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ICs for Timer
AN6783S
IC for long interval timer
s Overview
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.
0.40.25 0.60.3
Unit : mm
1 2 1.27 3 4
8 7 6 5 5.00.3 1.50.2 0.15 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.)
0.10.1 0.3 4.20.3 6.50.3
s Features
SOP008-P-0225A
s Applications
* Timer
s Block Diagram
Mon. VCC Out CR
OSC
8
7
6
F.F. 15 To each block Voltage stabilizer
F.F. 2
F.F. 1
Input circuit
Input circuit
1
2
3
Stop
Reset
VS
GND
4
5
1
AN6783S
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 Symbol VS Stop Reset GND CR Out VCC Mon. Description Reference voltage Oscillation stop input Reset input Grounding C and R connection Output Supply voltage Monitor pin
ICs for Timer
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature
* *
Symbol VCC ICC PD Topr Tstg VSTOP VRESET VCR IOUT
Rating 20 7 140 -35 to +85 -55 to +125 0 to 18 0 to 18 0 to 3 -15 to +15
Unit V mA mW C C V V V mA
Stop terminal voltage Reset terminal voltage CR terminal voltage Out terminal current
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 = 25C.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 3.2 to 18.0 Unit V
s Electrical Characteristics at Ta = 25C
Parameter Quiescent supply current Internal reference voltage High-level input current Low-level input current High-level out terminal voltage Low-level out terminal voltage Symbol ICC VS IIH IIL VOH VOL Conditions VCC = 5 V VCC = 5 V, IS = -3 mA VCC = 18 V, VIH = 18 V VCC = 18 V, VIL = 0 V VCC = 18 V, IOH = -10 mA VCC = 3.2 V, IOL = -10 mA Min 2.0 2.40 -100 14.0 Typ 4.0 2.55 16.0 Max 5.0 2.70 10 18.0 0.4 Unit mA V A A V V
2
ICs for Timer
s Electrical Characteristics at Ta = 25C (continued)
Parameter High-level Mon. terminal voltage Low-level Mon. terminal voltage Oscillation frequency precision Oscillation frequency fluctuation with supply voltage High-level input voltage Low-level input voltage * Design reference data Symbol VMH VML fOSC fV VIH VIL Conditions VCC = 18 V VCC = 3.2 V VCC = 5 V, RT = 1 k, CT = 0.1 F VCC = 5 V, 3.2 V to 18.0 V VCC = 5 V VCC = 5 V -5.0 2.0 Min 17.8 9.0 Typ 9.5
AN6783S
Max 18.0 0.4 10.0 5.0 0.8
Unit V V kHz % V V
Note) The characteristic values below are theoretical values for designing and not guaranteed. The data show the changing amount within Ta = -35C to +85C when the values at Ta = 25C is taken as the reference.
Parameter Oscillation frequencytemperature dependency
Symbol fr
Conditions VCC = 5 V, RT = 1 k, CT = 0.1 F
Min -5.0
Typ
Max 5.0
Unit %
s Terminal Equivalent Circuits
Pin No. 1 Equivalent circuit Description VS : Stabilized power supply output terminal. Reference voltage source for oscillation circuit. 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/O O DC voltage 2.55 V
2
VS
VCC
I
Stop
3
AN6783S
s Terminal Equivalent Circuits (continued)
Pin No. 3 Equivalent circuit VS VCC Description 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). GND : Grounding terminal. 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.
ICs for Timer
I/O I
DC voltage
Reset 4 5 0V 0.7 V to 1.8 V
CR VS
6
VCC
Out
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 Low-lebel < 0.4 V
7 8
VCC
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 A.
O
High-level VCC Low-level < 0.4 V
RA = 10 k to 40 k Mon.
4
ICs for Timer
s Usage Notes
AN6783S
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 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 k to 1 M, and a time interval capacitor in the range of 0.1 F to 100 F which is polyester or tantalum electrolytic capacitor with a small tan value. 3. Connect a capacitor (1 F to 10 F) 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.
s Main Characteristics
104
fOSC Rt
106
tT Rt
103
105
Ct = 100 F
Oscillation frequency fOSC (Hz)
102
Ct = 0.1 F
104
Ct = 10 F
Timer interval tT (s)
10
Ct = 1 F
103
Ct = 1 F
1
Ct = 10 F
102
Ct = 0.1 F
10-1
Ct = 100 F
10
10-2 1 10 102 103
1 1 10 102 103
Time decision resistance Rt (k)
Time decision resistance Rt (k)
5
AN6783S
s Main Characteristics (continued)
VOH IOH
20 Ta = 25C VCC = 18 V 16 160 200 Ta = 25C
ICs for Timer
VOL IOL
VCC = 5 V VCC = 18 V
12
Output voltage VOL (mV)
VCC = 5 V VCC = 3.2 V 4 8 12 16
Output voltage VOH (V)
120
8
80
4
40
0 0 20
0 0 4 8 12 16 20
Output current IOH (mA)
Output current IOL (mA)
fOSC Ta
Normalized oscillation frequency fOSC (9.505 kHz)
10
ICC VCC
VCC = 5 V R = 1 k C = 0.1 F
Ta = 25C
1.02
8
1.01
Supply current ICC (mA)
-25 0 25 50 75 100
6
1.00
4
0.99
2
0.98 -50
0 0 4 8 12 16 20
Ambient temperature Ta (C)
Supply voltage VCC (V)
ICC Ta
4.0 3.9 3.8 VCR = 1.8 V
VS Ta
2.62 2.60
Internal reference voltage VS (V)
Supply current ICC (mA)
2.58 2.56 2.54 2.52 2.50 2.48 2.46 -50 VCC = 18 V VCC = 5 V VCC = 3.2 V
3.7 VCC = 18 V 3.6 3.5 3.4 3.3 3.2 3.1 3.0 -50 -25 0 25 50 75 100 VCC = 5 V VCC = 3.2 V
-25
0
25
50
75
100
Ambient temperature Ta (C)
Ambient temperature Ta (C)
6
ICs for Timer
s Application Circuit Example
AN6783S
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
RL
8 Mon.
7 VCC
6 Out
5 CR
Ct
To Each block
F/F 15
F/F 2
F/F 1
OSC
* Oscillation period t0(S) 0.947Rt () * Ct (F) * Output period t2(S) t0 x 32768 31.03Rt (k) * Ct (F)
Voltage stabilizer
Input circuit
Input circuit
VS 1
Stop 2
Reset 3
VCC
1 F to 10 F
Rt
VCR t0 Monitor t1 Out t2 t1 = 2t0
GND 4
(t = 2 x t ) = 32768t
2
15
0
0
7
AN6783S
s Application Circuit Example (continued)
2. Timer VCC
ICs for Timer
8 Mon.
7 VCC
6 Out
5 CR
Ct
To Each block
F/F 15
F/F 2
F/F 1
OSC
* Timer interval tT = 16384t0 = 16384 x 0.947Rt () * Ct (F) 15.52Rt (k) * Ct (F)
Voltage stabilizer
Input circuit
Input circuit
VS 1
Stop 2
Reset 3
GND 4
RL
1 F to 10 F
Reset
Rt
VCR t0
High 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
s 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 shortened. 1 RTEST Rt 5 AN6783S
AN6783S
1 AN6783S 5
9

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