SN54LVTR245, SN74LVTR245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS428 OCTOBER 1993
Copyright
1993, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
State-of-the-Art Advanced BiCMOS
Technology (ABT) Design for 3.3-V
Operation and Low-Static Power
Dissipation
Supports Mixed-Mode Signal Operation
(5-V Input and Output Voltages With
3.3-V V
CC
)
Supports Unregulated Battery Operation
Down to 2.7 V
Typical V
OLP
(Output Ground Bounce)
< 0.8 V at V
CC
= 3.3 V, T
A
= 25
C
Latch-Up Performance Exceeds 500 mA
Per JEDEC Standard JESD-17
Bus-Hold Data Inputs Eliminate the Need
for External Pullup Resistors
Reduced Output Structure on A Port
Minimizes V
OHV
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK), and
Ceramic DIPs (J)
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.
The
LVTR245 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 upon 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.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The A port is designed to minimize the undershoot exhibited on high to low transition during simultaneous
switching conditions.
The SN74LVTR245 is available in TI's shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.
The SN54LVTR245 is characterized for operation over the full military temperature range of 55
C to 125
C.
The SN74LVTR245 is characterized for operation from 40
C to 85
C.
FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
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
SN54LVTR245 . . . J PACKAGE
SN74LVTR245 . . . 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
SN54LVTR245 . . . FK PACKAGE
(TOP VIEW)
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
SN54LVTR245, SN74LVTR245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS428 OCTOBER 1993
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
logic diagram (positive logic)
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
DIR
OE
A1
B1
1
2
18
19
To Seven Other Channels
1
2
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
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 state or power-off state, V
O
(see Note 1)
0.5 V to 7 V
. . . .
Current into any output in the low state, I
O
: SN54LVTR245
96 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74LVTR245
128 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the high state, I
O
(see Note 2): SN54LVTR245
48 mA
. . . . . . . . . . . . . . . . . . . . . . . .
SN74LVTR245
64 mA
. . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at T
A
= 55
C (in still air): DB package
0.65 W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
0.85 W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
0.6 W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
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 will only flow when the output is in the high state and VO > VCC.
SN54LVTR245, SN74LVTR245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS428 OCTOBER 1993
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
SN54LVTR245
SN74LVTR245
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
B port
24
32
mA
IOH
High-level output current
A port
8
12
mA
IOL
Low-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
TA
Operating free-air temperature
55
125
40
85
C
Current duty cycle
50%, f
1 kHz
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
SN54LVTR245, SN74LVTR245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS428 OCTOBER 1993
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54LVTR245
SN74LVTR245
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 = MIN to MAX, IOH = 100
A
VCC 0.2
VCC 0.2
VCC = 2.7 V,
IOH = 8 mA
B port
2.4
2.4
VCC = 3 V
IOH = 24 mA
B port
2
VCC = 3 V
IOH = 32 mA
2
VOH
VCC = MIN to MAX, IOH = 100
A
VCC 0.2
VCC 0.2
V
VCC = 2.7 V,
IOH = 1 mA
2.4
2.4
IOH = 3 mA
A port
2.4
2.4
VCC = 3 V
IOH = 8 mA
2
IOH = 12 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
VCC = 3.6 V,
VI = VCC or GND
Control pins
1
1
VCC = 0 or MAX,
VI = 5.5 V
Control pins
10
10
II
VI = 5.5 V
100
20
A
VCC = 3.6 V
VI = VCC
A or B ports
5
5
VI = 0
5
5
II(h ld)
VCC = 3 V
VI = 0.8 V
A or B ports
75
75
A
II(hold)
VCC = 3 V
VI = 2 V
A or B ports
75
75
A
IOZH
VCC = 3.6 V,
VO = 3 V
1
1
A
IOZL
VCC = 3.6 V,
VO = 0.5 V
1
1
A
Outputs high
0.13
0.5
0.13
0.19
ICC
VCC = 3.6 V,
IO = 0,
Outputs low
8.8
14
8.8
12
mA
ICC
VI = VCC or GND
Outputs
disabled
0.13
0.5
0.13
0.19
mA
ICC
VCC = 3 V to 3.6 V,
One input at VCC 0.6 V,
Other inputs at VCC or GND
0.3
0.2
mA
Ci
VI = 3 V or 0
4
4
pF
Cio
VO = 3 V or 0
10
10
pF
All typical values are at VCC = 3.3 V, TA = 25
C.
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
Unused pins at VCC or GND
This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
SN54LVTR245, SN74LVTR245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS428 OCTOBER 1993
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
FROM
TO
SN54LVTR245
TA = 55
C to 125
C
SN74LVTR245
TA = 40
C to 85
C
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
B
1.1
4.3
4.8
1.1
2.5
4.2
4.7
ns
tPLH
B
A
1.4
4.5
5.4
1.4
2.7
4.4
5.3
ns
tPHL
A
B
1.1
4.7
5.9
1.1
2.6
4.6
5.8
ns
tPHL
B
A
1
4.2
5.3
1
2.3
4.1
5.1
ns
tPZH
OE
B
1.3
5.9
7
1.3
3.1
5.5
6.7
ns
tPZH
OE
A
1.6
6.1
8.4
1.6
3.6
6
8.3
ns
tPZL
OE
B
2
6.7
8.1
2
3.9
6.6
8
ns
tPZL
OE
A
1.8
6.5
7.7
1.8
3.8
6.4
7.6
ns
tPHZ
OE
B
2.7
6.5
7
2.7
4.2
6.1
6.7
ns
tPHZ
OE
A
2.5
6.2
6.8
2.5
4
5.8
6.4
ns
tPLZ
OE
B
2.4
5.6
5.6
2.4
3.7
5.2
5.4
ns
tPLZ
OE
A
2.4
5.5
5.6
2.4
3.7
5.2
5.3
ns
All typical values are at VCC = 3.3 V, TA = 25
C.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
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