SN54LVTH245A, SN74LVTH245A
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS130P MAY 1992 REVISED APRIL 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
State-of-the-Art Advanced BiCMOS
Technology (ABT) Design for 3.3-V
Operation and Low Static-Power
Dissipation
D
Support Mixed-Mode Signal Operation (5-V
Input and Output Voltages With 3.3-V V
CC
)
D
Support Unregulated Battery Operation
Down to 2.7 V
D
Typical V
OLP
(Output Ground Bounce)
< 0.8 V at V
CC
= 3.3 V, T
A
= 25
C
D
I
off
and Power-Up 3-State Support Hot
Insertion
D
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
D
Latch-Up Performance Exceeds 500 mA Per
JESD 17
D
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK),
Ceramic Flat (W) Packages, and Ceramic
(J) DIPs
description
These octal bus transceivers are designed specifically for low-voltage (3.3-V) V
CC
operation, but with the
capability to provide a TTL interface to a 5-V system environment.
These devices are designed for asynchronous communication between data buses. They 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 devices so the buses are effectively isolated.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
When V
CC
is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, 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.
These devices are fully specified for hot-insertion applications using I
off
and power-up 3-state. The I
off
circuitry
disables the outputs, preventing damaging current backflow through the devices when they are powered down.
The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.
The SN54LVTH245A is characterized for operation over the full military temperature range of 55
C to 125
C.
The SN74LVTH245A is characterized for operation from 40
C to 85
C.
Copyright
1999, 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.
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.
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.
SN54LVTH245A . . . J OR W PACKAGE
SN74LVTH245A . . . DB, DW, OR PW 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
SN54LVTH245A . . . FK 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
SN54LVTH245A, SN74LVTH245A
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS130P MAY 1992 REVISED APRIL 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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 symbol
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
B2
17
B3
16
B4
15
A5
6
A6
7
A7
8
A8
9
A2
3
A3
4
A4
5
OE
A1
2
G3
19
3EN2[AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3EN1[BA]
1
DIR
1
2
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
SN54LVTH245A, SN74LVTH245A
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS130P MAY 1992 REVISED APRIL 1999
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 4.6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1)
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high-impedance
or power-off state, V
O
(see Note 1)
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state, V
O
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . .
Current into any output in the low state, I
O
: SN54LVTH245A 96
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74LVTH245A 128
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the high state, I
O
(see Note 2): SN54LVTH245A
48 mA
. . . . . . . . . . . . . . . . . . . . . .
SN74LVTH245A 64
mA
. . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 3): DB package
115
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
97
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
128
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 and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. This current flows only when the output is in the high state and VO > VCC.
3. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions (see Note 4)
SN54LVTH245A
SN74LVTH245A
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
2.7
3.6
2.7
3.6
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
VI
Input voltage
5.5
5.5
V
IOH
High-level output current
24
32
mA
IOL
Low-level output current
48
64
mA
t/
v
Input transition rise or fall rate
Outputs enabled
10
10
ns/V
t/
VCC
Power-up ramp rate
200
200
s/V
TA
Operating free-air temperature
55
125
40
85
C
NOTE 4: 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.
SN54LVTH245A, SN74LVTH245A
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS130P MAY 1992 REVISED APRIL 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54LVTH245A
SN74LVTH245A
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 2.7 V,
II = 18 mA
1.2
1.2
V
VCC = 2.7 V to 3.6 V,
IOH = 100
A
VCC0.2
VCC0.2
VOH
VCC = 2.7 V,
IOH = 8 mA
2.4
2.4
V
VOH
VCC = 3 V
IOH = 24 mA
2
V
VCC = 3 V
IOH = 32 mA
2
VCC = 2 7 V
IOL = 100
A
0.2
0.2
VCC = 2.7 V
IOL = 24 mA
0.5
0.5
VOL
IOL = 16 mA
0.4
0.4
V
VOL
VCC = 3 V
IOL = 32 mA
0.5
0.5
V
VCC = 3 V
IOL = 48 mA
0.55
IOL = 64 mA
0.55
Control inputs
VCC = 3.6 V,
VI = VCC or GND
1
1
Control inputs
VCC = 0 or 3.6 V,
VI = 5.5 V
10
10
II
VI = 5.5 V
20
20
A
A or B ports
VCC = 3.6 V
VI = VCC
1
1
VI = 0
5
5
Ioff
VCC = 0,
VI or VO = 0 to 4.5 V
100
A
VCC = 3 V
VI = 0.8 V
75
75
II(hold)
A or B ports
VCC = 3 V
VI = 2 V
75
75
A
II(hold)
A or B orts
VCC = 3.6 V,
VI = 0 to 3.6 V
500
750
A
IOZPU
VCC = 0 to 1.5 V, VO = 0.5 V to 3 V,
OE = don't care
100
100
A
IOZPD
VCC = 1.5 V to 0, VO = 0.5 V to 3 V,
OE = don't care
100
100
A
VCC = 3.6 V,
Outputs high
0.19
0.19
ICC
VCC = 3.6 V,
IO = 0,
Outputs low
5
5
mA
VI = VCC or GND
Outputs disabled
0.19
0.19
ICC
VCC = 3 V to 3.6 V, One input at VCC 0.6 V,
Other inputs at VCC or GND
0.2
0.2
mA
Ci
VI = 3 V or 0
4
4
pF
Cio
VO = 3 V or 0
9
9
pF
On products compliant to MIL-PRF-38535, this parameter is not production tested.
All typical values are at VCC = 3.3 V, TA = 25
C.
Unused terminals are at VCC or GND.
This is the bus-hold maximum dynamic current. It is the minimum overdrive current required to switch the input from one state to another.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
SN54LVTH245A, SN74LVTH245A
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS130P MAY 1992 REVISED APRIL 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
SN54LVTH245A
SN74LVTH245A
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 3.3 V
0.3 V
VCC = 2.7 V
VCC = 3.3 V
0.3 V
VCC = 2.7 V
UNIT
MIN
MAX
MIN
MAX
MIN
TYP
MAX
MIN
MAX
tPLH
A or B
B or A
0.7
3.7
4.2
1.2
2.3
3.5
4
ns
tPHL
A or B
B or A
0.7
3.7
4.2
1.2
2.1
3.5
4
ns
tPZH
OE
A or B
1.2
5.7
7.4
1.3
3.2
5.5
7.1
ns
tPZL
OE
A or B
1.6
5.7
6.8
1.7
3.4
5.5
6.5
ns
tPHZ
OE
A or B
1.8
6.2
6.8
2.2
3.5
5.9
6.5
ns
tPLZ
OE
A or B
1.8
5.3
5.5
2.2
3.4
5
5.1
ns
All typical values are at VCC = 3.3 V, TA = 25
C.
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