SN54/74LS245 OCTAL BUS TRANSCEIVER The SN54 / 74LS245 is an Octal Bus Transmitter/Receiver designed for 8-line asynchronous 2-way data communication between data buses. Direction Input (DR) controls transmission of Data from bus A to bus B or bus B to bus A depending upon its logic level. The Enable input (E) can be used to isolate the buses. • • • • OCTAL BUS TRANSCEIVER Hysteresis Inputs to Improve Noise Immunity 2-Way Asynchronous Data Bus Communication Input Diodes Limit High-Speed Termination Effects ESD > 3500 Volts LOW POWER SCHOTTKY LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) VCC E B1 B2 B3 B4 B5 B6 B7 B8 20 19 18 17 16 15 14 13 12 11 J SUFFIX CERAMIC CASE 732-03 20 1 1 2 3 4 5 6 7 8 9 10 DIR A1 A2 A3 A4 A5 A6 A7 A8 GND 20 1 1 INPUTS DIR L L H L H X DW SUFFIX SOIC CASE 751D-03 20 TRUTH TABLE E N SUFFIX PLASTIC CASE 738-03 OUTPUT Bus B Data to Bus A Bus A Data to Bus B Isolation ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial 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 – 3.0 mA 54 74 – 12 – 15 mA 54 74 12 24 mA IOL Output Current — Low FAST AND LS TTL DATA 5-398 SN54/74LS245 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol 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 Min Parameter 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 – 200 µA VCC = MAX, VOUT = 0.4 V A or B, DR or E 20 µA VCC = MAX, VIN = 2.7 V DR or E 0.1 mA VCC = MAX, VIN = 7.0 V A or B 0.1 mA VCC = MAX, VIN = 5.5 V – 0.2 mA VCC = MAX, VIN = 0.4 V – 225 mA VCC = MAX mA VCC = MAX Input HIGH Current IIL Input LOW Current IOS Output Short Circuit Current (Note 1) ICC Typ – 40 Power Supply Current Total, Output HIGH 70 Total, Output LOW 90 Total at HIGH Z 95 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, TRISE / TFALL ≤ 6.0 ns) Limits Symbol Parameter Min Typ Max Unit tPLH tPHL Propagation Delay, Data to Output 8.0 8.0 12 12 ns tPZH Output Enable Time to HIGH Level 25 40 ns tPZL Output Enable Time to LOW Level 27 40 ns tPLZ Output Disable Time from LOW Level 15 25 ns tPHZ Output Disable Time from HIGH Level 15 25 ns FAST AND LS TTL DATA 5-399 Test Conditions CL = 45 pF, RL = 667 Ω CL = 5.0 pF, RL = 667 Ω 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 5-400 * !" $ !" * ! ! ! ! ! ° ° ! ° ° 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. 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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 5-401