| Technology Family | LS |
| Function | Encoder |
| Configuration | 8:3 |
| Number of channels (#) | 1 |
| Operating temperature range (C) | -55 to 125 |
| Rating | Military |
- '147, 'LS147
- Encodes 10-Line Decimal to 4-Line BCD
- Applications Include:
- Keyboard Encoding
- Range Selection
- '148, 'LS148
- Encodes 8 Data Lines to 3-Line Binary (Octal)
- Applications Include:
- N-Bit Encoding
- Code Converters and Generators
NOTE: The SN54147, SN54LS147, SN54148, SN74147, SN74LS147, and SN74148 are obsolete and are no longer supplied.
These TTL encoders feature priority decoding of the inputs to ensure that only the highest-order data line is encoded. The '147 and 'LS147 encode nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition requires no input condition as zero is encoded when all nine data lines are at a high logic level. The '148 and 'LS148 encode eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input E1 and enable output E0) has been provided to allow octal expansion without the need for external circuitry. For all types, data inputs and outputs are active at the low logic level. All inputs are buffered to represent one normalized Series 54/74 or 54LS/74LS load, respectively.