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SN74LS640 Datasheet PDF : 8 Pages
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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
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