74LS640

74LS640 MOTOROLA | Alldatasheet

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CONNECTION DIAGRAMS DIP (TOP VIEW) 18 17 16 15 14 13 1234 56 7 20 19 VCC DIR B1 B2 B3 B5 B4 B6 A1 A2 A3 A4 A5 A6 A7 91 0 A8 GND 12 11 B7 B8 18 17 16 15 14 13 1234 56 7 20 19 VCC DIR B1 B2 B3 B5 B4 B6 A1 A2 A3 A4 A5 A6 A7 91 0 A8 GND 12 11 B7 B8 SN54/74LS640 SN54/74LS642 SN54/74LS641 SN54/74LS645 ENABLE G ENABLE G 5-1 FAST AND LS TTL DATA 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 transmis- sion 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 OUTPUT LOGIC LS640 3-State Inverting LS641 Open-Collector True LS642 Open-Collector Inverting LS645 3-State True FUNCTION TABLE CONTROL INPUTS OPERATION INPUTS LS640 LS641 G DIR LS640 LS642 LS641 LS645 L L B data to A bus B data to A bus L H A data to B bus A data to B bus H X Isolation Isolation H = HIGH Level, L = LOW Level, X = Irrelevant SN54/74LS640 SN54/74LS641 SN54/74LS642 SN54/74LS645 OCTAL BUS TRANSCEIVERS LOW POWER SCHOTTKY

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SN54/74LS640 • SN54/74LS645 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 –55 125 IOH Output Current — High 54, 74 –3.0 mAOH pg –12 –15 mA IOL Output Current — Low 54 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Sb l P Limits Ui T C di iSymbol Parameter Min Typ Max Unit Test Conditions VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 54 0.5 V Guaranteed Input LOW Voltage forVIL Input LOW Voltage 74 0.6 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA VOH Output HIGH Voltage 54, 74 2.4 3.4 V VCC = MIN, IOH = 3.0 mA VOH O utput HIGH Voltage 54, 74 2.0 V VCC = MIN, IOH = MAX VOL Output LOW Voltage 54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN, VIN =V ILor VIHVOL O utput LOW Voltage 74 0.35 0.5 V IOL = 24 mA VIN = VIL or VIH per Truth Table IOZH Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V IOZL Output Off Current LOW –400 µA VCC = MAX, VOUT = 0.4 V I I HIGH C A or B, DIR or G 20 µA VCC = MAX, VIN = 2.7 V IIH Input HIGH Current DIR or G 0.1 mA VCC = MAX, VIN = 7.0 VIH p A or B 0.1 mA VCC = MAX, VIN = 5.5 V IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V IOS Output Short Circuit Current (Note 1)–40 –225 mA VCC = MAX I Power Supply Current Total Output HIGH 70 mA V MAXICC Total, Output LOW 90 mA VCC = MAX 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) Sb l P Limits Ui T C di iSb l P LS640 LS645 Ui T C di iSymbol Parameter Min Typ Max Min Typ Max Unit Test Conditions tPLH tPHL Propagation Delay A to B 6.0 8.0 8.0 ns C4 5 F tPLH tPHL Propagation Delay B to A 6.0 8.0 8.0 ns C L = 45 pF, tPZL tPZH Output Enable Time G , DIR to A ns C L 45 pF, R L = 667 Ω tPZL tPZH Output Enable Time G , DIR to B ns tPLZ tPHZ Output Disable Time G , DIR to A ns C L =50p F tPLZ tPHZ Output Disable Time G , DIR to B ns C L = 5.0 pF

SN54/74LS641 • SN54/74LS642 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 –55 125 VOH Output Current — High 54, 74 5.5 V IOL Output Current — Low 54 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Sb l P Limits Ui T C di iSymbol Parameter Min Typ Max Unit Test Conditions VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 54 0.5 V Guaranteed Input LOW Voltage forVIL Input LOW Voltage 74 0.6 V pg All Inputs VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA IOH Output HIGH Current 54, 74 100 µA VCC = MIN, VOH = MAX VOL Output LOW Voltage 54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN, VIN =V ILor VIHVOL O utput LOW Voltage 74 0.35 0.5 V IOL = 24 mA VIN = VIL or VIH per Truth Table IIH Input HIGH Current 20 µA VCC = MAX, VIN = 2.7 V IIH Input HIGH C urrent –0.1 mA VCC = MAX, VIN = 7.0 V IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V I Power Supply Current Total, Output HIGH 70 mA V MAXICC Total, Output LOW 90 mA VCC = MAX Total at HIGH Z 95 AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Sb l P Limits Ui T C di iSb l P LS641 LS642 Ui T C di iSymbol Parameter Min Typ Max Min Typ Max Unit Test Conditions tPLH tPHL Propagation Delay, A to B ns C4 5 F tPLH tPHL Propagation Delay, B to A ns C L = 45 pF, tPLH tPHL Propagation Delay, G , DIR to A ns L p, R L = 667 Ω tPLH tPHL Propagation Delay, G , DIR to B ns