SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013H SEPTEMBER 1998 REVISED MAY 2002
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
D
ESD Protection Exceeds JESD 22
2000-V Human-Body Model (A114-A)
description
These octal bus transceivers are designed for
asynchronous communication between data
buses. The devices transmit data from the A bus
to the B bus or from the B bus to the A bus,
depending upon the 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.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP N
Tube
SN74BCT245N
SN74BCT245N
SOIC
DW
Tube
SN74BCT245DW
BCT245
0
C to 70
C
SOIC DW
Tape and reel
SN74BVT245DWR
BCT245
0
C to 70
C
SOP NS
Tape and reel
SN74BCT245NSR
BCT245
SSOP DB
Tape and reel
SN74BCT245DBR
BT245
TSSOP PW
Tape and reel
SN74BCT245PWR
BT245
CDIP J
Tube
SNJ54BCT245J
SNJ54BCT245J
55
C to 125
C
CFP W
Tube
SNJ54BCT245W
SNJ54BCT245W
LCCC FK
Tube
SNJ54BCT245FK
SNJ54BCT245FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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
SN54BCT245 . . . J OR W PACKAGE
SN74BCT245 . . . DB, DW, N, NS, 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
SN54BCT245 . . . FK PACKAGE
(TOP VIEW)
A2
A1
DIR
B7
B6
OE
A8
GND
B8
V
CC
Copyright
2002, Texas Instruments Incorporated
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.
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.
SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013H SEPTEMBER 1998 REVISED MAY 2002
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 diagram (positive logic)
DIR
OE
A1
B1
1
2
18
19
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
: Control inputs (see Note 1)
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O ports (see Note 1)
0.5 V to 5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state, V
O
0.5 V to 7 V
. . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state, V
O
0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state, I
O
: SN54BCT245 96
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT245 128
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DB package
70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package
60
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
83
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 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.
SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013H SEPTEMBER 1998 REVISED MAY 2002
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54BCT245
SN74BCT245
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
IIK
Input clamp current
18
18
mA
IOH
High level output current
A port
3
3
mA
IOH
High-level output current
B port
12
15
mA
IOL
Low level output current
A port
20
24
mA
IOL
Low-level output current
B port
48
64
mA
TA
Operating free-air temperature
55
125
0
70
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.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54BCT245
SN74BCT245
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
V
A port
VCC = 4 5 V
IOH = 1 mA
2.5
3.4
2.5
3.4
A port
VCC = 4.5 V
IOH = 3 mA
2.4
3.3
2.4
3.3
VOH
IOH = 3 mA
2.4
3.3
2.4
3.3
V
B port
VCC = 4.5 V
IOH = 12 mA
2
3.2
IOH = 15 mA
2
3.1
A port
VCC = 4 5 V
IOL = 20 mA
0.3
0.5
VOL
A port
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
VOL
B port
VCC = 4 5 V
IOL = 48 mA
0.38
0.55
V
B port
VCC = 4.5 V
IOL = 64 mA
0.42
0.55
I
A or B port
VCC = 5 5 V
VI = 5 5 V
1
1
mA
II
Control input
VCC = 5.5 V,
VI = 5.5 V
0.1
0.1
mA
I
A or B port
VCC = 5 5 V
VI = 2 7 V
70
70
A
IIH
Control input
VCC = 5.5 V,
VI = 2.7 V
20
20
A
I
A or B port
VCC = 5 5 V
VI = 0 5 V
0.65
0.65
mA
IIL
Control input
VCC = 5.5 V,
VI = 0.5 V
1.2
1.2
mA
I
A port
VCC = 5 5 V
VO = 0
60
150
60
150
mA
IOS
B port
VCC = 5.5 V,
VO = 0
100
225
100
225
mA
ICCL
A to B
VCC = 5.5 V
57
90
57
90
mA
ICCH
A to B
VCC = 5.5 V
36
57
36
57
mA
ICCZ
VCC = 5.5 V
10
15
10
15
mA
Ci
Control input
VCC = 5 V,
VI = 2.5 V or 0.5 V
7
7
pF
Ci
A to B
VCC = 5 V
VO = 2 5 V or 0 5 V
9
9
pF
Cio
B to A
VCC = 5 V,
VO = 2.5 V or 0.5 V
12
12
pF
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.
SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013H SEPTEMBER 1998 REVISED MAY 2002
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
R1 = 500
,
R2 = 500
,
TA = 25
C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
,
R2 = 500
,
TA = MIN to MAX
UNIT
BCT245
SN54BCT245
SN74BCT245
MIN
TYP
MAX
MIN
MAX
MIN
MAX
tPLH
A or B
B or A
1
4.4
6
1
7.2
1
7
ns
tPHL
A or B
B or A
1.5
4.8
6.6
1.5
7.6
1.5
7
ns
tPZH
OE
A or B
1.5
8
9.4
1.5
11.2
1.5
10.9
ns
tPZL
OE
A or B
1.5
8
10.2
1.5
11.8
1.5
11.6
ns
tPHZ
OE
A or B
1.5
5.8
8.3
1.5
9.7
1.5
9.3
ns
tPLZ
OE
A or B
1.5
5.1
7.8
1.5
9.6
1.5
9.1
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013H SEPTEMBER 1998 REVISED MAY 2002
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
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.
From Output
Under Test
Test
Point
R1
CL
(see Note A)
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE AND OPEN-COLLECTOR OUTPUTS
R1
S1
7 V (tPZL, tPLZ, O.C.)
Open
(all others)
From Output
Under Test
Test
Point
R2
CL
(see Note A)
RL = R1 = R2
1.5 V
1.5 V
1.5 V
3 V
3 V
0 V
0 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing Input
(see Note B)
Data Input
(see Note B)
1.5 V
1.5 V
3 V
3 V
0 V
0 V
High-Level
Pulse
(see Note B)
Low-Level
Pulse
tw
VOLTAGE WAVEFORMS
PULSE DURATION
1.5 V
1.5 V
tPHL
tPLH
tPLH
tPHL
Input
(see Note B)
Out-of-Phase
Output
(see Note D)
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
3 V
0 V
VOL
VOH
VOH
VOL
In-Phase
Output
(see Note D)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES (see Note D)
tPHZ
tPLZ
0.3 V
tPZL
tPZH
1.5 V
1.5 V
1.5 V
1.5 V
3 V
0 V
Output
Control
(low-level enable)
Waveform 1
(see Notes C and D)
Waveform 2
(see Notes C and D)
0 V
VOH
VOL
3.5 V
0.3 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
Figure 1. Load Circuit and Voltage Waveforms
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