SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102C − FEBRUARY 1992 − REVISED MARCH 2003
D Operating Voltage Range of 4.5 V to 5.5 V
D State-of-the-Art BiCMOS Design
DB, DW, N, OR NS PACKAGE
(TOP VIEW)
Significantly Reduces ICCZ
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
D B Port Has Equivalent 33-Ω Series
D
Resistors, So No External Resistors
Are Required
ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
− 1000-V Charged-Device Model (C101)
description/ordering information
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
The SN74BCT2245 octal transceiver and line/
MOS driver is designed for asynchronous
communication between data buses.
The device allows data transmission 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 disable the devices so that
both buses are effectively isolated.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The B-port outputs, which are designed to source or sink up to 12 mA, include 33-Ω series resistors to reduce
overshoot and undershoot.
ORDERING INFORMATION
PDIP − N
0°C to 70°C
†
ORDERABLE
PART NUMBER
PACKAGE†
TA
TOP-SIDE
MARKING
Tube
SN74BCT2245N
Tube
SN74BCT2245DW
Tape and reel
SN74BCT2245DWR
SOP − NS
Tape and reel
SN74BCT2245NSR
BCT2245
SSOP − DB
Tape and reel
SN74BCT2245DBR
BA245
SOIC − DW
SN74BCT2245N
BCT2245
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
OE
OPERATION
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
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.
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.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
1
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102C − FEBRUARY 1992 − REVISED MARCH 2003
logic diagram (positive logic)
DIR
1
19
A1
OE
2
18
B1
To Seven Other Channels
schematic of A-port outputs
schematic of B-port outputs
VCC
VCC
33 Ω
Output
Output
33 Ω
GND
GND
All resistor values shown are nominal.
2
•
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POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102C − FEBRUARY 1992 − REVISED MARCH 2003
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . . −0.5 V to 5.5 V
Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC
Input clamp current, IIK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 mA
Package thermal impedance, θJA (see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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 voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 3)
VCC
Supply voltage
VIH
High-level input voltage
VIL
Low-level input voltage
IIK
Input clamp current
IOH
High level output current
High-level
IOL
Low level output current
Low-level
TA
Operating free-air temperature
MIN
NOM
MAX
4.5
5
5.5
2
V
V
0.8
V
−18
mA
A port
−3
B port
−12
A port
24
B port
12
0
UNIT
70
mA
mA
°C
NOTE 3: 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.
•
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•
3
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102C − FEBRUARY 1992 − REVISED MARCH 2003
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
TEST CONDITIONS
VCC = 4.5 V,
A port
VOH
VOL
5V
VCC = 4
4.5
A port
VCC = 4.5 V,
B port
II
IIH‡
IOH = −1 mA
2.5
3.4
IOH = −3 mA
2.4
3.3
IOH = −1 mA
2.4
3.3
IOH = −12 mA
2
IOL = 24 mA
Control input
B to A
B to A
Ci
Cio
B to A
Control input
A to B
B to A
0.5
0.8
VCC = 5.5 V,
VI = 5.5 V
0.1
5V
VCC = 5
5.5
V,
7V
VI = 2
2.7
VCC = 5.5 V,
VI = 0.5 V
VCC = 5
5.5
5V
V,
VO = 0
5V
VCC = 5
5.5
V,
Outputs open
VCC = 5
5.5
5V
V,
Outputs open
VCC = 5
5.5
5V
V,
Outputs open
VCC = 5 V,
VI = 2.5 V or 0.5 V
70
20
−0.65
−60
−150
−100
−225
A to B
ICCZ
V
IOL = 12 mA
A to B
ICCH
V
0.5
VCC = 4
4.5
5V
A to B
ICCL
UNIT
−1.2
IOL = 1 mA
A port
B port
MAX
3.2
0.35
A or B port
IIL‡
IOS§
TYP†
II = −18 mA
VCC = 4
4.5
5V
B port
MIN
VCC = 5 V
V,
63
100
40
64
37
59
29
46
9
15
8
14
7
mA
A
μA
mA
mA
mA
mA
mA
pF
9
VO = 2
2.5
5 V or 0.5
05V
V
pF
12
†
All typical values are at VCC = 5 V, TA = 25°C.
For I/O ports, the parameters IIH and IIL include the off-state output current.
§ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
‡
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER
tPLH
tPHL
4
FROM
(INPUT)
TO
(OUTPUT)
A
B
VCC = 5 V,
TA = 25°C
MIN
MAX
4.9
1
5.8
6.1
1.7
7
5.1
6.9
2.5
7.8
4.7
7.1
2.2
7.7
3.2
6.2
8.6
3.2
9.9
A
3.8
7.2
9.5
3.8
11.1
B
5.6
8.3
10.9
5.6
12.2
A
4.2
7.6
10.1
4.2
11.4
B
2.6
5.2
7.1
2.6
8.2
A
3.1
5.7
8
3.1
9.4
B
3.5
6
7.9
3.5
9.2
A
2.3
4.7
6.5
2.3
7.6
MIN
TYP
MAX
B
1
3.3
A
1.7
4.2
A
B
2.5
B
A
2.2
B
tPZH
OE
tPZL
OE
tPHZ
OE
tPLZ
OE
•
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POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
UNIT
ns
ns
ns
ns
ns
ns
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102C − FEBRUARY 1992 − REVISED MARCH 2003
PARAMETER MEASUREMENT INFORMATION
7 V (tPZL, tPLZ, O.C.)
S1
Open
(all others)
From Output
Under Test
Test
Point
CL
(see Note A)
R1
From Output
Under Test
R1
Test
Point
CL
(see Note A)
R2
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
RL = R1 = R2
LOAD CIRCUIT FOR
3-STATE AND OPEN-COLLECTOR OUTPUTS
High-Level
Pulse
(see Note B)
3V
Timing Input
(see Note B)
3V
1.5 V
1.5 V
0V
1.5 V
tw
0V
Data Input
(see Note B)
3V
th
tsu
Low-Level
Pulse
3V
1.5 V
1.5 V
0V
1.5 V
1.5 V
VOLTAGE WAVEFORMS
PULSE DURATION
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
3V
Output
Control
(low-level enable)
3V
Input
(see Note B)
1.5 V
1.5 V
0V
In-Phase
Output
(see Note D)
VOH
1.5 V
VOL
0V
1.5 V
3.5 V
VOL
tPHZ
VOH
1.5 V
tPLZ
1.5 V
Waveform 1
(see Notes C and D)
tPLH
tPHL
Out-of-Phase
Output
(see Note D)
1.5 V
1.5 V
tPZL
tPHL
tPLH
1.5 V
0.3 V
tPZH
Waveform 2
(see Notes C and D)
VOL
VOH
1.5 V
0.3 V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES (see Note D)
NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, tr = tf ≤ 2.5 ns, duty cycle = 50%.
C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
D. The outputs are measured one at a time with one transition per measurement.
E. When measuring propagation delay times of 3-state outputs, switch S1 is open.
F. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
•
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•
5
PACKAGE OPTION ADDENDUM
www.ti.com
6-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN74BCT2245DW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
BCT2245
SN74BCT2245NSR
ACTIVE
SO
NS
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
BCT2245
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of