SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414U NOVEMBER 1992 REVISED AUGUST 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Operates From 1.65 V to 3.6 V
D
Inputs Accept Voltages to 5.5 V
D
Max t
pd
of 5.9 ns at 3.3 V
D
Typical V
OLP
(Output Ground Bounce)
<0.8 V at V
CC
= 3.3 V, T
A
= 25
C
D
Typical V
OHV
(Output V
OH
Undershoot)
>2 V at V
CC
= 3.3 V, T
A
= 25
C
D
Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V V
CC
)
D
I
off
Supports Partial-Power-Down Mode
Operation
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
D
ESD Protection Exceeds JESD 22
2000-V Human-Body Model (A114-A)
200-V Machine Model (A115-A)
1000-V Charged-Device Model (C101)
description/ordering information
This octal buffer/line driver is operational at 1.5-V
to 3.6-V V
CC
, but is designed specifically for
1.65-V to 3.6-V V
CC
operation.
The SN74LVC244A is organized as 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.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
40 C to 85 C
PDIP N
Tube of 20
SN74LVC244AN
SN74LVC244AN
40 C to 85 C
QFN RGY
Reel of 1000
SN74LVC244ARGYR
LC244A
40 C to 85 C
SOIC DW
Tube of 25
SN74LVC244ADW
LVC244A
40 C to 85 C
SOIC DW
Reel of 2000
SN74LVC244ADWR
LVC244A
40 C to 85 C
SOP NS
Reel of 2000
SN74LVC244ANSR
LVC244A
40
C to 85
C
SSOP DB
Reel of 2000
SN74LVC244ADBR
LC244A
40
C to 85
C
TSSOP PW
Tube of 70
SN74LVC244APW
LC244A
TSSOP PW
Reel of 2000
SN74LVC244APWR
LC244A
Reel of 250
SN74LVC244APWT
TVSOP DGV
Reel of 2000
SN74LVC244ADGVR
LC244A
VFBGA GQN
Reel of 1000
SN74LVC244AGQNR
LC244A
VFBGA ZQN (Pb-Free)
Reel of 1000
SN74LVC244AZQNR
LC244A
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available
at www.ti.com/sc/package.
Copyright
2003, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
DB, DGV, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
RGY PACKAGE
(TOP VIEW)
1
20
10
11
2
3
4
5
6
7
8
9
19
18
17
16
15
14
13
12
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
1OE
2A1
V
GND
CC
SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414U NOVEMBER 1992 REVISED AUGUST 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator
in a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
terminal assignments
1
2
3
4
A
1A1
1OE
VCC
2OE
B
1A2
2A4
2Y4
1Y1
C
1A3
2Y3
2A3
1Y2
D
1A4
2A2
2Y2
1Y3
E
GND
2Y1
2A1
1Y4
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
OE
A
OUTPUT
Y
L
H
H
L
L
L
H
X
Z
logic diagram (positive logic)
1
2
18
1Y1
1OE
1A1
4
16
1Y2
1A2
6
14
1Y3
1A3
8
12
1Y4
1A4
19
11
9
2Y1
2OE
2A1
13
7
2Y2
2A2
15
5
2Y3
2A3
17
3
2Y4
2A4
Pin numbers shown are for the DB, DGV, DW, N, NS, PW, and RGY packages.
GQN OR ZQN PACKAGE
(TOP VIEW)
1
2
3
4
A
B
C
D
E
SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414U NOVEMBER 1992 REVISED AUGUST 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1)
0.5 V to 6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high-impedance or power-off state, V
O
(see Note 1)
0.5 V to 6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or low state, V
O
(see Notes 1 and 2)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0 )
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
100 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 3): DB package
70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): DGV package
92
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): GQN/ZQN package
78
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): NS package
60
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): PW package
83
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 4): RGY package
37
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The value of VCC is provided in the recommended operating conditions table.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
4. The package thermal impedance is calculated in accordance with JESD 51-5.
SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414U NOVEMBER 1992 REVISED AUGUST 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 5)
MIN
MAX
UNIT
VCC
Supply voltage
Operating
1.65
3.6
V
VCC
Supply voltage
Data retention only
1.5
V
V
High-level input voltage
VCC = 1.65 V to 1.95 V
0.65
VCC
V
VIH
High-level input voltage
VCC = 2.3 V to 2.7 V
1.7
V
IH
VCC = 2.7 V to 3.6 V
2
V
Low-level input voltage
VCC = 1.65 V to 1.95 V
0.35
VCC
V
VIL
Low-level input voltage
VCC = 2.3 V to 2.7 V
0.7
V
IL
VCC = 2.7 V to 3.6 V
0.8
VI
Input voltage
0
5.5
V
VO
Output voltage
High or low state
0
VCC
V
VO
Output voltage
3-state
0
5.5
V
I
High-level output current
VCC = 1.65 V
4
mA
IOH
High-level output current
VCC = 2.3 V
8
mA
IOH
High-level output current
VCC = 2.7 V
12
mA
VCC = 3 V
24
I
Low-level output current
VCC = 1.65 V
4
mA
IOL
Low-level output current
VCC = 2.3 V
8
mA
IOL
Low-level output current
VCC = 2.7 V
12
mA
VCC = 3 V
24
TA
Operating free-air temperature
40
85
C
NOTE 5: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414U NOVEMBER 1992 REVISED AUGUST 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
UNIT
V
IOH = 100
A
1.65 V to 3.6 V
VCC0.2
V
V
IOH = 4 mA
1.65 V
1.2
V
VOH
IOH = 8 mA
2.3 V
1.7
V
VOH
IOH = 12 mA
2.7 V
2.2
V
IOH = 12 mA
3 V
2.4
IOH = 24 mA
3 V
2.2
V
IOL = 100
A
1.65 V to 3.6 V
0.2
V
V
IOL = 4 mA
1.65 V
0.45
V
VOL
IOL = 8 mA
2.3 V
0.7
V
OL
IOL = 12 mA
2.7 V
0.4
IOL = 24 mA
3 V
0.55
II
VI = 0 to 5.5 V
3.6 V
5
A
Ioff
VI or VO = 5.5 V
0
10
A
IOZ
VO = 0 to 5.5 V
3.6 V
10
A
ICC
VI = VCC or GND
IO = 0
3.6 V
10
A
ICC
3.6 V
VI
5.5 V
IO = 0
3.6 V
10
A
ICC
One input at VCC 0.6 V,
Other inputs at VCC or GND
2.7 V to 3.6 V
500
A
Ci
VI = VCC or GND
3.3 V
4
pF
Co
VO = VCC or GND
3.3 V
5.5
pF
All typical values are at VCC = 3.3 V, TA = 25
C.
This applies in the disabled state only.
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 1.5 V
VCC = 1.8 V
0.15 V
VCC = 2.5 V
0.2 V
VCC = 2.7 V
VCC = 3.3 V
0.3 V
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
tpd
A
Y
1
14.9
1
10.9
1
7.9
1
6.9
1.5
5.9
ns
ten
OE
Y
1
18.3
1
12.6
1
9.6
1
8.6
1.5
7.6
ns
tdis
OE
Y
1
16.1
1
12.1
1
7.8
1
6.8
1.5
6.5
ns
operating characteristics, T
A
= 25
C
PARAMETER
TEST
VCC = 1.8 V VCC = 2.5 V VCC = 3.3 V
UNIT
PARAMETER
TEST
CONDITIONS
TYP
TYP
TYP
UNIT
Cpd
Power dissipation capacitance
Outputs enabled
f = 10 MHz
43
43
44
pF
Cpd
Power dissipation capacitance
per buffer/driver
Outputs disabled
f = 10 MHz
1
1
2
pF
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