logical state control.
- Balanced propagation delay and transition times, ensuring reliable and predictable system timing.
- Significant power reduction compared to LSTTL logic ICs, suitable for power-sensitive applications.
- Available in a TSSOP (Thin Shrink Small Outline Package) with 16 pins, suitable for surface-mount technology and space-constrained applications.
Applications
- Memory address decoding or data routing applications.
- High-speed data processing systems.
- Computer systems.
- Control systems.
- Multiplexing and demultiplexing functions in various digital circuits.
Q & A
- What is the primary function of the CD74HC238PWT?
The CD74HC238PWT functions as a 3-to-8 line decoder or demultiplexer, decoding three binary weighted address inputs to eight mutually exclusive outputs.
- What is the voltage range for the CD74HC238PWT?
The device operates over a voltage range of 2V to 6V.
- What types of enable inputs does the CD74HC238PWT have?
The device has two active-low enable inputs (E1, E2) and one active-high enable input (E3).
- What is the significance of balanced propagation delay and transition times in the CD74HC238PWT?
It ensures reliable and predictable system timing, which is crucial for high-speed operations.
- What is the package type of the CD74HC238PWT?
The device is available in a TSSOP (Thin Shrink Small Outline Package) with 16 pins.
- What are some common applications of the CD74HC238PWT?
It is used in memory address decoding, data routing, high-speed data processing systems, computer systems, and control systems.
- How does the CD74HC238PWT handle power consumption?
The device offers significant power reduction compared to LSTTL logic ICs, making it suitable for power-sensitive applications.
- What is the input capacitance of the CD74HC238PWT?
The input capacitance is 10 pF.
- What is the ambient temperature range for the CD74HC238PWT?
The device operates within an ambient temperature range of -40°C to 125°C.
- Is the CD74HC238PWT still in production?
No, the CD74HC238PWT is no longer in production. New designs should consider an alternate product.
