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SN74LS390 Datasheet(PDF) 1 Page - Motorola, Inc |
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SN74LS390 Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 7 page 5-544 FAST AND LS TTL DATA 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. • 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 CONNECTION DIAGRAM DIP (TOP VIEW) SN54 / 74LS390 SN54 / 74LS393 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 14 13 12 11 10 9 1 2 3 4 5 6 8 7 VCC CP MR Q0 Q1 Q2 Q3 CP MR Q0 Q1 Q2 Q3 GND 14 13 12 11 10 9 1 2 3 4 5 6 7 16 15 8 VCC CP0 CP0 MR Q0 CP1 Q2 Q1 Q3 MR Q0 CP1 Q1 Q2 Q3 GND SN54/74LS390 SN54/74LS393 LOW POWER SCHOTTKY ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXD SOIC J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 16 1 16 1 16 1 D SUFFIX SOIC CASE 751B-03 DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER J SUFFIX CERAMIC CASE 632-08 N SUFFIX PLASTIC CASE 646-06 14 1 14 1 14 1 D SUFFIX SOIC CASE 751A-02 |
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