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| 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 LOW POWER SCHOTTKY * * * * Hysteresis Inputs to Improve Noise Immunity 2-Way Asynchronous Data Bus Communication Input Diodes Limit High-Speed Termination Effects ESD > 3500 Volts LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) VCC 20 E 19 B1 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 20 1 J SUFFIX CERAMIC CASE 732-03 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND 20 1 N SUFFIX PLASTIC CASE 738-03 TRUTH TABLE INPUTS OUTPUT E L L H DIR L H X Bus B Data to Bus A Bus A Data to Bus B Isolation 20 1 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial GUARANTEED OPERATING RANGES Symbol VCC TA IOH Supply Voltage Operating Ambient Temperature Range Output Current -- High Parameter 54 74 54 74 54, 74 54 74 IOL Output Current -- Low 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 3.0 - 12 - 15 12 24 Unit V C mA mA mA FAST AND LS TTL DATA 5-1 SN54/74LS245 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VT+-VT- VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Hysteresis Input Clamp Diode Voltage 54, 74 Output HIGH Voltage 54, 74 54, 74 VOL IOZH IOZL Output LOW Voltage 74 Output Off Current HIGH Output Off Current LOW A or B, DR or E IIH Input HIGH C I Current DR or E A or B IIL IOS Input LOW Current Output Short Circuit Current (Note 1) Power Supply Current Total, Output HIGH ICC Total, Output LOW Total at HIGH Z - 40 0.35 0.5 20 - 200 20 0.1 0.1 - 0.2 - 225 70 90 95 mA VCC = MAX V A A A mA mA mA mA 2.0 0.25 0.4 V V 2.4 0.2 0.4 - 0.65 3.4 - 1.5 0.8 V V V Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = - 3.0 mA VCC = MIN, IOH = MAX IOL = 12 mA IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VOUT = 2.7 V VCC = MAX, VOUT = 0.4 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 5.5 V VCC = MAX, VIN = 0.4 V VCC = MAX Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V, TRISE / TFALL 6.0 ns) Limits Symbol S bl tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter P Propagation Delay, Data to Output Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Disable Time from LOW Level Output Disable Time from HIGH Level Min Typ 8.0 8.0 25 27 15 15 Max 12 12 40 40 25 25 Unit Ui ns ns ns ns ns CL = 5.0 p , pF, RL = 667 CL = 45 pF, RL = 667 Test C di i T Conditions FAST AND LS TTL DATA 5-2 |
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