PANASONIC AN6783S

ICs for Timer
AN6783S
IC for long interval timer
■ Overview
8
2
7
3
6
4
5
0.15
0.3
4.2±0.3
0.65
• Oscillation frequency dispersion of IC itself is small (±5
%)
• Oscillation frequency can be checked by 1/2 fOSC monitor terminal
• Wide operating supply voltage range (3.2 V to 18 V)
• Small consumption current (3 mA typ.)
1.5±0.2
0.1±0.1
■ Features
1
5.0±0.3
1.27
0.6±0.3
0.4±0.25
Unit : mm
The AN6783S is an IC designed for a long interval
timer. It is oscillated by using the external resistor and
capacitor, and the oscillation frequency divided by a 15stage F.F. is provided as the output.
It is frequency divider type, so that a long interval
timer can be constructed by using a capacitor with small
capacitance.
6.5±0.3
SOP008-P-0225A
■ Applications
• Timer
F.F.
15
F.F.
2
F.F.
1
CR
5
6
8
7
Out
VCC
Mon.
■ Block Diagram
OSC
To each
block
4
GND
3
Input
circuit
Reset
2
Input
circuit
Stop
VS
1
Voltage
stabilizer
1
AN6783S
ICs for Timer
■ Pin Descriptions
Pin No.
Symbol
Description
1
VS
2
Stop
Oscillation stop input
3
Reset
Reset input
4
GND
Grounding
5
CR
C and R connection
6
Out
Output
7
VCC
Supply voltage
8
Mon.
Monitor pin
Reference voltage
■ Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Supply voltage
VCC
20
V
Supply current
ICC
7
mA
PD
140
mW
Topr
−35 to +85
°C
Tstg
−55 to +125
°C
Stop terminal voltage
VSTOP
0 to 18
V
Reset terminal voltage
VRESET
0 to 18
V
CR terminal voltage
VCR
0 to 3
V
Out terminal current
IOUT
−15 to +15
mA
Power dissipation
Operating ambient temperature
Storage temperature
*
*
Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned.
For circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC.
2. *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
Range
Unit
VCC
3.2 to 18.0
V
■ Electrical Characteristics at Ta = 25°C
Parameter
2
Symbol
Conditions
Min
Typ
Max
Unit
Quiescent supply current
ICC
VCC = 5 V
2.0
4.0
5.0
mA
Internal reference voltage
VS
VCC = 5 V, IS = −3 mA
2.40
2.55
2.70
V
High-level input current
IIH
VCC = 18 V, VIH = 18 V


10
µA
Low-level input current
IIL
VCC = 18 V, VIL = 0 V
−100


µA
High-level out terminal voltage
VOH
VCC = 18 V, IOH = −10 mA
14.0
16.0
18.0
V
Low-level out terminal voltage
VOL
VCC = 3.2 V, IOL = −10 mA


0.4
V
ICs for Timer
AN6783S
■ Electrical Characteristics at Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
High-level Mon. terminal voltage
VMH
VCC = 18 V
17.8

18.0
V
Low-level Mon. terminal voltage
VML
VCC = 3.2 V


0.4
V
Oscillation frequency precision
fOSC
VCC = 5 V, RT = 1 kΩ,
9.0
9.5
10.0
kHz
CT = 0.1 µF
Oscillation frequency fluctuation with
supply voltage
∆fV
VCC = 5 V,
3.2 V to 18.0 V
−5.0

5.0
%
High-level input voltage
VIH
VCC = 5 V
2.0


V
Low-level input voltage
VIL
VCC = 5 V


0.8
V
• Design reference data
Note) The characteristic values below are theoretical values for designing and not guaranteed.
The data show the changing amount within Ta = −35°C to +85°C when the values at Ta = 25°C is taken as the reference.
Parameter
Symbol
∆fr
Oscillation frequency-
Conditions
VCC = 5 V, RT = 1 kΩ,
Min
Typ
Max
Unit
−5.0

5.0
%
CT = 0.1 µF
temperature dependency
■ Terminal Equivalent Circuits
Pin No.
Equivalent circuit
Description
I/O
DC
voltage
1

VS :
Stabilized power supply output terminal.
Reference voltage source for oscillation
circuit.
O
2.55 V
Stop :
Oscillation stop input terminal. Only the
oscillation circuit stops when this terminal becomes low-level.
(F.F. is not cleared)
When not used, the terminal should be
open or connected to VCC .
I

2
VS
VCC
Stop
3
AN6783S
ICs for Timer
■ Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
3
VS
VCC
Description
I/O
DC
voltage
Reset :
Reset input terminal.
F.F. is reset when the terminal becomes
low-level and is set in the initial state.
When not used, the terminal should be
open or connected to VCC .
The reset is applied by rising VCC from a
voltage below 0.8 V (power-on reset
function).
I

GND :
Grounding terminal.

0V
CR :
C and R connection terminal.
The oscillation period is determined by
an external resistor and capacitor.
When applying a pulse to this terminal
from the outside, the voltage should be
within the range of 0 V to 3 V.

0.7 V to 1.8 V
Out :
Output terminal.
A frequency which is 1/32768 of the
oscillation frequency is outputted.
Use with an output current within ±10
mA.
O
High-level
VCC −1.4 V
VCC :
Supply voltage terminal.


Mon. :
Oscillation frequency monitor terminal.
The output is given from the first stage
of F.F. and a frequency which is 1/2 of
the oscillation frequency fOSC is outputted. If not used, the terminal should be
open. This terminal is provided for connecting probe such as oscilloscope. Use
it with an output current under 100 µA.
O
High-level
VCC
Reset

4
5
CR
VS
6
VCC
Out

7
8
VCC
RA = 10 kΩ to 40 kΩ
Mon.
4
Low-lebel
< 0.4 V
Low-level
< 0.4 V
ICs for Timer
AN6783S
■ Usage Notes
Pay attention to the following matters in order to prevent the destruction during the use and to increase the reliability ;
1. In the application circuit example, the calculated value by the theoretical equation for timer interval calculation and
the characteristics curve vary depending on the precision of the time interval capacitor used in the actual set. Take
such matter of the above into consideration.
Also, the proportional constant α depends on the kinds and characteristics of the time interval resistor and time
interval capacitor.
Make a final confirmation with the finished products.
In the case when a high precision is required, adjust the value by using a variable resistor as the time interval
resistor.
2. Use a time interval resistor in the range of 1 kΩ to 1 MΩ, and a time interval capacitor in the range of 0.1 µF to
100 µF which is polyester or tantalum electrolytic capacitor with a small tanδ value.
3. Connect a capacitor (1 µF to 10 µF) to the VS terminal in order to protect the IC from an external noise and stabilize
its operation.
4. If turning on power again after an extremely short-time power supply off state during the normal operation, be
careful that there may be a case that the automatic reset (power-on reset) fails due to a residual potential of the
external capacitance.
5. Take measures against noise in order to avoid the malfunction caused by the external noise. Pay attention to the
noise from an external source especially at setting a long interval time.
6. When connecting a plunger or relay to the output circuit, connect a diode to the both ends of coil in order to
protect the IC from the counter-electromotive force generted after the circuit is turned off .
7. Do not short circuit the VS terminal with VCC terminal in order to avoid malfunction.
■ Main Characteristics
fOSC  Rt
104
Ct = 100 µF
105
103
Ct = 0.1 µF
102
Ct = 1 µF
10
Ct = 10 µF
1
Ct = 1 µF
103
Ct = 0.1 µF
102
Ct = 100 µF
10−1
Ct = 10 µF
104
Timer interval tT (s)
Oscillation frequency fOSC (Hz)
tT  Rt
106
10
10−2
1
1
10
102
Time decision resistance Rt (kΩ)
103
1
10
102
103
Time decision resistance Rt (kΩ)
5
AN6783S
ICs for Timer
■ Main Characteristics (continued)
VOH  IOH
VOL  IOL
20
200
Ta = 25°C
Ta = 25°C
VCC = 5 V
VCC = 18 V
VCC = 18 V
160
Output voltage VOL (mV)
Output voltage VOH (V)
16
12
8
4
120
80
40
VCC = 5 V
VCC = 3.2 V
0
0
0
4
8
12
16
20
0
4
Output current IOH (mA)
8
1.02
Ta = 25°C
8
1.01
1.00
0.99
6
4
2
−25
0
0
25
50
75
100
0
4
8
12
16
Ambient temperature Ta (°C)
Supply voltage VCC (V)
ICC  Ta
VS  Ta
4.0
20
2.62
VCR = 1.8 V
3.9
Internal reference voltage VS (V)
2.60
3.8
3.7
VCC = 18 V
3.6
3.5
VCC = 5 V
3.4
VCC = 3.2 V
3.3
3.2
2.58
2.56
VCC = 18 V
2.54
VCC = 5 V
2.52
VCC = 3.2 V
2.50
2.48
3.1
3.0
−50
20
ICC  VCC
VCC = 5 V
R = 1 kΩ
C = 0.1 µF
0.98
−50
Supply current ICC (mA)
16
10
Supply current ICC (mA)
Normalized oscillation frequency fOSC (9.505 kHz)
fOSC  Ta
−25
0
25
50
Ambient temperature Ta (°C)
6
12
Output current IOL (mA)
75
100
2.46
−50
−25
0
25
50
Ambient temperature Ta (°C)
75
100
ICs for Timer
AN6783S
■ Application Circuit Example
The AN6783S can be used as an integrator-type timer and as a long time timer using a stop pin. It is also usable
as a ultra low frequency oscillator.
1. Ultra low frequency oscillation circuit
F/F
2
F/F
1
Input
circuit
1 µF to 10 µF
5 CR
OSC
• Output period
t2(S) ≈ t0 × 32768
≈ 31.03Rt (kΩ) · Ct (µF)
Reset 3
VCC
• Oscillation period
t0(S) ≈ 0.947Rt (Ω) · Ct (F)
Input
circuit
Stop 2
VS 1
Voltage
stabilizer
Ct
GND 4
F/F
15
To
Each
block
6 Out
7 VCC
8 Mon.
RL
Rt
VCR
t0
Monitor
t1
t1 = 2t0
Out
t2
×t
( t == 232768t
)
2
15
0
0
7
AN6783S
ICs for Timer
■ Application Circuit Example (continued)
2. Timer
5 CR
• Timer interval
tT = 16384t0
= 16384 × 0.947Rt (Ω) · Ct (F)
≈ 15.52Rt (kΩ) · Ct (µF)
OSC
Input
circuit
Input
circuit
1 µF to 10 µF
RL
Ct
GND 4
VS 1
Voltage
stabilizer
F/F
1
Reset 3
To
Each
block
F/F
2
Stop 2
F/F
15
6 Out
7 VCC
8 Mon.
VCC
Rt
Reset
VCR
High
t0
Reset
Low
Out
High
Low
tT = 16384t0
tT
Note) For AN6784 and AN6785, above descriptions can be applied to with regard to their same pin functions.
8
ICs for Timer
AN6783S
■ Application Circuit Example (continued)
3. Quick check of the operation of the equipment which uses AN6783S
1) Input to pin 5 a higher frequency than the frequency with C and R, and the timer's time becomes
short. Since a capacitor of big capacitance is attached at pin 5 at this moment, use a power amPulse
Power
plifier which has an output of a totem pole type. (If
generator
amplifier
the output of a pulse generator is large enough, it
is not necessary.) But be careful to keep an input
waveform of 1.8 V or less.
Oscillation waveform of pin 5
2) Place RTEST in parallel with Rt only at the test to
1.8 V
lower the resistance, and an oscillation frequency
0.7 V
may be high and a timer interval can be short-
1
AN6783S
5
ened.
1
RTEST
Rt
AN6783S
5
9