TI SN74BCT2245DW

SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
•
•
•
•
DB, DW, OR N PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
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)
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
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
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
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
Copyright  1994, 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
2–1
SN74BCT2245
OCTAL TRANSCEIVER AND LINE/MOS DRIVER
WITH 3-STATE OUTPUTS
SCBS102B – FEBRUARY 1992 – REVISED APRIL 1994
logic symbol†
OE
DIR
A1
19
1
2
logic diagram (positive logic)
G3
DIR
1
3EN1[BA]
3EN2[AB]
19
18
1
B1
A1
OE
2
2
A2
A3
A4
A5
A6
A7
A8
3
17
4
16
5
15
6
14
7
13
8
12
9
11
B2
18
B3
B4
B5
B6
B7
To Seven Other Channels
B8
† 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
VCC
VCC
33 Ω
Output
Output
33 Ω
GND
GND
All resistor values shown are nominal.
2–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
B1
SN74BCT2245
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 VCC
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA
Current into any output in the low state, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 mA
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
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
V
Input clamp current
–18
mA
IOH
High level output current
High-level
IOL
Low level output current
Low-level
High-level input voltage
2
POST OFFICE BOX 655303
V
A port
–3
B port
–12
A port
24
B port
12
TA
Operating free-air temperature
NOTE 2: Unused or floating pins (input or I/O) must be held high or low.
• DALLAS, TEXAS 75265
0
V
70
mA
mA
°C
2–3
SN74BCT2245
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
VIK
TEST CONDITIONS
VCC = 4.5 V,
A port
VCC = 4
4.5
5V
VOH
VOL
B port
5V
VCC = 4
4.5
A port
VCC = 4.5 V,
B port
II
IIH‡
A or B port
Control input
IIL‡
IOS§
ICCL
ICCH
ICCZ
Ci
Cio
i
A port
B port
A to B
B to A
A to B
B to A
A to B
B to A
Control input
A to B
B to A
II = –18 mA
IOH = –1 mA
IOH = – 3 mA
IOH = –1 mA
IOH = –12 mA
IOL = 24 mA
MIN
2.5
3.4
2.4
3.3
2.4
3.3
2
MAX
UNIT
–1.2
V
V
3.2
0.35
0.5
VCC = 4
4.5
5V
IOL = 1 mA
IOL = 12 mA
0.5
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
VCC = 5 V
V,
70
20
– 0.65
– 60
–150
–100
– 225
VO = 2.5
2 5 V or 0.5
05V
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
V
0.8
† 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.
2–4
TYP†
63
100
40
64
37
59
29
46
9
15
8
14
7
9
12
mA
µA
mA
mA
mA
mA
mA
pF
pF
SN74BCT2245
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, CL = 50 pF (unless otherwise noted) (see Note 3)
PARAMETER
tPLH
tPHL
FROM
(INPUT)
TO
(OUTPUT)
A
VCC = 5 V,
TA = 25°C
MIN
MAX
4.9
1
5.8
4.2
6.1
1.7
7
2.5
5.1
6.9
2.5
7.8
2.2
4.7
7.1
2.2
7.7
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
MIN
TYP
MAX
B
1
3.3
B
A
1.7
A
B
B
A
tPZH
OE
tPZL
OE
tPHZ
OE
tPLZ
OE
UNIT
ns
ns
ns
ns
ns
ns
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
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