Revised March 2000 DM74LS393 Dual 4-Bit Binary Counter General Description Features Each of these monolithic circuits contains eight masterslave flip-flops and additional gating to implement two individual four-bit counters in a single package. The DM74LS393 comprises two independent four-bit binary counters each having a clear and a clock input. N-bit binary counters can be implemented with each package providing the capability of divide-by-256. The DM74LS393 has parallel outputs from each counter stage so that any submultiple of the input count frequency is available for system-timing signals. ■ Dual version of the popular DM74LS93 ■ DM74LS393 dual 4-bit binary counter with individual clocks ■ Direct clear for each 4-bit counter ■ Dual 4-bit versions can significantly improve system densities by reducing counter package count by 50% ■ Typical maximum count frequency 35 MHz ■ Buffered outputs reduce possibility of collector commutation Ordering Code: Order Number Package Number Package Description DM74LS393M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow DM74LS373N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Counter Sequence (Each Counter) Count Outputs QD QC QB 0 L L L QA L 1 L L L H 2 L L H L 3 L L H H 4 L H L L 5 L H L H 6 L H H L 7 L H H H 8 H L L L 9 H L L H 10 H L H L 11 H L H H 12 H H L L 13 H H L H 14 H H H L 15 H H H H H = HIGH Logic Level L = LOW Logic Level © 2000 Fairchild Semiconductor Corporation DS006434 www.fairchildsemi.com DM74LS393 Dual 4-Bit Binary Counter August 1986 DM74LS393 Logic Diagram www.fairchildsemi.com 2 Supply Voltage 7V Note 1: 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. Input Voltage Clear 7V A 5.5V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current fCLK Clock Frequency (Note 2) fCLK Clock Frequency (Note 3) tW Pulse Width (Note 5) 2 8 mA 0 25 MHz 0 20 MHz A 20 Clear HIGH 20 tREL Clear Release Time (Note 4)(Note 5) TA Free Air Operating Temperature V ns 25↓ ns 0 °C 70 Note 2: CL = 15 pF, RL = 2 kΩ, TA = 25°C and VCC = 5V. Note 3: CL = 50 pF, RL = 2 kΩ, TA = 25°C and VCC = 5V. Note 4: The symbol (↓) indicates that the falling edge of the clear pulse is used for reference. Note 5: TA = 25°C, and VCC = 5V. Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −18 mA VOH HIGH Level VCC = Min, IOH = Max Output Voltage VIL = Max, VIH = Min VOL LOW Level VCC = Min, IOL = Max Output Voltage VIL = Max, VIH = Min Min 2.7 IOL = 4 mA, VCC = Min II IIH Max Units −1.5 V 3.4 V 0.35 0.5 0.25 0.4 Input Current @ Max VCC = Max, VI = 7V Clear 0.1 Input Voltage VCC = Max, VI = 5.5V A 0.2 HIGH Level VCC = Max, VI = 2.7V Clear 20 A 40 Input Current IIL Typ (Note 6) LOW Level VCC = Max, VI = 0.4V Input Current IOS Short Circuit Output Current VCC = Max (Note 7) ICC Supply Current VCC = Max (Note 8) Clear −0.4 A −1.6 −20 15 V mA µA mA −100 mA 26 mA Note 6: All typicals are at VCC = 5V, TA = 25°C. Note 7: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 8: ICC is measured with all outputs open, both CLEAR inputs grounded following momentary connection to 4.5V, and all other inputs grounded. 3 www.fairchildsemi.com DM74LS393 Absolute Maximum Ratings(Note 1) DM74LS393 Switching Characteristics at VCC = 5V and TA = 25°C RL = 2 kΩ Symbol Parameter fMAX Maximum Clock Frequency tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output www.fairchildsemi.com CL = 15 pF From (Input) To (Output) Min A to QA 25 Max CL = 50 pF Min Units Max 20 MHz A to QA 20 24 ns A to QA 20 30 ns A to QD 60 87 ns A to QD 60 87 ns Clear to Any Q 39 45 ns 4 DM74LS393 Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow Package Number M14A 5 www.fairchildsemi.com DM74LS393 Dual 4-Bit Binary Counter Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N14A 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: 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 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 reasonably expected to result in a significant injury to the user. www.fairchildsemi.com www.fairchildsemi.com 6