SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS
SCAS218R - JANUARY 1993 - 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 6.3 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
I
off
Supports Partial-Power-Down Mode
Operation
D
Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V V
CC
)
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
D
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)
description/ordering information
This octal bus transceiver is designed for 1.65-V
to 3.6-V V
CC
operation.
The SN74LVC245A is designed for asynchronous
communication between data buses. The device
transmits data from the A bus to the B bus or from
the B bus to the A bus, depending on the logic level
at the direction-control (DIR) input. The
output-enable (OE) input can be used to disable
the device so the buses are effectively isolated.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP - N
Tube of 20
SN74LVC245AN
SN74LVC245AN
QFN - RGY
Reel of 1000
SN74LVC245ARGYR
LC245A
SOIC - DW
Tube of 25
SN74LVC245ADW
LVC245A
SOIC - DW
Reel of 2000
SN74LVC245ADWR
LVC245A
SOP - NS
Reel of 2000
SN74LVC245ANSR
LVC245A
-40
C to 85
C
SSOP - DB
Reel of 2000
SN74LVC245ADBR
LC245A
-40
C to 85
C
Tube of 70
SN74LVC245APW
TSSOP - PW
Reel of 2000
SN74LVC245APWR
LC245A
TSSOP - PW
Reel of 250
SN74LVC245APWT
LC245A
TVSOP - DGV
Reel of 2000
SN74LVC245ADGVR
LC245A
VFBGA - GQN
Reel of 1000
SN74LVC245AGQNR
LC245A
VFBGA - ZQN (Pb-Free)
Reel of 1000
SN74LVC245AZQNR
LC245A
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
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
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
OE
B1
B2
B3
B4
B5
B6
B7
A1
A2
A3
A4
A5
A6
A7
A8
DIR
B8
V
GND
CC
SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS
SCAS218R - JANUARY 1993 - REVISED AUGUST 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
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.
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.
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
A1
DIR
VCC
OE
B
A3
B2
A2
B1
C
A5
A4
B4
B3
D
A7
B6
A6
B5
E
GND
A8
B8
B7
FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
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
SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS
SCAS218R - JANUARY 1993 - 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
76
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.
SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS
SCAS218R - JANUARY 1993 - 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
VCC = 1.65 V to 1.95 V
0.65
VCC
VIH
High-level input voltage
VCC = 2.3 V to 2.7 V
1.7
V
VIH
High-level input voltage
VCC = 2.7 V to 3.6 V
2
V
VCC = 1.65 V to 1.95 V
0.35
VCC
VIL
Low-level input voltage
VCC = 2.3 V to 2.7 V
0.7
V
VIL
Low-level input voltage
VCC = 2.7 V to 3.6 V
0.8
V
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
VCC = 1.65 V
-4
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
VCC = 1.65 V
4
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
t/
v
Input transition rise or fall rate
10
ns/V
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.
SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS
SCAS218R - JANUARY 1993 - 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
IOH = -100
A
1.65 V to 3.6 V
VCC-0.2
IOH = -4 mA
1.65 V
1.2
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
IOL = 100
A
1.65 V to 3.6 V
0.2
IOL = 4 mA
1.65 V
0.45
VOL
IOL = 8 mA
2.3 V
0.7
V
VOL
IOL = 12 mA
2.7 V
0.4
V
IOL = 24 mA
3 V
0.55
II
Control inputs
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
Control inputs
VI = VCC or GND
3.3 V
4
pF
Cio
A or B ports
VO = VCC or GND
3.3 V
5.5
pF
All typical values are at VCC = 3.3 V, TA = 25
C.
For I/O ports, the parameter IOZ includes the input leakage current.
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 = 1.8 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
UNIT
tpd
A or B
B or A
1
12.7
1
8.3
7.3
1.5
6.3
ns
ten
OE
A or B
1
15.3
1
10.5
9.5
1.5
8.5
ns
tdis
OE
A or B
1
17
1
9.5
8.5
1.7
7.5
ns
tsk(o)
1
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
42
43
45
pF
Cpd
Power dissipation capacitance
per transceiver
Outputs disabled
f = 10 MHz
1
1
2
pF
PDF 
ZIP