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BA225 Datasheet(PDF) 4 Page - Rohm |
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BA225 Datasheet(HTML) 4 Page - Rohm |
4 / 6 page 4 Standard ICs BA225 / BA225F / BA235 / BA226 / BA226F / BA236 •Operation notes (1) Usage range for voltage The recommended voltage range is 4.0V to 16V. Use of these ICs at 3.0V or lower voltage may cause the same mode as the input trigger signal to be output at around 2.6V. (2) Input trigger The input trigger level is 2.0V. The LOW level is 1.0V or lower and the HIGH level is 3.0 V or higher. Trigger signals of 10ms / V or lower should be used for both the rising and falling edges. (3) Time constant determining C • R The recommended value for the timing capacitor is 1000pF or more and that for the timing resistor is from 10k Ω to 1MΩ. The voltage, which is determined by comparison of dis- charge resistance and the timing resistance in the IC, remains on the CR pins. If timing resistance is set at 5k Ω or less, this voltage will reach threshold level (0.4 × VCC), and operation will come to a halt. Also, when timing resistance is set to a low value, voltage remains on the CR pins, which shortens the time constant. If timing resistance is set to 2M Ω or higher, the IC's inter- nal comparator cannot be driven, which may bring operation to a halt. (4) Note that pin connections and pin arrangements on the BA225 / BA226 (BA235F / BA226F) differ from those on the BA235 / BA236. •Application example Figure 8 shows an example of the circuit including these ICs, while Figure 9 shows the basic operation timing chart. Figure 10 shows the basic operation tim- ing chart of the falling edge trigger type IC. When no trigger signal is applied, the output is in the LOW state and the timing capacitor is in the discharged state. When a trigger signal is applied, its rising edge causes the output to become HIGH and the timing capacitor to be charged. The charging time of this timing capacitor is determined by the time constants of the external timing resistor and the timing capacitor. When the charged voltage reach- es 0.4 × VCC, the flip-flop in the IC is reset and the out- put state changes from HIGH to LOW. At the same time, the timing capacitor is discharged to be ready for the next operation. CR M. M2 0T CR GND BA225 BA226 BA225F BA226F VCC VCC 12 3 4 0.1 µF C VCC = 5V R 100k Ω C 8 765 0.02 µF VCC OUT2 OUT1 100k Ω R M. M1 0T Fig. 8 |
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