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MC1455
MC1555
Specifications
and Applications
Information
I
4
TIMING CIRCUIT
The MC1555/MC1455
monolithic timing circuit is a highly stable
controller capable of producing accurate time delays, or oscillation. Additional terminals are provided for triggering or resetting
if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and the
duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on
falling waveforms, and the output structure can source or sink up
to 200 mA or drive MTTL circuits.
●
Direct Replacement
for NE555/SE555
●
Timing
●
operates
●
Adjustable
●
High Current Output Can Source or Sink 200 mA
●
output
From Microseconds
Through
~,.y!
,7*2>a
*Y$
,.,.,*$~\.,
*tl~i;.
~.i,;.,x..$.*:.
$:?, .
‘s. .>,.
‘, i\..
‘..,,
.Meiti:l’
‘?>,
~,?,~y:.x$:+
,,.}:+*:,,
!$.!l
,t.
Timers
Hours
in Both Astable and Monostable
Modes
Duty Cycle
Can Drive MTTL
METAL PACKAGE
CASE 601-04
1.
2.
3.
4.
Ground
Trigger
output
Reset
5.
6.
7.
8.
Control Voltage
Threshold
Discharge
Vcc
8
n
5
4
1
(Top
View)
PI SUFFIX
PLASTIC PACKAGE
CASE 626-04
(MC1455P1 only)
U SUFFIX
CERAMIC PACKAGE
CASE 693-02
F*
Ik
~
V
1
D SUFFIX
PLASTIC PACKAGE
f.!
~>~~
CASE
Vcc
ORDERING
7
5
_A
Flip
Oischarge
Device
2
s Inhibiti
Reset
_B
5k
7
Gn~
MTTL is a trademark
J
1
of Motorola
Inc.
1‘4
Reset
output
INFORMATION
Temperature
R FIOP
Alternate
5k
Trigger
,*
*
5k
Threshold
Control
Voltage
s
SO-8
~8
~
751-01
MCI 455G
—
MC1455P1
NE555V
MC1455D
—
Mcl 455U
—
MC1455BPI
O“c to
—
MCI 555U
SE555
INC., 1985
Package
+70”C
+ 70”C
Metal Can
Plastic DIP
O“c to + 70°c
SO-8
O“c to + 70°c
Ceramic DIP
– 400C tO
MC1555G
@MOTOROLA
Range
O“cto
+
a5”c
Plastic DIP
– 55°C to + 125°C Metal Can
– 55°C to + 125°C Ceramic
OIP
DS9240R3
MAXIMUM RATINGS (TA = + 2YC unless otherwise noted.)
Rating
Power Supply Voltage
Discharge
Current (Pin 7)
] Symbol]
Value
Unit
v~~
+18
Vdc
200
mA
17
Power Dissipation (Package
Umitation)
Metal Can
Derate above TA = + 2YC
Plastic Dual In-Line Package
Derate above TA = + 29C
Operating Temperature
Range (Ambient)
MC1555
MC1455B
MC1455
Storage Temperature
FIGURE 3 — GENERAL TEST CIRCUIT
v~~
-’cc
—
Vcc
5
mW
mWPC
mW
m W/°C
680
4.6
625
5.0
0.01
WF
Range
65to
6 Threshold
n
output
‘th
l~i”~
l~o”rce
2
—
==
‘c
+150
=
Typ
—
4.5
SUPPIV Voltage
Max
16
Current
VCC=
5.OV,
Low State,
Error
RL=W
12
(Note
v
—
—
3.0
10
1.0
50
0.10
6.0
15
1)
(Note
2)
R=l.Ok~to100k~
Initial Accuracy
Drift
with Temperature
100
Drift
with Suo~lv
0.20
—
—
—
—
—
2/3
5.0
1.67
—
—
—
—
0.5
—
—
1.0
0.4
0.7
1.0
—
—
—
0.1
—
Threshold
Unit
mA
VCC=15V,RL=~
Timing
7
Oischarge
Charatieristics
Supplv
,—
=
MC1 555
MC1455
i,
55to
+125
40 to + 85
Oto +70
ELECTRICALCHARACTERISTICS (TA
Control
Voltage
“c
TA
II
700 11
2.0
C = 0,1 pF
Voltaae
Voltage
“/0
PPMl°C
—
—
Yolvolt
Xvcc
v
Trigger Voltage
v~~=15v
5.2
1.9
IR
Ith
!di~
—
—
—
0.1
—
0.1
0.25
—
100
9.6
10
10.4
2.9
3.33
3.8
—
0.1
—
—
—
0.4
2.0
2.5
0.15
0.5
2.2
—
—
—
—
—
—
—
0.1
—
0.25
—
—
—
PA
v
mA\l
0.1
—
0.25
PA
100
nA
9.0
10
11
2.6
3.33
4.0
0.1
0.25
0.75
2.5
VCL
v
VO L
v
vo H
‘(l~”~~e=200
mA)
VCC=15V
(l~Ource= 100mA)
Vcc= 15V
Vcc = 5.0 v
tOLH
Rise Time of OutDut
Fall Time
I —I
tOHL
of Output
0.4
2.0
2.5
—
—
—
0.25
0.35
v
—
12.5
13
3.0
—
13.3
3.3
—
100
—
—
—
—
100
—
12.5
13.3
3.3
12.75
2.75
100
—
100
—
—
—
—
—
ns
ns
OTES:
1. SupplV current
when output
is high is tvpimllv
1.0 mA less.
2. Tested at VCC = 5.0 V and VCC = 15 V.
Monostable
3. This will determine
The maximum
the maximum
value of RA + RB for 15 V operation.
total R = 20 megohms.
mode
MOTOROLA
Semiconductor
@
2
Products Inc.
.-
TYPICAL CHARACTERISTICS
(TA = + 2WC unless othewise
FIGURE 4 — TRIGGER PULSE WIDTH
FIGURE 5 — SUPPLY CURRENT
150
10
125
~
E
g 100
z
+
~ 75
u
m
;
~ 8.0
5
u
: 6.0
2
u
>
d 4.0
.
3
w
50
z-
noted.)
S2.O
25
o
5.0
0
0
0.2
0.1
0.3
0.4
VT(min), MI NIMUM TRIGGER VOLTAGE
(X VCC= Vdc)
@ Vec
Vcc,
10
SUPPLY VOLTAGE
15
(Vdc)
= 5.0 Vdc
VOLTAGE
@ VCC = 15 Vdc
10
10
~l,o
1.0
a
~
~
i
2
z
F
0.1
01
0.01
1,0
2.0
5.0
10
20
50
5.0
100
10
20
50
0.01
100
1.0
2.0
5.0
10
20
50
100
ISINK, (mA)
FIGURE 10 — DELA&TIM”~{yS
versus SUPPLY ~J~~QE
..,. “+!.K.
:,
1.015-
1.015
0
~
E
N 1.010
i
s
g
300
~
; 250
z
F
$ 200
d
u
n
~ 150
1.010
i
<
1.005
%
z
:
+
>
FIGURE 12 — PROPAGATION DELAY
versus TRIGGER VOLTAGE
FIGURE 11 — DEMY TIME
versus TEMPERATURE
1.005
0
z
1.000
~
; 0.995
0
>
0.990
\
-
1.000
F
>
5
w
0
0.995
~
0.990
.
\
-
r
<
: 100
L
0
~.
50
“.
0.985”
0.985
Vcc, SUPPLY VOLTAGE
(Vdc)
0
-75 -50 -25
TA, AMBIENT
MOTOROLA
+25
+50
+75 +1OO +125
TEMPERATURE
(OC)
Semiconductor
@
3
o
0
vT(~in),
0.4
0,3
0.2
0.1
MINIMUM TRIGGER VOLTAGE
(X VCC = Vdc)
Products Inc.
FIGURE 13 — REPRESENTATIVE
-—
t-–-
--
———
CIRCUIT SCHEMATIC
50
-
Control
Voltage
.—.
1
I
I
I
1
.
;
I
I
,1
I
‘hreshold
6
I
II
,1
II
:
-
3,9k
/
I
—
I
I
I
I
1
L______
Trigger
I
II
[1
10 k
I
I
I
II
1!
II
‘1
I
20
:
;E;
:T-
– -
11
II
I
I
lL__–
—
—___J
—
.—
The MC1555
is a monolithic
timing circuit which uses ~%$~
timing elements an external resistor – capacitor network,
‘~.,ca$Y
be used in both the monostable
(one-shot)
and ast~~fi~~-s
with frequency
and duty cycle controlled
by the G@~@it& and
A reset pin is provided to discharge the capacitor thus interrupting the timing cycle. As long as the reset pin i$ low, the capacitor discharge transistor is turned “on” and prevents the capacitor
from charging. While the reset voltaW is applied the digital output
will remain the same. The reset pin should be tied to the supply
voltage when not in usa.
resistor values.
While the timing is dependent u@t~~~l@~ternal
passive components,
the monolithic
circuit pra~~$~,:%a
startin9
circuit, voltage comparison and other function$t~’w~
for a comInternal
to the inte~atea~ c?rcuit are two
plete timing circuit.
mmperators,
one for the input signal an@fi$~k@$er
for capacitor
voltage; also a flip-flop and digital outp&t ar$ncluded.
The comparator reference voltages are alwa@’’&~~h@d ratio of the supply
voltage thus providing output
timin,~%de@ndent
,,i.,,,
$,\.\..,?>,,?”*$,
, :,.,,. .:&$,
~,,.
.*y.,<..$
,:.
~ ;“
FIGURE 14 — MONOSTABLE
,*.
Monostable
In the
Mode
monostabl~
,,:at:. ;:? \
. ..(~.$,
~d&J’~’capecitor
CIRCUIT
of supplv voltage.
+vc~
●
and a single resistor are
●
T
fRL
used for the timin~t#*k.
Both the threshold terminal and the
discharge transist:%~{~~inal
are connected to~ther
in this mode,
refer to circuit ‘~<~~
14. When the input voltaga to the trigger
comparator ~~a?ls,wow
1/3 VCC the mmperator
output triggers
the flip-f/~
:~Y:@at it’s output sets low. This turns the capacitor
dischar@ :~,~$lstor
“off” and drives the digital output to the high
statq.. ~~>’ condition
allows the capacitor to charge at an expon~~~.rate
which is set bv the R C time constant.
When the
RA
4
I
Discharge
I
3
7
b
*
output
2
I
.
‘,
<RL
.,’
-c
6
MC1555
Mc1455
mPa&$or volta9e reaches 2/3 VCC the threshold comparator resets
the flip-flop.
This action discharges the timing capacitor and returns the dgitel output to the low state. Once the flip-flop has
been triggered by an input signal, it cannot & retriggered until
the present timing pariod has been completed.
The time that the
output is high is given bv the equation t = 1.1 RA C. Various
combinations
of R and C and their associated times are shown in
Figure 16.
The triggar pulse width must be less than the timing
period.
MOTOROLA
(5 to 15 v)
T
<1
5 Threshold
~
=
Trigger
L
1
0.01
PF
T
Control
Voltage
——
Semiconductor
@
4
Products Inc.
GENERAL OPERATION
FIGURE 15 — MONOSTABLE
(continued)
WAVEFORMS
FIGURE 16 — TIME DELAY
t = 50 pslcrn
(RA=lokQ,
C= O.OltiF,
RL=
l.Ok~,
VCC=15V)
FIGURE 17 — ASTABLE CIRCUIT
+vcc(5t0
15 v)
I
T
1
I
‘.
:’RL
~,
I
I
Vcc
Reset
4
,
8
A
t = 20 ps/cm
(RA=5.1
k~,
RB=3.gk
In the astable mode the ti:~{,~~@&nnected
so Ihat it will
retrigger itself and cause the c~ac~@r voltage to oscillate between
1/3 VCC and 2/3 VCC.
S~~ F i9&~’~7.
C ‘0.01
vF, RL=
Q, VCC=
l.Ok~;
15 V)
..? ~;.~.
The external capacitq%@J,a$@s to 2/3 VCC through RA and RB
and discharges to l~$:,$~~through
RB. By varying the ratio of
these resistors th~,~~wtttycle
can be varied.
The charge and
discharge time~,ar~}~,~pendent
of the supply voltage.
The charge t~~>~$:t~ut
The discha~:
high) is given bv: tl = 0.695
ti$e’(output
Thus @:’’~$t$;:&riod
,*,,,.,,,
. ..,.,**)3,
... .
low) bv: t2 = 0.695
(RA+RB)
(RB)
is given bv: T = tl + t2 = 0.695
FIGURE 19 — FREE-RUNNING
C
C
(RA+2RB)
10
C
z~
u
be easilv found as shown in Figure 19.
RB
The duty cycle is given bv: DC = —
RA+2RB
G
:
\
0.1.
6
u
\
\
\
v-
To obtain the maximum
dutv cvcle RA must be as small as
possible; but it must also be large enough to limit the discharge
current (pin 7 current) within the maximum rating of the discharge
transistor (200 mA).
The minimum value of RA is given bv:
VCC (Vdc)
VCC (Vdc)
>
‘A >
17 (A)
0.2
MOTOROLA
\
a
+
and flav
m
FREQUENCY
100
0.01
\
\
\
10
\
100
\
l.Ok
(RA+2RB)
0.001
0.1
1,0
f, FREE-RUNNING
Semiconductor
5
FREQUENCY
Products Inc. ~
\
10 k
(Hz)
100k
I
APPLICATIONS
INFORMATION
Missing Pulse Detector
Linear Voltage Ramp
In the monostable
mode, the resistor can be replaced
The
bv a con-
37
1!-
\f --
then t can be made independent
timer
can be used to produce
an output
when @n input
pulse fails to occur within the delay of the timer. To,~@~$~lplish
this, set the time delav to be slightly longer than th:i~.~~t~e~een
successive input pulses. The timing cycle is then co~;m$~w%ly reset
by the input pulse train until a change in frequ~~y,~
a missing
pulse allows completion
of the timing cycle#~,&$~g
a change in
stant current source to provide a linear ramp voltage, The capacitor still charges from O to 2/3 Vcc.
The linear ramp time is given
by t=g
~cc
i!--
,—
of Vcc.
FIGURE 20 — LINEAR VOLTAGE SWEEP CIRCUIT
pvcc
“A
4
Discharge
7
4f
Threshold
6
MC1555
MC1455
I
Input
T
,-
Co”tro,
5 voltage
2
Trigger
xc
—
I
O.Ol&F
1
——
=
2N4403
~or’q”iv=
FIGURE 23 — MISSING
(RE = 10 k~, R2 = 100 $~,~1
=:’39 k~, C = 0.01 pF,VCC
t = 700
PULSE DETECTOR WAVEFORMS
(RA = 2.0 kQ, RL = 1.0 k~, C = 0.1 KF, VCC = 15 V)
t = 500
us/cm
MOTOROLA
@
= 15 V)
Semiconductor
6
pslcm
Products Inc.
APPLICATIONS
Pulse
Width
INFORMATION
(continued)
FIGURE 25 — PULSE WIDTH MODULATION
Modulation
WAVEFORMS
(RA = 10 kQ, C = 0.02 KF, VCC = 15 V)
the timer is triggered with a continuous
pulse train in the
monostable
mode of operation,
the charge time of the capacitor
mn be varied by changing the control voltage at pin 5. In this
manner, the output pulse width an be modulated
by applying
a modulating signal that controls the threshold voltage.
If
,*!*
FIGURE 24
+Vcc
(5t0
15 v)
c
●
Y
i )
BL
RA
8(
4C
3
7
●
o Utput
MC1555
6
MC7455
2
Ic
=
5
●
Input
,, ,,,.>,.. ,%
●
Modulation
Clock
Input
1
+
I
“i~,,W*Seq uences
‘\:\,*’?.l
,:J\:,\,
~,ix+,.,
~. Several timers can be connected to drive each other for sequen\....
“ tial timing.
An example is shown in Figure 26 where the sequence
~~
is started bv triggering the first timer which runs for 10 ms. The
output then switches low momentarily
and starts the second timer
Vcc
—
m
MOTOROLA
Semiconductor
7
Products Inc.
(5
to
15 v)
—
I
,
OUTLINE DIMENSIONS
—.
—’+
NOTE:
1.LEAOS WITHIN0.25mm (0.010)
OIAOF TRUE POSITIONAT
SEATINGPLANE AT M~lMUM
MATERIALCONOITION.
MILLIMETERS
DIM
A
JL.
MNE
MIN
INCHES
MU
8,51
MIN
Mti
9.40
0.335
0.370-
B
7.75
8.51
0.305
0.335
c
4.19
4.70
0.165
0.185
D
0.41
0.48
0.016
0,019
E
0.25
1,02
0.010
0.040
F
0.25
1,02
0.010
0.040
G
5.06BSC
H
0.71
0.86
0.028
0.034
J
0.74
1.14
0.029
0.045
K
12,70
–
0.500
L
3.05
4.06
0.120
M
N
45” BSC
2.41
0.040
O.om
0.200BSC
–
0.006
0,012
0.115
0.135
NOTES:
0.160
45”BSC
2.67
0.095
0,105
G SUFFIX
CASE 601-04
METAL PACWGE
(MC1455PI only)
3.PAC@E
CON~R
OPTIONAL[ROUNO OR
Sd~CORNERS).
,&_N@S
A ANO B ARE OATUMS,
‘$.Dl@SIONING ANO TOLERANCINGPER ANSI
PI SUFFIX
CASE 626-04
PLASTIC PACWGE
$~;~,+{~$~, 1982.
-.
{K
LAat
2.DIMENSION“Y TO CENTER OF LEAOS WHEN
FORMEO PARALLEL,
Motorola
reserves
not assume
patent
rights
Aff!rmatlve
any
the right
liability
nor the rights
Action
to make
ar!slng
changes
without
out of the application
of others
033-UL
CERAMIC
Motorola
and@
notice
or use of any
are registered
to any products
product
here!n
or circuit
trademarks
to improve
descr[bed
of Motorola,
reliability,
heretn,
Inc. Motorola,
neither
function
does
or design.
It convey
Inc. IS an Equal
Motorola
any license
Employment
does
under
Its
Opportunity/
Emolover
MOTOROLA
Semiconductor
@
BOX
8179-6
I +1 0.25(00101 @l A 81
PACWGE
further
D SUFFIX
PLASTIC PACWGE
CASE 751-01
SO-8
R6JA = 180°CW
NOTES:
1,.T-ISSEATINGPLANE.
2,DIMENSIONA ISOATUM.
3,POSITTONALTOLERANCE
FORLEAOS:
PBINIED
IN
“SA
7-85
m.,m
LIT”.
.32,17
1$,000
20912.
PHOENIX,
8
Products Inc.
ARIZONA
85036.
A SUBSIDIARY
OF
MOTOROLA
INC.
.,92,0.,
-.