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HCF4047B Datasheet(PDF) 6 Page - STMicroelectronics |
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HCF4047B Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 12 page  HCF4047B 6/12 DYNAMIC ELECTRICAL CHARACTERISTICS (Tamb = 25°C, CL = 50pF, RL = 200KΩ, tr = tf = 20 ns) (*) Typical temperature coefficient for all VDD value is 0.3 %/°C. APPLICATION INFORMATION 1 - CIRCUIT DESCRIPTION Astable operation is enabled by a high level on the ASTABLE input. The period of the square wave at the Q and Q Outputs in this mode of operation is a function of the external components employed. "True" input pulses on the ASTABLE input or "Complement" pulses on the ASTABLE input allow the circuit to be used as a gatable multivibrator. The OSCILLATOR output period will be half of the Q terminal output in the astable mode. However, a 50% duty cycle is not guaranteed at this output. In the monostable mode, positive-edge triggering is accomplished by application of a leading-edge pulse to the +TRIGGER input and a low level to the -TRIGGER input. For negative-edge triggering, a trailing-edge pulse is applied to the -TRIGGER and a high level is applied to the +TRIGGER. Input pulses may be of any duration relative to the output pulse. The multivibrator can be retriggered (on the leading edge only) by applying a common pulse to both the RETRIGGER and +TRIGGER inputs. In this mode the output pulse remains high as long as the input pulse period is shorter than the period determined by the RC components. An external countdown option can be implemented by Symbol Parameter Test Condition Value (*) Unit VDD (V) Min. Typ. Max. tPLH tPHL Propagation Delay Time Astable, Astable to Osc. Out 5 200 400 ns 10 100 200 15 80 160 Astable, Astable to Q, Q 5 350 700 10 175 350 15 125 250 + or - Trigger to Q, Q 5 500 1000 10 225 450 15 150 300 Retrigger to Q, Q 5 300 600 10 150 300 15 100 200 External Reset to Q, Q 5 250 500 10 100 200 15 70 140 tTHL tTLH Transition Time Osc. Out Q, Q 5 100 200 ns 10 50 100 15 40 80 tW Input Pulse Width + Trigger - Trigger 5 200 400 ns 10 80 160 15 50 100 Reset 5 100 200 10 50 100 15 30 60 Retrigger 5 300 600 10 115 230 15 75 150 tr, tf Input Rise and Fall Time All Inputs 5 Unlimited µs 10 15 Q or Q Deviation from 50% Duty Factor 5 ±0.5 ±1 % 10 ±0.5 ±1 15 ±0.1 ±0.5 |
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