SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCES008N - JULY 1995 - REVISED AUGUST 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Operate 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
Support 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
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
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)
SN74LVCH245A . . . 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
G
ND
CC
SN54LVCH245A . . . J OR W PACKAGE
SN74LVCH245A . . . DB, DGV, DW, NS,
OR PW PACKAGE
(TOP VIEW)
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
SN54LVCH245A . . . FK PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
A2
A1
DIR
B7
B6
OE
A8
GND
B8
V
CC
description/ordering information
The SN54LVCH245A octal bus transceiver is designed for 2.7-V to 3.6-V V
CC
operation, and the
SN74LVCH245A octal bus transceiver is designed for 1.65-V to 3.6-V V
CC
operation.
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.
These devices are fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
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.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup
or pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
These devices are designed for asynchronous communication between data buses. These devices transmit
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.
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.
On products compliant to MIL PRF 38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCES008N - JULY 1995 - REVISED AUGUST 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE MARKING
QFN - RGY
Reel of 1000
SN74LVCH245ARGYR
LCH245A
SOIC - DW
Tube of 25
SN74LVCH245ADW
LVCH245A
SOIC - DW
Reel of 2000
SN74LVCH245ADWR
LVCH245A
SOP - NS
Reel of 2000
SN74LVCH245ANSR
LVCH245A
SSOP - DB
Reel of 2000
SN74LVCH245ADBR
LCH245A
-40
C to 85
C
Tube of 70
SN74LVCH245APW
-40 C to 85 C
TSSOP - PW
Reel of 2000
SN74LVCH245APWR
LCH245A
TSSOP - PW
Reel of 250
SN74LVCH245APWT
LCH245A
TVSOP - DGV
Reel of 2000
SN74LVCH245ADGVR
LCH245A
VFBGA - GQN
Reel of 1000
SN74LVCH245AGQNR
LCH245A
VFBGA - ZQN (Pb-free)
Reel of 1000
SN74LVCH245AZQNR
LCH245A
CDIP - J
Tube of 20
SNJ54LVCH245AJ
SNJ54LVCH245AJ
-55
C to 125
C
CFP - W
Tube of 85
SNJ54LVCH245AW
SNJ54LVCH245AW
-55 C to 125 C
LCCC - FK
Tube of 55
SNJ54LVCH245AFK
SNJ54LVCH245AFK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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
GQN OR ZQN PACKAGE
(TOP VIEW)
1
2
3
4
A
B
C
D
E
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCES008N - JULY 1995 - REVISED AUGUST 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
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): 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.
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCES008N - JULY 1995 - REVISED AUGUST 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 5)
SN54LVCH245A
SN74LVCH245A
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
Operating
2
3.6
1.65
3.6
V
VCC
Supply voltage
Data retention only
1.5
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
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
0.8
V
VI
Input voltage
0
5.5
0
5.5
V
VO
Output voltage
High or low state
0
VCC
0
VCC
V
VO
Output voltage
3-state
0
5.5
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
-12
mA
VCC = 3 V
-24
-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
12
mA
VCC = 3 V
24
24
t/
v
Input transition rise or fall rate
10
10
ns/V
TA
Operating free-air temperature
-55
125
-40
85
C
NOTE 5: All unused control 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.
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCES008N - JULY 1995 - 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
SN54LVCH245A
SN74LVCH245A
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
IOH = -100 A
1.65 V to 3.6 V
VCC-0.2
IOH = -100
A
2.7 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
2.2
V
IOH = -12 mA
3 V
2.4
2.4
IOH = -24 mA
3 V
2.2
2.2
IOL = 100 A
1.65 V to 3.6 V
0.2
IOL = 100
A
2.7 V to 3.6 V
0.2
VOL
IOL = 4 mA
1.65 V
0.45
V
VOL
IOL = 8 mA
2.3 V
0.7
V
IOL = 12 mA
2.7 V
0.4
0.4
IOL = 24 mA
3 V
0.55
0.55
II
Control inputs
VI = 0 to 5.5 V
3.6 V
5
5
A
Ioff
VI or VO = 5.5 V
0
10
A
VI = 0.58 V
1.65 V
25
VI = 1.07 V
1.65 V
-25
VI = 0.7 V
2.3 V
45
II(hold)
VI = 1.7 V
2.3 V
-45
A
II(hold)
VI = 0.8 V
3 V
75
75
A
VI = 2 V
3 V
-75
-75
VI = 0 to 3.6 V
3.6 V
500
500
IOZ
VO = 0 V or (VCC to 5.5 V)
2.3 V to 3.6 V
15
5
A
ICC
VI = VCC or GND
IO = 0
3.6 V
10
10
A
ICC
3.6 V
VI
5.5 V
IO = 0
3.6 V
10
10
A
ICC
One input at VCC - 0.6 V,
Other inputs at VCC or GND
2.7 V to 3.6 V
500
500
A
Ci
Control inputs
VI = VCC or GND
3.3 V
4
12
4
pF
Cio
A or B ports
VO = VCC or GND
3.3 V
5.5
12
5.5
pF
All typical values are at VCC = 3.3 V, TA = 25
C.
This is the bus-hold maximum dynamic current required to switch the input from one state to another.
For the total leakage current in an I/O port, please consult the II(hold) specification for the input voltage condition 0 V
<
VI
<
VCC, and the IOZ
specification for the input voltage conditions VI = 0 V or VI = VCC to 5.5 V. The bus-hold current, at input voltage greater than VCC, is negligible.
This applies in the disabled state only.
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