SN74BCT2245
OPERATION
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
• B Port Has Equivalent 33-Ω Series
Resistors, So No External Resistors
Are Required
• Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages and Standard
Plastic 300-mil DIPs (N)
DB, DW, OR N PACKAGE
(TOP VIEW)
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
CC
description
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 upon
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.
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.
The SN74BCT2245 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
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
Copyright 1994, Texas Instruments Incorporated
2–1
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
19
1
2
3
4
5
6
7
8
9
†
G3
3EN1[BA]
3EN2[AB]
1
logic diagram (positive logic)
1
DIR
18
B1
2
17
16
15
14
13
12
11
B2
B3
B4
B5
B6
B7
B8
A1
2
To Seven Other Channels
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.
schematic of A-port outputs schematic of B-port outputs
V
CC
V
CC
19
18
OE
B1
GND
All resistor values shown are nominal.
Output
33 Ω
Output
33 Ω
GND
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74BCT2245
IOHHigh-level output current
mA
IOLLow-level output current
mA
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
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 (except I/O ports) (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 V
Input clamp current, I
Current into any output in the low state, I
(V
< 0) –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
I
60 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range 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.
NOTE 1: The input negative-voltage rating may be exceeded if the input clamp-current rating is observed.
recommended operating conditions (see Note 2)
MIN NOM MAX UNIT
V
CC
V
IH
V
IL
I
IK
T
A
NOTE 2: Unused or floating pins (input or I/O) must be held high or low.
Supply voltage 4.5 5 5.5 V
High-level input voltage 2 V
Low-level input voltage 0.8 V
Input clamp current –18 mA
p
p
Operating free-air temperature 0 70 °C
A port –3
B port –12
A port 24
B port 12
†
CC
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–3
SN74BCT2245
A port
V
4.5 V
V
V
B port
V
4.5 V
B port
V
V
I
‡
V
V
V
A
I
§
V
V
0
mA
I
V
Outputs open
mA
I
V
5.5 V
Outputs open
mA
I
V
Outputs open
mA
C
V
V
V
pF
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
p
OH
p
A port VCC = 4.5 V, IOL = 24 mA 0.35 0.5
V
OL
I
I
IH
‡
I
IL
OS
CCL
CCH
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.
p
A or B port
Control input
A port
B port
A to B
B to A
A to B
B to A
A to B
B to A
Control input VCC = 5 V, VI = 2.5 V or 0.5 V 7 pF
A to B
B to A
VCC = 4.5 V, II = –18 mA –1.2 V
=
CC
=
CC
= 4.5
CC
VCC = 5.5 V, VI = 5.5 V 0.1 mA
= 5.5 V,
CC
VCC = 5.5 V, VI = 0.5 V –0.65 mA
= 5.5 V,
CC
= 5.5 V,
CC
,
=
CC
= 5.5 V,
CC
= 5 V,
CC
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 3.2
IOL = 1 mA 0.5
IOL = 12 mA 0.8
= 2.7
I
=
O
p
p
p
p
p
p
= 2.5 V or 0.5
O
–60 –150
–100 –225
70
20
63 100
40 64
37 59
29 46
9 15
8 14
9
12
V
µ
p
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74BCT2245
(INPUT)
(OUTPUT)
t
ns
t
ns
t
OE
ns
t
OE
ns
t
OE
ns
t
OE
ns
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
PARAMETER
PLH
PHL
PZH
PZL
PHZ
PLZ
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
= 50 pF (unless otherwise noted) (see Note 3)
L
FROM
A B 1 3.3 4.9 1 5.8
B A 1.7 4.2 6.1 1.7 7
A B 2.5 5.1 6.9 2.5 7.8
B A 2.2 4.7 7.1 2.2 7.7
TO
B 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
VCC = 5 V,
TA = 25°C
MIN TYP MAX
MIN MAX UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–5
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
2–6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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Copyright 1998, Texas Instruments Incorporated
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