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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
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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
PLASTIC N SUFFIX CASE 738
H = HIGH Level, L = LOW Level, X = Irrelevant 20
GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645)
Symbol VCC TA IOH Parameter Supply Voltage Operating Ambient Temperature Range Output Current - High Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 3.0 - 15 IOL Output Current - Low 24 Unit V C mA mA mA
1
SOIC DW SUFFIX CASE 751D
ORDERING INFORMATION
Device SN74LS640N SN74LS640DW SN74LS641N Package 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin Shipping 1440 Units/Box 2500/Tape & Reel 1440 Units/Box 2500/Tape & Reel 1440 Units/Box 2500/Tape & Reel 1440 Units/Box 2500/Tape & Reel
GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642)
Symbol VCC TA VOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Voltage - High Output Current - Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 5.5 24 Unit V C V mA
SN74LS641DW SN74LS642N SN74LS642DW SN74LS645N SN74LS645DW
(c) Semiconductor Components Industries, LLC, 1999
1
December, 1999 - Rev. 6
Publication Order Number: SN74LS640/D
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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 VCC 20 ENABLE B1 G 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
SN74LS640 SN74LS642
SN74LS641 SN74LS645
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SN74LS640 SN74LS641 SN74LS642 SN74LS645 SN74LS640 * SN74LS645
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VO OH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.4 2.0 0.25 VO OL IOZH IOZL IIH IIL IOS Output LOW Voltage 0.35 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 - 40 DIR or G A or B 0.5 20 - 400 20 0.1 0.1 - 0.4 - 225 70 90 95 mA VCC = MAX V A A A mA mA mA mA 0.4 - 0.65 3.4 Min 2.0 0.6 - 1.5 Typ Max Unit V V V V V 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
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)
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 5.0 ns Test Conditions
CL = 45 pF, RL = 667
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SN74LS640 SN74LS641 SN74LS642 SN74LS645 SN74LS641 * SN74LS642
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK IOH VO OL Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Current 0.25 Output LOW Voltage 0.35 IIH IIL 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 A VCC = MAX 0.5 20 V A mA mA IOL = 24 mA - 0.65 Min 2.0 0.6 - 1.5 100 0.4 Typ Max Unit V V V A 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 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 CL = 45 pF, RL = 667 Test Conditions
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SN74LS640 SN74LS641 SN74LS642 SN74LS645
PACKAGE DIMENSIONS
N SUFFIX PLASTIC PACKAGE CASE 738-03 ISSUE E
-A-
20 11 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. 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
B
1 10
C
L
-T-
SEATING PLANE
K M E G F D
20 PL
N J 0.25 (0.010)
M 20 PL
0.25 (0.010) TA
M
M
TB
M
DIM A B C D E F G J K L M N
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SN74LS640 SN74LS641 SN74LS642 SN74LS645
PACKAGE DIMENSIONS
D SUFFIX PLASTIC SOIC PACKAGE CASE 751D-05 ISSUE F
D A
11 X 45 _
q
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. 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_
H
M
B
M
20
10X
0.25
E
1
10
h
20X
B 0.25
M
B TA
S
B
S
A
SEATING PLANE
DIM A A1 B C D E e H h L
L
18X
e
A1
q
T
C
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SN74LS640 SN74LS641 SN74LS642 SN74LS645
Notes
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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. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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SN74LS640/D

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