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| DM74LS90 Decade and Binary Counters August 1986 Revised March 2000 DM74LS90 Decade and Binary Counters General Description Each of these monolithic counters contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five for the DM74LS90. All of these counters have a gated zero reset and the DM74LS90 also has gated set-to-nine inputs for use in BCD nine's complement applications. To use their maximum count length (decade or four bit binary), the B input is connected to the QA output. The input count pulses are applied to input A and the outputs are as described in the appropriate truth table. A symmetrical divide-by-ten count can be obtained from the DM74LS90 counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA. Features s Typical power dissipation 45 mW s Count frequency 42 MHz Ordering Code: Order Number DM74LS90M DM74LS90N Package Number M14A N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow 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 Reset/Count Truth Table Reset Inputs R0(1) H H X X L L X R0(2) H H X L X X L R9(1) L X H X L X L R9(2) X L H L X L X QD L L H Output QC L L L QB L L L QA L L H COUNT COUNT COUNT COUNT (c) 2000 Fairchild Semiconductor Corporation DS006381 www.fairchildsemi.com DM74LS90 Function Tables BCD Count Sequence (Note 1) Count QD 0 1 2 3 4 5 6 7 8 9 L L L L L L L L H H QC L L L L H H H H L L Output QB L L H H L L H H L L QA L H L H L H L H L H Logic Diagram Bi-Quinary (5-2) (Note 2) Count QA 0 1 2 3 4 5 6 7 8 9 H = HIGH Level L = LOW Level X = Don't Care 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. Note 3: Output QA is connected to input B. The J and K inputs shown without connection are for reference only and are functionally at a high level. Output QD L L L L H L L L L H QC L L H H L L L H H L QB L H L H L L H L H L L L L L L H H H H H www.fairchildsemi.com 2 DM74LS90 Absolute Maximum Ratings(Note 4) Supply Voltage Input Voltage (Reset) Input Voltage (A or B) Operating Free Air Temperature Range Storage Temperature Range 7V 7V 5.5V 0C to +70C -65C to +150C Note 4: 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" table are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL fCLK fCLK tW Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Clock Frequency (Note 5) Clock Frequency (Note 6) Pulse Width (Note 5) A to QA B to QB A to QA B to QB A B Reset tW Pulse Width (Note 6) A B Reset tREL tREL TA Reset Release Time (Note 5) Reset Release Time (Note 6) Free Air Operating Temperature 0 0 0 0 15 30 15 25 50 25 25 35 0 70 ns ns C ns ns Parameter Min 4.75 2 0.8 -0.4 8 32 16 20 10 MHz Nom 5 Max 5.25 Units V V V mA mA MHz Note 5: CL = 15 pF, RL = 2 k, TA = 25C and VCC = 5V. Note 6: CL = 50 pF, RL = 2 k, TA = 25C and VCC = 5V. Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II Input Current @ Max Input Voltage IIH HIGH Level Input Current IIL LOW Level Input Current IOS ICC Short Circuit Output Current Supply Current VCC = Max (Note 9) VCC = Max (Note 7) VCC = Max, VI = 0.4V Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max, VI = 7V VCC = Max VI = 5.5V VCC = Max, VI = 2.7V Reset A B Reset A B Reset A B -20 9 (Note 8) 2.7 3.4 Min Typ (Note 7) Max -1.5 Units V V 0.35 0.25 0.5 0.4 0.1 0.2 0.4 20 40 80 -0.4 -2.4 -3.2 -100 15 V mA A mA mA mA Note 7: All typicals are at VCC = 5V, TA = 25C. 3 www.fairchildsemi.com DM74LS90 Electrical Characteristics (Continued) Note 8: QA outputs are tested at IOL = Max plus the limit value of IIL for the B input. This permits driving the B input while maintaining full fan-out capability. 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 RO inputs grounded following momentary connection to 4.5V and all other inputs grounded. Switching Characteristics at VCC = 5V and TA = 25C From (Input) Symbol Parameter To (Output) A to QA B to QB A to QA A to QA A to QD A to QD B to QB B to QB B to QC B to QC B to QD B to QD SET-9 to QA, QD SET-9 to QB, QC SET-0 to Any Q CL = 15 pF Min fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPHL Maximum Clock Frequency Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time HIGH-to-LOW Level Output 32 16 16 18 48 50 16 21 32 35 32 35 30 40 40 Max RL = 2 k CL = 50 pF Min 20 10 20 24 52 60 23 30 37 44 36 44 35 48 52 Max MHz ns ns ns ns ns ns ns ns ns ns ns ns ns Units www.fairchildsemi.com 4 DM74LS90 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 DM74LS90 Decade and Binary Counters 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: 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 6 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. www.fairchildsemi.com |
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