SCLS149A- DECEMBER 1982 REVISED JANUARY 1996 Lock Bus-Latch Capab
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SN54HC623, SN74HC623 OCTAL TRANSCEIVERS WITH 3-STATE OUTPUTS
SCLS149A- DECEMBER 1982 REVISED JANUARY 1996
Lock Bus-Latch Capability True Logic
High-Current 3-State Outputs Drive LSTTL Loads
Package Options Include Plastic Small-Outline (DW) Ceramic Flat Packages, Ceramic Chip Carriers (FK), Standard Plastic Ceramic 300-mil DIPs
These octal transceivers designed asynchronous two-way communication between data buses. control-function implementation allows maximum flexibility timing.
'HC623 allow data transmission from from bus, depending upon logic levels output-enable (OEAB OEBA) inputs.
SN54HC623 PACKAGE SN74HC623 PACKAGE (TOP VIEW)
]vcc
OEAB
OEBA
SN54HC623 PACKAGE
(TOP VIEW)
I_11_II_II_II_1
OEAB OEBA disable device that buses effectively isolated. dual-enable configuration gives transceivers capability store data simultaneously enabling OEAB OEBA. Each output reinforces input this transceiver configuration. When both OEAB OEBA enabled other data sources sets lines high-impedance state, both sets lines total) remain their last states. 8-bit codes appearing sets buses identical.
SN54HC623 characterized operation over full military temperature range SN74HC623 characterized operation from
FUNCTION TABLE
INPUTS OPERATION
OEBA OEAB
data data Isolation data bus, data
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unless otherwise noted this document contains production Copyright 1996, Texas Instruments Incorporated
data information current publication date. Products conform ^^PfV
specifications terms Texas Instruments standard warranty.
Production processing does necessarily include testing IIaA^J
parameters. instruments
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SN54HC623, SN74HC623 OCTAL TRANSCEIVERS WITH 3-STATE OUTPUTS
SCLS149A- DECEMBER 1982 REVISED JANUARY
logic symbolt
OEBA OEAB
tThis symbol accordance with ANSI/IEEE 91-1984 Publication 617-12.
logic diagram (positive logic)
OEBA OEAB
N-V-'
Seven Other Transceivers
absolute maximum ratings over operating free-air temperature ranged
Supply voltage range, -0.5
Input clamp current, Vcc) (see Note
Output clamp current, Vcc) (see Note
Continuous output current, Vcc)
Continuous current through
Maximum power dissipation still air) (see Note package .1.6
package .1.3
Storage temperature range, Tstg
Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. NOTES: input output voltage ratings exceeded input output current ratings observed.
maximum package power dissipation calculated using junction temperature board trace length mils, except package, which trace length zero.
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SN54HC623, SN74HC623 OCTAL TRANSCEIVERS WITH 3-STATE OUTPUTS
SCLS149A- DECEMBER 1982 REVISED JANUARY 1996
recommended operating conditions
SN54HC623 SN74HC623 UNIT
Supply voltage
High-level input voltage
3.15 3.15
V||_ Low-level input voltage .;!?
ji?' 1.35 1.35
Input voltage
Output voltage
Input transition (rise fall) time 1000 1000
Operating free-air temperature
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS SN54HC623 SN74HC623 UNIT
=v|horv|l 1.998
4.499
5.999
3.98 3.84
-7-8 5.48 5.34
=v|horv|l 0.002
0.001 il'-'
0.001
0.17 0.26 0.33
0.15 0.26 0.33
oeab oeba
V|=VCcor0,
oeab oeba
PRODUCT PREVIEW information concerns products formative
Texas
design phase development. Characteristic data other ^^PffV
specifications design goals. Texas Instruments reserves right
change discontinue these products without notice.
Instruments
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SN54HC623, SN74HC623 OCTAL TRANSCEIVERS WITH 3-STATE OUTPUTS
SCLS149A- DECEMBER 1982 REVISED JANUARY
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
PARAMETER FROM SN54HC623 SN74HC623 UNIT
(INPUT) (OUTPUT)
OEBA
'dis OEBA
OEAB
'dis OEAB
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
PARAMETER FROM SN54HC623 SN74HC623 UNIT
(INPUT) (OUTPUT)
OEBA J;''
,.:0'
OEAB
operating characteristics,
PARAMETER TEST CONDITIONS UNIT
Power dissipation capacitance transceiver load
PRODUCT PREVIEW information concerns products formative
Texas
design phase development Characteristic data other specifications design goals. Texas Instruments reserves right
change discontinue these products without notice.
Instruments
POST OFFICE 655303 DALLAS, TEXAS 75265
This Material Copyrighted Respective Manufacturer
SN54HC623, SN74HC623 OCTAL TRANSCEIVERS WITH 3-STATE OUTPUTS
SCLS149A- DECEMBER 1982 REVISED JANUARY 1996
PARAMETER MEASUREMENT INFORMATION
From Output Under Test
(see Note
LOAD CIRCUIT
PARAMETER
tpZH Open Closed
lPZL Closed Open
*dis tPHZ Open Closed
Closed Open
Open Open
'nPUt 10%-If
Viskov
VOLTAGE WAVEFORM INPUT RISE FALL TIMES
Input
In-Phase Output
Out-of-Phase Output
Output Control (Low-Level Enabling)
Output Waveform
(See Note
lPZL
tpZH
Output Waveform (See Note
VOLTAGE WAVEFORMS PROPAGATION DELAY OUTPUT TRANSITION TIMES
VOLTAGE WAVEFORMS ENABLE DISABLE TIMES 3-STATE OUTPUTS
NOTES: includes probe test-fixture capacitance.
Waveform output with internal conditions such that output except when disabled output control. Waveform output with internal conditions such that output high except when disabled output control.
Phase relationships between waveforms were chosen arbitrarily. input pulses supplied generators having following characteristics: MHz,
outputs measured time with input transition measurement.
tp|_z tpHZ same tdis-
tpzL tpzH same ten. tp|_H tpHL same tpd-
Figure Load Circuit Voltage Waveforms
Texas Instruments
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