SN54BCT620A, SN74BCT620A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS001B – SEPTEMBER 1987 – REVISED NOVEMBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• P-N-P Inputs Reduce DC Loading
• 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 ′BCT620A bus transceiver is designed for
asynchronous communication between data
buses. The control function implementation allows
for maximum flexibility in timing. The ′BCT620A
provides inverted data at its outputs.
These devices allow 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
. 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. In this way , each output
reinforces its input in this configuration.
The SN54BCT620A is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT620A is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
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
SN54BCT620A ...J OR W PACKAGE
SN74BCT620A . . . 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
SN54BCT620A . . . FK PACKAGE
(TOP VIEW)
A2A1OEAB
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.
SN54BCT620A, SN74BCT620A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS001B – SEPTEMBER 1987 – REVISED NOVEMBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
2
A1 B1
EN1
19
EN2
1
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
OEAB
1
To Seven Other Channels
OEBA
OEAB
19
1
182
1
1
†
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, IIK –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54BCT620A 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT620A 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54BCT620A – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT620A 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
SN54BCT620A SN74BCT620A
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
IK
Input clamp current –18 –18 mA
p
A port –3 –3
IOHHigh-level output current
B port –12 –15
mA
p
A port 20 24
IOLLow-level output current
B port 48 64
mA
T
A
Operating free-air temperature –55 125 0 70 °C
SN54BCT620A, SN74BCT620A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS001B – SEPTEMBER 1987 – REVISED NOVEMBER 1993
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54BCT620A SN74BCT620A
PARAMETER
TEST CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
V
IK
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
p
IOH = –1 mA 2.5 3.4 2.5 3.4
A port
V
CC
= 4.5
V
IOH = –3 mA 2.4 3.3 2.4 3.3
V
OH
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
p
IOL = 20 mA 0.3 0.5
A port
V
CC
= 4.5
V
IOL = 24 mA 0.35 0.5
V
OL
p
IOL = 48 mA 0.38 0.55
V
B port
V
CC
= 4.5
V
IOL = 64 mA 0.42 0.55
A or B port
1 1
I
I
OEAB or OEBA
V
CC
= 5.5 V,
V
I
= 5.5
V
0.1 0.1
mA
A or B port
70 70
I
IH
‡
OEAB or OEBA
V
CC
= 5.5 V,
V
I
= 2.7
V
20 20
µ
A
A or B port
–0.65 –0.65
I
IL
‡
OEAB or OEBA
V
CC
= 5.5 V,
V
I
= 0.5
V
–0.6 –0.6
mA
A port
–60 –150 –60 –150
I
OS
§
B port
V
CC
= 5.5 V,
V
O
=
0
–100 –225 –100 –225
mA
I
CCL
A to B VCC = 5.5 V 53 84 53 84 mA
I
CCH
A to B VCC = 5.5 V 23 37 23 37 mA
I
CCZ
VCC = 5.5 V 4 10 4 10 mA
C
i
OEAB or OEBA VCC = 5 V, VI = 2.5 V or 0.5 V 5 5 pF
A to B
9 9
p
C
io
B to A
V
CC
= 5 V,
V
O
= 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.
SN54BCT620A, SN74BCT620A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS001B – SEPTEMBER 1987 – REVISED NOVEMBER 1993
2–4
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 Ω,
R2 = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX
†
UNIT
′BCT620A SN54BCT620A SN74BCT620A
MIN TYP MAX MIN MAX MIN MAX
t
PLH
0.6 3.4 5.2 0.6 6.2 0.6 5.8
t
PHL
A
B
0.1 1.9 3.4 0.1 3.7 0.1 3.6
ns
t
PLH
0.9 4.1 6 0.9 7.2 0.9 6.9
t
PHL
B
A
0.1 2 3.7 0.1 4 0.1 3.9
ns
t
PZH
3.5 7.2 9.2 3.5 10.9 3.5 10.6
t
PZL
OEBA
A
3.7 7.6 9.9 3.7 11.5 3.7 11.1
ns
t
PHZ
3.1 5.3 8.6 3.1 10.8 3.1 10
t
PLZ
OEBA
A
1.3 4.4 6.9 1.3 8.3 1.3 7.8
ns
t
PZH
2 5.3 6.7 2 7.9 2 7.4
t
PZL
OEAB
B
2.9 6.1 8.1 2.9 9.2 2.9 9
ns
t
PHZ
2.1 5.2 7 2.1 8.5 2.1 8.1
t
PLZ
OEAB
B
0.1 3.7 5.3 0.1 6 0.1 5.9
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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