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DM74ALS390 Datasheet Dual 4-bit Decade Counters

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: DM54ALS390 DM74ALS390 Dual 4-Bit Decade Counters PRELIMINARY April 1987 DM54ALS390 DM74ALS390 Dual 4-Bit Decade.

General Description

Each of these monolithic counters contains eight masterslave flip-flops and additional gating to implement two independent four bit counters in a single package To use their maximum count length the B input is connected to the QA output The input count pulses are applied to input A and the outputs are as described in the appropriate truth table A symmetrical divide-by-ten count can be obtained by connecting the QD output to the A input and applying the input count to the B input

Key Features

  • Y Y Y Y Y Switching specifications at 50 pF Switching specifications guaranteed over full temperature and VCC range Advanced oxide-isolated ion-implanted Schottky TTL process Individual clocks for A and B flip-flops provide dual divide-by-2 and divide-by-5 counters Direct clear for each 4-bit counter Connection Diagram Function Tables BCD Count Sequence (See Note 2) Count QD 0 1 2 3 4 5 TL F 9169.
  • 1 Output QC L L L L H H H H L L QB L L H H L L H H L L QA L H L H L H L H L H L L L.

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DM74ALS390 Distributor