The SN54/74LS147 and the SN54/74LS148 are Priority Encoders. They provide priority decoding of the inputs to ensure that only the highest order data line is encoded. Both devices have data inputs and outputs which are active at the low logic level. RoboticsBD
The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition does not require an input condition because zero is encoded when all nine data lines are at a high logic level. RoboticsBD
The LS148 encodes eight data lines to three-line (4-2-1) binary (octal). By providing cascading circuitry (Enable Input EI and Enable Output EO) octal expansion is allowed without needing external circuitry.
The SN54/74LS748 is a proprietary Motorola part incorporating a built-in deglitcher network which minimizes glitches on the GS output. The glitch occurs on the negative going transition of the EI input when data inputs 0–7 are at logical ones. RoboticsBD
The only dc parameter differences between the LS148 and the LS748 are that (1) Pin 10 (input 0) has a fan-in of 2 on the LS748 versus a fan-in of 1 on the LS148; (2) Pins 1, 2, 3, 4, 11, 12 and 13 (inputs 1, 2, 3, 4, 5, 6, 7) have a fan-in of 3 on the LS748 versus a fan-in of 2 on the LS148.
The only ac difference is that tPHL from EI to EO is changed from 40 to 45 ns. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
- L10-LINE-TO-4-LINE
- 8-LINE-TO-3-LINE
- PRIORITY ENCODERS
- LOW POWER SCHOTTKY
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| General Specification |
| Package/Case | PDIP-16 |
| Minimum Supply Voltage (V) | 4.5 |
| Maximum Supply Voltage (V) | 5.5 |
| Product Type | 10-LINE-TO-4-LINE
AND 8-LINE-TO-3-LINE
PRIORITY ENCODERS |
| Operating Temperature Range (°C) | –55° C to +125° C |
| Mounting Type | Through Hole |
| Shipment Weight | 0.005 kg |
| Shipment Dimensions | 3 × 3 × 3 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
- Datasheet TI
- Datasheet
Package Includes:
1 x 74147 Encoder.
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