2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
Wide Supply Voltage Range: 4.5V To 16V
100 mA Output Current Per Section
Edge Triggered Without Coupling Capacitor
Time Period Equals RC
Output independent Of Trigger Conditions
Applications
Quad One-Shot
Sequential Timing
Precision Timing
Time Delay Generation
Description
The NE558 series are monolithic Quad Timers which can
be used to produce four entirely independent timing func-
tions. These highly stable, general purpose controllers can be
used in a monostable mode to produce accurate time delays,
from microseconds to hours. The time is precisely con-
trolled by one external resistor and one capacitor in the time
delay mode. A stable mode can be operated using two of
four time sections.
16-DIP
16-SOP
1
1
Internal Block Diagram
NE558
Quad Timer
NE558
2
Absolute Maximum Ratings (T
A
= 25
C)
Electrical Characteristics
(V
CC
= 5 ~ 15V, T
A
= 25
C, unless otherwise specified)
Note :
1. The trigger functions only on the falling edge of the trigger pulse only after previously being high. After reset the trigger must
be brought high and then low to implement triggering.
2. For reset below 0.8V, outputs set low and trigger inhibited.
3. Output structure is open collector which requires a pull up resistor to V
CC
to sink current.
The output is normally low sinking current.
Parameter
Symbol
Value
Unit
Supply Voltage
V
CC
16
V
Lead Temperature (soldering 10sec)
T
LEAD
300
C
Power Dissipation
P
D
600
mW
Operating Temperature Range NE558
T
OPR
0 ~ + 70
C
Storage Temperature Range
T
STG
-65 ~ + 150
C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply Voltage
V
CC
-
4.5
-
16
V
Supply Current
I
CC
V
CC
=15V, reset voltage =15V
-
16
36
mA
Timing Error (T = RC)
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
ACCUR
t/
T
t/
V
CC
R = 2K
to 100K
, C =1
F
-
2
30
0.1
5
150
0.9
%
PPM/
C
%/V
*
1
Trigger Voltage
V
TR
V
CC
= 15V
-
1.5
2.4
V
*
1
Trigger Current
I
TR
V
TR
= 0V
-
5.0
100
A
*
2
Reset Voltage
V
RST
-
0.8
1.5
2.4
V
*
2
Reset Current
I
RST
-
-
50
500
A
Threshold Voltage
V
TH
-
0.8
0.63
V
CC
-
V
Threshold Current
I
TH
-
-
15
-
nA
*3
Output Voltage
V
O
I
L
= 10mA
-
0.1
0.4
V
I
L
= 100mA
-
1.0
2.0
Output Leakage Current
I
LKG
-
-
10
500
nA
Propagation Delay Time
t
D
-
-
1.0
-
S
Rise Time
t
R
I
L
= 100mA
-
100
-
nS
Fall Time
t
F
I
L
= 100mA
-
100
-
nS
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