SN54/74LS490 DUAL DECADE COUNTER The SN54 / 74LS490 contains a pair of high-speed 4-stage ripple counters. Each half of the SN54 / 74LS490 has individual Clock, Master Reset and Master Set (Preset 9) inputs. Each section counts in the 8, 4, 2, 1 BCD code. • • • • Dual Version of SN54 / 74LS490 Individual Asynchronous Clear and Preset to 9 for Each Counter Count Frequency — Typically 65 MHz Input Clamp Diodes Limit High-Speed Termination Effects DUAL DECADE COUNTER LOW POWER SCHOTTKY CONNECTION DIAGRAM DIP (TOP VIEW) J SUFFIX CERAMIC CASE 620-09 16 1 PIN NAMES MS MR CP Q0 – Q3 N SUFFIX PLASTIC CASE 648-08 16 1 LOADING (Note a) Master Set (Set to 9) Input Master Reset Clock Input (Active LOW Going Edge) Counter Outputs (Note b) HIGH LOW 0.5 U.L. 0.5 U.L. 1.5 U.L. 10 U.L. 0.25 U.L. 0.25 U.L. 1.5 U.L. 5 (2.5) U.L. 16 1 ORDERING INFORMATION NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. SN54LSXXXJ SN74LSXXXN SN74LSXXXD LOGIC DIAGRAM (ONE HALF SHOWN) OUTPUTS Ceramic Plastic SOIC TRUTH TABLE D SUFFIX SOIC CASE 751B-03 FAST AND LS TTL DATA 5-563 COUNT Q3 Q2 Q1 Q0 0 1 2 L L L L L L L L H L H L 3 4 5 L L L L H H H L L H L H 6 7 8 9 L L H H H H L L H H L L L H L H SN54 / 74LS490 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54, 74 – 0.4 mA IOL Output Current — Low 54 74 4.0 8.0 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 1) ICC Power Supply Current Typ Max Unit 2.0 54 0.7 74 0.8 – 0.65 – 1.5 Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = – 18 mA 54 2.5 3.5 V 74 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VCC = VCC MIN, VIN = VIL or VIH per Truth Table 54, 74 0.25 0.4 V IOL = 4.0 mA 74 0.35 0.5 V IOL = 8.0 mA 20 µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V mA VCC = MAX, VIN = 0.4 V – 100 mA VCC = MAX 26 mA VCC = MAX Max Unit MS, MR – 0.4 Clock –1.6 – 20 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC SET-UP REQUIREMENTS (TA = 25°C, VCC = 5.0 V) Limits Symbol Parameter Min Typ tW Any Pulse Width 20 ns ts MR or MS to Setup Time 25 ns FAST AND LS TTL DATA 5-564 Test Conditions VCC = 5.0 V SN54/74LS490 AC CHARACTERISTICS (TA = 25°C) Limits Symbol Parameter Min Typ 25 35 fMAX Maximum Clock Frequency tPLH tPHL Propagation Delay, CP to Q0 12 13 tPLH tPHL Propagation Delay, CP to Q1 or Q3 tPLH tPHL Unit Max Test Conditions MHz Figure 1 20 20 ns Figure 1 24 26 39 39 ns Figure 3 Propagation Delay, CP to Q2 32 36 54 54 ns Figure 2 tPHL Propagation Delay, MR to Output 24 39 ns Figure 2 tPLH tPHL Propagation Delay, MS to Output 24 20 39 36 ns Figure 2 VCC = 5.0 V, CL = 15 pF AC WAVEFORMS Figure 1 Figure 2 Figure 3 *The number of Clock Pulses required between the tPHL and tPLH measurements can be determined from the Truth Table. FAST AND LS TTL DATA 5-565 Case 751B-03 D Suffix 16-Pin Plastic SO-16 -A- "! ! " " ! " # 1 %# ) ! !" $ !" 8 C -T- D M K " ! #! J F ! Case 648-08 N Suffix 16-Pin Plastic R X 45° G " ! ) #! P ! " " 9 -B- ! 16 & ! ! ° ° ° ° ( ( ( ( "! ! " " ! ! ' " " ! ' ! " # & -A- 16 9 1 8 ! ! $ ! B # ) " ! " # ) !" $ !" ) F L C S -T- K H G M J D " Case 620-09 J Suffix 16-Pin Ceramic Dual In-Line -A- ! ! ! ! ° ° ° ° "! ! " 16 " ) " L K M N J G D " $ " $ ! " " ! ! FAST AND LS TTL DATA 5-566 & # ) !" $ !" ) -T $ " " C F & 8 E ! ! ! " " -B1 & 9 * * ! ! ! ! * * ! ° ° ! ° ° Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. 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ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. ◊ FAST AND LS TTL DATA 5-567