Overview
The CD74HCT238PWR is a high-speed silicon gate CMOS decoder/demultiplexer produced by Texas Instruments. This component is part of the HC and HCT series, which are well-suited for memory address decoding or data-routing applications. It features three binary select inputs (A0, A1, and A2) and three enable inputs (G0, G1, and G2) to simplify cascading and demultiplexing functions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 4.5 to 5.5 | V |
| Input Voltage Range | 0 to VCC | V |
| Output Voltage Range | 0 to VCC | V |
| Temperature Range | -55 to 125 | °C |
| Propagation Delay (Address to Output) | 35 to 53 ns (CL = 50 pF) | ns |
| Propagation Delay (Strobe to Output) | 40 to 60 ns (CL = 15 pF) | ns |
| Output Transition Time | 15 to 22 ns (CL = 15 pF) | ns |
| Input Capacitance | 10 pF | pF |
| Power Dissipation Capacitance | 67 pF (CL = 15 pF) | pF |
| Package Type | TSSOP (16 pins) | |
| Body Size | 5.00 mm × 4.40 mm | mm |
Key Features
- Select one of eight data outputs: active high for '238.
- Three enable inputs (G0, G1, and G2) to simplify cascading and demultiplexing.
- Typical propagation delay of 13 ns at VCC = 5 V, CL = 15 pF, TA = 25°C.
- Fanout: 10 LSTTL loads for standard outputs and 15 LSTTL loads for bus driver outputs.
- 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: VIL = 0.8 V (Max), VIH = 2 V (Min).
- CMOS input compatibility: Il ≤ 1µA at VOL, VOH.
Applications
The CD74HCT238PWR is suitable for various applications including memory address decoding, data routing, and demultiplexing. It is particularly useful in systems where high speed and low power consumption are critical, such as in digital logic circuits, microprocessor systems, and other electronic devices that require efficient data handling.
Q & A
- What is the primary function of the CD74HCT238PWR? The primary function is to act as a 3-to-8 decoder/demultiplexer.
- What are the input voltage ranges for this component? The input voltage range is from 0 to VCC.
- What is the operating temperature range of the CD74HCT238PWR? The operating temperature range is from -55°C to 125°C.
- How many enable inputs does the CD74HCT238PWR have? It has three enable inputs (G0, G1, and G2).
- What is the typical propagation delay of the CD74HCT238PWR? The typical propagation delay is 13 ns at VCC = 5 V, CL = 15 pF, TA = 25°C.
- What type of package does the CD74HCT238PWR come in? It comes in a TSSOP (16 pins) package.
- What is the body size of the TSSOP package? The body size is 5.00 mm × 4.40 mm.
- Does the CD74HCT238PWR have LSTTL input logic compatibility? Yes, it has direct LSTTL input logic compatibility.
- What is the fanout capability of the CD74HCT238PWR? It can drive 10 LSTTL loads for standard outputs and 15 LSTTL loads for bus driver outputs.
- Is the CD74HCT238PWR RoHS compliant? Yes, it is RoHS compliant.
