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Motorola Electronic Components Datasheet

SN74LS623 Datasheet

OCTAL BUS TRANSCEIVER

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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
implementation allows maximum timing flexibility. Enable inputs may be used
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
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.
CONNECTION DIAGRAM (TOP VIEW)
ENABLE
VCC GBA B1 B2 B3 B4 B5 B6 B7 B8
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
ENABLE A1 A2 A3 A4 A5 A6 A7 A8 GND
GAB
BLOCK DIAGRAM
1/4 LS623
GBA
GAB
A1 B1
SN54/74LS623
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUT
LOW POWER SCHOTTKY
20
1
20
1
20
1
J SUFFIX
CERAMIC
CASE 732-03
N SUFFIX
PLASTIC
CASE 738-03
DW SUFFIX
SOIC
CASE 751D-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
A2 B2
TO OTHER SIX
TRANSCEIVERS
FUNCTION TABLE
ENABLE INPUTS
OPERATION
GBA
GAB
LS623
LL
B data to A bus
HH
A data to B bus
HL
Isolation
B data to A bus,
LH
A data to B bus
H = HIGH Level, L = LOW Level, X = Irrelevant
FAST AND LS TTL DATA
5-1


Motorola Electronic Components Datasheet

SN74LS623 Datasheet

OCTAL BUS TRANSCEIVER

No Preview Available !

SN54 / 74LS623
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 3.0
mA
54 –12 mA
74 –15
54 12 mA
74 24
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage
54
74
0.5 Guaranteed Input LOW Voltage for
0.6 V All Inputs
VT+–VT–
VIK
Hysteresis
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
54, 74
54, 74
54, 74
74
0.2 0.4
– 0.65 – 1.5
2.4 3.4
2.0
0.25 0.4
0.35 0.5
V VCC = MIN
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = ± 3.0 mA
V VCC = MIN, IOH = MAX
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
IOZH
IOZL
IIH
IIL
IOS
ICC
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
A, or B, GBA or
GAB
GAB or GAB
A or B
Input LOW Current
Short Circuit Current (Note 1)
Power Supply Current
Total Output HIGH
Total Output LOW
– 40
20
– 400
20
0.1
0.1
– 0.4
– 225
µA VCC = MAX, VOUT = 2.7 V
µA VCC = MAX, VOUT = 4.0 V
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 5.5 V
mA VCC = MAX, VIN = 0.4 V
mA VCC = MAX
70
90 mA VCC = MAX
Total at HIGH Z
95
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-2


Part Number SN74LS623
Description OCTAL BUS TRANSCEIVER
Maker Motorola
Total Page 3 Pages
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