Overview
The SN74LS145DG4 is a BCD-to-Decimal Decoders/Drivers integrated circuit manufactured by Texas Instruments. This device is part of the 74LS series, known for its low power Schottky logic. Although the SN74LS145DG4 is currently listed as obsolete and no longer manufactured, it remains relevant for existing designs and maintenance of older systems.
The SN74LS145 is designed to convert BCD (Binary Coded Decimal) inputs into decimal outputs, making it useful in various digital systems that require decimal display or control. The device features four BCD inputs and ten decimal outputs, along with additional control inputs for enabling and selecting the output mode.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC | - |
| Number of Pins | 16 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage | 4.75 to 5.25 | V |
| Input Voltage Range | -0.5 to Vcc + 0.5 | V |
| Output Current (per output) | -0.4 to 8 | mA |
| Propagation Delay Time (max) | 25 | ns |
| Power Dissipation (max) | 80 | mW |
Key Features
- BCD-to-Decimal Conversion: Converts 4-bit BCD inputs to 10-line decimal outputs.
- Low Power Schottky Logic: Part of the 74LS series, known for low power consumption.
- Enable and Select Inputs: Allows for output enable and mode selection.
- High Output Drive Capability: Can drive long cables or multiple loads.
- Wide Operating Temperature Range: Operates from 0°C to 70°C.
Applications
- Decimal Displays: Used in systems requiring decimal displays such as calculators, meters, and other digital instruments.
- Control Systems: Employed in control systems where BCD inputs need to be converted to decimal outputs for further processing or display.
- Industrial Automation: Utilized in industrial automation for decoding BCD signals from sensors or other devices.
- Legacy Systems Maintenance: Important for maintaining and repairing older electronic systems that use this component.
Q & A
- What is the primary function of the SN74LS145DG4?
The primary function is to convert BCD (Binary Coded Decimal) inputs into decimal outputs.
- What package type does the SN74LS145DG4 come in?
The SN74LS145DG4 comes in a 16-pin SOIC package.
- What is the operating temperature range of the SN74LS145DG4?
The operating temperature range is from 0°C to 70°C.
- Is the SN74LS145DG4 still in production?
No, the SN74LS145DG4 is listed as obsolete and no longer manufactured.
- What are some common applications of the SN74LS145DG4?
Common applications include decimal displays, control systems, industrial automation, and maintenance of legacy systems.
- What is the maximum propagation delay time for the SN74LS145DG4?
The maximum propagation delay time is 25 ns.
- Can the SN74LS145DG4 drive multiple loads?
- What are the enable and select inputs used for in the SN74LS145DG4?
The enable and select inputs allow for output enable and mode selection.
- Is the SN74LS145DG4 RoHS compliant?
- Where can I find substitutes for the SN74LS145DG4?
Substitutes such as the SN74LS145DR are available and recommended for new designs.
