SN54/74LS240 SN54/74LS241 SN54/74LS244 OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS The SN54 / 74LS240, 241 and 244 are Octal Buffers and Line Drivers designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers which provide improved PC board density. OCTAL BUFFER/ LINE DRIVER WITH 3-STATE OUTPUTS • Hysteresis at Inputs to Improve Noise Margins • 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers • Input Clamp Diodes Limit High-Speed Termination Effects LOW POWER SCHOTTKY LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) J SUFFIX CERAMIC CASE 732-03 SN54 / 74LS240 VCC 2G 20 19 1Y1 2A4 1Y2 18 17 16 2A3 15 1Y3 2A2 1Y4 14 13 12 2A1 20 11 1 N SUFFIX PLASTIC CASE 738-03 20 1 2 1G 1A1 3 4 5 2Y4 1A2 2Y3 6 1A3 7 8 9 2Y2 1A4 2Y1 1 10 GND SN54 / 74LS241 VCC 2G 20 19 1Y1 2A4 1Y2 18 17 16 2A3 15 1Y3 2A2 1Y4 14 DW SUFFIX SOIC CASE 751D-03 20 13 12 2A1 1 11 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC 1 2 1G 1A1 3 4 5 2Y4 1A2 2Y3 6 1A3 7 8 9 2Y2 1A4 2Y1 10 GND SN54 / 74LS244 VCC 2G 20 19 1 2 1G 1A1 1Y1 2A4 1Y2 18 17 16 3 4 5 2Y4 1A2 2Y3 2A3 15 6 1A3 1Y3 2A2 1Y4 14 13 12 7 8 9 2Y2 1A4 2Y1 2A1 11 10 GND FAST AND LS TTL DATA 5-387 SN54/74LS240 • SN54/74LS241 • SN54/74LS244 TRUTH TABLES SN54 / 74LS244 SN54 / 74LS240 INPUTS INPUTS OUTPUT 1G, 2G D L L H L H X OUTPUT H L (Z) 1G, 2G D L L H L H X L H (Z) SN54 / 74LS241 INPUTS INPUTS 1G D L L H L H X OUTPUT L H (Z) OUTPUT 2G D H H L L H X L H (Z) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = HIGH Impedance GUARANTEED OPERATING RANGES Min Typ Max Unit VCC Symbol 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 – 3.0 mA 54 74 – 12 – 15 mA 54 74 12 24 mA IOL Parameter Output Current — Low FAST AND LS TTL DATA 5-388 SN54/74LS240 • SN54/74LS241 • SN54/74LS244 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VT+–VT– Hysteresis VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IOZH IOZL IIH Input HIGH Current IIL Input LOW Current IOS Output Short Circuit Current (Note 1) Typ Max Unit 2.0 54 0.7 74 0.8 0.2 0.4 – 0.65 54, 74 2.4 54, 74 2.0 – 1.5 3.4 Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN V VCC = MIN, IIN = – 18 mA V VCC = MIN, IOH = – 3.0 mA V VCC = MIN, IOH = MAX VCC = VCC MIN, VIN = VIL or VIH per Truth Table 54, 74 0.25 0.4 V IOL = 12 mA 74 0.35 0.5 V IOL = 24 mA Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V Output Off Current LOW – 20 µA VCC = MAX, VOUT = 0.4 V 20 µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V – 0.2 mA VCC = MAX, VIN = 0.4 V – 225 mA VCC = MAX mA VCC = MAX – 40 Power Supply Current Total, Output HIGH Total, Output LOW ICC Total at HIGH Z 27 LS240 44 LS241/244 46 LS240 50 LS241/244 54 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits Symbol Parameter Min Typ Max Unit tPLH tPHL Propagation Delay, Data to Output LS240 9.0 12 14 18 ns tPLH tPHL Propagation Delay, Data to Output LS241 / 244 12 12 18 18 ns tPZH Output Enable Time to HIGH Level 15 23 ns tPZL Output Enable Time to LOW Level 20 30 ns tPLZ Output Disable Time from LOW Level 15 25 ns tPHZ Output Disable Time from HIGH Level 10 18 ns FAST AND LS TTL DATA 5-389 Test Conditions CL = 45 pF, RL = 667 Ω CL = 5.0 pF, RL = 667 Ω SN54/74LS240 • SN54/74LS241 • SN54/74LS244 AC WAVEFORMS Figure 1 Ω Figure 2 SWITCH POSITIONS ≈ Figure 3 Figure 5 ≥ ≈ Figure 4 FAST AND LS TTL DATA 5-390 Case 751D-03 DW Suffix 20-Pin Plastic SO-20 (WIDE) "! ! " -A11 1 10 ! " # P C -T- " #! D J F K ! #! * * !" $ !" M * R X 45° " " %# G ! " ! -B- ! " 20 & ! ! ° ° ° ° ) ) ) ! Case 732-03 J Suffix 20-Pin Ceramic Dual In-Line "! ! $" '' " # !" " !" " %# 20 " 11 1 10 B L C F N H G D J M K Case 738-03 N Suffix 20-Pin Plastic ! ! ° ° ° ° ! " " ! ( " " B ! ! $ ! ( ! " # ! C -T- L K G ! & 11 E ! 10 1 #! !#! "! -A20 ! $ A " " " N M F J D " " FAST AND LS TTL DATA 5-391 * !" $ !" * ! ! ! ! ! ° ° ! ° ° 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. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. SYMBOL SW1 SW2 tPLZ Closed Closed tPHZ Closed Closed Literature Distribution Centers: USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. tPZH Open Closed EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England. JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. tPZL Closed Open 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 5-392