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SN54/74LS623
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUT
The SN54 / 74LS623 series is an octal bus transceiver designed for
asynchronous two-way communication between data buses. Control function OCTAL BUS TRANSCEIVER
implementation allows maximum timing flexibility. Enable inputs may be used WITH 3-STATE OUTPUT
to disable the device so that buses are effectively isolated. Depending on the
Logic Levels at the enable inputs, Data transmission is allowed from the A bus LOW POWER SCHOTTKY
to the B bus or from the B bus to the A bus. The dual-enable configuration
gives the LS623 the capability to store data by simultaneous enabling of GBA
and GAB. Each output reinforces its input in this transceiver configuration.
Thus, when both control inputs are enabled all other data sources to the two
sets of bus lines (16 in all) will remain at their last states.
J SUFFIX
CERAMIC
CASE 732-03
20
1
CONNECTION DIAGRAM (TOP VIEW)
ENABLE
N SUFFIX
VCC GBA B1 B2 B3 B4 B5 B6 B7 B8
PLASTIC
20 19 18 17 16 15 14 13 12 11 CASE 738-03
20
1
DW SUFFIX
SOIC
20
CASE 751D-03
1 2 3 4 5 6 7 8 9 10 1
ENABLE A1 A2 A3 A4 A5 A6 A7 A8 GND
GAB
BLOCK DIAGRAM ORDERING INFORMATION
SN54LSXXXJ Ceramic
1/4 LS623 SN74LSXXXN Plastic
SN74LSXXXDW SOIC
GBA
GAB
A1 B1
FUNCTION TABLE
A2 ENABLE INPUTS OPERATION
B2
GBA GAB LS623
L L B data to A bus
H H A data to B bus
TO OTHER SIX H L Isolation
TRANSCEIVERS
B data to A bus,
L H A data to B bus
H = HIGH Level, L = LOW Level, X = Irrelevant
FAST AND LS TTL DATA
5-1
SN54/74LS623
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54 4.5 5.0 5.5 V
74 4.75 5.0 5.25
TA Operating Ambient Temperature Range 54