Texas Instruments SN74BCT245DW, SN74BCT245DWR, SN74BCT245N, SN74BCT245DBLE, SN74BCT245DBR Datasheet
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SN54BCT245, SN74BCT245
OPERATION
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
• 3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
• Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(J, N)
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
used to disable the device so the buses are
effectively isolated.
The SN74BCT245 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 SN54BCT245 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT245 is characterized for
operation from 0°C to 70°C.
) input can be
SN54BCT245 ...J OR W PACKAGE
SN74BCT245 . . . DB, DW, OR N P ACKAGE
SN54BCT245 . . . FK PACKAGE
A3
A4
A5
A6
A7
(TOP VIEW)
DIR
1
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
9
A8
GND
10
(TOP VIEW)
A2A1DIR
3212019
4
5
6
7
8
910111213
A8
B8
20
19
18
17
16
15
14
13
12
11
V
B7
CC
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
18
17
16
15
14
B6 OE
CC
B1
B2
B3
B4
B5
GND
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.
FUNCTION TABLE
INPUTS
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1994, Texas Instruments Incorporated
2–1
SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994
19
1
2
3
4
5
6
7
8
9
†
G3
3EN1[BA]
3EN2[AB]
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
1
2
logic diagram (positive logic)
1
DIR
2
A1
To Seven Other Channels
19
18
OE
B1
logic symbol
OE
DIR
A1
A2
A3
A4
A5
A6
A7
A8
†
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
Input voltage range: 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
Voltage range applied to any output in the high state, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
O
Current into any output in the low state: SN54BCT245 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT245 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power dissipation (DB package only) (see Note 2) 650 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54BCT245 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT245 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 voltage ratings may be exceeded if the input and output current ratings are observed.
2. Power dissipation is application dependent and is a function of supply voltage, operating temperature, the number of outputs
switching simultaneously , and output duty cycle. Because the thermal resistance of the DB package is higher than that of the DW
or N packages, the DB package may not be suitable for some applications.
– 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
– 0.5 V to 7 V. . . . . . . . . . . . . . . . .
– 0.5 V to V
‡
CC
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT245, SN74BCT245
UNIT
IOHHigh-level output current
mA
IOLLow-level output current
mA
PARAMETER
TEST CONDITIONS
UNIT
A port
V
V
A port
V
4.5 V
V
V
B port
V
V
I
V
V
V
mA
I
‡
V
5.5 V
V
2.7 V
A
I
‡
V
V
V
mA
I
§
V
V
0
mA
C
V
V
V
pF
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994
recommended operating conditions
SN54BCT245 SN74BCT245
MIN NOM MAX MIN NOM MAX
V
CC
V
IH
V
IL
I
IK
T
A
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
V
IK
V
OH
OL
I
IH
IL
OS
I
CCL
I
CCH
I
CCZ
C
i
io
†
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.
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
Input clamp current –18 –18 mA
p
p
Operating free-air temperature –55 125 0 70 °C
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
p
B port VCC = 4.5 V
p
p
A or B port
Control input
A or B port
Control input
A or B port
Control input
A port
B port
A to B VCC = 5.5 V 57 90 57 90 mA
A to B VCC = 5.5 V 36 57 36 57 mA
Control input VCC = 5 V, VI = 2.5 V or 0.5 V 7 7 pF
A to B
B to A
= 4.5
CC
=
CC
= 4.5
CC
= 5.5 V,
CC
,
=
CC
= 5.5 V,
CC
= 5.5 V,
CC
VCC = 5.5 V 10 15 10 15 mA
= 5 V,
CC
IOH = –1 mA 2.5 3.4 2.5 3.4
IOH = –3 mA 2.4 3.3 2.4 3.3
IOH = –3 mA 2.4 3.3 2.4 3.3
IOH = –12 mA 2 3.2
IOH = –15 mA 2 3.1
IOL = 20 mA 0.3 0.5
IOL = 24 mA 0.35 0.5
IOL = 48 mA 0.38 0.55
IOL = 64 mA 0.42 0.55
I
I
I
O
O
A port –3 –3
B port –12 –15
A port 20 24
B port 48 64
SN54BCT245 SN74BCT245
MIN TYP†MAX MIN TYP†MAX
= 5.5
=
= 0.5
=
= 2.5 V or 0.5
–60 –150 –60 –150
–100 –225 –100 –225
12 12
1 1
0.1 0.1
70 70
20 20
–0.65 –0.65
–1.2 –1.2
9 9
V
µ
p
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–3
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