SN74LS390

DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER The SN54 / 74LS390 and SN54 / 74LS393 each contain a pair of high-speed 4-stage ripple counters. Each half of the LS390 is partitioned into a divide-by-two section and a divide-by five section, with a separate clock input for each section. The two sections can be connected to count in the 8.4.2.1 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 HIGH signal by forcing all four outputs to the LOW state. SN54/74LS390 SN54/74LS393 DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER LOW POWER SCHOTTKY Dual Versions of LS290 and LS293 LS390 has Separate Clocks Allowing ÷ 2, ÷ 2.5, ÷ 5 Individual Asynchronous Clear for Each Counter Typical Max Count Frequency of 50 MHz Input Clamp Diodes Minimize High Speed Termination Effects J SUFFIX CERAMIC CASE 620-09 16 1 16 1 N SUFFIX PLASTIC CASE 648-08 CONNECTION DIAGRAM DIP (TOP VIEW) SN54 / 74LS390 VCC 16 CP0 15 MR 14 Q0 13 CP1 12 Q1 11 Q2 10 Q3 9 16 1 D SUFFIX SOIC CASE 751B-03 J SUFFIX CERAMIC CASE 632-08 14 1 1 CP0 2 MR 3 Q0 4 CP1 5 Q1 6 Q2 7 Q3 8 GND NOTE: The Flatpak version has the same pinouts (...