Overview
The SN74LS47NS is a BCD-to-seven-segment decoder/driver integrated circuit produced by Texas Instruments. This component is designed to decode BCD (Binary Coded Decimal) input into a seven-segment code that can directly drive common-anode digital displays such as LEDs or incandescent indicators. It simplifies the process of displaying numerical data by converting BCD inputs into the appropriate segment outputs for a seven-segment display.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | PDIP (N), SOP16 | |
| Pins | 16 | |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage (VCC) | 4.75 to 5.25 | V |
| Input Voltage (VI) | -0.5 to 7 | V |
| Output Current (IO) | -24 mA | mA |
| Power Dissipation (PD) | 500 mW | mW |
| Propagation Delay Time (tPLH, tPHL) | 130 ns, 32 ns | ns |
Key Features
- Direct drive for common-anode digital tubes, including LEDs and incandescent indicators.
- Full compatibility with TTL and DTL input and output logic levels.
- Conversion of BCD code to seven-segment display code.
- Open-collector outputs with a withstanding voltage up to 15V.
- Lamp-test provision and leading/trailing zero suppression.
- Blanking input (BI) for controlling lamp intensity or inhibiting outputs.
- Automatic leading and/or trailing-edge zero-blanking control (RBI and RBO).
Applications
- Driving common-anode digital tubes in displays and counters.
- Digital logic drivers, such as latches and other digital circuits.
- Battery-powered equipment requiring efficient display drivers.
Q & A
- What is the primary function of the SN74LS47NS?
The primary function is to decode BCD input into a seven-segment code to drive common-anode digital displays.
- What types of displays can the SN74LS47NS drive directly?
It can drive common-anode LEDs or incandescent indicators directly.
- What is the operating temperature range of the SN74LS47NS?
The operating temperature range is 0 to 70°C.
- What is the supply voltage range for the SN74LS47NS?
The supply voltage range is 4.75 to 5.25 V.
- Does the SN74LS47NS support TTL and DTL logic levels?
Yes, it is fully compatible with TTL and DTL input and output logic levels.
- What is the purpose of the blanking input (BI) on the SN74LS47NS?
The blanking input (BI) can be used to control lamp intensity by pulsing or to inhibit the outputs.
- How does the SN74LS47NS handle leading and trailing zeros?
It incorporates automatic leading and/or trailing-edge zero-blanking control (RBI and RBO).
- What is the maximum output current of the SN74LS47NS?
The maximum output current is -24 mA.
- What are some common applications of the SN74LS47NS?
Common applications include driving digital tubes in displays and counters, digital logic drivers, and battery-powered equipment.
- What are the package options available for the SN74LS47NS?
The component is available in PDIP (N) and SOP16 packages.
