Overview
The SN74LS247N3, produced by Texas Instruments, is a BCD-to-Seven-Segment Decoder/Driver integrated circuit. This device is part of the LS series and is designed to convert Binary Coded Decimal (BCD) inputs into seven-segment display outputs. It is electrically and functionally identical to the SN5447A/SN7447A and has the same pin assignments as its equivalents, making it interchangeable in various design applications. The SN74LS247N3 features active-low outputs, which are suitable for driving indicators directly, and includes several control features for lamp intensity and zero suppression.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.75 | 5.0 | 5.25 | V |
| Operating Ambient Temperature Range (TA) | 0 | 25 | 70 | °C |
| Input HIGH Voltage (VIH) | 2.0 | V | ||
| Input LOW Voltage (VIL) | 0.8 | V | ||
| Output Current – High (IOH) | -50 | μA | ||
| Output Current – Low (IOL) | 3.2 | mA | ||
| Off–State Output Voltage (VO(off)) | 15 | V | ||
| Package Type | 16-DIP (0.300", 7.62mm) | |||
| Mounting Type | Through Hole |
Key Features
- Open-Collector Outputs: Drive indicators directly.
- Lamp-Test Provision: Allows for lamp testing at any time when the BI/RBO node is at a high level.
- Leading/Trailing Zero Suppression: Automatic leading and/or trailing-edge zero-blanking control (RBI and RBO).
- Internal Pull-Ups: Eliminate the need for external resistors.
- Overriding Blanking Input (BI): Can be used to control lamp intensity by pulsing or to inhibit the outputs.
- Full Ripple-Blanking Input/Output Controls: Enhance display stability and authenticity.
- TTL Logic Compatibility: Inputs and outputs are entirely compatible with TTL logic outputs.
Applications
The SN74LS247N3 is widely used in various display applications, including:
- Seven-Segment Displays: For displaying numerical data in digital instruments, such as clocks, counters, and meters.
- Industrial Control Panels: To display status information and numerical data.
- Consumer Electronics: In devices like calculators, microwaves, and other appliances that require numerical displays.
- Automotive Systems: For dashboard displays and other in-vehicle information systems.
Q & A
- What is the primary function of the SN74LS247N3?
The primary function of the SN74LS247N3 is to convert Binary Coded Decimal (BCD) inputs into seven-segment display outputs.
- What type of outputs does the SN74LS247N3 have?
The SN74LS247N3 has active-low open-collector outputs designed for driving indicators directly.
- What is the operating temperature range of the SN74LS247N3?
The operating temperature range is from 0°C to 70°C.
- Does the SN74LS247N3 require external resistors?
No, the SN74LS247N3 has internal pull-ups that eliminate the need for external resistors.
- How can the lamp intensity be controlled in the SN74LS247N3?
The lamp intensity can be controlled by using the overriding blanking input (BI) to pulse or inhibit the outputs.
- Is the SN74LS247N3 compatible with TTL logic outputs?
- What is the purpose of the lamp test provision in the SN74LS247N3?
The lamp test provision allows for lamp testing at any time when the BI/RBO node is at a high level.
- What is the package type of the SN74LS247N3?
The package type is 16-DIP (0.300", 7.62mm).
- What is the mounting type of the SN74LS247N3?
The mounting type is through-hole.
- Can the SN74LS247N3 be used interchangeably with other similar devices?
