SN74LS640 Datasheet, PDF (1/8 Pages) ON Semiconductor – LOW POWER SCHOTTKY

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
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
V_CC
Supply Voltage
T_A
Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0
25
70
°C
I_OH
Output Current – High
– 3.0 mA
– 15 mA
I_OL
Output Current – Low
24
mA
GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642)
Symbol
Parameter
Min Typ Max Unit
V_CC
Supply Voltage
T_A
Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0
25
70
°C
V_OH
Output Voltage – High
I_OL
Output Current – Low
5.5
V
24
mA
© Semiconductor Components Industries, LLC, 1999
1
December, 1999 – Rev. 6
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