Overview
The 74HC138DB118, produced by NXP USA Inc., is a high-performance CMOS 3-to-8 line decoder/demultiplexer. This device is designed to decode a three-bit binary weighted address to one of eight active-low outputs. It is widely used in various digital circuits for decoding and demultiplexing applications.
Key Specifications
| Parameter | 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 | 25 | 125 | °C |
| VIH HIGH-level Input Voltage (VCC = 6.0V) | 4.2 | 3.2 | - | V |
| VIL LOW-level Input Voltage (VCC = 6.0V) | - | 2.8 | 1.8 | V |
| tpd Propagation Delay (VCC = 5V, CL = 15pF) | - | 12 | - | ns |
Key Features
- Decodes three binary weighted address inputs (A0, A1, A2) to eight mutually exclusive outputs (Y0 to Y7).
- Features three enable inputs (E1, E2, and E3) with two active-low and one active-high enable input.
- Wide supply voltage range from 2.0V to 6.0V.
- CMOS low power consumption.
- Schmitt Trigger action at all inputs.
- ESD protection tested per JESD 22, exceeding 200-V Machine Model and 2000-V Human Body Model.
- Output drive capability: 10 LSTTL loads.
- Inputs accept up to 6.0V.
Applications
- Decoding and demultiplexing in digital circuits.
- Parallel expansion to create higher-order decoders (e.g., 1-of-32 lines with four '138 ICs and one inverter).
- Use in automotive, industrial, and consumer electronics where decoding and demultiplexing functions are required.
- Integration into microcontroller and microprocessor systems for address decoding and data routing.
Q & A
- What is the primary function of the 74HC138DB118?
The primary function is to decode a three-bit binary weighted address to one of eight active-low outputs and to act as a demultiplexer.
- What is the supply voltage range for the 74HC138DB118?
The supply voltage range is from 2.0V to 6.0V.
- How many enable inputs does the 74HC138DB118 have?
The device has three enable inputs: two active-low (E1, E2) and one active-high (E3).
- What is the propagation delay of the 74HC138DB118 at VCC = 5V and CL = 15pF?
The propagation delay is approximately 12 ns.
- Is the 74HC138DB118 ESD protected?
Yes, it is ESD protected, exceeding 200-V Machine Model and 2000-V Human Body Model.
- Can the 74HC138DB118 be used for parallel expansion?
Yes, it can be used for parallel expansion to create higher-order decoders (e.g., 1-of-32 lines).
- What is the output drive capability of the 74HC138DB118?
The output drive capability is 10 LSTTL loads).
- Is the 74HC138DB118 compatible with CMOS, NMOS, and TTL outputs?
Yes, it is compatible with CMOS, NMOS, and TTL outputs).
- What is the ambient temperature range for the 74HC138DB118?
The ambient temperature range is from -40°C to 125°C).
- Can the 74HC138DB118 be used in automotive applications?
Yes, it can be used in automotive applications due to its robust specifications and compatibility).
