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74LS279 PDF даташит

Спецификация 74LS279 изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «Quad S-R Latch».

Детали детали

Номер произв 74LS279
Описание Quad S-R Latch
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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74LS279 Даташит, Описание, Даташиты
August 1986
Revised March 2000
DM74LS279
Quad S-R Latch
General Description
The DM74LS279 consists of four individual and indepen-
dent Set-Reset Latches with active low inputs. Two of the
four latches have an additional S input ANDed with the pri-
mary S input. A LOW on any S input while the R input is
HIGH will be stored in the latch and appear on the corre-
sponding Q output as a HIGH. A LOW on the R input while
the S input is HIGH will clear the Q output to a LOW. Simul-
taneous transition of the R and S inputs from LOW-to-
HIGH will cause the Q output to be indeterminate. Both
inputs are voltage level triggered and are not affected by
transition time of the input data.
Ordering Code:
Order Number Package Number
Package Description
DM74LS279M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS279N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
Output
S (Note 1)
R
Q
L L H (Note 2)
L HH
HLL
H H Q0
H = HIGH Level
L = LOW Level
Q0 = The Level of Q before the indicated input conditions were established.
Note 1: For latches with double S inputs:
H = both S inputs HIGH
L = one or both S inputs LOW
Note 2: This output level is pseudo stable; that is, it may not persist when
the S and R inputs return to their inactive (HIGH) level.
© 2000 Fairchild Semiconductor Corporation DS006420
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74LS279 Даташит, Описание, Даташиты
Absolute Maximum Ratings(Note 3)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 3: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
Min
4.75
2
0
Nom
5
Max
5.25
0.8
0.4
8
70
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI Input Clamp Voltage
VOH HIGH Level
Output Voltage
VOL LOW Level
Output Voltage
II Input Current @ Max Input Voltage
IIH HIGH Level Input Current
IIL LOW Level Input Current
IOS Short Circuit Output Current
ICC Supply Current
Note 4: All typicals are at VCC = 5V, TA = 25°C.
VCC = Min, II = −18 mA
VCC = Min, IOH = Max
VIL = Max, VIH = Min
VCC = Min, IOL = Max
VIL = Max, VIH = Min
IOL = 4 mA, VCC = Min
VCC = Max, VI = 7V
VCC = Max, VI = 2.7V
VCC = Max, VI = 0.4V
VCC = Max (Note 5)
VCC = Max (Note 6)
2.7
20
Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 6: ICC is measured with all R inputs grounded, all S inputs at 4.5V and all outputs OPEN.
Typ
(Note 4)
3.5
0.35
0.25
3.8
Max
1.5
0.5
0.4
0.1
20
0.4
100
7
Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
tPLH Propagation Delay Time
LOW-to-HIGH Level Output
tPHL Propagation Delay Time
HIGH-to-LOW Level Output
tPHL Propagation Delay Time
HIGH-to-LOW Level Output
From (Input)
To (Output)
S to Q
S to Q
R to Q
RL = 2 k
CL = 15 pF
CL = 50 pF
Min Max Min Max
22 25
15 23
27 33
Units
V
V
V
mA
mA
°C
Units
V
V
V
mA
µA
mA
mA
mA
Units
ns
ns
ns
www.fairchildsemi.com
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74LS279 Даташит, Описание, Даташиты
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
3 www.fairchildsemi.com










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