Overview
The CD74HC238M96G4 is a high-speed silicon gate CMOS decoder/demultiplexer produced by Texas Instruments. This component is part of the 74HC series and is well-suited for memory address decoding or data routing applications. It functions as a 3-to-8 decoder, allowing the selection of one of eight data outputs based on three address select inputs (A2, A1, and A0).
The device features three enable inputs (G2, G1, and G0) that simplify cascading and facilitate demultiplexing. When any of these strobe inputs are active, all outputs are forced into the low state, making it ideal for various digital logic applications.
Key Specifications
| Parameter | Condition | Unit | Min | Max | |
|---|---|---|---|---|---|
| VCC Operating Voltage | V | 2 | 6 | ||
| Propagation Delay (Address to Output) | CL = 50pF, VCC = 5V, TA = 25°C | ns | 13 | 19 | |
| Propagation Delay (Strobe to Output) | CL = 50pF, VCC = 5V, TA = 25°C | ns | 26 | 38 | |
| Output Transition Time | CL = 50pF, VCC = 5V, TA = 25°C | ns | 15 | 22 | |
| Input Capacitance | pF | 10 | 10 | ||
| Power Dissipation Capacitance | CL = 15pF | pF | 5 | 67 | |
| Operating Temperature Range | °C | -55 | 125 | ||
| Package Type | SOIC (16) | ||||
| Package Dimensions | mm | 9.90 x 3.90 |
Key Features
- Select one of eight data outputs: Active high for '238.
- Three enable inputs (G2, G1, and G0) to simplify cascading and facilitate demultiplexing.
- Typical propagation delay of 13 ns at VCC = 5 V, CL = 15 pF, TA = 25°C.
- Fanout: Bus driver outputs support 15 LSTTL loads, standard outputs support 10 LSTTL loads.
- Wide operating temperature range: -55°C to 125°C.
- Balanced propagation delay and transition times.
- Significant power reduction compared to LSTTL logic ICs.
- HC types: 2 V to 6 V operation, high noise immunity (NIL = 30%, NIH = 30% of VCC at VCC = 5 V).
- HCT types: 4.5-V to 5.5-V operation, direct LSTTL input logic compatibility.
Applications
- Memory address decoding.
- Data routing applications.
- I/O port or memory selector.
- Digital logic circuits requiring demultiplexing functions.
- General-purpose decoding in digital systems.
Q & A
- What is the primary function of the CD74HC238M96G4?
The primary function is to act as a 3-to-8 decoder/demultiplexer, allowing the selection of one of eight data outputs based on three address select inputs.
- What are the operating voltage ranges for the CD74HC238M96G4?
The operating voltage range is from 2 V to 6 V.
- What is the typical propagation delay of the CD74HC238M96G4?
The typical propagation delay is 13 ns at VCC = 5 V, CL = 15 pF, and TA = 25°C.
- How many enable inputs does the CD74HC238M96G4 have?
The device has three enable inputs (G2, G1, and G0).
- What is the fanout capability of the CD74HC238M96G4?
The bus driver outputs support 15 LSTTL loads, and standard outputs support 10 LSTTL loads.
- What is the operating temperature range of the CD74HC238M96G4?
The operating temperature range is from -55°C to 125°C.
- What package types are available for the CD74HC238M96G4?
The device is available in SOIC (16) and other package types such as PDIP, TSSOP, and CDIP.
- What are the dimensions of the SOIC package for the CD74HC238M96G4?
The SOIC package dimensions are 9.90 mm x 3.90 mm.
- What are some common applications of the CD74HC238M96G4?
Common applications include memory address decoding, data routing, I/O port or memory selection, and general-purpose decoding in digital systems.
- Does the CD74HC238M96G4 have high noise immunity?
Yes, the HC types have high noise immunity with NIL = 30% and NIH = 30% of VCC at VCC = 5 V.
