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HCF4047B Datasheet(PDF) 7 Page - STMicroelectronics |
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HCF4047B Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 12 page  HCF4047B 7/12 coupling "Q" to an external "N" counter and resetting the counter with the trigger pulse. The counter output pulse is fed back to the ASTABLE input and has a duration equal to N times the period of the multivibrator. A high level on the EXTERNAL RESET input assures no output pulse during an "ON" power condition. This input can also be activated to terminate the output pulse at any time. In the monostable mode, a high-level or power-on reset pulse, must be applied to the EXTERNAL RESET whenever VDD is applied. 2 - ASTABLE MODE The following analysis presents worst-case variations from unit-to-unit as a function of transfer-voltage (VTR) shift (33% - 67% VDD) for free-running (astable) operation. ASTABLE MODE WAVEFORMS Typ : VTR = 0.5 VDD tA = 4.40 RC Min : VTR = 0.33 VDD tA = 4.62 RC Max : VTR = 0.67 VDD tA = 4.62 RC thus if tA = 4.40 RC is used, the maximum variation will be (+ 5.0%, -0.0%) In addition to variations from unit-to-unit, the astable period may vary as a function of frequency with respect to VDD and temperature. 3 - MONOSTABLE MODE The following analysis presents worst-case variations from unit-to-unit as a function of transfer-voltage (VTR) shift (33% - 67% VDD) for one-shot (monostable) operation. MONOSTABLE WAVEFORMS VTR t1 = -RC In ————— VDD + VTR VDD - VTR t2 = -RC In ————— 2VDD - VTR (VTR)(VDD - VTR) t3 = 2(t1+t2)= -2RC In ——————————— (VDD + VTR)(2VDD - VTR) VTR t1 = -RC In ——— 2VDD VDD - VTR t2 = -RC In ————— 2VDD - VTR (VTR)(VDD - VTR) tM = (t1+t2)= -RC In ————————— (2VDD - VTR)(2VDD) |
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