Texas Instruments SN74LVTH2245DBLE, SN74LVTH2245DBR, SN74LVTH2245DGVR, SN74LVTH2245DW, SN74LVTH2245DWR Datasheet
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SN54LVTH2245, SN74LVTH2245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS707C – SEPTEMBER 1997 – REVISED APRIL 1999
D
State-of-the-Art Advanced BiCMOS
Technology (ABT) Design for 3.3-V
Operation and Low Static-Power
Dissipation
D
B-Port Outputs Have Equivalent 22-Ω
Series Resistors, So No External Resistors
Are Required
D
I
and Power-Up 3-State Support Hot
off
Insertion
D
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
D
Support Mixed-Mode Signal Operation (5-V
Input and Output Voltages With 3.3-V V
D
Support Unregulated Battery Operation
Down to 2.7 V
D
Typical V
< 0.8 V at V
D
Latch-Up Performance Exceeds 500 mA Per
(Output Ground Bounce)
OLP
= 3.3 V, TA = 25°C
CC
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
CC
SN54LVTH2245...J OR W PACKAGE
SN74LVTH2245. . . DB, DW, OR PW PACKAGE
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
(TOP VIEW)
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
CC
)
SN54LVTH2245. . . FK PACKAGE
A3
A4
A5
A6
A7
(TOP VIEW)
A2A1DIR
3212019
4
5
6
7
8
10 11 12 13
9
A8
V
B8
GND
CC
B7
18
17
16
15
14
B6 OE
B1
B2
B3
B4
B5
description
These octal bus transceivers are designed specifically for low-voltage (3.3-V) VCC 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
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The B-port outputs, which are designed to source or sink up to 12 mA, include equivalent 22-Ω series resistors
to reduce overshoot and undershoot.
When V
is between 0 and 1.5 V , the devices are in the high-impedance state during power up or power down.
CC
However, to ensure the high-impedance state above 1.5 V, OE
the minimum value of the resistor is determined by the current-sinking capability of the driver.
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.
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.
) input can be used to disable the devices so the buses are effectively isolated.
should be tied to VCC through a pullup resistor;
Copyright 1999, Texas Instruments Incorporated
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN54LVTH2245, SN74LVTH2245
OPERATION
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS707C – SEPTEMBER 1997 – REVISED APRIL 1999
description (continued)
These devices are fully specified for hot-insertion applications using I
and power-up 3-state. The I
off
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 SN54L VTH2245 is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74LVTH2245 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
logic symbol
†
OE
DIR
A1
A2
A3
A4
A5
A6
A7
A8
19
1
2
3
4
5
6
7
8
9
G3
3EN1[BA]
3EN2[AB]
1
18
B1
2
17
16
15
14
13
12
11
B2
B3
B4
B5
B6
B7
B8
circuitry
off
†
logic diagram (positive logic)
2
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
1
DIR
2
A1
To Seven Other Channels
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
19
18
OE
B1
UNIT
IOHHigh-level output current
mA
IOLLow-level output current
mA
SN54LVTH2245, SN74LVTH2245
3.3-V ABT OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS707C – SEPTEMBER 1997 – REVISED APRIL 1999
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
Voltage range applied to any output in the high state, V
Current into any output in the low state, I
Current into any output in the high state, I
Input clamp current, I
Output clamp current, I
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 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.
–0.5 V to 4.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
: SN54LVTH2245 (A port) 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . .
O
(see Note 1) –0.5 V to V
O
SN74LVTH2245 (A port) 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . .
B port 30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): SN54LVTH2245 (A port) 48 mA. . . . . . . . . . . . . . .
O
SN74LVTH2245 (A port) 64 mA. . . . . . . . . . . . . . .
B port 30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(V
< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
I
(V
< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OK
O
(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
CC
+ 0.5 V. . . . . . . . . . . . .
†
recommended operating conditions (see Note 4)
SN54LVTH2245 SN74LVTH2245
MIN MAX MIN MAX
V
CC
V
IH
V
IL
V
I
∆t/∆v Input transition rise or fall rate Outputs enabled 10 10 ns/V
∆t/∆V
T
A
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,
Supply voltage 2.7 3.6 2.7 3.6 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
Input voltage 5.5 5.5 V
p
p
Power-up ramp rate 200 200 µs/V
CC
Operating free-air temperature –55 125 –40 85 °C
Implications of Slow or Floating CMOS Inputs
, literature number SCBA004.
A port –24 –32
B port –12 –12
A port 48 64
B port 12 12
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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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