SN74LS245 TRANSCEIVER Datasheet

SN74LS245 Datasheet, PDF, Equivalent


Part Number

SN74LS245

Description

OCTAL BUS TRANSCEIVER

Manufacture

Motorola

Total Page 4 Pages
Datasheet
Download SN74LS245 Datasheet


SN74LS245
OCTAL BUS TRANSCEIVER
The SN54 / 74LS245 is an Octal Bus Transmitter/Receiver designed for
8-line asynchronous 2-way data communication between data buses.
Direction Input (DR) controls transmission of Data from bus A to bus B or bus
B to bus A depending upon its logic level. The Enable input (E) can be used
to isolate the buses.
Hysteresis Inputs to Improve Noise Immunity
2-Way Asynchronous Data Bus Communication
Input Diodes Limit High-Speed Termination Effects
ESD > 3500 Volts
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
VCC E 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
TRUTH TABLE
INPUTS
E DIR
OUTPUT
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X Isolation
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
SN54/74LS245
OCTAL BUS TRANSCEIVER
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
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
FAST AND LS TTL DATA
5-398

SN74LS245
SN54 / 74LS245
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
0.7 Guaranteed Input LOW Voltage for
0.8 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
A or B, DR or E
Input HIGH Current DR or E
A or B
Input LOW Current
Output Short Circuit Current (Note 1)
Power Supply Current
Total, Output HIGH
Total, Output LOW
– 40
20
– 200
20
0.1
0.1
– 0.2
– 225
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
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.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V, TRISE / TFALL 6.0 ns)
Limits
Symbol
Parameter
Min Typ Max
tPLH
tPHL
Propagation Delay, Data to Output
8.0 12
8.0 12
tPZH
Output Enable Time to HIGH Level
25 40
tPZL
Output Enable Time to LOW Level
27 40
tPLZ
Output Disable Time from LOW Level
15 25
tPHZ
Output Disable Time from HIGH Level
15 25
Unit
ns
ns
ns
ns
ns
Test Conditions
CL = 45 pF,
RL = 667
CL = 5.0 pF,
RL = 667
FAST AND LS TTL DATA
5-399


Features OCTAL BUS TRANSCEIVER The SN54 / 74LS245 is an Octal Bus Transmitter/Receiver d esigned for 8-line asynchronous 2-way d ata communication between data buses. D irection Input (DR) controls transmissi on of Data from bus A to bus B or bus B to bus A depending upon its logic leve l. The Enable input (E) can be used to isolate the buses. • Hysteresis Input s to Improve Noise Immunity • 2-Way A synchronous Data Bus Communication • Input Diodes Limit High-Speed Terminati on Effects • ESD > 3500 Volts LOGIC A ND CONNECTION DIAGRAMS DIP (TOP VIEW) V CC E B1 B2 B3 B4 B5 B6 B7 B8 20 19 18 1 7 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 TRU TH TABLE INPUTS E DIR OUTPUT L L Bus B Data to Bus A L H Bus A Data to Bus B H X Isolation H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial S N54/74LS245 OCTAL BUS TRANSCEIVER LOW POWER SCHOTTKY 20 1 20 1 20 1 J SUFFI X CERAMIC CASE 732-03 N SUFFIX PLASTIC CASE 738-03 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION S.
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