SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016C – MARCH 1984 – REVISED MARCH 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Operating Voltage Range of 4.5 V to 5.5 V
D
Low Power Consumption, 80-µA Max ICC
D
Typical tpd = 11 ns
D
±6-mA Output Drive at 5 V
D
Low Input Current of 1 µA Max
D
Inputs Are TTL-Voltage Compatible
D
Lock Bus-Latch Capability
D
True Logic
D
High-Current 3-State Outputs Can Drive Up
To 15 LSTTL Loads
SN54HCT623 ...J OR W PACKAGE
SN74HCT623 . . . DW OR N PACKAGE
(TOP VIEW)
SN54HCT623 . . . 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
VCC
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
A2
A1
OEAB
B7
B6 V
OEBA
A8
GND
B8 CC
description/ordering information
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 ’HCT623 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 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.
To ensure the high-impedance state during power up or power down, OEBA should be tied to VCC through a
pullup resistor and OEAB should be tied to GND through a pulldown resistor; the minimum value of the resistor
is determined by the current-sinking/current-sourcing capability of the driver.
ORDERING INFORMATION
TAPACKAGE†ORDERABLE
PART NUMBER TOP-SIDE
MARKING
40°Cto85°C
PDIP – N Tube SN74HCT623N SN74HCT623N
–
40°C
to
85°C
SOIC – DW Tube SN74HCT623DW HCT623
CDIP – J Tube SNJ54HCT623J SNJ54HCT623J
–55°C to 125°CCFP – W Tube SNJ54HCT623W SNJ54HCT623W
LCCC – FK Tube SNJ54HCT623FK SNJ54HCT623FK
†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright 2003, 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.
SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016C – MARCH 1984 – REVISED MARCH 2003
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
INPUTS
OPERATION
OEBA OEAB
OPERATION
L L B data to A bus
HH A data to B bus
H L Isolation
L H B data to A bus,
A data to B bus
logic diagram (positive logic)
A1 B1
OEBA
OEAB
To Seven Other Transceivers
19
1
218
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (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 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –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 af fect 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 51-7.
SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016C – MARCH 1984 – REVISED MARCH 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HCT623 SN74HCT623
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 VCC = 4.5 V to 5.5 V 2 2 V
VIL Low-level input voltage VCC = 4.5 V to 5.5 V 0.8 0.8 V
VIInput voltage 0 VCC 0 VCC V
VOOutput voltage 0 VCC 0 VCC V
ttInput transition (rise and fall) time 500 500 ns
TAOperating free-air temperature –55 125 –40 85 °C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25°C SN54HCT623 SN74HCT623
UNIT
PARAMETER
TEST
CONDITIONS
V
CC MIN TYP MAX MIN MAX MIN MAX
UNIT
VOH
VI=V
IH or VIL
IOH = –20 µA
45V
4.4 4.499 4.4 4.4
V
V
OH
V
I =
V
IH
or
V
IL IOH = –6 mA
4
.
5
V
3.98 4.3 3.7 3.84
V
VOL
VI=V
IH or VIL
IOL = 20 µA
45V
0.001 0.1 0.1 0.1
V
V
OL
V
I =
V
IH
or
V
IL IOL = 6 mA
4
.
5
V
0.17 0.26 0.4 0.33
V
IIOEAB or
OEBA VI = VCC or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
IOZ A or B VO = VCC or GND 5.5 V ±0.01 ±0.5 ±10 ±5µA
ICC VI = VCC or 0, IO = 0 5.5 V 8 160 80 µA
∆ICC†One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC 5.5 V 1.4 2.4 3 2.9 mA
CiOEAB or
OEBA 4.5 V
to 5.5 V 3 10 10 10 pF
†This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC.
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
VCC
TA = 25°C SN54HCT623 SN74HCT623
UNIT
PARAMETER
(INPUT) (OUTPUT)
V
CC MIN TYP MAX MIN MAX MIN MAX
UNIT
td
AorB
BorA
4.5 V 15 22 33 28
ns
t
pd
A
or
B
B
or
A
5.5 V 13 20 30 25
ns
t
OEBA
A
4.5 V 30 42 63 53
ns
t
en
OEBA
A
5.5 V 23 38 57 48
ns
tdi
OEBA
A
4.5 V 18 30 45 38
ns
t
dis
OEBA
A
5.5 V 16 28 42 35
ns
t
OEAB
B
4.5 V 30 42 63 53
ns
t
en
OEAB
B
5.5 V 23 38 57 48
ns
tdi
OEAB
B
4.5 V 18 30 45 38
ns
t
dis
OEAB
B
5.5 V 16 28 42 35
ns
tt
AorB
4.5 V 9 12 18 15
ns
t
t
A
or
B
5.5 V 811 16 14
ns
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.
SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016C – MARCH 1984 – REVISED MARCH 2003
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
VCC
TA = 25°C SN54HCT623 SN74HCT623
UNIT
PARAMETER
(INPUT) (OUTPUT)
V
CC MIN TYP MAX MIN MAX MIN MAX
UNIT
td
AorB
BorA
4.5 V 18 38 58 47
ns
t
pd
A
or
B
B
or
A
5.5 V 11 34 52 42
ns
OEBA
A
4.5 V 36 59 89 74
t
OEBA
A
5.5 V 30 53 80 67
ns
t
en
OEAB
B
4.5 V 36 59 89 74
ns
OEAB
B
5.5 V 30 53 80 67
tt
AorB
4.5 V 17 42 63 53
ns
t
t
A
or
B
5.5 V 14 38 57 48
ns
operating characteristics, TA = 25°C
PARAMETER TEST CONDITIONS TYP UNIT
Cpd 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.
SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016C – MARCH 1984 – REVISED MARCH 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
RL
VCC
S1
S2
LOAD CIRCUIT
PARAMETER CL
tPZH
tpd or tt
tdis
ten tPZL
tPHZ
tPLZ
1 kΩ
1 kΩ
50 pF
or
150 pF
50 pF
Open Closed
RLS1
Closed Open
S2
Open Closed
Closed Open
50 pF
or
150 pF Open Open––
NOTES: A. CL includes probe and test-fixture capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
W aveform 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. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
CL
(see Note A)
Test
Point
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
1.3 V1.3 V 0.3 V0.3 V 2.7 V 2.7 V 3 V
0 V
trtf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES
1.3 V
1.3 V1.3 V 10%10% 90% 90%
3 V
VOH
VOL
0 V
trtf
Input
In-Phase
Output
1.3 V
tPLH tPHL
1.3 V 1.3 V
10% 10% 90%90% VOH
VOL
tr
tf
tPHL tPLH
Out-of-
Phase
Output
1.3 V
10%
90%
3 V
≈VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
W aveform 1
(See Note B)
1.3 V
tPZL tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
≈0 V
1.3 V
1.3 V
tPZH tPHZ
Output
W aveform 2
(See Note B)
Figure 1. Load Circuit and Voltage Waveforms
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
SN74HCT623DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT623DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT623DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT623DWR OBSOLETE SOIC DW 20 TBD Call TI Call TI
SN74HCT623N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74HCT623NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 18-Sep-2008
Addendum-Page 1
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