LMC555
CMOS general purpose timer
The LMC555 is CMOS RC timers providing significantly improved
performance over the standard SE/NE555 and 355 timers, while at
the same time being direct replacements for those devices in most
applications. Improved parameters include low supply current, wide
operating supply voltage range, low THRESHOLD, TRIGGER and
RESET currents, no crowbarring of the supply current during output
transitions, higher frequency performance and no requirement to
decouple CONTROL VOLTAGE for stable operation.
Specifically, the LMC555 is stable controller capable of producing
accurate time delays of frequencies.
N SUFFIX
PLASTIC
8
1
•
•
•
•
•
•
•
•
Exact equivalent in most cases for SE/NE555.
Low Supply Current.
High speed operation – 500 kHz guaranteed.
Wide operation supply voltage range – 2 to 18 volts.
Timing from microseconds through hours.
Operates in both astable and monostable modes.
Adjustable duty cycle.
High output source/sink driver can drive TTL/CMOS
ORDERING INFORMATION
ILC555N Plastic
IZC555 Chip
T
A
= -20° to 70° C for
the package
PIN ASSIGNMENT
GND
TRIGGER
OUTPUT
RESET
01
02
08
V
CC
07 DISCHARGE
LMC555
03
04
06 THRESHOLD
05
CONTROL
VOLTAGE
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2018 JUN
LMC555
TRUTH TABLE
THRESHOLD
X
> 2/3⋅V
CC
< 2/3⋅V
CC
X
TRIGGER
X
> 1/3⋅V
CC
> 1/3⋅V
CC
< 1/3⋅V
CC
RESET
L
H
H
H
OUTPUT
L
L
STABLE
H
DISCHARGE
ON
ON
STABLE
OFF
MAXIMUM RATINGS AND RECOMMENDED OPERATING CONDITIONS
Parameter, unit
Symbol
Recommended operating
conditions
Value
min
Supply Voltage, V
Output Current, mА
Input Voltage, V
V
CC
I
O
V
TH,
V
TRIG,
V
RST
P
D
T
OPR
T
STG
T
SOLDER
2.0
-
-
max
18.0
20
-
min
0
-
-0.3
Maximum ratings
Value
max
18.0
100
V
CC
+0.3
200
85
150
260
Power Dissipation, mW
Operating Temperature,°С
Storage Temperature,
°С
Lead Temperature, 1 mm from
Case for 10 Seconds,
°С
-
-20
-
-
-
70
-
-
-
-20
-65
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2018 JUN
LMC555
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Parameter, units
Threshold Voltage, V
Symbol
V
TH
Test Conditions
I
OL
, I
OH
V
CC,
В
5.0
min
0.65 V
CC
0.60 V
CC
Trigger voltage, V
V
TRIG
5.0
0.31 V
CC
0.28 V
CC
2.0
Reset voltage, V
V
RST
18.0
2.0
18.0
Control Voltage Lead, V
V
CV
0.65 V
CC
0.60 V
CC
Output voltage Low, V
V
OL
I
OL
= 3.2 mА
I
OL
= 20 mА
I
OL
= 3.2 mА
I
OL
= 20 mА
Output voltage High, V
V
OH
I
OH
= -0.8 mА
5.0
15.0
5.0
15.0
5.0
15.0
5.0
15.0
2.0
Supply Current,
μA
I
CC
18.0
2.0
18.0
4.0
14.3
3.5
14.0
200
300
400
600
-20, 70
25±10
-20, 70
0.69 V
CC
0.80 V
CC
0.4
1.0
0.6
1.5
25±10
-20, 70
25±10
-20, 70
25±10
0.2
1.5
-20, 70
0.4
Value
max
0.70 V
CC
0.80 V
CC
0.36 V
CC
0.40 V
CC
1.0
Tempe-
rature, °С
25±10
-20, 70
25±10
-20, 70
25±10
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2018 JUN
LMC555
AC ELECTRICAL CHARACTERISTICS
Parameter, unit
Rise (Fall) Time of Output,
ns
Guaranteed Max Osc Freq,
kHz
Initial accuracy
, %
Drift with Temperature
,
Symbol
Test Conditions
R
L
, C
L
V
CC,
V
Min
Value
Max
Tempe-
rature,
°С
t
THL
, t
TLH
R
L
= 10
МΩ,
C
L
= 10 pF
f
MAX
Astable Operation
5.0
35
70
500
200
5
75
150
25±10
-20, 70
25±10
-20, 70
2.0-
18.0
5.0
%/°С
αf
R
L
= 1 - 100 kΩ,
C
L
= 0.1
μF
Δf
0.02
0.03
0.06
3
6
-20, 70
Drift with Supply Voltage,
%/В
10.0
15.0
5.0
25±10
-20, 70
COMPARATOR A
TRIGGER
THRESHOLD
COMPARATOR B
Figura 1. Block Diagram
V
CC
0.9
TRIGGER
t
HL
0.9
OUTPUT
0.1
t
TLH
t
THL
0.1
GND
0.1
GND
V
CC
0.9
Figura 2. Switcing Waveforms
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2018 JUN
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