MOTOROLA SN74LS645H, SN74LS645N, SN74LS640DW, SN74LS640DWR2, SN74LS640H Datasheet
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SN74LS640 SN74LS641 SN74LS642 SN74LS645
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 transmission 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 |
OUTPUT |
LOGIC |
LS640 |
3-State |
Inverting |
LS641 |
Open-Collector |
True |
LS642 |
Open-Collector |
Inverting |
LS645 |
3-State |
True |
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LOW
POWER
SCHOTTKY
FUNCTION TABLE
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CONTROL |
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OPERATION |
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INPUTS |
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LS640 |
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LS641 |
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DIR |
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LS642 |
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LS645 |
G |
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L |
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L |
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data to A bus |
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B data to A bus |
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B |
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L |
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H |
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data to B bus |
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A data to B bus |
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A |
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H |
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X |
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Isolation |
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Isolation |
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H = HIGH Level, L = LOW Level, X = Irrelevant
GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645)
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 |
GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642) |
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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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VOH |
Output Voltage ± High |
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5.5 |
V |
IOL |
Output Current ± Low |
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24 |
mA |
20 
1
PLASTIC
N SUFFIX
CASE 738
20
1
SOIC
DW SUFFIX
CASE 751D
ORDERING INFORMATION
Device |
Package |
Shipping |
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SN74LS640N |
16 Pin DIP |
1440 Units/Box |
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SN74LS640DW |
16 Pin |
2500/Tape & Reel |
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SN74LS641N |
16 Pin DIP |
1440 Units/Box |
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SN74LS641DW |
16 Pin |
2500/Tape & Reel |
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SN74LS642N |
16 Pin DIP |
1440 Units/Box |
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SN74LS642DW |
16 Pin |
2500/Tape & Reel |
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SN74LS645N |
16 Pin DIP |
1440 Units/Box |
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SN74LS645DW |
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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SN74LS640/D |
SN74LS640 SN74LS641 SN74LS642 SN74LS645
CONNECTION DIAGRAMS DIP (TOP VIEW)
ENABLE |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
B8 |
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VCC |
G |
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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 |
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SN74LS640 |
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SN74LS642 |
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VCC |
ENABLE |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
B8 |
G |
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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 |
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SN74LS641 |
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SN74LS645 |
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2
SN74LS640 SN74LS641 SN74LS642 SN74LS645
SN74LS640 •SN74LS645
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
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Limits |
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Symbol |
Parameter |
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Unit |
Test Conditions |
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Min |
Typ |
Max |
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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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0.6 |
V |
Guaranteed Input LOW Voltage for |
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All Inputs |
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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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± 400 |
μA |
VCC = MAX, VOUT = 0.4 V |
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A or B, DIR or |
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20 |
μA |
VCC = MAX, VIN = 2.7 V |
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G |
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IIH |
Input HIGH Current |
DIR or |
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0.1 |
mA |
VCC = MAX, VIN = 7.0 V |
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G |
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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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± 0.4 |
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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ICC |
Total Output HIGH |
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70 |
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)
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Limits |
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LS640 |
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LS645 |
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Symbol |
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Parameter |
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Unit |
Test Conditions |
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Min |
Typ |
Max |
Min |
Typ |
Max |
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tPLH |
Propagation Delay |
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6.0 |
10 |
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8.0 |
15 |
ns |
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tPHL |
A to B |
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8.0 |
15 |
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11 |
15 |
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tPLH |
Propagation Delay |
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6.0 |
10 |
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8.0 |
15 |
ns |
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tPHL |
B to A |
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8.0 |
15 |
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11 |
15 |
CL = 45 pF, |
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t |
Output Enable Time |
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31 |
40 |
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31 |
40 |
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RL = 667 Ω |
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PZL |
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ns |
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tPZH |
G, DIR to A |
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23 |
40 |
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26 |
40 |
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tPZL |
Output Enable Time |
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31 |
40 |
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31 |
40 |
ns |
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tPZH |
G, DIR to B |
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23 |
40 |
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26 |
40 |
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tPLZ |
Output Disable Time |
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15 |
25 |
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15 |
25 |
ns |
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tPHZ |
G, DIR to A |
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15 |
25 |
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15 |
25 |
CL = 5.0 pF |
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tPLZ |
Output Disable Time |
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15 |
25 |
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15 |
25 |
ns |
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tPHZ |
G, DIR to B |
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15 |
25 |
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15 |
25 |
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