74LVC244A
Low-Voltage CMOS Octal
Buffer
With 5 V−Tolerant Inputs and Outputs
(3−State, Non−Inverting)
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The 74LVC244A is a high performance, non−inverting octal buffer
operating from a 1.2 to 3.6 V supply. High impedance TTL compatible
inputs significantly reduce current loading to input drivers while TTL
compatible outputs offer improved switching noise performance. A V
I
specification of 5.5 V allows 74LVC244A inputs to be safely driven
from 5 V devices. The 74LVC244A is suitable for memory address
driving and all TTL level bus oriented transceiver applications.
Current drive capability is 24 mA at the outputs. The Output Enable
(OE) input, when HIGH, disables the output by placing them in
a HIGH Z condition.
Features
TSSOP−20
DT SUFFIX
CASE 948E
QFN20
MN SUFFIX
CASE 485AA
QFN20
MN SUFFIX
CASE 485CB
MARKING DIAGRAMS
20
LVC
244A
ALYW
G
G
1
1
1
LVC
244A
ALYWG
G
QFN20 − 485AA
A
L
Y
W
G
244A
ALYWG
G
QFN20 − 485CB
•
•
•
•
•
•
Designed for 1.2 V to 3.6 V V
CC
Operation
5 V Tolerant − Interface Capability With 5 V TTL Logic
Supports Live Insertion and Withdrawal
I
OFF
Specification Guarantees High Impedance When V
CC
= 0 V
24 mA Output Sink and Source Capability
Near Zero Static Supply Current in All Three Logic States (10
mA)
Substantially Reduces System Power Requirements
•
ESD Performance:
♦
Human Body Model >2000 V
♦
Machine Model >200 V
•
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 7 of
this data sheet.
This document contains information on some products that are still under development.
ON Semiconductor reserves the right to change or discontinue these products without
notice.
©
Semiconductor Components Industries, LLC, 2016
1
February, 2016 − Rev. 1
Publication Order Number:
74LVC244A/D
74LVC244A
V
CC
20
2OE
19
1O0
18
2D0
17
1O1
16
2D1
15
1O2
14
2D2
13
1O3
12
2D3
11
1D0
2
18
1O0
1OE
1
1D1
4
16
1O1
1
1OE
2
1D0
3
2O0
19
4
1D1
5
2O1
6
1D2
7
2O2
8
1D3
12
9
2O3
10
GND
1D2
6
14
1O2
1D3
8
12
1O3
20
PIN #1
QFN
11
10
2OE
19
2D0
2
9
2D1
17
3
2O0
Figure 1. Pinout: 20−Lead
(Top View)
PIN NAMES
PINS
nOE
1Dn, 2Dn
1On, 2On
FUNCTION
Output Enable Inputs
Data Inputs
3−State Outputs
15
5
2O1
2D2
13
7
2O2
2D3
11
9
2O3
Figure 2. Logic Diagram
TRUTH TABLE
INPUTS
1OE
2OE
L
L
H
1Dn
2Dn
L
H
X
OUTPUTS
1On, 2On
L
H
Z
H = High Voltage Level
L = Low Voltage Level
Z = High Impedance State
X = High or Low Voltage Level and Transitions are Acceptable
For I
CC
reasons, DO NOT FLOAT Inputs
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2
74LVC244A
MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
Output in 3−State
Output in HIGH or LOW State
(Note 1)
I
IK
I
OK
DC Input Diode Current
DC Output Diode Current
V
I
< GND
V
O
< GND
V
O
> V
CC
I
O
I
CC
I
GND
T
STG
T
L
T
J
q
JA
MSL
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Storage Temperature Range
Lead Temperature, 1 mm from Case for
10 Seconds
Junction Temperature Under Bias
Thermal Resistance (Note 2)
Moisture Sensitivity
Level 1
Condition
Value
−0.5 to +6.5
−0.5
≤
V
I
≤
+6.5
−0.5
≤
V
O
≤
+6.5
−0.5
≤
V
O
≤
V
CC
+ 0.5
−50
−50
+50
±50
±100
±100
−65 to +150
T
L
= 260
T
J
= 135
110.7
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
°C
°C
°C
°C/W
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. I
O
absolute maximum rating must be observed.
2. Measured with minimum pad spacing on an FR4 board, using 10 mm−by−1 inch, 2 ounce copper trace no air flow.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
Supply Voltage
Operating
Functional
Input Voltage
Output Voltage
HIGH or LOW State
3−State
HIGH Level Output Current
V
CC
= 3.0 V − 3.6 V
V
CC
= 2.7 V − 3.0 V
LOW Level Output Current
V
CC
= 3.0 V − 3.6 V
V
CC
= 2.7 V − 3.0 V
Operating Free−Air Temperature
Input Transition Rise or Fall Rate
V
CC
= 1.65 V to 2.7 V
V
CC
= 2.7 V to 3.6 V
−40
0
0
Parameter
Min
1.65
1.2
0
0
0
Typ
Max
3.6
3.6
5.5
V
CC
5.5
mA
−24
−12
mA
24
12
+125
20
10
°C
ns/V
V
V
Units
V
V
I
V
O
I
OH
I
OL
T
A
Dt/DV
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
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3
74LVC244A
DC ELECTRICAL CHARACTERISTICS
−405C to +855C
Symbol
V
IH
Parameter
HIGH−level input
voltage
Conditions
V
CC
= 1.2 V
V
CC
= 1.65 V to 1.95 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 2.7 V to 3.6 V
V
IL
LOW−level input
voltage
V
CC
= 1.2 V
V
CC
= 1.65 V to 1.95 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 2.7 V to 3.6 V
V
OH
HIGH−level output
voltage
Min
1.08
0.65 x
V
CC
1.7
2.0
−
−
−
−
Typ
(Note 3)
−
−
−
−
−
−
−
−
Max
−
−
−
−
0.12
0.35 x
V
CC
0.7
0.8
−405C to +1255C
Min
1.08
0.65 x
V
CC
1.7
2.0
−
−
−
−
Typ
(Note 3)
−
−
−
−
−
−
−
−
Max
−
−
−
−
0.12
0.35 x
V
CC
0.7
0.8
V
−
−
−
−
−
−
−
−
−
−
−
−
V
CC
−
0.3
1.05
1.65
2.05
2.25
2.0
−
−
−
−
−
−
−
−
−
−
−
−
V
−
−
−
−
−
±0.1
±0.1
±0.1
0.1
5
0.2
0.45
0.6
0.4
0.55
±5
±5
±10
10
500
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
±0.1
±0.1
±0.1
0.1
5
0.3
0.65
0.8
0.6
0.8
±20
±20
±20
40
5000
mA
mA
mA
mA
mA
V
Unit
V
V
I
= V
IH
or V
IL
I
O
= −100
mA;
V
CC
= 1.65 V to 3.6 V
I
O
= −4 mA; V
CC
= 1.65 V
I
O
= −8 mA; V
CC
= 2.3 V
I
O
= −12 mA; V
CC
= 2.7 V
I
O
= −18 mA; V
CC
= 3.0 V
I
O
= −24 mA; V
CC
= 3.0 V
V
CC
−
0.2
1.2
1.8
2.2
2.4
2.2
V
OL
LOW−level output
voltage
V
I
= V
IH
or V
IL
I
O
= 100
mA;
V
CC
= 1.65 V to 3.6 V
I
O
= 4 mA; V
CC
= 1.65 V
I
O
= 8 mA; V
CC
= 2.3 V
I
O
= 12 mA; V
CC
= 2.7 V
I
O
= 24 mA; V
CC
= 3.0 V
−
−
−
−
−
−
−
−
−
−
I
I
I
OZ
I
OFF
I
CC
DI
CC
Input leakage current
OFF−state output
current
Power−off leakage
current
Supply current
Additional supply
current
V
I
= 5.5V or GND V
CC
= 3.6 V
VI = VIH or VIL;
V
O
= 5.5 V or GND; V
CC
= 3.6 V
V
I
or V
O
= 5.5 V; V
CC
= 0.0 V
V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 3.6 V
per input pin;
V
I
= V
CC
− 0.6 V; I
O
= 0 A;
V
CC
= 2.7 V to 3.6 V
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
3. All typical values are measured at T
A
= 25°C and V
CC
= 3.3 V, unless stated otherwise.
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74LVC244A
AC ELECTRICAL CHARACTERISTICS
(t
R
= t
F
= 2.5 ns)
−405C to +855C
Symbol
t
pd
Parameter
Propagation Delay (Note 5)
nDn to nOn
Conditions
V
CC
= 1.2 V
V
CC
= 1.65 V to 1.95 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 2.7 V
V
CC
= 3.0 V to 3.6 V
t
en
Enable Time (Note 6)
nOE to nOn
V
CC
= 1.2 V
V
CC
= 1.65 V to 1.95 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 2.7 V
V
CC
= 3.0 V to 3.6 V
t
dis
Disable Time (Note 7)
nOE to nOn
V
CC
= 1.2 V
V
CC
= 1.65 V to 1.95 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 2.7 V
V
CC
= 3.0 V to 3.6 V
t
sk(0)
Output Skew Time (Note 8)
Min
−
1.5
1.0
1.5
1.5
−
1.5
1.5
1.5
1.0
−
2.2
0.5
1.5
1.5
−
Typ
1
17.0
6.4
3.4
3.4
2.9
24.0
7.0
3.9
4.1
3.2
9.0
4.5
3.6
3.3
3.1
−
Max
−
13.7
7.1
6.9
5.9
−
17.3
9.5
8.6
7.6
−
9.8
5.5
6.8
5.8
1
−405C to +1255C
Min
−
1.5
1.0
1.5
1.5
−
1.5
1.5
1.5
1.0
−
2.2
0.5
1.5
1.5
−
Typ
1
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
Max
−
15.8
8.2
9.0
7.5
−
20.0
11.0
11.0
9.5
−
11.3
6.4
8.5
7.5
1.5
ns
ns
ns
Unit
ns
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
4. Typical values are measured at T
A
= 25°C and V
CC
= 3.3 V, unless stated otherwise.
5. t
pd
is the same as t
PLH
and t
PHL
.
6. t
en
is the same as t
PZL
and t
PZH
.
7. t
dis
is the same as t
PLZ
and t
PHZ
.
8. Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
DYNAMIC SWITCHING CHARACTERISTICS
T
A
= +25°C
Symbol
V
OLP
V
OLV
Characteristic
Dynamic LOW Peak Voltage (Note 9)
Dynamic LOW Valley Voltage (Note 9)
Condition
V
CC
= 3.3 V, C
L
= 50 pF, V
IH
= 3.3 V, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= 2.5 V, V
IL
= 0 V
V
CC
= 3.3 V, C
L
= 50 pF, V
IH
= 3.3 V, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= 2.5 V, V
IL
= 0 V
Min
Typ
0.8
0.6
−0.8
−0.6
Max
Unit
V
V
9. Number of outputs defined as “n”. Measured with “n−1” outputs switching from HIGH−to−LOW or LOW−to−HIGH. The remaining output is
measured in the LOW state.
CAPACITIVE CHARACTERISTICS
Symbol
C
IN
C
OUT
C
PD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
(Note 10)
Condition
V
CC
= 3.3 V, V
I
=
0
V or V
CC
V
CC
= 3.3 V, V
I
=
0
V or V
CC
Per input; V
I
= GND or V
CC
V
CC
= 1.65 V to 1.95 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 3.0 V to 3.6 V
10. C
PD
is used to determine the dynamic power dissipation (P
D
in
mW).
P
D
= C
PD
x V
CC2
x
fi x N +
S
(C
L
x
V
CC2
x
fo) where:
fi = input frequency in MHz; fo = output frequency in MHz
C
L
= output load capacitance in pF V
CC
= supply voltage in Volts
N = number of outputs switching
S(C
L
x V
CC2
x fo) = sum of the outputs.
6.4
9.6
12.5
Typical
4
5
Unit
pF
pF
pF
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