CD40147B - 10-Line to 4-Line BCD Priority Encoder

The CD40147B CMOS encoder features priority encoding of the inputs to ensure that only the highest-order data line is encoded. Ten data input lines (0-9) are encoded to four-line (8, 4, 2, 1) BCD. The highest priority line is line 9. All four output lines are logic 1 (V_SS) when all input lines are logic 0. All inputs and outputs are buffered, and each output can drive one TTL low-power Schottky load. The CD40147B is functionally similar to the TTL54/74147 if pin 15 is tied low.

The CD40147B types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (M, M96, MT and NSR suffixes), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).

Products containing the "CD40147B" keyword are: CD40147BE , CD40147BE , CD40147BEE4 , CD40147BEE4 , CD40147BEG4 , CD40147BF3A , CD40147BM , CD40147BM , CD40147BM96 , CD40147BM96E4 , CD40147BM96G4 , CD40147BME4 , CD40147BMG4 , CD40147BMT , CD40147BMT , CD40147BMTE4 , CD40147BMTG4 , CD40147BNSR , CD40147BNSR , CD40147BNSRE4

• Encodes 10-line to 4-line BCD
• Active low inputs and outputs
• Standardized, symmetrical output characteristics
• 100% tested for quiescent current at 20 V
• 5-V, 10-V, and 15-V parametric ratings
• Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
• Maximum input current of 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C
• Noise margin (full package temperature range) =
       1 V at V_DD = 5 V
       2 V at V_DD = 10 V
       2.5 V at V_DD = 15 V
• Applications:
  • Keyboard encoding
  • 10-line to BCD encoding
  • Range selection