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| OCTAL BUS TRANSCEIVERS These octal bus transceivers are designed for asynchronous two-way communication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmission from the A bus to B or from the B bus to A bus depending upon the logic level of the direction control (DIR) input. Enable input (G) can disable the device so that the buses are effectively isolated. DEVICE LS640 LS641 LS642 LS645 OUTPUT 3-State Open-Collector Open-Collector 3-State LOGIC Inverting True Inverting True SN54/74LS640 SN54/74LS641 SN54/74LS642 SN54/74LS645 OCTAL BUS TRANSCEIVERS LOW POWER SCHOTTKY FUNCTION TABLE CONTROL INPUTS G L L H DIR L H X LS640 LS642 B data to A bus A data to B bus Isolation OPERATION LS641 LS645 B data to A bus A data to B bus Isolation 20 1 J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 H = HIGH Level, L = LOW Level, X = Irrelevant 20 1 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC CONNECTION DIAGRAMS DIP (TOP VIEW) ENABLE B1 VCC G 20 19 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 ENABLE B1 VCC G 20 19 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND SN54 / 74LS640 SN54 / 74LS642 SN54 / 74LS641 SN54 / 74LS645 FAST AND LS TTL DATA 5-1 SN54/74LS640 * SN54/74LS645 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 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 54, 74 54, 74 VOL IOZH IOZL IIH IIL IOS Output LOW Voltage 74 Output Off Current HIGH Output Off Current LOW A or B, DIR or G Input HIGH Current Input LOW Current Output Short Circuit Current (Note 1) Power Supply Current Total Output HIGH ICC Total, Output LOW Total at HIGH Z Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. Min 2.0 54 74 Typ Max Unit V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs 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 0.5 0.6 - 0.65 2.4 2.0 0.25 0.35 0.4 0.5 20 - 400 20 0.1 0.1 - 0.4 - 40 - 225 70 90 95 3.4 - 1.5 V V V V V V A A A mA mA mA mA 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 DIR or G A or B mA VCC = MAX AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits LS640 Symbol tPLH tPHL tPLH tPHL tPZL tPZH tPZL tPZH tPLZ tPHZ tPLZ tPHZ Parameter Propagation Delay A to B Propagation Delay B to A Output Enable Time G, DIR to A Output Enable Time G, DIR to B Output Disable Time G, DIR to A Output Disable Time G, DIR to B Min Typ 6.0 8.0 6.0 8.0 31 23 31 23 15 15 15 15 Max 10 15 10 15 40 40 40 40 25 25 25 25 Min LS645 Typ 8.0 11 8.0 11 31 26 31 26 15 15 15 15 Max 15 15 15 15 40 40 40 40 25 25 25 25 Unit ns ns ns ns ns CL = 5.0 pF ns Test Conditions CL = 45 pF, RL = 667 FAST AND LS TTL DATA 5-2 SN54/74LS641 * SN54/74LS642 GUARANTEED OPERATING RANGES Symbol VCC TA VOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 5.5 12 24 Unit V C V mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK IOH VOL Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage Output HIGH Current Output LOW Voltage 74 Input HIGH Current -0.1 Input LOW Current Power Supply Current Total, Output HIGH ICC Total, Output LOW Total at HIGH Z - 0.4 70 90 95 mA VCC = MAX 0.35 0.5 20 IIH IIL V A mA mA 54, 74 54, 74 0.25 - 0.65 0.6 - 1.5 100 0.4 V A V Min 2.0 0.5 V Typ Max Unit V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, VOH = MAX IOL = 12 mA IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits LS641 Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay, A to B Propagation Delay, B to A Propagation Delay, G, DIR to A Propagation Delay, G, DIR to B Min Typ 17 16 17 16 23 34 25 37 Max 25 25 25 25 40 50 40 50 Min LS642 Typ 19 14 19 14 26 43 28 39 Max 25 25 25 25 40 60 40 60 Unit ns ns ns ns Test Conditions CL = 45 pF, RL = 667 FAST AND LS TTL DATA 5-3 |
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