Texas Instruments SN74LVC244ADBLE, SN74LVC244ADBR, SN74LVC244ADGVR, SN74LVC244ADW, SN74LVC244ADWR Datasheet
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SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414L – NOVEMBER 1992 – REVISED APRIL 1999
D
EPIC
(Enhanced-Performance Implanted
CMOS) Submicron Process
D
Typical V
<0.8 V at V
D
T ypical V
at V
D
Power Off Disables Outputs, Permitting
= 3.3 V, TA = 25°C
CC
(Output Ground Bounce)
OLP
= 3.3 V, TA = 25°C
CC
(Output VOH Undershoot) >2 V
OHV
Live Insertion
D
Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V V
D
ESD Protection Exceeds 2000 V Per
CC
)
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
D
Package Options Include Shrink
Small-Outline (DB), Plastic Small-Outline
(DW), and Thin Shrink Small-Outline (PW)
Packages
description
DB, DW, OR PW PACKAGE
(TOP VIEW)
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
This octal buffer/line driver is operational at 1.5-V to 3.6-V VCC, but 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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
T o ensure the high-impedance state during power up or power down, OE
should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN74LVC244A is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each buffer)
INPUTS
OE A
L H H
L LL
HXZ
OUTPUT
Y
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.
EPIC is a trademark of 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1999, Texas Instruments Incorporated
1
SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414L – NOVEMBER 1992 – REVISED APRIL 1999
logic symbol
1OE
1A1
1A2
1A3
1A4
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
1
2
4
6
8
EN
18
16
14
12
1Y1
1Y2
1Y3
1Y4
2OE
2A1
2A2
2A3
2A4
logic diagram (positive logic)
1
1OE
218
1A1
416
1A2
1Y1
1Y2
2OE
2A1
2A2
19
11
13
15
17
19
11 9
13 7
EN
2Y1
2Y2
9
2Y1
7
2Y2
5
2Y3
3
2Y4
614
1A3
812
1A4
1Y3
1Y4
15 5
2A3
17 3
2A4
2Y3
2Y4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
Input voltage range, V
Voltage range applied to any output in the high-impedance or power-off state, V
(see Note 1) –0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or low state, V
(see Notes 1 and 2) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
Output clamp current, I
Continuous output current, I
Continuous current through V
Package thermal impedance, θ
Storage temperature range, T
‡
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.
–0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 1) –0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
O
O
(VI < 0 ) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
(VO < 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OK
±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
or GND ±100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 3): DB package 115°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
DW package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 128°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
‡
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
VCCSuppl
oltage
V
VOOutput voltage
V
IOHHigh-level output current
mA
IOLLow-level output current
mA
SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414L – NOVEMBER 1992 – REVISED APRIL 1999
recommended operating conditions (see Note 4)
MIN MAX UNIT
pp
y v
V
V
V
T
NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
High-level input voltage
IH
Low-level input voltage
IL
Input voltage 0 5.5 V
I
p
p
p
Operating free-air temperature –40 85 °C
A
Implications of Slow or Floating CMOS Inputs
, literature number SCBA004.
Operating 1.65 3.6
Data retention only 1.5
VCC = 1.65 V to 1.95 V 0.65 × V
VCC = 2.3 V to 2.7 V
VCC = 2.7 V to 3.6 V 2
VCC = 1.65 V to 1.95 V 0.35 × V
VCC = 2.3 V to 2.7 V 0.7
VCC = 2.7 V to 3.6 V 0.8
High or low state 0 V
3 state 0 5.5
VCC = 1.65 V –4
VCC = 2.3 V –8
VCC = 2.7 V –12
VCC = 3 V –24
VCC = 1.65 V 4
VCC = 2.3 V 8
VCC = 2.7 V 12
VCC = 3 V 24
CC
1.7
CC
V
CC
V
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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