74LS68 PDF даташит
Спецификация 74LS68 изготовлена «Motorola Semiconductors» и имеет функцию, называемую «8-BIT MAGNITUDE COMPARATORS». |
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Детали детали
Номер произв | 74LS68 |
Описание | 8-BIT MAGNITUDE COMPARATORS |
Производители | Motorola Semiconductors |
логотип |
6 Pages
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8-BIT MAGNITUDE
COMPARATORS
The SN54 / 74LS682, 684, 688 are 8-bit magnitude comparators. These
device types are designed to perform comparisons between two eight-bit
binary or BCD words. All device types provide P = Q outputs and the LS682
and LS684 have P>Q outputs also.
The LS682, LS684 and LS688 are totem pole devices. The LS682 has a
20 kΩ pullup resistor on the Q inputs for analog or switch data.
CONNECTION DIAGRAMS (TOP VIEW)
VCC P=Q Q7 P7 Q6 P6 Q5 P5 Q4 P4
20 19 18 17 16 15 14 13 12 11
SN54/74LS682/684
1 2 3 4 5 6 7 8 9 10
P>Q P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND
VCC P=Q Q7 P7 Q6 P6 Q5 P5 Q4 P4
20 19 18 17 16 15 14 13 12 11
SN54/74LS682
SN54/74LS684
SN54/74LS688
8-BIT MAGNITUDE
COMPARATORS
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
SN54/74LS688
1 2 3 4 5 6 7 8 9 10
G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND
TYPE
LS682
LS684
LS688
P=Q
yes
yes
yes
P>Q
yes
yes
no
OUTPUT
ENABLE
no
no
yes
OUTPUT
CONFIGURATION
totem-pole
totem-pole
totem-pole
PULLUP
yes
no
no
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
FUNCTION TABLE
INPUTS
OUTPUTS
DATA
ENABLES
P, Q G, GT G2 P = Q P > Q
P=Q L L L H
P>Q L L H L
P<Q L L H H
X H HHH
H = HIGH Level, L = LOW Level, X = Irrelevant
FAST AND LS TTL DATA
5-603
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SN54/74LS682 • SN54/74LS684 • SN54/74LS688
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
–0.4 mA
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
Guaranteed Input HIGH Voltage for
V All Inputs
VIL Input LOW Voltage
54
74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
– 0.65 – 1.5
2.5 3.5
2.7 3.5
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
IIH
IIL
Output LOW Voltage
54, 74
74
Input HIGH Current
Input LOW Current
LS628-Q Inputs
Others
LS682-Q Inputs
Others
0.25 0.4
0.35 0.5
20
0.1
0.1
– 0.4
– 0.2
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 5.5 V
mA VCC = MAX, VIN = 7.0 V
mA
VCC = MAX, VIN = 0.4 V
mA
IOS Short Circuit Current (Note 1) – 30 – 130
LS682
Power Supply
ICC Current
LS684
LS688
70
65
65
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
mA
mA VCC = MAX
mA
FAST AND LS TTL DATA
5-604
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(17)
P7
(18)
Q7
(15)
P6
(16)
Q6
(13)
P5
(14)
Q5
(11)
P4
(12)
Q4
P3
Q3
(8)
(9)
P2
Q2
(6)
(7)
P1
Q1
(4)
(5)
P0
Q0
(2)
(3)
SN54/74LS682 • SN54/74LS684 • SN54/74LS688
LOGIC DIAGRAMS
P7
(19)
P=Q
Q7
P6
Q6
P5
Q5
P4
Q4
P3
Q3
P2
Q2
P1
(1)
P>Q
Q1
P0
Q0
(17)
(18)
(15)
(16)
(13)
(14)
(11)
(12)
(8)
(9)
(6)
(7)
(4)
(5)
(2)
(3)
SN54 / 74LS682 thru LS684
(1)
G
SN54 / 74LS688
(19)
P=Q
FAST AND LS TTL DATA
5-605
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