CD4028 - BCD to Decimal Decoder

CD4028 - BCD to Decimal Decoder

The CD4028BC is a BCD-to-decimal or binary-to-octal decoder consisting of 4 inputs, decoding logic gates, and 10 output buffers. A BCD code applied to the 4 inputs, A, B, C, and D, results in a high level at the selected 1-of-10 decimal decoded outputs. Similarly, a 3-bit binary code applied to inputs A, B, and C is decoded in octal at outputs 0–7. A high level signal at the D input inhibits octal decoding and causes outputs 0–7 to go LOW. All inputs are protected against static discharge damage by diode clamps to VDD and VSS.

Features:

• BCD-to-decimal decoding or binary-to-octal decoding
• High decoded output drive capability
• "Positive logic" inputs and outputs……decoded outputs go high on selection
• Medium-speed operation… tPHL, tPLH = 80 ns (typ.) @ VDD = 10 V
• Standardized, symmetrical output characteristics
• 100% tested for quiescent current at 20 V
• 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 VDD = 5 V
          2 V at VDD = 10 V 
       2.5 V at VDD = 15 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"

• Code conversion
• Indicator-tube decoder
• Address decoding-memory selection control