AN6783S

AN6783S PANASONIC

Document overview

• Manufacturer or author: Provided By digicamel.com
• PDF pages: 9

Technical content

IC for long interval timer n 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 15- stage 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. n Features

• Oscillation frequency dispersion of IC itself is small (–5
• Oscillation frequency can be checked by 1/2 fOSC moni- tor terminal
• Wide operating supply voltage range (3.2 V to 18 V)
• Small consumption current (3 mA typ.) n Applications
• Timer n Block Diagram SOP008-P-0225A Unit : mm 0.4±0.25 0.6±0.31.27 5.0±0.3 0.1±0.1 0.3 4.2±0.3 6.5±0.3 0.15 0.65 1.5±0.2 To each block F.F. F.F. F.F.

1 OSC

Mon.

n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC 20 V Supply current I CC 7m A Power dissipation P D 140 mW Operating ambient temperature * T opr -35 to +85 °C Storage temperature * Tstg -55 to +125 °C Stop terminal voltage V STOP 0 to 18 V Reset terminal voltage V RESET 0 to 18 V CR terminal voltage V CR 0 to 3 V Out terminal current I OUT -15 to +15 mA n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 3.2 to 18.0 V Pin No. Symbol Description 1V S Reference voltage

2 Stop Oscillation stop input

3 Reset Reset input

4 GND Grounding

5 CR C and R connection

6 Out Output

8 Mon. Monitor pin n Pin Descriptions 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. n Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Quiescent supply current I CC V CC = 5 V 2.0 4.0 5.0 mA Internal reference voltage V S V CC = 5 V, IS = -3 mA 2.40 2.55 2.70 V High-level input current I IH V CC = 18 V, VIH = 18 V ¾¾ 10 mA Low-level input current I IL V CC = 18 V, VIL = 0 V -100 ¾¾m A High-level out terminal voltage V OH V CC = 18 V, IOH = -10 mA 14.0 16.0 18.0 V Low-level out terminal voltage V OL V CC = 3.2 V, IOL = -10 mA ¾¾ 0.4 V

n Electrical Characteristics at Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit High-level Mon. terminal voltage V MH V CC = 18 V 17.8 ¾ 18.0 V Low-level Mon. terminal voltage V ML V CC = 3.2 V ¾¾ 0.4 V Oscillation frequency precision f OSC V CC = 5 V, RT = 1 kW , 9.0 9.5 10.0 kHz C T = 0.1 mF Oscillation frequency fluctuation withDfV V CC = 5 V, -5.0 ¾ 5.0 % supply voltage 3.2 V to 18.0 V High-level input voltage V IH V CC = 5 V 2.0 ¾¾ V Low-level input voltage V IL V CC = 5 V ¾¾ 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 Conditions Min Typ Max Unit Oscillation frequency- Dfr V CC = 5 V, RT = 1 kW , -5.0 ¾ 5.0 % temperature dependency C T = 0.1 mF Pin No. Equivalent circuit Description I/O DC voltage 1 ¾ V S : O 2.55 V Stabilized power supply output terminal. Reference voltage source for oscillation circuit.

2 Stop : I ¾

Oscillation stop input terminal. Only the oscillation circuit stops when this termi- nal becomes low-level. (F.F. is not cleared) When not used, the terminal should be open or connected to V CC . n Terminal Equivalent Circuits V CCV S Stop

Pin No. Equivalent circuit Description I/O DC voltage

3 Reset : I ¾

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 V CC . The reset is applied by rising VCC from a voltage below 0.8 V (power-on reset function). 4 ¾ GND : ¾ 0 V Grounding terminal. 5 CR : ¾ 0.7 V to 1.8 V 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.

6 Out : O High-level

Output terminal. V CC -1.4 V A frequency which is 1/32768 of the oscillation frequency is outputted. Low-lebel Use with an output current within –10 < 0.4 V mA. 7 ¾ V CC : ¾¾ Supply voltage terminal. 8 Mon. : O High-level Oscillation frequency monitor terminal. V CC The output is given from the first stage of F.F. and a frequency which is 1/2 of Low-level the oscillation frequency fOSC is output- < 0.4 V ted. If not used, the terminal should be open. This terminal is provided for con- necting probe such as oscilloscope. Use it with an output current under 100 mA. n Terminal Equivalent Circuits (continued) V CCV S Reset CR V S V CC Out V CC Mon. RA = 10 kW to 40 kW

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 a 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 kW to 1 MW , and a time interval capacitor in the range of 0.1 mF to 100 mF which is polyester or tantalum electrolytic capacitor with a small tand value. 3. Connect a capacitor (1 mF to 10 mF) to the V S 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 V S terminal with VCC terminal in order to avoid malfunction. n Main Characteristics fOSC ¾ Rt tT ¾ Rt Oscillation frequency fOSC (Hz) 10-2 10-1 103102101 Time decision resistance Rt (kW ) 104 103 102 C t = 0.1 mF C t = 1 mF C t = 10 mF C t = 100 mF Timer interval tT (s) 103 102 103102101 Time decision resistance Rt (kW ) 106 105 104 C t = 0.1 mF C t = 1 mF C t = 10 mF C t = 100 mF

n Main Characteristics (continued) V OH ¾ IOH V OL ¾ IOL fOSC ¾ Ta ICC ¾ VCC ICC ¾ Ta V S ¾ Ta 02 0 Output current IOH (mA) Output voltage VOH (V) 4 8 12 16 V CC = 18 V V CC = 5 V V CC = 3.2 V Ta = 25°C 200 02 0 Output current IOL (mA) Output voltage VOL (mV) 120 160 4 8 12 16 V CC = 18 VV CC = 5 VTa = 25°C 0.98 -50 -25 100 Ambient temperature Ta (°C) Normalized oscillation frequency fOSC (9.505 kHz) 0.99 1.00 1.01 1.02 0 25 50 75 V CC = 5 V R = 1 kW C = 0.1 mF 02 0 Supply voltage VCC (V) Supply current ICC (mA) 4 8 12 16 Ta = 25°C 3.0 3.1 4.0 -50 -25 100 Ambient temperature Ta (°C) Supply current ICC (mA) 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 0 25 50 75 V CC = 18 V V CC = 5 V V CC = 3.2 V V CR = 1.8 V 2.46 2.48 2.62 -50 -25 100 Ambient temperature Ta (°C) Internal reference voltage VS (V) 2.50 2.52 2.54 2.56 2.58 2.60 0 25 50 75 V CC = 18 V V CC = 5 V V CC = 3.2 V

n 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 To Each block F/F F/F F/F Mon.1 V CC R L R t1 mF to 10 mF

• Oscillation period t0(S) » 0.947Rt (W ) · Ct (F)
• Output period t2(S) » t0 · 32768 t2 = 215 · t0 = 32768t0 » 31.03Rt (kW ) · Ct (mF) VCR Monitor Out t C t t2 () t1 = 2t0

n Application Circuit Example (continued) 2. Timer Note) For AN6784 and AN6785, above descriptions can be applied to with regard to their same pin functions. To Each block F/F F/F F/F Mon.1 Reset V CC R L 1 mF to 10 mF tT = 16384t0 » 15.52Rt (kW ) · Ct (mF) VCR Reset High Low High Low Out C t tTtT = 16384t0 R t

• Timer interval

n 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 fre- quency with C and R, and the timer's time becomes short. Since a capacitor of big capacitance is at- tached at pin 5 at this moment, use a power am- plifier which has an output of a totem pole type. (If 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. 2) Place R TEST in parallel with Rt only at the test to lower the resistance, and an oscillation frequency may be high and a timer interval can be short- ened. Pulse generator 1.8 V Oscillation waveform of pin 5 0.7 V AN6783S 5Power amplifier AN6783SR tR TEST