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Motorola Electronic Components Datasheet

SN54LS641 Datasheet

OCTAL BUS TRANSCEIVERS

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OCTAL BUS TRANSCEIVERS
These octal bus transceivers are designed for asynchronous two-way
communication between data buses. Control function implementation
minimizes external timing requirements. These circuits allow data transmis-
sion from the A bus to B or from the B bus to A bus depending upon the logic
level of the direction control (DIR) input. Enable input (G) can disable the
device so that the buses are effectively isolated.
DEVICE
LS640
LS641
LS642
LS645
OUTPUT
3-State
Open-Collector
Open-Collector
3-State
LOGIC
Inverting
True
Inverting
True
FUNCTION TABLE
CONTROL
INPUTS
G DIR
LS640
LS642
OPERATION
LS641
LS645
LL
B data to A bus
B data to A bus
LH
A data to B bus
A data to B bus
HX
Isolation
Isolation
H = HIGH Level, L = LOW Level, X = Irrelevant
SN54/74LS640
SN54/74LS641
SN54/74LS642
SN54/74LS645
OCTAL BUS TRANSCEIVERS
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
CONNECTION DIAGRAMS DIP (TOP VIEW)
ENABLE
VCC G B1 B2 B3 B4 B5 B6 B7 B8
20 19 18 17 16 15 14 13 12 11
ENABLE
VCC G 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
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
SN54 / 74LS640
SN54 / 74LS642
1 2 3 4 5 6 7 8 9 10
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
SN54 / 74LS641
SN54 / 74LS645
FAST AND LS TTL DATA
5-1


Motorola Electronic Components Datasheet

SN54LS641 Datasheet

OCTAL BUS TRANSCEIVERS

No Preview Available !

SN54/74LS640 SN54/74LS645
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC
Supply Voltage
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
TA Operating Ambient Temperature Range
54 – 55 25 125 °C
74 0 25 70
IOH Output Current — High
54, 74
54
74
– 3.0
–12
–15
mA
mA
IOL Output Current — Low
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
VIK
VOH
VOL
IOZH
IOZL
IIH
IIL
IOS
ICC
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
54, 74
54, 74
Output LOW Voltage
54, 74
74
Output Off Current HIGH
Output Off Current LOW
A or B, DIR or G
Input HIGH Current DIR or G
A or B
Input LOW Current
Output Short Circuit Current (Note 1)
Power Supply Current
Total Output HIGH
Total, Output LOW
0.5
0.6
– 0.65 – 1.5
2.4 3.4
2.0
0.25 0.4
0.35 0.5
20
– 400
20
0.1
0.1
– 0.4
– 40 – 225
70
90
V
Guaranteed Input LOW Voltage for
All Inputs
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
µA VCC = MAX, VOUT = 2.7 V
µA VCC = MAX, VOUT = 0.4 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
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.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
LS640
LS645
Symbol
Parameter
Min Typ Max Min Typ Max Unit
Test Conditions
tPLH
tPHL
tPLH
tPHL
tPZL
tPZH
tPZL
tPZH
tPLZ
tPHZ
tPLZ
tPHZ
Propagation Delay
A to B
Propagation Delay
B to A
Output Enable Time
G, DIR to A
Output Enable Time
G, DIR to B
Output Disable Time
G, DIR to A
Output Disable Time
G, DIR to B
6.0 10
8.0 15
6.0 10
8.0 15
31 40
23 40
31 40
23 40
15 25
15 25
15 25
15 25
8.0
11
15
15
ns
8.0
11
15
15
ns
31 40
26 40 ns
31
26
40
40
ns
15 25
15 25 ns
15 25
15 25 ns
CL = 45 pF,
RL = 667
CL = 5.0 pF
FAST AND LS TTL DATA
5-2


Part Number SN54LS641
Description OCTAL BUS TRANSCEIVERS
Maker Motorola Inc
Total Page 3 Pages
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