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DM74ALS390 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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DM74ALS390 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page TLF9169 PRELIMINARY April 1987 DM54ALS390DM74ALS390 Dual 4-Bit Decade Counters General Description Each of these monolithic counters contains eight master- slave flip-flops and additional gating to implement two inde- pendent four bit counters in a single package To use their maximum count length the B input is connect- ed 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 ob- tained by connecting the QD output to the A input and ap- plying the input count to the B input Features Y Switching specifications at 50 pF Y Switching specifications guaranteed over full tempera- ture and VCC range Y Advanced oxide-isolated ion-implanted Schottky TTL process Y Individual clocks for A and B flip-flops provide dual di- vide-by-2 and divide-by-5 counters Y Direct clear for each 4-bit counter Connection Diagram TLF9169 – 1 Order Number DM54ALS390J DM74ALS390M or DM74ALS390N See NS Package Number J16A M16A or N16A Function Tables BCD Count Sequence (See Note 2) Count Output QD QC QB QA 0L L L L 1L L L H 2L L H L 3L L H H 4L H L L 5L H L H 6L H H L 7L H H H 8H L L L 9H L L H Bi-Quinary (5-2) (See Note 3) Count Output QA QD QC QB 0L L L L 1L L L H 2L L H L 3L L H H 4L H L L 5H L L L 6H L L H 7H L H L 8H L H H 9H H L L Note 2 Output QA is connected to input B for BCD count Note 3 Output QD is connected to input A for bi-quinary count H e High Logic Level L e Low Logic Level This document contains information on a product under development NSC reserves the right to change or discontinue this product without notice C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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Mô tả tương tự - DM74ALS390 |
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