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SN74LS645 Dataheets PDF



Part Number SN74LS645
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Octal Bus Transceivers
Datasheet SN74LS645 DatasheetSN74LS645 Datasheet (PDF)

SN74LS640, SN74LS641, SN74LS642, SN74LS645 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 L.

  SN74LS645   SN74LS645


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SN74LS640, SN74LS641, SN74LS642, SN74LS645 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 CONTROL INPUTS G DIR FUNCTION TABLE OPERATION 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 GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645) Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C IOH Output Current − High −3.0 mA −15 mA IOL Output Current − Low 24 mA GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642) Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C VOH Output Voltage − High IOL Output Current − Low 5.5 V 24 mA 20 1 http://onsemi.com LOW POWER SCHOTTKY MARKING DIAGRAMS SN74LS64xN AWLYYWW 1 PDIP−20 N SUFFIX CASE 738 20 1 LS64y AWLYYWW 1 SOIC−20 DW SUFFIX CASE 751D 20 1 1 1 SOEIAJ−20 M SUFFIX CASE 967 74LS64y AWLYWW x = 0, 1, 2, or 5 y = 0, 1, or 2 A = Assembly Location WL = Wafer Lot Y, YY= Year WW = Work Week ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 5 of this data sheet. © Semiconductor Components Industries, LLC, 2006 1 July, 2006 − Rev. 11 Publication Order Number: SN74LS640/D SN74LS640, SN74LS641, SN74LS642, SN74LS645 CONNECTION DIAGRAMS DIP (TOP VIEW) ENABLE VCC G B1 B2 B3 B4 B5 B6 B7 B8 20 19 18 17 16 15 14 13 12 11 ENABLE VCC G B1 B2 B3 B4 B5 B6 B7 B8 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 DIR A1 A2 A3 A4 A5 A6 A7 A8 GND Figure 1. SN74LS640 SN74LS642 1 2 3 4 5 6 7 8 9 10 DIR A1 A2 A3 A4 A5 A6 A7 A8 GND Figure 2. SN74LS641 SN74LS645 http://onsemi.com 2 SN74LS640, SN74LS641, SN74LS642, SN74LS645 SN74LS640 • SN74LS645 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH Parameter Input HIGH Voltage Min Typ Max Unit Test Conditions 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 0.6 V Guaranteed Input LOW Voltage for All Inputs VIK VOH VOL IOZH IOZL IIH IIL IOS ICC Input Clamp Diode Voltage −0.65 −1.5 V VCC = MIN, IIN = − 18 mA Output HIGH Voltage 2.4 3.4 2.0 V VCC = MIN, IOH = 3.0 mA V VCC = MIN, IOH = MAX Output LOW Voltage 0.25 0.4 0.35 0.5 V IOL = 12 mA V IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table Output Off Current HIGH 20 μA VCC = MAX, VOUT = 2.7 V Output Off Current LOW − 400 μA VCC = MAX, VOUT = 0.4 V A or B, DIR or G 20 μA VCC = MAX, VIN = 2.7 V Input HIGH Current DIR or G 0.1 mA VCC = MAX, VIN = 7.0 V A or B 0.1 mA VCC = MAX, VIN = 5.5 V Input LOW Current − 0.4 mA VCC = MAX, VIN = 0.4 V Output Short Circuit Current (Note 1) − 40 − 225 mA VCC = MAX Power Supply Current Total Output HIGH Total, Output LOW 70 90 mA VCC = MAX Total at HIGH Z 95 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 LS640 LS645 Symbol Parameter Min Typ Max Min Typ Max Unit tPLH Propagation Delay tPHL A to B 6.0 10 8.0 15 8.0 15 11 15 ns tPLH Propagation Delay tPHL B to A 6.0 10 8.0 15 8.0 15 11 15 ns tPZL Output Enable Time tPZH G, DIR to A 31 40 23 40 31 26 40 40 ns tPZL Output Enable Time tPZH G, DIR to B 31 40 23 40 31 26 40 40 ns tPLZ Output Disable Time tPHZ G, DIR to A 15 25 15 25 15 15 25 25 ns tPLZ Output Disable Time tPHZ G, DIR to B 15 25 15 25 15 15 25 25 ns Test Conditions CL = 45 pF, RL = 667 Ω CL = 5.0 pF http://onsemi.com 3 SN74LS640, SN74LS641, SN74LS642, SN74LS645 SN74LS641 • SN74LS642 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH Parameter Input HIGH Voltage Min Typ Max Unit Test Conditions 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 0.6 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage IOH Output HIGH Current VOL Output LOW Voltage IIH Input HIGH Current IIL Input LOW Current Power Supply Current Total, Output HIGH ICC Total, Output LOW −0.65 −1.5 V VCC = MIN, IIN = − 18 mA 100 μA VCC = MIN, VOH = MAX 0.25 0.4 0.35 0.5 V IOL = 12 mA V IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table 20 μA.


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