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  ON Semiconductor Electronic Components Datasheet  

SN74LS640 Datasheet

Octal Bus Transceivers

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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
http://onsemi.com
LOW
POWER
SCHOTTKY
CONTROL
INPUTS
G DIR
FUNCTION TABLE
OPERATION
LS640
LS642
LS641
LS645
LL
B data to A bus
B data to A bus
LH
A data to B bus
A data to B bus
HX
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
– 15
mA
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
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
20
1
PLASTIC
N SUFFIX
CASE 738
20
1
SOIC
DW SUFFIX
CASE 751D
ORDERING INFORMATION
Device
Package
Shipping
SN74LS640N 16 Pin DIP 1440 Units/Box
SN74LS640DW 16 Pin
2500/Tape & Reel
SN74LS641N 16 Pin DIP 1440 Units/Box
SN74LS641DW 16 Pin
2500/Tape & Reel
SN74LS642N 16 Pin DIP 1440 Units/Box
SN74LS642DW 16 Pin
2500/Tape & Reel
SN74LS645N 16 Pin DIP 1440 Units/Box
SN74LS645DW 16 Pin
2500/Tape & Reel
Publication Order Number:
SN74LS640/D


  ON Semiconductor Electronic Components Datasheet  

SN74LS640 Datasheet

Octal Bus Transceivers

No Preview Available !

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
SN74LS640
SN74LS642
1 2 3 4 5 6 7 8 9 10
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
SN74LS641
SN74LS645
http://onsemi.com
2


Part Number SN74LS640
Description Octal Bus Transceivers
Maker ON Semiconductor
Total Page 8 Pages
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