MOTOROLA SN74LS245H, SN74LS245M, SN74LS245MEL, SN74LS245ML1, SN74LS245ML2 Datasheet
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SN74LS245
Octal Bus Transceiver
The SN74LS245 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 |
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E |
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B1 |
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B2 |
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B3 |
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B4 |
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B5 |
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B6 |
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B7 |
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B8 |
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20 |
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17 |
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16 |
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1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
DIR |
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A1 |
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A2 |
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A3 |
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A4 |
A5 |
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A6 |
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A7 |
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A8 |
GND |
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TRUTH TABLE
INPUTS |
OUTPUT |
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DIR |
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E |
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L |
L |
Bus B Data to Bus A |
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L |
H |
Bus A Data to Bus B |
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H |
X |
Isolation |
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H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
GUARANTEED OPERATING RANGES
Symbol |
Parameter |
Min |
Typ |
Max |
Unit |
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VCC |
Supply Voltage |
4.75 |
5.0 |
5.25 |
V |
TA |
Operating Ambient |
0 |
25 |
70 |
°C |
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Temperature Range |
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IOH |
Output Current ± High |
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± 3.0 |
mA |
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± 15 |
mA |
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IOL |
Output Current ± Low |
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24 |
mA |
http://onsemi.com
LOW
POWER
SCHOTTKY
20 
1
PLASTIC
N SUFFIX
CASE 738
20
1
SOIC
DW SUFFIX
CASE 751D
ORDERING INFORMATION
Device |
Package |
Shipping |
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SN74LS245N |
16 Pin DIP |
1440 Units/Box |
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SN74LS245DW |
16 Pin |
2500/Tape & Reel |
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Semiconductor Components Industries, LLC, 1999 |
1 |
Publication Order Number: |
December, 1999 ± Rev. 6 |
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SN74LS245/D |
SN74LS245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
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Limits |
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Symbol |
Parameter |
Min |
Typ |
Max |
Unit |
Test Conditions |
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VIH |
Input HIGH Voltage |
2.0 |
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V |
Guaranteed Input HIGH Voltage for |
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All Inputs |
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VIL |
Input LOW Voltage |
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0.8 |
V |
Guaranteed Input LOW Voltage for |
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All Inputs |
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VT+±VT± |
Hysteresis |
0.2 |
0.4 |
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V |
VCC = MIN |
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VIK |
Input Clamp Diode Voltage |
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± 0.65 |
± 1.5 |
V |
VCC = MIN, IIN = ± 18 mA |
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VOH |
Output HIGH Voltage |
2.4 |
3.4 |
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V |
VCC = MIN, IOH = ± 3.0 mA |
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2.0 |
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V |
VCC = MIN, IOH = MAX |
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0.25 |
0.4 |
V |
I = 12 mA |
VCC = VCC MIN, |
VOL |
Output LOW Voltage |
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OL |
VIN = VIL or VIH |
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0.35 |
0.5 |
V |
IOL = 24 mA |
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per Truth Table |
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IOZH |
Output Off Current HIGH |
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20 |
μA |
VCC = MAX, VOUT = 2.7 V |
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IOZL |
Output Off Current LOW |
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± 200 |
μA |
VCC = MAX, VOUT = 0.4 V |
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A or B, DR or |
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20 |
μA |
VCC = MAX, VIN = 2.7 V |
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E |
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IIH |
Input HIGH Current |
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DR or E |
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0.1 |
mA |
VCC = MAX, VIN = 7.0 V |
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A or B |
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0.1 |
mA |
VCC = MAX, VIN = 5.5 V |
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IIL |
Input LOW Current |
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± 0.2 |
mA |
VCC = MAX, VIN = 0.4 V |
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IOS |
Output Short Circuit Current (Note 1) |
± 40 |
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± 225 |
mA |
VCC = MAX |
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Power Supply Current |
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Total, Output HIGH |
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70 |
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ICC |
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mA |
VCC = MAX |
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Total, Output LOW |
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90 |
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Total at HIGH Z |
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95 |
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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)
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Limits |
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Symbol |
Parameter |
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Unit |
Test Conditions |
Min |
Typ |
Max |
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tPLH |
Propagation Delay, Data to Output |
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8.0 |
12 |
ns |
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tPHL |
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8.0 |
12 |
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CL = 45 pF, |
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tPZH |
Output Enable Time to HIGH Level |
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25 |
40 |
ns |
RL = 667 Ω |
tPZL |
Output Enable Time to LOW Level |
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27 |
40 |
ns |
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tPLZ |
Output Disable Time from LOW Level |
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15 |
25 |
ns |
CL = 5.0 pF, |
tPHZ |
Output Disable Time from HIGH Level |
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15 |
25 |
ns |
RL = 667 Ω |
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