Overview
The 74HC42D,652 from Nexperia USA Inc. is a high-speed CMOS BCD to decimal decoder integrated circuit. This device is designed to accept four BCD (Binary Coded Decimal) inputs and provide ten mutually exclusive outputs. It is particularly useful in applications where a BCD input needs to be decoded into a decimal format, such as in display drivers, alarm systems, and other digital circuits. The 74HC42D is part of the 74HC family, known for its low power consumption and high noise immunity, making it suitable for a wide range of electronic designs.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | 74HC42D |
| Package | SO16 (SOT109-1) |
| Supply Voltage (VCC) | 2.0 V to 6.0 V |
| Logic Switching Levels | CMOS |
| Output Drive Capability | ± 5.2 mA |
| Propagation Delay (tpd) | 17 ns |
| Power Dissipation | Low power dissipation |
| Operating Temperature Range | -40 °C to +125 °C |
| ESD Protection | HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V |
Key Features
- Accepts four BCD inputs (0A to 3A) and provides ten mutually exclusive outputs (0Y to 9Y)
- Outputs disabled for input codes above nine
- Useful inhibit function when the device is used as a 1-of-8 decoder
- 1-of-8 demultiplexing capability
- Inputs include clamp diodes for interfacing with voltages in excess of VCC
- Complies with JEDEC standard no. 7A
- High noise immunity and low power dissipation
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
Applications
The 74HC42D is versatile and can be used in various applications across different industries, including:
- Display drivers: Decoding BCD inputs for display purposes in digital displays.
- Alarm systems: Converting BCD inputs into decimal outputs for alarm triggering and display.
- Digital circuits: General-purpose decoding in digital circuits where BCD to decimal conversion is required.
- Automotive and industrial systems: Where low power consumption and high noise immunity are critical.
- Consumer electronics: In devices that require efficient and reliable BCD to decimal decoding.
Q & A
- What is the primary function of the 74HC42D?
The primary function of the 74HC42D is to decode four BCD inputs into ten mutually exclusive decimal outputs. - What is the supply voltage range for the 74HC42D?
The supply voltage range for the 74HC42D is from 2.0 V to 6.0 V. - What type of logic switching levels does the 74HC42D use?
The 74HC42D uses CMOS logic switching levels. - What is the propagation delay of the 74HC42D?
The propagation delay of the 74HC42D is 17 ns. - Does the 74HC42D have ESD protection?
Yes, the 74HC42D has ESD protection: HBM exceeds 2000 V and CDM exceeds 1000 V. - What is the operating temperature range of the 74HC42D?
The operating temperature range of the 74HC42D is from -40 °C to +125 °C. - Can the 74HC42D be used as a 1-of-8 decoder?
Yes, the 74HC42D can be used as a 1-of-8 decoder with the most significant input (3A) acting as an inhibit function. - What type of package does the 74HC42D come in?
The 74HC42D comes in an SO16 (SOT109-1) package. - Is the 74HC42D RoHS compliant?
Yes, the 74HC42D is RoHS compliant. - What are some common applications of the 74HC42D?
The 74HC42D is commonly used in display drivers, alarm systems, digital circuits, automotive and industrial systems, and consumer electronics.
