AN6783S. IC for long interval timer. ICs for Timer. Overview. Features. Applications. Block Diagram
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1 IC for long interval timer Overview The 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 - 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. 0.±0.. 0.±0. Unit : mm.0±0. Features Oscillation frequency dispersion of IC itself is small (± %) Oscillation frequency can be checked by / f OSC monitor terminal Wide operating supply voltage range (. V to V) Small consumption current ( ma typ.) 0.±0. 0..±0..±0. SOP00-P-0A ±0. Applications Timer Block Diagram To each block Mon. Voltage stabilizer V S F.F. F.F. Stop F.F. OSC GND CR
2 ICs for Timer Pin Descriptions Pin No. Symbol Description V S Reference voltage Stop Oscillation stop input input GND Grounding CR C and R connection put Supply voltage Mon. Monitor pin Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage 0 V Supply current I CC ma Power dissipation P D 0 mw Operating ambient temperature * T opr to + C Storage temperature * T stg to + C Stop terminal voltage V STOP 0 to V terminal voltage V RESET 0 to V CR terminal voltage V CR 0 to V terminal current I OUT to + ma Note). Do not apply external currents or voltages to any pins not specifically mentioned. For currents, '+' denotes current flowing into the IC, and ' ' denotes current flowing out of the IC.. *: Except for the operating ambient temperature and storage temperature, all ratings are for T a = C. Recommended Operating Range Parameter Symbol Range Unit Supply voltage. to.0 V Electrical Characteristics at T a = C Parameter Symbol Conditions Min Typ Max Unit Quiescent supply current I CC = V ma Internal reference voltage V S = V, I S = ma.0..0 V High-level input current I IH = V, V IH = V 0 µa Low-level input current I IL = V, V IL = 0 V 00 µa High-level out terminal voltage V OH = V, I OH = 0 ma V Low-level out terminal voltage V OL =. V, I OL = 0 ma 0. V
3 Electrical Characteristics at T a = C (continued) Parameter Symbol Conditions Min Typ Max Unit High-level Mon. terminal voltage V MH = V..0 V Low-level Mon. terminal voltage V ML =. V 0. V Oscillation frequency precision f OSC = V, R T = kω, khz C T = 0. µf Oscillation frequency fluctuation with f V = V,.0.0 % supply voltage. V to.0 V High-level input voltage V IH = V.0 V Low-level input voltage V IL = V 0. V Design reference data Note) The characteristic values below are theoretical values for designing and not guaranteed. The data show the changing amount within T a = C to + C when the values at T a = C is taken as the reference. Parameter Symbol Conditions Min Typ Max Unit Oscillation frequency- f r = V, R T = kω,.0.0 % temperature dependency C T = 0. µf Terminal Equivalent Circuits Pin No. Equivalent Description I/O DC voltage V S : O. V Stabilized power supply output terminal. Reference voltage source for oscillation. Stop : I V VS CC Oscillation stop input terminal. Only the oscillation stops when this terminal becomes low-level. (F.F. is not cleared) When not used, the terminal should be open or connected to. Stop
4 ICs for Timer Terminal Equivalent Circuits (continued) DC Pin No. Equivalent Description I/O voltage V : I VS CC 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. The reset is applied by rising from a voltage below 0. V (power-on reset function). GND : 0 V Grounding terminal. CR : 0. V to. V CR V S 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 V. : O High-level put terminal.. V A frequency which is / of the oscillation frequency is outputted. Low-lebel Use with an output current within ±0 < 0. V ma. : Supply voltage terminal. Mon. : O High-level Oscillation frequency monitor terminal. The output is given from the first stage RA = 0 kω to 0 kω of F.F. and a frequency which is / of Low-level Mon. the oscillation frequency f OSC is output- < 0. V ted. 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 00 µa.
5 Usage Notes Pay attention to the following matters in order to prevent the destruction during the use and to increase the reliability ;. In the application 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.. Use a time interval resistor in the range of kω to MΩ, and a time interval capacitor in the range of 0. µf to 00 µf which is polyester or tantalum electrolytic capacitor with a small tanδ value.. Connect a capacitor ( µf to 0 µf) to the V S terminal in order to protect the IC from an external noise and stabilize its operation.. 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.. 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.. When connecting a plunger or relay to the output, connect a diode to the both ends of coil in order to protect the IC from the counter-electromotive force generted after the is turned off.. Do not short the V S terminal with terminal in order to avoid malfunction. Main Characteristics 0 f OSC R t 0 t T R t 0 0 C t = 00 µf Oscillation frequency f OSC (Hz) 0 Ct = 0. µf Ct = µf 0 C t = 0 µf Timer interval t T (s) C t = 0 µf C t = µf C t = 0. µf 0 C t = 00 µf Time decision resistance R t (kω) Time decision resistance R t (kω)
6 ICs for Timer Main Characteristics (continued) V OH I OH V OL I OL 0 T a = C 00 T a = C = V = V = V 0 put voltage V OH (V) put voltage V OL (mv) 0 0 = V 0 =. V put current I OH (ma) put current I OL (ma) Normalized oscillation frequency f OSC (9.0 khz) f OSC T a = V R = kω C = 0. µf Supply current I CC (ma) I CC 0 T a = C Ambient temperature T a ( C) Supply voltage (V) I CC T a V S T a Supply current I CC (ma) V CR =. V = V = V =. V Internal reference voltage V S (V) = V = V =. V Ambient temperature T a ( C) Ambient temperature T a ( C)
7 Application Circuit Example The 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.. Ultra low frequency oscillation R L To Each block Mon. Voltage stabilizer V S OSC Stop GND CR C t Oscillation period t 0(S) 0.9R t (Ω) C t (F) put period t (S) t 0.0R t (kω) C t (µf) µf to 0 µf R t VCR Monitor t 0 t t = t 0 t = t 0 = t 0 t ( )
8 ICs for Timer Application Circuit Example (continued). Timer To Each block Mon. Voltage stabilizer V S OSC Stop GND CR C t Timer interval t T = t 0 = 0.9R t (Ω) C t (F).R t (kω) C t (µf) R L µf to 0 µf R t VCR High Low High Low t 0 t T = t 0 t T Note) For AN and AN, above descriptions can be applied to with regard to their same pin functions.
9 Application Circuit Example (continued). Quick check of the operation of the equipment which uses ) to pin 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 at this moment, use a power amplifier 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. V or less. ) Place R TEST in parallel with R t only at the test to lower the resistance, and an oscillation frequency may be high and a timer interval can be shortened. Pulse generator Power amplifier Oscillation waveform of pin. V 0. V R TEST R t 9
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