74ls640_641_642_645_bus-transceiver-8bits
TRANSCRIPT
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CONNECTION DIAGRAMS DIP (TOP VIEW)
18 17 16 15 14 13
1 2 3 4 5 6 7
20 19
8
VCC
DIR
B1 B2 B3 B5B4 B6
A1 A2 A3 A4 A5 A6 A79 10
A8 GND
12 11B7 B8
18 17 16 15 14 13
1 2 3 4 5 6 7
20 19
8
VCC
DIR
B1 B2 B3 B5B4 B6
A1 A2 A3 A4 A5 A6 A79 10
A8 GND
12 11B7 B8
SN54/74LS640SN54/74LS642
SN54/74LS641SN54/74LS645
ENABLEG
ENABLEG
5-1FAST AND LS TTL DATA
OCTAL BUS TRANSCEIVERSThese octal bus transceivers are designed for asynchronous two-way
communication between data buses. Control function implementationminimizes 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 logiclevel of the direction control (DIR) input. Enable input (G) can disable thedevice so that the buses are effectively isolated.
DEVICE OUTPUT LOGICLS640 3-State InvertingLS641 Open-Collector TrueLS642 Open-Collector InvertingLS645 3-State True
FUNCTION TABLECONTROL
INPUTSOPERATION
INPUTSLS640 LS641
G DIRLS640LS642
LS641LS645
L L B data to A bus B data to A bus
L H A data to B bus A data to B bus
H X Isolation Isolation
H = HIGH Level, L = LOW Level, X = Irrelevant
SN54/74LS640SN54/74LS641SN54/74LS642SN54/74LS645
OCTAL BUS TRANSCEIVERS
LOW POWER SCHOTTKY
ORDERING INFORMATIONSN54LSXXXJ CeramicSN74LSXXXN PlasticSN74LSXXXDW SOIC
201
J SUFFIXCERAMIC
CASE 732-03
201
N SUFFIXPLASTIC
CASE 738-03
201
DW SUFFIXSOIC
CASE 751D-03
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5-2FAST AND LS TTL DATA
SN54/74LS640 SN54/74LS645
GUARANTEED OPERATING RANGESSymbol Parameter Min Typ Max Unit
VCC Supply Voltage 5474
4.54.75
5.05.0
5.55.25
V
TA Operating Ambient Temperature Range 5474
550
2525
12570
C
IOH Output Current High 54, 74 3.0 mAOH p g5474
1215
mA
IOL Output Current Low 5474
1224
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
S b l PLimits
U i T C di iSymbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 VGuaranteed Input HIGH Voltage forAll Inputs
VIL Input LOW Voltage54 0.5
V Guaranteed Input LOW Voltage forVIL Input LOW Voltage 74 0.6V Guaranteed Input LOW Voltage forAll Inputs
VIK Input Clamp Diode Voltage 0.65 1.5 V VCC = MIN, IIN = 18 mA
VOH Output HIGH Voltage54, 74 2.4 3.4 V VCC = MIN, IOH = 3.0 mAVOH Output HIGH Voltage 54, 74 2.0 V VCC = MIN, IOH = MAX
VOL Output LOW Voltage54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN,
VIN = VIL or VIHVOL Output LOW Voltage74 0.35 0.5 V IOL = 24 mA
VIN = VIL or VIHper Truth Table
IOZH Output Off Current HIGH 20 A VCC = MAX, VOUT = 2.7 VIOZL Output Off Current LOW 400 A VCC = MAX, VOUT = 0.4 V
I I HIGH CA or B, DIR or G 20 A VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current DIR or G 0.1 mA VCC = MAX, VIN = 7.0 VIH pA or B 0.1 mA VCC = MAX, VIN = 5.5 V
IIL Input LOW Current 0.4 mA VCC = MAX, VIN = 0.4 VIOS Output Short Circuit Current (Note 1) 40 225 mA VCC = MAX
I
Power Supply CurrentTotal Output HIGH 70
mA V MAXICC Total, Output LOW 90 mA VCC = MAX
Total at HIGH Z 95Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V)
S b l P
Limits
U i T C di iS b l PLS640 LS645
U i T C di iSymbol Parameter Min Typ Max Min Typ Max Unit Test ConditionstPLHtPHL
Propagation DelayA to B
6.08.0
1015
8.011
1515 ns
C 45 FtPLHtPHL
Propagation DelayB to A
6.08.0
1015
8.011
1515 ns CL = 45 pF,
tPZLtPZH
Output Enable TimeG, DIR to A
3123
4040
3126
4040 ns
CL 45 pF,RL = 667
tPZLtPZH
Output Enable TimeG, DIR to B
3123
4040
3126
4040 ns
tPLZtPHZ
Output Disable TimeG, DIR to A
1515
2525
1515
2525 ns
CL = 5 0 pFtPLZtPHZ
Output Disable TimeG, DIR to B
1515
2525
1515
2525 ns
CL = 5.0 pF
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5-3FAST AND LS TTL DATA
SN54/74LS641 SN54/74LS642
GUARANTEED OPERATING RANGESSymbol Parameter Min Typ Max Unit
VCC Supply Voltage 5474
4.54.75
5.05.0
5.55.25
V
TA Operating Ambient Temperature Range 5474
550
2525
12570
C
VOH Output Current High 54, 74 5.5 V
IOL Output Current Low 5474
1224
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
S b l P
Limits
U i T C di iSymbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 VGuaranteed Input HIGH Voltage forAll Inputs
VIL Input LOW Voltage54 0.5
VGuaranteed Input LOW Voltage for
VIL Input LOW Voltage 74 0.6V
p gAll Inputs
VIK Input Clamp Diode Voltage 0.65 1.5 V VCC = MIN, IIN = 18 mA
IOH Output HIGH Current 54, 74 100 A VCC = MIN, VOH = MAX
VOL Output LOW Voltage54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN,
VIN = VIL or VIHVOL Output LOW Voltage74 0.35 0.5 V IOL = 24 mA
VIN = VIL or VIHper Truth Table
IIH Input HIGH Current20 A VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current 0.4 mA VCC = MAX, VIN = 0.4 V
I
Power Supply CurrentTotal, Output HIGH 70
mA V MAXICC Total, Output LOW 90 mA VCC = MAX
Total at HIGH Z 95
AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V)
S b l P
Limits
U i T C di iS b l PLS641 LS642
U i T C di iSymbol Parameter Min Typ Max Min Typ Max Unit Test Conditions
tPLHtPHL
Propagation Delay,A to B
1716
2525
1914
2525 ns
C 45 FtPLHtPHL
Propagation Delay,B to A
1716
2525
1914
2525 ns CL = 45 pF,
tPLHtPHL
Propagation Delay,G, DIR to A
2334
4050
2643
4060 ns
L p ,RL = 667
tPLHtPHL
Propagation Delay,G, DIR to B
2537
4050
2839
4060 ns
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