Overview
The SN74LS47 is a BCD-to-Seven-Segment Decoder/Driver produced by Texas Instruments. This integrated circuit is designed to convert Binary Coded Decimal (BCD) inputs into the corresponding seven-segment display outputs. It features active-low outputs, making it suitable for driving common-anode LEDs or incandescent indicators directly. The device is part of the 74LS series, known for its low power consumption and compatibility with TTL logic outputs.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | PDIP, SOIC, SOP |
| Pins | 16 |
| Operating Temperature Range (°C) | 0 to 70 |
| Package Quantity | 25 (Tube), 40 (SOIC), 2000 (SOP) |
| Lead Finish/Ball Material | RoHS & Green NIPDAU |
| Moisture Sensitivity Level (MSL) | Level-1-260C-UNLIM |
| Eco Plan | RoHS & Green |
Key Features
- Active-low outputs designed for driving common-anode LEDs or incandescent indicators directly.
- Open-Collector Outputs for direct driving of indicators.
- Lamp-Test Provision for testing the display at any time.
- Leading/Trailing Zero Suppression to control the display of leading or trailing zeros.
- Internal Pull-Ups eliminate the need for external resistors in some configurations.
- Lamp Intensity Modulation Capability through overriding blanking input.
- Full ripple-blanking input/output controls (except for 'LS49).
- Compatibility with TTL logic outputs.
Applications
The SN74LS47 is widely used in various applications requiring BCD to seven-segment decoding, such as:
- Display systems in digital instruments and meters.
- Automotive and industrial control panels.
- Consumer electronics with numeric displays.
- Medical devices requiring numeric displays.
Q & A
- What is the primary function of the SN74LS47?
The primary function of the SN74LS47 is to convert Binary Coded Decimal (BCD) inputs into the corresponding seven-segment display outputs.
- What types of outputs does the SN74LS47 have?
The SN74LS47 has active-low outputs designed for driving common-anode LEDs or incandescent indicators directly.
- What is the operating temperature range of the SN74LS47?
The operating temperature range of the SN74LS47 is 0 to 70°C.
- What is the package type and pin count of the SN74LS47?
The SN74LS47 is available in PDIP, SOIC, and SOP packages, all with 16 pins.
- Does the SN74LS47 support lamp intensity modulation?
Yes, the SN74LS47 supports lamp intensity modulation through an overriding blanking input.
- Is the SN74LS47 compatible with TTL logic outputs?
Yes, the SN74LS47 is compatible with TTL logic outputs.
- What is the purpose of the lamp-test provision in the SN74LS47?
The lamp-test provision allows for testing the display at any time when the BI/RBO node is at a high level.
- Does the SN74LS47 have leading/trailing zero suppression?
Yes, the SN74LS47 incorporates automatic leading and/or trailing-edge zero-blanking control.
- What are some common applications of the SN74LS47?
Common applications include display systems in digital instruments, automotive and industrial control panels, consumer electronics, and medical devices.
- Is the SN74LS47 still recommended for new designs?
Yes, the SN74LS47 is still active and recommended for new designs.
