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IN74AC640 Datasheet Preview

IN74AC640 Datasheet

Octal 3-State Inverting Bus Transceiver

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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
496
FUNCTION TABLE
Control Inputs
Output Direction
Enable
LL
LH
HX
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)




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IN74AC640 Datasheet Preview

IN74AC640 Datasheet

Octal 3-State Inverting Bus Transceiver

No Preview Available !

IN74AC640
MAXIMUM RATINGS*
Symbol
Parameter
Value
VCC
VIN
VOUT
IIN
IOUT
ICC
PD
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
-0.5 to +7.0
-0.5 to VCC +0.5
-0.5 to VCC +0.5
±20
±50
±50
750
500
Tstg Storage Temperature
-65 to +150
TL Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
260
*Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
Unit
V
V
V
mA
mA
mA
mW
°C
°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
VIN, VOUT
TJ
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Junction Temperature (PDIP)
TA Operating Temperature, All Package Types
IOH Output Current - High
IOL Output Current - Low
tr, tf Input Rise and Fall Time *
(except Schmitt Inputs)
* VIN from 30% to 70% VCC
VCC =3.0 V
VCC =4.5 V
VCC =5.5 V
Min Max Unit
2.0 6.0
V
0 VCC V
140 °C
-40 +85 °C
-24 mA
24 mA
0 150 ns/V
0 40
0 25
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range
GND(VIN or VOUT)VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.
497


Part Number IN74AC640
Description Octal 3-State Inverting Bus Transceiver
Maker ETC
Total Page 5 Pages
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