SN54BCT623, SN74BCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS020A SEPTEMBER 1988 REVISED NOVEMBER 1993
Copyright
1993, Texas Instruments Incorporated
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Plastic and Ceramic 300-mil DIPs (J, N)
description
The
BCT623 bus transceiver is designed for
asynchronous communication between data
buses. The control function implementation allows
for maximum flexibility in timing. The
BCT623
provides true data at its outputs.
This 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 levels at the
output-enable (OEAB and OEBA) inputs.
The output-enable inputs can be used to disable
the device so that the buses are effectively
isolated. The dual-enable configuration gives the
transceivers the capability of storing data by
simultaneously enabling OEAB and OEBA. Each
output reinforces its input in this configuration.
When both OEAB and OEBA are enabled and all
other data sources to the two sets of bus lines are
at high impedance, both sets of bus lines (16 in all)
will remain at their last states.
The SN54BCT623 is characterized for operation
over the full military temperature range of 55
C
to 125
C. The SN74BCT623 is characterized for
operation from 0
C to 70
C.
FUNCTION TABLE
INPUTS
OPERATION
OEBA
OEAB
OPERATION
L
L
B data to A bus
L
H
B data to A bus,
A data to B bus
H
L
Isolation
H
H
A data to B bus
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OEAB
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OEBA
B1
B2
B3
B4
B5
B6
B7
B8
SN54BCT623 . . . J OR W PACKAGE
SN74BCT623 . . . DW OR N 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
SN54BCT623 . . . FK PACKAGE
(TOP VIEW)
A2
A1
OEAB
B7
B6
OEBA
A8
GND
B8
V
CC
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.
SN54BCT623, SN74BCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS020A SEPTEMBER 1988 REVISED NOVEMBER 1993
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
logic diagram (positive logic)
2
A1
B1
EN1
19
EN2
1
OEAB
2
A1
3
A2
B1
18
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
B2
17
B3
16
B5
14
B4
15
B6
13
B8
11
B7
12
OEBA
1
OEBA
OEAB
19
1
18
2
1
1
To Seven Other Channels
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
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
O
0.5 V to 5.5 V
. . . . . . . . . . . . . . .
Voltage range applied to any output in the high state, V
O
0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
30 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54BCT623
96 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT623
128 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range:
SN54BCT623
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT623 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 and output voltage ratings may be exceeded if the input and output current ratings are observed.
recommended operating conditions
SN54BCT623
SN74BCT623
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
SN54BCT623, SN74BCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS020A SEPTEMBER 1988 REVISED NOVEMBER 1993
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54BCT623
SN74BCT623
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
OEAB or OEBA
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
OEAB or OEBA
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
OEAB or OEBA
VCC = 5.5 V,
VI = 0.5 V
0.6
0.6
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
58
92
58
92
mA
ICCH
A to B
VCC = 5.5 V
33
53
33
53
mA
ICCZ
VCC = 5.5 V
6
11
6
11
mA
Ci
OEAB or OEBA
VCC = 5 V,
VI = 2.5 V or 0.5 V
5
5
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.
SN54BCT623, SN74BCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS020A SEPTEMBER 1988 REVISED NOVEMBER 1993
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Note 2)
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
BCT623
SN54BCT623
SN74BCT623
MIN
TYP
MAX
MIN
MAX
MIN
MAX
tPLH
A
B
0.5
3.1
4.7
0.5
5.3
0.5
5.2
ns
tPHL
A
B
1.7
4.9
6.9
1.7
7.6
1.7
7.4
ns
tPLH
B
A
0.9
4.1
5.9
0.9
6.8
0.9
6.7
ns
tPHL
B
A
1.8
5.3
7.6
1.8
8.3
1.8
8
ns
tPZH
OEBA
A
3.1
6.8
9.1
3.1
10.7
3.1
10.6
ns
tPZL
OEBA
A
3.3
7.2
9.6
3.3
11.3
3.3
10.7
ns
tPHZ
OEBA
A
1.9
6.1
8.3
1.9
10.6
1.9
9.8
ns
tPLZ
OEBA
A
1.1
4.6
7
1.1
8.1
1.1
7.8
ns
tPZH
OEAB
B
2
5
6.8
2
7.8
2
7.6
ns
tPZL
OEAB
B
2.7
6.2
8
2.7
9.3
2.7
8.9
ns
tPHZ
OEAB
B
1.1
4.6
6.5
1.1
8
1.1
7.7
ns
tPLZ
OEAB
B
0.3
3.2
6.3
0.3
7.2
0.3
7.1
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
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Copyright
1998, Texas Instruments Incorporated
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