BA225 / BA225F / BA235 / BA226 / BA226F / BA236

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Madison Thomas
6 years ago
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1 timer he BA5, BA5F, BA5, BA6, BA6F, and BA6 are monolithic ICs having independent monostable multivibrator circuits which consume very low current (.75mA typ.). Using external resistors and capacitors, the timing control time can be set within a range from.ms to ms. As the BA5, BA5F, and BA5 are triggered at the rising edge of the signal, they have no trigger input differentiating circuit and can be used in measuring instruments, control devices, digital data systems and other equipment as sub-compact attachments. he BA6, BA6F, and BA6 are available as falling edge trigger types. Applications Delay timers Monostable multivibrator (ideal for V system controllers) Pulse generators Features ) As these are edge trigger types (BA5 / BA5: rising edge trigger types, BA6 / BA6: falling edge trigger types), there is no need for an input differentiating circuit. ) he dual type design enables delay timer configuration. ) Fewer attachments are required. ) Current dissipation is as low as.75ma for each circuit. 5) Uniformity in the supply current between high and low output states simplifies the design of the power supply section. 6) Wide operating power supply voltage range of.v to 6V. 7) he BA5 and BA6 pin assignments are symmetrical, allowing reverse insertion. 8) Hysteresis in the input results in a high level of noise withstand resistance. Block diagram BA5 / BA5F BA6 / BA6F BA5 / BA6 U 8 RIGGER 7 6 U RIGGER U RIGGER RIGGER U

2 Absolute maximum ratings (a = 5 C) Parameter Symbol Limits Unit Power supply voltage 6 V Power dissipation BA5 / BA6 BA5 / BA6 BA5F / BA6F Pd mw mw mw perating temperature opr ~ + 75 C Storage temperature stg 55 ~ + 5 C Reduced by 8mW for each increase in a of C over 5 C. Reduced by 9.5mW for each increase in a of C over 5 C. Reduced by.5mw for each increase in a of C over 5 C. Electrical characteristics (unless otherwise noted, a = 5 C, = 5V) Parameter Symbol Min. yp. Max. Unit Conditions BA6 Measurement circuit perating power supply voltage V Quiescent current IQ.5. ma iming accuracy ERR % R = kω, C =.µf iming change with power supply DS.5. % 5V 6V iming change with temperature ppm / C rigger voltage V V rigger current I 7 µa V =.V (BA5 / BA5) V =.5V (BA6 / BA6F / BA6) utput low level voltage VL.5. V ISINK = 5mA utput high level voltage VH.. V ISURCE = 5mA ne-shot cycle =.5 With input hysteresis (hysteresis width to 6mV) Electrical characteristic curves QUIESCEN CURREN: I (ma) "H" output "L" output 8 6 PWER SUPPLY VLAGE: (V) SAURAIN VLAGE: VH (V) = 5V. 8 6 SURCE CURREN: ISURCE (ma) SAURAIN VLAGE: VL (V). = 5V. 8 6 SINK CURREN: ISINK (ma) Fig. Quiescent current vs. power supply voltage Fig. utput voltage (logic side) characteristics Fig. utput voltage (logic side) characteristics

3 DELAY IME NRMALIZED: td C =.µf R = kω DELAY IME NRMALIZED: td = 5V C =.µf R = kω CAPACIANCE: C (µf)... kω kω MΩ PWER SUPPLY VLAGE: (V) AMBIEN EMPERAURE: a ( C) IMING PERID: (ms) Fig. Power supply voltage vs. delay time Fig. 5 emperature vs. delay time Fig. 6 ne-shot time characteristics Measurement circuit S ma S FF N S IN BA5 BA5F BA5 U D.V µa S PG kω Counter 5mA D.V 5mA.µF Fig. 7 Attached components () iming capacitors (Pins and 6) Connected between these pins and the ground (), this capacitor determines the one-shot period. We recommend using a capacitor with a value greater than pf. he one-shot cycle is determined by = / C R. () iming resistor (Pins and 6) Connected to the power supply line, these resistors determine the one-shot period. he timing capacitor is charged through this resistor. he recommended range for the timing resistor is kω to MΩ. () Power supply capacitor (Pin 8) Connect a.µf capacitor between the power supply pin and the ground () so as to prevent malfunction resulting from a rise in the impedance of the power supply line. () Load (Pins and 7) A load of up to 5mA can be accommodated for both the inflow current and the outflow current.

4 peration notes () Usage range for voltage he recommended voltage range is.v to 6V. Use of these ICs at.v or lower voltage may cause the same mode as the input trigger signal to be output at around.6v. () Input trigger he input trigger level is.v. he LW level is.v or lower and the HIGH level is. V or higher. rigger signals of ms / V or lower should be used for both the rising and falling edges. () ime constant determining C R he recommended value for the timing capacitor is pf or more and that for the timing resistor is from kω to MΩ. he voltage, which is determined by comparison of discharge resistance and the timing resistance in the IC, remains on the pins. If timing resistance is set at 5kΩ or less, this voltage will reach threshold level (. ), and operation will come to a halt. Also, when timing resistance is set to a low value, voltage remains on the pins, which shortens the time constant. If timing resistance is set to MΩ or higher, the IC's internal comparator cannot be driven, which may bring operation to a halt. () Note that pin connections and pin arrangements on the BA5 / BA6 (BA5F / BA6F) differ from those on the BA5 / BA6. Application example Figure 8 shows an example of the circuit including these ICs, while Figure 9 shows the basic operation timing chart. Figure shows the basic operation timing chart of the falling edge trigger type IC. When no trigger signal is applied, the output is in the LW 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. he 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 reaches., the flip-flop in the IC is reset and the output state changes from HIGH to LW. At the same time, the timing capacitor is discharged to be ready for the next operation..µf kω R U R.µF C.µF kω C M. M BA5 BA6 M. M BA5F BA6F U Fig. 8 = 5V

5 Application examples rigger input Rising edge trigger. pin utput ne-shot cycle:.5 Fig. 9 Basic operation timing chart (Rising edge trigger) rigger input Falling edge trigger. pin utput ne-shot cycle:.5 Fig. Basic operation timing chart (Falling edge trigger) 5

6 External dimensions (Units: mm) BA5 / BA6 9. ±. BA5 / BA6. ±.. ±..5Min ± ±. ~ 5. ±..5 ± ±..5 ± ±..8 ± ±. DIP8 SIP9 BA5F / BA6F 5. ± ±..5 ±.. ±..5 ±...7. ±..Min. SP8.5 6

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