Part # 74LS390 datasheet

Part Manufacturer: Motorola


Part Description: 74LS390

Part Details:

SN54/74LS390 DUAL DECADE COUNTER; SN54/74LS393 DUAL 4-STAGEBINARY COUNTER DUAL DECADE COUNTER; The SN54 / 74LS390 and SN54 / 74LS393 each contain a pair of high-speed DUAL 4-STAGE 4-stage ripple counters. Each half of the LS390 is partitioned into adivide-by-two section and a divide-by five section, with a separate clock input BINARY COUNTER for each section. The two sections can be connected to count in the LOW POWER SCHOTTKY BCD code or they can count in a biquinary sequence to provide a square wave(50% duty cycle) at the final output. Each half of the LS393 operates as a Modulo-16 binary divider, with the last three stages triggered in a ripple fashion. In both the LS390 and the LS393,the flip-flops are triggered by a HIGH-to-LOW transition of their CP inputs.Each half of each circuit type has a Master Reset input which responds to a J SUFFIX HIGH signal by forcing all four outputs to the LOW state. CERAMIC · CASE 620-09 Dual Versions of LS290 and LS293 16 · LS390 has Separate Clocks Allowing ÷2, ÷2.5, ÷5 1 · Individual Asynchronous Clear for Each Counter · Typical Max Count Frequency of 50 MHz N SUFFIX · Input Clamp Diodes Minimize High Speed Termination Effects PLASTIC CASE 648-08 16 1 CONNECTION DIAGRAM DIP (TOP VIEW) D SUFFIX SN54 / 74LS390 SOIC 16 V CASE 751B-03 CC CP0 MR Q0 CP1 Q Q 1 2 Q3 1 16 15 14 13 12 11

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74LS390.pdf Datasheet