74LS390

DM74LS390 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

■ Dual version of the popular DM74LS90 ■ DM74LS390...individual clocks for A and B flip-flops provide dual ÷ 2 and ÷ 5 counters ■ Direct clear for each 4-bit counter ■ Dual 4-bit version can significantly improve system den- sities by reducing counter package count by 50% ■ Typical maximum count frequency...35 MHz ■ Buffered outputs reduce possibility of collector commu- tation Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Order Number Package Number Package Description DM74LS390M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS390N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

www.fairchildsemi.com 2 DM74LS390 Function Tables BCD Count Sequence (Each Counter) (Note 1) Bi-Quinary (5-2) (Each Counter) (Note 2) H = HIGH Level L = LOW Level Note 1: Output QA is connected to input B for BCD count. Note 2: Output QD is connected to input A for Bi-quinary count. Logic Diagram Count Outputs Q D Q C Q B Q A 0LLLL 1LLLH 2LLHL 3LLH H 4LHLL 5LHLH 6LH HL 7LH H H 8HLLL 9HLLH Count Outputs Q A Q D Q C Q B 0LLLL 1LLLH 2LLHL 3LLH H 4LHLL 5HLLL 6HLLH 7HLHL 8HLHH 9HHLL

3 www.fairchildsemi.com DM74LS390 Absolute Maximum Ratings(Note 3) Note 3: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions Note 4: C L = 15 pF , RL = 2 kΩ , TA = 25°C and VCC = 5V. Note 5: C L = 50 pF , RL = 2 kΩ , TA = 25°C and VCC = 5V. Note 6: The symbol (↓) indicates the falling edge of the clear pulse is used for reference. Note 7: TA = 25°C and VCC = 5V.

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) Note 8: All typicals are at VCC = 5V, TA = 25°C. Note 9: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 10: ICC is measured with all outputs OPEN, both CLEAR inputs grounded following momentary connection to 4.5 and all other inputs grounded. Supply Voltage 7V Input Voltage Clear 7V A or B 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units VCC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA fCLK Clock Frequency (Note 4) A to QA 02 5 MHzB to QB 02 0 fCLK Clock Frequency (Note 5) A to QA 02 0 MHzB to QB 01 5 tW Pulse Width (Note 4) A 20 B2 5 n s Clear HIGH 20 t REL Clear Release Time (Note 6)(Note 7) 25 ↓ ns TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 8) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V VOH HIGH Level V CC = Min, IOH = Max 2.7 3.4 V Output Voltage V IL = Max, VIH = Min VOL LOW Level V CC = Min, IOL = Max 0.35 0.5 Output Voltage V IL = Max, VIH = Min V IOL = 4 mA, VCC = Min 0.25 0.4 II Input Current @ Max V CC = Max, VI = 7V Clear 0.1 Input Voltage V CC = Max A 0.2 mA VI = 5.5V B 0.4 IIH HIGH Level V CC = Max Clear 20 Input Current V I = 2.7V A 40 µA B8 0 IIL LOW Level V CC = Max, VI = 0.4V Clear −0.4 Input Current A −1.6 mA B −2.4 IOS Short Circuit Output Current VCC = Max (Note 9) −20 −100 mA ICC Supply Current V CC = Max (Note 10) 15 26 mA

www.fairchildsemi.com 4 DM74LS390 Switching Characteristics at VCC = 5V and TA = 25°C R L = 2 kΩ Symbol Parameter From (Input) C L = 15 pF C L = 50 pF Units To (Output) Min Max Min Max fMAX Maximum Clock A to Q A 25 20 MHz Frequency B to Q B 20 15 tPLH Propagation Delay Time A to QA 20 24 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time A to QA 20 30 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time A to QC 60 81 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time A to QC 60 81 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time B to QB 21 27 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time B to QB 21 33 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time B to QC 39 51 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time B to QC 39 54 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time B to QD 21 27 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time B to QD 21 33 ns HIGH-to-LOW Level Output tPHL Propagation Delay Time Clear to Any Q 39 45 ns HIGH-to-LOW Level Output

5 www.fairchildsemi.com DM74LS390 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A

6 www.fairchildsemi.com DM74LS390 Dual 4-Bit Decade Counter 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com