器件名称:
DM74ALS390N
功能描述:
Dual 4-Bit Decade Counters
文件大小:
106.03KB 共6页
简 介:
DM54ALS390 DM74ALS390 Dual 4-Bit Decade Counters PRELIMINARY April 1987 DM54ALS390 DM74ALS390 Dual 4-Bit Decade Counters 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 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 L L L L L H H 6 7 8 9 Order Number DM54ALS390J DM74ALS390M or DM74ALS390N See NS Package Number J16A M16A or N16A Bi-Quinary (5-2) (See Note 3) Count QA 0 1 2 3 4 5 6 7 8 9 L L L L L H H H H H Output QD L L L L H L L L L H QC L L H H L L L H H L QB L H L H L L H L H L Note 2 Output QA is connected to input B for BCD count Note 3 Output QD is connected to input A f……
