SN74LS279N [MOTOROLA]
QUAD SET-RESET LATCH; QUAD SET -复位锁存器
| 型号： | SN74LS279N |
| 厂家： | 
MOTOROLA |
| 描述： | QUAD SET-RESET LATCH |
| 文件： | 总4页 (文件大小：133K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS279
QUAD SET-RESET LATCH
QUAD SET-RESET LATCH
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
16
TRUTH TABLE
1
INPUT
OUTPUT
(Q)
S
S
R
1
2
N SUFFIX
PLASTIC
CASE 648-08
L
L
X
L
H
H
L
H
H
L
h
H
H
L
L
X
H
H
16
1
H
No Change
L = LOW Voltage Level
H = HIGH Voltage Level
X = Don’t Care
D SUFFIX
SOIC
CASE 751B-03
16
h = The output is HIGH as long as
h = S or S is LOW. If all inputs go
1
1
2
h = HIGH simultaneously, the output
h = state is indeterminate; otherwise,
h = it follows the Truth Table
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
I
I
Output Current — High
Output Current — Low
54, 74
–0.4
mA
mA
OH
54
74
4.0
8.0
OL
FAST AND LS TTL DATA
5-452
SN54/74LS279
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.5
2.7
= MIN, I
OH
= MAX, V = V
IN
CC
IH
OH
or V per Truth Table
IL
3.5
V
V
= V
CC
MIN,
= V or V
IL IH
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
I
= 4.0 mA
= 8.0 mA
CC
IN
OL
V
Output LOW Voltage
Input HIGH Current
OL
per Truth Table
OL
20
0.1
µA
mA
mA
mA
mA
V
V
V
V
V
= MAX, V = 2.7 V
IN
CC
CC
CC
CC
CC
I
IH
= MAX, V = 7.0 V
IN
I
I
I
Input LOW Current
–0.4
–100
7.0
= MAX, V = 0.4 V
IN
IL
Short Circuit Current (Note 1)
Power Supply Current
–20
= MAX
= MAX
OS
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C)
A
Limits
Typ
Symbol
Parameter
Unit
ns
Test Conditions
Min
Max
t
t
22
*21*
PLH
PHL
Propagation Delay, S to Output
V = 5.0 V
CC
= 15 pF
C
L
t
Propagation Delay, R to Output
27
ns
PHL
* Add 0.6 ns to spec limit for each 1.0 ns input rise time less than 15 ns.
FAST AND LS TTL DATA
5-453
Case 751B-03 D Suffix
16-Pin Plastic
SO-16
-A-
16
1
9
8
P
C
-B-
R X 45°
G
-T-
J
M
F
D
°
°
°
°
K
Case 648-08 N Suffix
16-Pin Plastic
-A-
16
1
9
B
S
8
F
L
C
K
-T-
M
H
J
G
D
°
°
°
°
Case 620-09 J Suffix
16-Pin Ceramic Dual In-Line
-A-
16
9
-B-
1
8
L
C
-T-
K
M
N
E
J
F
G
D
°
°
°
°
FAST AND LS TTL DATA
5-454
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