Overview
The 74HC138PW is a 3-to-8 line decoder/demultiplexer produced by Nexperia USA Inc. This integrated circuit decodes three binary weighted address inputs (A0, A1, and A2) to eight mutually exclusive outputs (Y0 to Y7). It features three enable inputs (E1, E2, and E3), allowing for flexible control over the output states. The device can be used both as a decoder and as an eight-output demultiplexer, making it versatile for various digital circuit applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC (Supply Voltage) | 2.0 to 6.0 | V |
| Logic Switching Levels | CMOS (for 74HC138), TTL (for 74HCT138) | - |
| Output Drive Capability | ± 5.2 | mA |
| tpd (Propagation Delay) | 12 to 38 | ns |
| Power Dissipation | Low power dissipation | - |
| Operating Temperature Range | -40 to +125 | °C |
| Package Type | TSSOP16 (SOT403-1) | - |
| ESD Protection | HBM: >2000 V, CDM: >1000 V | - |
Key Features
- Wide Supply Voltage Range: Operates from 2.0 to 6.0 V.
- Low Power Dissipation: CMOS technology ensures low power consumption.
- High Noise Immunity: Robust against noise and interference.
- Latch-up Performance: Exceeds 100 mA per JESD 78 Class II Level B.
- Demultiplexing Capability: Can be used as an eight-output demultiplexer.
- Multiple Input Enable: Allows easy parallel expansion to a 1-of-32 decoder.
- Input Clamp Diodes: Enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
Applications
- Memory Chip Select Decoding: Ideal for selecting memory chips in digital systems.
- Digital Circuit Design: Useful in various digital circuit applications requiring decoding and demultiplexing functions.
- Automotive and Industrial Systems: Suitable for use in automotive and industrial environments due to its robustness and reliability.
- Consumer Electronics: Can be used in consumer electronic devices requiring efficient and reliable digital logic functions.
Q & A
- What is the primary function of the 74HC138PW?
The primary function of the 74HC138PW is to decode three binary weighted address inputs to eight mutually exclusive outputs, and it can also be used as an eight-output demultiplexer.
- What is the supply voltage range for the 74HC138PW?
The supply voltage range for the 74HC138PW is from 2.0 to 6.0 V.
- What are the logic switching levels for the 74HC138PW?
The logic switching levels for the 74HC138PW are CMOS, while the 74HCT138 version uses TTL levels.
- What is the propagation delay of the 74HC138PW?
The propagation delay of the 74HC138PW ranges from 12 to 38 ns depending on the supply voltage and operating conditions.
- What is the operating temperature range for the 74HC138PW?
The operating temperature range for the 74HC138PW is from -40 to +125 °C.
- What type of package is the 74HC138PW available in?
The 74HC138PW is available in a TSSOP16 (SOT403-1) package.
- Does the 74HC138PW have ESD protection?
Yes, the 74HC138PW has ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V.
- How can the 74HC138PW be used for demultiplexing?
The 74HC138PW 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 some common applications of the 74HC138PW?
The 74HC138PW is commonly used in memory chip select decoding, digital circuit design, automotive and industrial systems, and consumer electronics.
- Can the 74HC138PW be expanded for more outputs?
Yes, the 74HC138PW can be expanded to a 1-of-32 decoder using four '138 ICs and one inverter.
