SN54/74LS279 QUAD SET-RESET LATCH
VCC 16
S1 15
R
Q
14
13
S1 12
S2 11
R 10
Q 9
QUAD SET-RESET LATCH LOW POWER SCHOTTKY
1 R
2 S1
3 S2
4 Q
5 R
6 S1
7 Q
8 GND
J SUFFIX CERAMIC CASE 620-09 16
TRUTH TABLE INPUT
1
S1
S2
R
OUTPUT (Q)
L L X H H
L X L H H
L H H L H
h H H L No Change
N SUFFIX PLASTIC CASE 648-08
16 1
L = LOW Voltage Level H = HIGH Voltage Level X = Don’t Care h = The output is HIGH as long as h = S1 or S2 is LOW. If all inputs go h = HIGH simultaneously, the output h = state is indeterminate; otherwise, h = it follows the Truth Table
16 1
D SUFFIX SOIC CASE 751B-03
ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD
Ceramic Plastic SOIC
GUARANTEED OPERATING RANGES Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54 74
4.5 4.75
5.0 5.0
5.5 5.25
V
TA
Operating Ambient Temperature Range
54 74
– 55 0
25 25
125 70
°C
IOH
Output Current — High
54, 74
– 0.4
mA
IOL
Output Current — Low
54 74
4.0 8.0
mA
FAST AND LS TTL DATA 5-1