The “zero” is encoded when all nine data inputs are HIGH, forcing all four outputs HIGH. Figure 12.40 shows a 74LS147 decimal-to-BCD (10-line-to-4-line) priority encoder IC.
(The switch acts as an active-low input.) The truth table in Fig. These devices provide the 10-line to 4-line priority encoding function by use of the implied decimal “zero”. To generate a BCD output that is equivalent to a single selected decimal input, the switch corresponding to that decimal is closed. Featured by Sharvi Electronics A priority is assigned to each input so that when two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line l9 having the highest priority. The ’HC147 and CD74HCT147 9-input priority encoders accept data from nine active LOW inputs (l1 to l9) and provide binary representation on the four active LOW inputs (Y0 to Y3). 74HC147 Decimal to BCD Priority Encoder IC DIP-16 Packageħ4HC147 (74147) IC–Priority Encoder The ’HC147 and CD74HCT147 are high-speed silicon-gate CMOS devices and are pin-compatible with low power Schottky TTL (LSTTL).
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