IN74AC640 查看數據表（PDF） - IK Semicon Co., Ltd
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IN74AC640 Datasheet PDF : 6 Pages
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TECHNICAL DATA
Octal 3-State Inverting
Bus Transceiver
High-Speed Silicon-Gate CMOS
IN74AC640
The IN74AC640 is identical in pinout to the LS/ALS640, HC/HCT640.
The device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALS outputs.
The IN74AC640 is a 3-state transceiver that is used for 2-way
asynchronous communication between data buses. The device has an
active-low Output Enable pin, which is used to place the I/O ports into
high-impedance states. The Direction control determines whether data
flows from A to B or from B to A.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA; o.1 µA @ 25°C
• High Noise Immunity Characteristic of CMOS Devices
• Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74AC640N Plastic
IN74AC640DW SOIC
TA = -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 20=VCC
PIN 10 = GND
FUNCTION TABLE
Control Inputs
Output Direction
Enable
L
L
L
H
H
X
X = don’t care
Operation
Data Transmitted
from Bus B to
Bus A (inverted)
Data Transmitted
from Bus A to
Bus B (inverted)
Buses Isolated
(High Impedance
State)
Rev. 00
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