ON MC1455BD Timer Datasheet

MC1455, MC1455B,
NCV1455B
Timers
The 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, 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 Timers
• Timing from Microseconds through Hours
• Operates in Both Astable and Monostable Modes
• Adjustable Duty Cycle
• High Current Output Can Source or Sink 200 mA
• Output Can Drive MTTL
• Temperature Stability of 0.005% per °C
• Normally ON or Normally OFF Output
1.0 k
5
0.01 F
R
1.0 F
1
MT1
G
20M
C
t = 1.1; R and C = 22 sec
Time delay (t) is variable by
changing R and C (see Figure 16).
1N4740
1
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
8
8
3.5 k
XXXXXX
ALYW
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
xx
A
WL, L
YY, Y
WW, W
1
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page ___ of this data sheet.
(Create − Named − OrderingInfoText.)
1N4003
−10 V
XXXXXXXXX
AWL
YYWW
8
117 Vac/60 Hz
6
4
2 MC1455
7
10 k
0.1 F
8
MARKING
DIAGRAMS
Load
MT2
3
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−
10 F
250 V +
Figure 1. 22 Second Solid State Time Delay Relay Circuit
VCC
+
0.01 F
8
Threshold
6
5k
+
Comp
A
−
5
Control Voltage
7
5k
Trigger
+
Comp
−B
2
3
1
4
Figure 2. Representative Block Diagram
March, 2004 − Rev. 8
ISink
ISource
700
7
Discharge
MC1455
Threshold
6
Gnd
1
Trigger
Ith
2.0 k
VS
2
Test circuit for measuring DC parameters (to set output and
measure parameters):
a) When VS 2/3 VCC, VO is low.
b) When VS 1/3 VCC, VO is high.
c) When VO is low, Pin 7 sinks current. To test for Reset, set VO
c) high, apply Reset voltage, and test for current flowing into Pin 7.
c) When Reset is not in use, it should be tied to VCC.
Reset
 Semiconductor Components Industries, LLC, 2004
VCC
Output
5k
Gnd
8
Output
VO
S Inhibit/
Reset
Control
Voltage
4
3
Discharge
Flip
R Flop
Q
Reset
5
VCC
ICC
VR
Figure 3. General Test Circuit
1
Publication Order Number:
MC1455/D
MC1455, MC1455B, NCV1455B
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Power Supply Voltage
Discharge Current (Pin 7)
Power Dissipation (Package Limitation)
P1 Suffix, Plastic Package
Derate above TA = +25°C
D Suffix, Plastic Package
Derate above TA = +25°C
Symbol
Value
Unit
VCC
+18
Vdc
I7
200
mA
PD
625
5.0
625
160
mW
mW/°C
mW
°C/W
PD
Operating Temperature Range (Ambient)
MC1455B
MC1455
NCV1455B
°C
TA
−40 to +85
0 to +70
−40 to +125
Maximum Operating Die Junction Temperature
TJ
+150
°C
Storage Temperature Range
Tstg
−65 to +150
°C
ELECTRICAL CHARACTERISTICS (TA = +25°C, VCC = +5.0 V to +15 V, unless otherwise noted.)
Symbol
Min
Typ
Max
Operating Supply Voltage Range
VCC
4.5
−
16
Supply Current
VCC = 5.0 V, RL = VCC = 15 V, RL = , Low State (Note 1)
ICC
Characteristics
Timing Error (R = 1.0 k to 100 k) (Note 2)
Initial Accuracy C = 0.1 F
Drift with Temperature
Drift with Supply Voltage
Threshold Voltage/Supply Voltage
Vth/VCC
Trigger Voltage
VCC = 15 V
VCC = 5.0 V
Unit
V
mA
−
−
3.0
10
6.0
15
−
−
−
1.0
50
0.1
−
−
−
−
2/3
−
−
−
5.0
1.67
−
−
VT
%
PPM/°C
%/V
V
Trigger Current
IT
−
0.5
−
A
Reset Voltage
VR
0.4
0.7
1.0
V
Reset Current
IR
−
0.1
−
mA
Threshold Current (Note 3)
Ith
−
0.1
0.25
A
Idischg
−
−
100
nA
9.0
2.6
10
3.33
11
4.0
−
−
−
−
−
−
0.1
0.4
2.0
2.5
−
0.25
0.25
0.75
2.5
−
−
0.35
−
12.75
2.75
12.5
13.3
3.3
−
−
−
Discharge Leakage Current (Pin 7)
Control Voltage Level
VCC = 15 V
VCC = 5.0 V
VCL
Output Voltage Low
ISink = 10 mA (VCC = 15 V)
ISink = 50 mA (VCC = 15 V)
ISink = 100 mA (VCC = 15 V)
ISink = 200 mA (VCC = 15 V)
ISink = 8.0 mA (VCC = 5.0 V)
ISink = 5.0 mA (VCC = 5.0 V)
VOL
Output Voltage High
VCC = 15 V (ISource = 200 mA)
VCC = 15 V (ISource = 100 mA)
VCC = 5.0 V (ISource = 100 mA)
VOH
V
V
V
Rise Time Differential Output
tr
−
100
−
ns
Fall Time Differential Output
tf
−
100
−
ns
1.
2.
3.
4.
‘Supply current when output is high is typically 1.0 mA less.
Tested at VCC = 5.0 V and VCC = 15 V Monostable mode.
This will determine the maximum value of RA + RB for 15 V operation. The maximum total R = 20 M .
Tlow = 0°C for MC1455, Tlow = −40°C for MC1455B, NCV1455B
Thigh = +70°C for MC1455, Thigh = +85°C for MC1455B, Thigh = +125°C for NCV1455B
5. NCV prefix is for Automotive and other applications requiring site and change control.
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MC1455, MC1455B, NCV1455B
10
125
ICC , SUPPLY CURRENT (mA)
PW, PULSE WIDTH (ns min)
150
100
75
0°C
50
25°C
70°C
25
0
0
0.1
0.2
0.3
10
15
Figure 4. Trigger Pulse Width
Figure 5. Supply Current
10
VOL, LOW OUTPUT VOLTAGE (Vdc)
VCC −VOH (Vdc)
2.0
VCC, SUPPLY VOLTAGE (Vdc)
1.6
1.4
25°C
1.2
1.0
0.8
0.6
0.4
5.0 V ≤ VCC ≤ 15 V
2.0
5.0
10
20
50
25°C
1.0
0.1
0.01
1.0
100
2.0
5.0
10
20
ISource (mA)
ISink (mA)
Figure 6. High Output Voltage
Figure 7. Low Output Voltage
@ VCC = 5.0 Vdc
10
50
100
10
VOL, LOW OUTPUT VOLTAGE (Vdc)
VOL, LOW OUTPUT VOLTAGE (Vdc)
4.0
VT(min), MINIMUM TRIGGER VOLTAGE (x VCC = Vdc)
1.8
25°C
1.0
0.1
0.01
1.0
6.0
0
5.0
0.4
2.0
0.2
0
1.0
25°C
8.0
2.0
5.0
10
20
50
1.0
0.01
1.0
100
25°C
0.1
2.0
5.0
10
20
50
ISink (mA)
ISink (mA)
Figure 8. Low Output Voltage
@ VCC = 10 Vdc
Figure 9. Low Output Voltage
@ VCC = 15 Vdc
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100
MC1455, MC1455B, NCV1455B
t d, DELAY TIME NORMALIZED
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0
5.0
10
15
1.010
1.005
1.000
0.995
0.990
0.985
− 75
20
− 50
− 25
0
25
50
75
100
VCC, SUPPLY VOLTAGE (Vdc)
TA, AMBIENT TEMPERATURE (°C)
Figure 10. Delay Time versus Supply Voltage
Figure 11. Delay Time versus Temperature
300
t pd , PROPAGATION DELAY TIME (ns)
t d, DELAY TIME NORMALIZED
1.015
250
200
150
0°C
100
70°C
25°C
50
0
0
0.1
0.2
0.3
VT(min), MINIMUM TRIGGER VOLTAGE (x VCC = Vdc)
Figure 12. Propagation Delay
versus Trigger Voltage
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0.4
125
MC1455, MC1455B, NCV1455B
Control Voltage
Threshold
Comparator
Trigger
Comparator
Flip−Flop
Output
VCC
4.7 k
830
4.7k
6.8 k
1.0 k
5.0 k
Threshold
7.0 k
3.9 k
10 k
Output
cb
e
5.0 k
b
c
4.7 k
Trigger
220
Reset
Reset
Discharge
Gnd
100 k
4.7 k
5.0 k
Discharge
100
Figure 13. Representative Circuit Schematic
GENERAL OPERATION
The MC1455 is a monolithic timing circuit which uses an
external resistor − capacitor network as its timing element. It
can be used in both the monostable (one−shot) and astable
modes with frequency and duty cycle controlled by the
capacitor and resistor values. While the timing is dependent
upon the external passive components, the monolithic circuit
provides the starting circuit, voltage comparison and other
functions needed for a complete timing circuit. Internal to the
integrated circuit are two comparators, one for the input
signal and the other for capacitor voltage; also a flip−flop and
digital output are included. The comparator reference
voltages are always a fixed ratio of the supply voltage thus
providing output timing independent of supply voltage.
has been triggered by an input signal, it cannot be retriggered
until the present timing period has been completed. The time
that the output is high is given by the equation t = 1.1 RA C.
Various combinations of R and C and their associated times
are shown in Figure 16. The trigger pulse width must be less
than the timing period.
A reset pin is provided to discharge the capacitor, thus
interrupting the timing cycle. As long as the reset pin is low,
the capacitor discharge transistor is turned “on” and
prevents the capacitor from charging. While the reset
voltage is applied the digital output will remain the same.
The reset pin should be tied to the supply voltage when not
in use.
Monostable Mode
+VCC (5.0 V to 15 V)
In the monostable mode, a capacitor and a single resistor
are used for the timing network. Both the threshold terminal
and the discharge transistor terminal are connected together
in this mode (refer to circuit in Figure 14). When the input
voltage to the trigger comparator falls below 1/3 VCC, the
comparator output triggers the flip−flop so that its output
sets low. This turns the capacitor discharge transistor “off”
and drives the digital output to the high state. This condition
allows the capacitor to charge at an exponential rate which
is set by the RC time constant. When the capacitor voltage
reaches 2/3 VCC, the threshold comparator resets the
flip−flop. This action discharges the timing capacitor and
returns the digital output to the low state. Once the flip−flop
Reset
4
RL
VCC
8
Output
3
RL
MC1455
RA
Discharge
7
6
Threshold
5
2
Trigger
1
Control
Voltage
Figure 14. Monostable Circuit
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C
0.01 F
MC1455, MC1455B, NCV1455B
100
C, CAPACITANCE ( µ F)
10
1.0
0.1
0.01
0.001
10 s
t = 50 s/cm
(RA = 10 k, C = 0.01 F, RL = 1.0 k, VCC = 15 V)
100 s 1.0 ms
Figure 15. Monostable Waveforms
10 ms 100 ms
td, TIME DELAY (s)
1.0
10
100
Figure 16. Time Delay
+VCC (5.0 V to 15 V)
Reset
4
RL
Output
3
7Discharge
6Threshold
MC1455
Trigger
RB
5
Control
Voltage
2
RL
RA
VCC
8
1
C
t = 20 s/cm
(RA = 5.1 k, C = 0.01 F, RL = 1.0 k; RB = 3.9 k, VCC = 15 V)
Figure 17. Astable Circuit
Figure 18. Astable Waveforms
Astable Mode
In the astable mode the timer is connected so that it will
retrigger itself and cause the capacitor voltage to oscillate
between 1/3 VCC and 2/3 VCC. See Figure 17.
The external capacitor changes to 2/3 VCC through RA and
RB and discharges to 1/3 VCC through RB. By varying the
ratio of these resistors the duty cycle can be varied. The
charge and discharge times are independent of the supply
voltage.
The charge time (output high) is given by:
To obtain the maximum duty cycle 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 by:
RA VCC(Vdc)
VCC(Vdc)
0.2
I7 (A)
100
t1 0.695 (RA RB) C
C, CAPACITANCE ( µ F)
The discharge time (output low) is given by:
t2 0.695 (RB) C
Thus the total period is given by:
T t1 t2 0.695 (RA 2RB) C
The frequency of oscillation is then: f 1 1
1.44
(RA 2RB)C
1.0
0.1
0.01
(RA + 2 RB)
and may be easily found as shown in Figure 19.
The duty cycle is given by:
10
0.001
0.1
RB
DC RA 2RB
1.0
10
100
1.0 k
10 k
f, FREE RUNNING FREQUENCY (Hz)
Figure 19. Free Running Frequency
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100
MC1455, MC1455B, NCV1455B
APPLICATIONS INFORMATION
Linear Voltage Ramp
Missing Pulse Detector
In the monostable mode, the resistor can be replaced by a
constant current source to provide a linear ramp voltage. The
capacitor still charges from 0 VCC to 2/3 VCC. The linear
ramp time is given by:
The timer can be used to produce an output when an input
pulse fails to occur within the delay of the timer. To
accomplish this, set the time delay to be slightly longer than
the time between successive input pulses. The timing cycle
is then continuously reset by the input pulse train until a
change in frequency or a missing pulse allows completion of
the timing cycle, causing a change in the output level.
t=
2 VCC
, where I =
3
1
VCC − VB − VBE
RE
If VB is much larger than VBE, then t can be made
independent of VCC.
+VCC (5.0 V to 15 V)
VCC
Reset
4
8
VCC
RE
Digital 3
Output
7
MC1455
Trigger
VE
2
5
1
0.01 F
Sweep
Output
Discharge
Output
MC1455
VB
I
6
Input
2
7
Threshold
6 Control
5 Voltage
Trigger
R2
C
0.01 F
1
C
RA
8
3
R1
2N4403
or Equiv
VCC
Reset
4
RL
2N4403
or Equiv
Control
Voltage
Figure 20. Linear Voltage Sweep Circuit
Figure 21. Missing Pulse Detector
t = 100 s/cm
t = 500 s/cm
(RE = 10 k, R2 = 100 k, R1 = 39 k, C = 0.01 F, VCC = 15 V)
(RA = 2.0 k, RL = 1.0 k, C = 0.01 F, VCC = 15 V)
Figure 22. Linear Voltage Ramp Waveforms
Figure 23. Missing Pulse Detector Waveforms
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MC1455, MC1455B, NCV1455B
Pulse Width Modulation
If the timer is triggered with a continuous pulse train in the
monostable mode of operation, the charge time of the
capacitor can be varied by changing the control voltage at
Pin 5. In this manner, the output pulse width can be
modulated by applying a modulating signal that controls the
threshold voltage.
+VCC (5.0 V to 15 V)
RA
RL
4
8
t = 0.5 ms/cm
(RA = 10 k, C = 0.02 F, VCC = 15 V)
7
3
C
Output
Figure 25. Pulse Width Modulation Waveforms
6
MC1455
2
5
Clock
Input
Test Sequences
Modulation
Input
1
Several timers can be connected to drive each other for
sequential timing. An example is shown in Figure 26 where
the sequence is started by triggering the first timer which
runs for 10 ms. The output then switches low momentarily
and starts the second timer which runs for 50 ms and so forth.
Figure 24. Pulse Width Modulator
VCC (5.0 V to 15 V)
9.1 k
27 k
8
9.1 k
4
8
5 0.01 F
6
7
8
5 0.01 F
3
0.001 F
1.0 F
2
1
5.0 F
4
5 0.01 F
6
7
MC1455
2
3
18.2 k
4
6
MC1455
7
27 k
MC1455
3
2
0.001 F
5.0 F
1
Load
1
Load
Load
Figure 26. Sequential Timer
DEVICE ORDERING INFORMATION
Device
Operating Temperature Range
Package
Shipping
MC1455P1
TA = 0°C to +70°C
Plastic Dip
50 Units/Rail
MC1455D
TA = 0°C to +70°C
SO−8
98 Units/Rail
TA = −40°C to +85°C
SO−8
98 Units/Rail
MC1455BP1
TA = −40°C to +85°C
Plastic Dip
50 Units/Rail
NCV1455BDR2*
TA = −40°C to +125°C
SO−8
2500/Tape & Rail
MC1455BD
*NCV prefix is for automotive and other applications requiring site and control changes.
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MC1455, MC1455B, NCV1455B
PACKAGE DIMENSIONS
P1 SUFFIX
PLASTIC PACKAGE
CASE 626−05
ISSUE L
8
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
5
−B−
1
4
F
−A−
NOTE 2
L
C
J
−T−
N
SEATING
PLANE
D
H
M
K
G
0.13 (0.005)
M
T A
M
B
M
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9
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MILLIMETERS
MIN
MAX
9.40
10.16
6.10
6.60
3.94
4.45
0.38
0.51
1.02
1.78
2.54 BSC
0.76
1.27
0.20
0.30
2.92
3.43
7.62 BSC
−−−
10
0.76
1.01
INCHES
MIN
MAX
0.370
0.400
0.240
0.260
0.155
0.175
0.015
0.020
0.040
0.070
0.100 BSC
0.030
0.050
0.008
0.012
0.115
0.135
0.300 BSC
−−−
10
0.030
0.040
MC1455, MC1455B, NCV1455B
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC PACKAGE
CASE 751−07
(SO−8)
ISSUE AA
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN
EXCESS OF THE D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
6. 751−01 THRU 751−06 ARE OBSOLETE. NEW
STANDARD IS 751−07.
−X−
A
8
5
S
B
0.25 (0.010)
M
Y
M
1
4
K
−Y−
G
C
N
X 45 SEATING
PLANE
−Z−
0.10 (0.004)
H
D
0.25 (0.010)
M
Z Y
S
X
M
J
S
DIM
A
B
C
D
G
H
J
K
M
N
S
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
1.35
1.75
0.33
0.51
1.27 BSC
0.10
0.25
0.19
0.25
0.40
1.27
0
8
0.25
0.50
5.80
6.20
INCHES
MIN
MAX
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.050 BSC
0.004
0.010
0.007
0.010
0.016
0.050
0
8
0.010
0.020
0.228
0.244
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
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operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
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MC1455/D
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