74LVC244A
OCTAL BUFFER/LINE DRIVER WITH 3 STATE OUTPUTS
Description
The 74LVC244A provides two 4-bit line drivers with separate output-
enable (OE) inputs. When OE is low, the device passes data from the
A inputs to the Y outputs. When OE is high, the outputs are in the
high-impedance state.
The device is designed for operation with a power supply range of
1.65V to 3.6V.
Pin Assignments
NEW PRODUCT
The inputs are tolerant to 5.5V allowing this device to be used in a
mixed voltage environment. The device is fully specified for partial
power down applications using I
OFF
. The I
OFF
circuitry disables the
output preventing damaging current backflow when the device is
powered down.
Features
•
•
•
•
•
•
•
•
•
•
Supply Voltage Range from 1.65V to 3.6V
Sinks or Sources 24ma at V
CC
= 3V
CMOS Low Power Consumption
I
OFF
Supports Partial - Power Down Operation
Inputs or Outputs Accept up to 5.5V
Inputs can be Driven by 3.3V or 5V Allowing for Mixed Voltage
Applications
Schmitt Trigger Action at All Inputs
Typical V
OLP
(Quiet Output Ground Bounce) Less than 0.8V with
V
CC
= 3.3V and T
A
= +25°C
Typical V
OHV
(Quiet Output Dynamic VOH) Greater than 2.0V
with V
CC
= 3.3V and T
A
= +25°C
ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115)
Exceeds 2000-V Human Body Model (A114)
Exceeds 1000-V Charged Device Model (C101)
•
•
Latch-Up Exceeds 250mA per JESD 78, Class I
All devices are:
Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen and Antimony free,
"Green" and Lead-Free.
3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Applications
•
•
•
•
General Purpose Logic
Bus Driving
Power Down Signal Isolation
Wide array of products such as:
PCs, Notebooks, Netbooks, Ultrabooks
Networking Computer Peripherals, Hard Drives, CD/DVD
ROM
TV, DVD, DVR, Set Top Box
74LVC244A
Document number: DS35888 Rev. 1 - 2
1 of 10
www.diodes.com
July 2014
© Diodes Incorporated
74LVC244A
Absolute Maximum Ratings
(Notes 6 & 7)
Symbol
ESD HBM
ESD CDM
ESD MM
V
CC
V
I
I
IK
Description
Human Body Model ESD Protection
Charged Device Model ESD Protection
Machine Model ESD Protection
Supply Voltage Range
Input Voltage Range
Input Clamp Current V
I
< 0V
Output Clamp Current V
O
< 0V
Continuous Output Current -0.5V < V
O
V
CC
+0.5V
Continuous Current Through V
CC
Continuous Current Through GND
Operating Junction Temperature
Storage Temperature
Total Power Dissipation
Rating
2
1
200
-0.5 to +7.0
-0.5 to +7.0
-20
-50
±50
100
-100
-40 to +150
-65 to +150
500
Unit
kV
kV
V
V
V
mA
mA
mA
mA
mA
°C
°C
mW
NEW PRODUCT
I
OK
I
O
I
CC
I
GND
T
J
T
STG
P
TOT
Notes:
6. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be
within recommend values.
7. Forcing the maximum allowed voltage could cause a condition exceeding the maximum current or conversely forcing the maximum current could
cause a condition exceeding the maximum voltage. The ratings of both current and voltage must be maintained within the controlled range.
Recommended Operating Conditions
(Note 8)
Symbol
V
CC
V
I
V
O
Parameter
Supply Voltage
Input Voltage
Output Voltage
Conditions
Operating
Data Retention Only
—
—
V
CC
= 1.65V
I
OH
High-Level Output Current
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 1.65V
I
OL
Low-Level Output Current
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
∆t/∆V
T
A
Note:
Min
1.65
1.5
0
0
—
—
—
—
—
—
—
—
—
-40
Max
3.6
—
5.5
V
CC
-4
-8
-12
-24
4
8
12
24
10
+125
Unit
V
V
V
V
mA
mA
Input Transition Rise or Fall Rate
Operating Free-Air Temperature
8. Unused inputs should be held at V
CC
or ground.
ns/V
°C
74LVC244A
Document number: DS35888 Rev. 1 - 2
3 of 10
www.diodes.com
July 2014
© Diodes Incorporated
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