Overview
The CD74HCT238M96 is a high-speed CMOS logic 3-to-8 line decoder/demultiplexer produced by Texas Instruments. This component is part of the CD74HCT series, which is known for its compatibility with TTL (Transistor-Transistor Logic) inputs and its operation within a voltage range of 4.5 to 5.5 volts. The device is packaged in a 16-pin SOIC (Small Outline Integrated Circuit) package, making it suitable for a variety of applications requiring compact and efficient logic decoding.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | - |
| Pins | 16 | - |
| Operating Temperature Range | -55 to 125 | °C |
| Supply Voltage Range (HCT types) | 4.5 to 5.5 | V |
| Input Voltage Range | 0 to VCC | V |
| Output Voltage Range | 0 to VCC | V |
| Typical Propagation Delay (CL = 15 pF, VCC = 5 V, TA = 25°C) | 13 ns | ns |
| Fanout (over temperature range) | 10 LSTTL loads | - |
| Input Capacitance | 10 pF | pF |
| Power Dissipation Capacitance (CL = 15 pF) | 67 pF | pF |
Key Features
- Select one of eight data outputs with active high logic for the '238 function.
- Three enable inputs (G2, G1, and G0) to simplify cascading and facilitate demultiplexing.
- Wide operating temperature range: -55°C to 125°C.
- High noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5 V.
- Direct LSTTL input logic compatibility with VIL = 0.8 V (Max) and VIH = 2 V (Min).
- CMOS input compatibility with Il ≤ 1µA at VOL, VOH.
- Significant power reduction compared to LSTTL logic ICs.
- Balanced propagation delay and transition times.
Applications
- Memory address decoding.
- Data routing applications.
- I/O port or memory selector functions.
- Demultiplexing applications where data needs to be routed to one of several outputs based on select inputs.
Q & A
- What is the CD74HCT238M96 used for?
The CD74HCT238M96 is used as a 3-to-8 line decoder/demultiplexer, suitable for applications such as memory address decoding, data routing, and demultiplexing.
- What is the operating voltage range of the CD74HCT238M96?
The operating voltage range for the CD74HCT238M96 is 4.5 to 5.5 volts.
- What is the typical propagation delay of the CD74HCT238M96?
The typical propagation delay is 13 ns at VCC = 5 V, CL = 15 pF, and TA = 25°C.
- What is the fanout capability of the CD74HCT238M96?
The fanout capability is up to 10 LSTTL loads over the temperature range.
- What are the enable inputs used for in the CD74HCT238M96?
The three enable inputs (G2, G1, and G0) are used to simplify cascading and facilitate demultiplexing.
- What is the operating temperature range of the CD74HCT238M96?
The operating temperature range is -55°C to 125°C.
- Is the CD74HCT238M96 compatible with TTL inputs?
- What is the package type of the CD74HCT238M96?
The CD74HCT238M96 is packaged in a 16-pin SOIC (D) package.
- How does the demultiplexing function work in the CD74HCT238M96?
The demultiplexing function is accomplished by using the select inputs to choose the desired output and then using one of the strobe inputs as the data input.
- What are the typical applications of the CD74HCT238M96?
Typical applications include memory address decoding, data routing, and I/O port or memory selector functions.
