HD74HC4518 - Hitachi Semiconductor

HD74HC4518 Dual BCD Use Converters/Dual Binary Up Converters

The HD74HC4518 dual BCD counter and the HD74HC4520 dual binary counter consist of two identical, independent, internally synchronous 4-stage counters. The counter stages are type D flip-flops, with interchangeable Clock and Enable lines for incrementing on either the positive-going or negative-going transition as required when cascading multiple stages. Each.

Features

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• High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Clock Enable H L X X L H X X Reset L L L L L L H Operation Increment counter Increment counter No change No change No change No change Q0 to Q 3 = L HD74HC4518/HD74HC4520 Pin Arrangement Clock A Enable A Q0 A Q1 A Q2 A Q3 A Reset A GND 1 2 3 4 5 6 7 8 (Top view) C Q0 Q1 Q2 Q3 R R Q3 Q2 Q1 Q0 C 16 VCC 15 Reset B 14 Q3 B 13 Q2 B 12 Q1 B 11 Q0 B 10 Enable B 9 Clock B 2 .