SN54HC623, SN74HC623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS149B – DECEMBER 1982 – REVISED MA Y 1997
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Lock Bus-Latch Capability
D
True Logic
D
High-Current 3-State Outputs Can Drive up
to 15 LSTTL Loads
D
Package Options Include Plastic
Small-Outline (DW) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
description
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. The control-function implementation
allows for maximum flexibility in timing.
The ’HC623 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.
OEAB and OEBA disable the device so that the
buses are effectively isolated. The dual-enable
configuration gives the transceivers the capability
to store data by simultaneously enabling OEAB
and OEBA
. Each output reinforces its input in this
transceiver configuration. When both OEAB and
OEBA are enabled and all other data sources to
the two sets of bus lines are in the high-impedance
state, both sets of bus lines (16 total) remain at
their last states. The 8-bit codes appearing on the
two sets of buses are identical.
The SN54HC623 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74HC623 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OEBA OEAB
OPERATION
L L B data to A bus
H H A data to B bus
H L Isolation
L H
B data to A bus,
A data to B bus
Copyright 1997, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SN54HC623 ...J OR W PACKAGE
SN74HC623 . . . DW OR N PACKAGE
(TOP VIEW)
SN54HC623 . . . FK PACKAGE
(TOP VIEW)
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
3212019
910111213
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
A2A1OEAB
B7
B6
V
OEBA
A8
GND
B8
CC
SN54HC623, SN74HC623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS149B – DECEMBER 1982 – REVISED MA Y 1997
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
2
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
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
A1
B1
OEBA
OEAB
To Seven Other Transceivers
19
1
218
absolute maximum ratings over operating free-air temperature range
‡
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO (VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): DW package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–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. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
SN54HC623, SN74HC623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS149B – DECEMBER 1982 – REVISED MA Y 1997
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54HC623 SN74HC623
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 2 5 6 2 5 6 V
VCC = 2 V 1.5 1.5
V
IH
High-level input voltage
VCC = 4.5 V
3.15 3.15
V
VCC = 6 V 4.2 4.2
VCC = 2 V 0 0.5 0 0.5
V
IL
Low-level input voltage
VCC = 4.5 V
0 1.35 0 1.35
V
VCC = 6 V 0 1.8 0 1.8
V
I
Input voltage 0 V
CC
0 V
CC
V
V
O
Output voltage 0 V
CC
0 V
CC
V
VCC = 2 V 0 1000 0 1000
t
t
Input transition (rise and fall) time
VCC = 4.5 V
0 500 0 500
ns
VCC = 6 V 0 400 0 400
T
A
Operating free-air temperature –55 125 –40 85 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
TA = 25°C SN54HC623 SN74HC623
PARAMETER
TEST CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 1.9 1.998 1.9 1.9
IOH = –20 µA
4.5 V 4.4 4.499 4.4 4.4
V
OH
VI = VIH or V
IL
6 V 5.9 5.999 5.9 5.9
V
IOH = –6 mA 4.5 V 3.98 4.3 3.7 3.84
IOH = –7.8 mA 6 V 5.48 5.8 5.2 5.34
2 V 0.002 0.1 0.1 0.1
IOL = 20 µA
4.5 V 0.001 0.1 0.1 0.1
V
OL
VI = VIH or V
IL
6 V 0.001 0.1 0.1 0.1
V
IOL = 6 mA 4.5 V 0.17 0.26 0.4 0.33
IOL = 7.8 mA 6 V 0.15 0.26 0.4 0.33
I
I
OEAB or
OEBA
VI = VCC or 0 6 V ±0.1 ±100 ±1000 ±1000 nA
I
OZ
A or B VO = VCC or 0 6 V ±0.01 ±0.5 ±10 ±5 µA
I
CC
VI = VCC or 0, IO = 0 6 V 8 160 80 µA
C
i
OEAB or
OEBA
2 V to 6 V 3 10 10 10 pF
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
SN54HC623, SN74HC623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS149B – DECEMBER 1982 – REVISED MA Y 1997
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
FROM TO
TA = 25°C SN54HC623 SN74HC623
PARAMETER
(INPUT) (OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 29 105 160 130
t
pd
A or B B or A
4.5 V 10 21 32 26
ns
6 V 8 18 27 22
2 V 112 210 315 265
t
en
OEBA A
4.5 V 27 42 63 53
ns
6 V 20 36 54 45
2 V 40 150 225 190
t
dis
OEBA A
4.5 V 18 30 45 38
ns
6 V 16 26 38 32
2 V 112 210 315 265
t
en
OEAB B
4.5 V 27 42 63 53
ns
6 V 20 36 54 45
2 V 40 150 225 190
t
dis
OEAB B
4.5 V 18 30 45 38
ns
6 V 16 26 38 32
2 V 20 60 90 75
t
t
A or B
4.5 V 8 12 18 15
ns
6 V 6 10 15 13
switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 1)
FROM TO
TA = 25°C SN54HC623 SN74HC623
PARAMETER
(INPUT) (OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 44 135 200 170
t
pd
A or B B or A
4.5 V 14 27 40 34
ns
6 V 11 23 34 29
2 V 130 270 405 335
OEBA A
4.5 V 31 54 81 67
ns
6 V 23 46 69 56
t
en
2 V 130 270 405 335
OEAB B
4.5 V 31 54 81 67
ns
6 V 23 46 69 56
2 V 45 210 315 265
t
t
A or B
4.5 V 17 42 63 53
ns
6 V 13 36 53 45
operating characteristics, TA = 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance per transceiver No load 40 pF
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
SN54HC623, SN74HC623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS149B – DECEMBER 1982 – REVISED MA Y 1997
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%50%
10%10%
90% 90%
V
CC
0 V
t
r
t
f
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%50%
10%10%
90% 90%
V
CC
V
OH
V
OL
0 V
t
r
t
f
Input
In-Phase
Output
50%
t
PLH
t
PHL
50% 50%
10% 10%
90%90%
V
OH
V
OL
t
r
t
f
t
PHL
t
PLH
Out-of-
Phase
Output
50%
10%
90%
V
CC
≈ V
CC
V
OL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
50%
t
PZL
t
PLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
V
OH
≈ 0 V
50%
50%
t
PZH
t
PHZ
Output
Waveform 2
(See Note B)
≈ V
CC
Test
Point
From Output
Under Test
R
L
V
CC
S1
S2
LOAD CIRCUIT
PARAMETER C
L
t
PZH
tpd or t
t
t
dis
t
en
t
PZL
t
PHZ
t
PLZ
1 kΩ
1 kΩ
50 pF
or
150 pF
50 pF
Open Closed
R
L
S1
Closed Open
S2
Open Closed
Closed Open
50 pF
or
150 pF
Open Open––
NOTES: A. CL includes probe and test-fixture capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. t
PLZ
and t
PHZ
are the same as t
dis
.
F. t
PZL
and t
PZH
are the same as ten.
G. t
PLH
and t
PHL
are the same as tpd.
C
L
(see Note A)
Figure 1. Load Circuit and Voltage Waveforms
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Copyright 1998, Texas Instruments Incorporated
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