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 http://onsemi.com LOW POWER SCHOTTKY LOGIC Inverting True Inverting True FUNCTION TABLE CONTROL INPUTS 20 OPERATION 1 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 G PLASTIC N SUFFIX CASE 738 H = HIGH Level, L = LOW Level, X = Irrelevant 20 GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645) Symbol VCC Parameter Supply Voltage TA Operating Ambient Temperature Range IOH Output Current – High IOL Output Current – Low Min Typ Max Unit 4.75 5.0 5.25 V 0 25 70 °C – 3.0 mA – 15 mA 24 mA GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642) Symbol VCC TA Parameter Supply Voltage Operating Ambient Temperature Range Min Typ Max Unit 4.75 5.0 5.25 V 0 25 70 °C 1 SOIC DW SUFFIX CASE 751D ORDERING INFORMATION Device SN74LS640N SN74LS640DW SN74LS641N VOH Output Voltage – High 5.5 V IOL Output Current – Low 24 mA SN74LS641DW SN74LS642N SN74LS642DW SN74LS645N SN74LS645DW Semiconductor Components Industries, LLC, 1999 December, 1999 – Rev. 6 1 Package Shipping 16 Pin DIP 1440 Units/Box 16 Pin 2500/Tape & Reel 16 Pin DIP 1440 Units/Box 16 Pin 2500/Tape & Reel 16 Pin DIP 1440 Units/Box 16 Pin 2500/Tape & Reel 16 Pin DIP 1440 Units/Box 16 Pin 2500/Tape & Reel Publication Order Number: SN74LS640/D SN74LS640 SN74LS641 SN74LS642 SN74LS645 CONNECTION DIAGRAMS DIP (TOP VIEW) ENABLE B1 VCC G B2 B3 B4 B5 B6 B7 B8 VCC ENABLE B1 G B2 B3 B4 B5 B6 B7 B8 20 19 18 17 16 15 14 13 12 11 20 19 18 17 16 15 14 13 12 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 SN74LS640 SN74LS642 SN74LS641 SN74LS645 http://onsemi.com 2 SN74LS640 SN74LS641 SN74LS642 SN74LS645 SN74LS640 • SN74LS645 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH O Min Typ Max 2.0 0.6 – 0.65 2.4 Output HIGH Voltage – 1.5 3.4 2.0 Unit Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = – 18 mA V VCC = MIN, IOH = 3.0 mA V VCC = MIN, IOH = MAX 0.25 0.4 V IOL = 12 mA 0.35 0.5 V IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VOL O Output LOW Voltage 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 A or B, DIR or G 20 µA VCC = MAX, VIN = 2.7 V DIR or G 0.1 mA VCC = MAX, VIN = 7.0 V IIH Input HIGH Current IIL Input LOW Current IOS Output Short Circuit Current (Note 1) A or B ICC – 40 0.1 mA VCC = MAX, VIN = 5.5 V – 0.4 mA VCC = MAX, VIN = 0.4 V – 225 mA VCC = MAX mA VCC = MAX 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) Limits LS640 Symbol Parameter Min LS645 Typ Max Min Typ Max Unit tPLH tPHL Propagation Delay A to B 6.0 8.0 10 15 8.0 11 15 15 ns tPLH tPHL Propagation Delay B to A 6.0 8.0 10 15 8.0 11 15 15 ns tPZL tPZH Output Enable Time G, DIR to A 31 23 40 40 31 26 40 40 ns tPZL tPZH Output Enable Time G, DIR to B 31 23 40 40 31 26 40 40 ns tPLZ tPHZ Output Disable Time G, DIR to A 15 15 25 25 15 15 25 25 ns tPLZ tPHZ Output Disable Time G, DIR to B 15 15 25 25 15 15 25 25 ns http://onsemi.com 3 Test Conditions CL = 45 pF, RL = 667 Ω 0 pF CL = 5 5.0 SN74LS640 SN74LS641 SN74LS642 SN74LS645 SN74LS641 • SN74LS642 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage IOH Output HIGH Current VOL O Output LOW Voltage IIH Input HIGH Current IIL Input LOW Current ICC Min Parameter Typ Max Unit Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs – 1.5 V VCC = MIN, IIN = – 18 mA 100 µA VCC = MIN, VOH = MAX 0.25 0.4 V IOL = 12 mA 0.35 0.5 V IOL = 24 mA 20 µA VCC = MAX, VIN = 2.7 V –0.1 mA VCC = MAX, VIN = 7.0 V – 0.4 mA VCC = MAX, VIN = 0.4 V mA A VCC = MAX 2.0 0.6 – 0.65 Power Supply Current Total, Output HIGH 70 Total, Output LOW 90 Total at HIGH Z 95 VCC = VCC MIN, VIN = VIL or VIH per Truth Table AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits LS641 Symbol Parameter LS642 Typ Max Typ Max Unit tPLH tPHL Propagation Delay, A to B 17 16 25 25 19 14 25 25 ns tPLH tPHL Propagation Delay, B to A 17 16 25 25 19 14 25 25 ns tPLH tPHL Propagation Delay, G, DIR to A 23 34 40 50 26 43 40 60 ns tPLH tPHL Propagation Delay, G, DIR to B 25 37 40 50 28 39 40 60 ns Min Min http://onsemi.com 4 Test Conditions CL = 45 pF, RL = 667 Ω SN74LS640 SN74LS641 SN74LS642 SN74LS645 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 738–03 ISSUE E –A– 20 11 1 10 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. B L C –T– K SEATING PLANE M N E G F J D 0.25 (0.010) 20 PL 0.25 (0.010) 20 PL M T A M http://onsemi.com 5 M T B M DIM A B C D E F G J K L M N INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0_ 15 _ 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01 SN74LS640 SN74LS641 SN74LS642 SN74LS645 PACKAGE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751D–05 ISSUE F q A 20 X 45 _ M E h 0.25 1 10 20X B B 0.25 M T A S B S A L H 10X NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT MAXIMUM MATERIAL CONDITION. 11 B M D 18X e A1 SEATING PLANE DIM A A1 B C D E e H h L q C T http://onsemi.com 6 MILLIMETERS MIN MAX 2.35 2.65 0.10 0.25 0.35 0.49 0.23 0.32 12.65 12.95 7.40 7.60 1.27 BSC 10.05 10.55 0.25 0.75 0.50 0.90 0_ 7_ SN74LS640 SN74LS641 SN74LS642 SN74LS645 Notes http://onsemi.com 7 SN74LS640 SN74LS641 SN74LS642 SN74LS645 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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