DM74ALS390 Datasheet | National Semiconductor

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 Switching specifications at 50 p F 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 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 TL F 9169 RRD-B30M105 Printed in U S A Free Datasheet http://..net/ Absolute Maximum Rating If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C DM54ALS DM74ALS 0 C to a 70 C Storage...