BA235资料

As the BA225, BA225F, and BA235 are triggered at the rising edge of the signal, they have no trigger input differenti-ating circuit and can be used in measuring instruments, control devices, digital data systems and other equipment assub-compact attachments. The BA226, BA226F, and BA236 are available as falling edge trigger types.Applications•Delay timers

Monostable multivibrator (ideal for VCR system con-trollers)

Pulse generators

Features•1)As these are edge trigger types (BA225 / BA235: ris-ing edge trigger types, BA226 / BA236: falling edgetrigger types), there is no need for an input differenti-ating circuit.

2)The dual type design enables delay timer configura-tion.

3)Fewer attachments are required.

4)Current dissipation is as low as 0.75mA for each cir-cuit.

5)Uniformity in the supply current between high andlow output states simplifies the design of the powersupply section.

6)Wide operating power supply voltage range of 4.0Vto 16V.

7)The BA235 and BA236 pin assignments are sym-metrical, allowing reverse insertion.

8)Hysteresis in the input results in a high level of noisewithstand resistance.

•Block diagram

BA225 / BA225FBA226 / BA226FBA235 / BA236OUT11O8VCCCR12CROT7OUT2OCRTGNDTCROTRIGGER13CRT6CR2VCC1VCC2OUT13CR14TRIGGER1VCC5GND6TRIGGER27CR28OUT29VCCGND45TRIGGER21

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Standard ICs

BA225 / BA225F / BA235 / BA226 / BA226F / BA236

•Absolute maximum ratings (Ta = 25°C)

Parameter

Power supply voltage

BA225 / BA226

Power dissipation

BA235 / BA236BA225F / BA226F

Operating temperature Storage temperature

ToprTstgPdSymbolVCC

Limits16800∗1950∗2450∗3– 20 ~ + 75– 55 ~ + 125

UnitVmWmWmW°C°C

∗1 Reduced by 8mW for each increase in Ta of 1°C over 25°C.∗2 Reduced by 9.5mW for each increase in Ta of 1°C over 25°C.∗3 Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.

•Electrical characteristics (unless otherwise noted, Ta = 25°C, V

Parameter

Operating power supply voltage Quiescent current Timing accuracy

Timing change with power supply Timing change with temperatureTrigger voltage

SymbolMin.VCCIQTERRTDSTOTVT

4.0————1.00.7——3.0

Typ.Max.5.01.510.52002.01.6700.54.0

16.03.0103.0—3.02.52001.0—

CC

= 5V)

Conditions

——

R = 100kΩ, C = 0.1µF∗15V¨16V

—

∗2

UnitVmA%%ppm / °C

V

MeasurementcircuitFig.7Fig.7Fig.7Fig.7Fig.7Fig.7

BA236

Trigger currentOutput low level voltageOutput high level voltage

ITVOLVOH

µAVV

VT = 3.0V (BA225 / BA235)

VT = 2.5V (BA226 / BA226F / BA236)ISINK = 5mA ISOURCE = 5mA

Fig.7Fig.7Fig.7

∗1 One-shot cycle T = 0.5 CR

∗2 With input hysteresis (hysteresis width Լ 200 to 600mV)

•Electrical characteristic curves

SATURATION VOLTAGE: VCC—VOH (V)VCC = 5V

3.22.82.42.01.61.20.80.400

4

8

12

16

20

SATURATION VOLTAGE: VOL (V)QUIESCENT CURRENT: IO (mA)43\"H\" output2\"L\" output2.0

VCC = 5V

1.0

1004812162000

48121620

POWER SUPPLY VOLTAGE: VCC (V)SOURCE CURRENT: ISOURCE (mA)SINK CURRENT: ISINK (mA)

Fig. 1 Quiescent current vs. power supply voltage

Fig. 2 Output voltage (logic 1 side) characteristicsFig. 3 Output voltage (logic 0

side) characteristics

2

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Standard ICs

BA225 / BA225F / BA235 / BA226 / BA226F / BA236

C = 0.01µFR = 100kΩ

DELAY TIME NORMALIZED: tdDELAY TIME NORMALIZED: td1.0201.0151.0101.0051.0000.9950.9900.9850.980

VCC = 5VC = 0.01µFR = 100kΩ

CAPACITANCE: C (µF)101.0101.0051.0000.9950.9900.9850.9800

0481216201.010kΩ0.1100kΩ0.01– 250255075

0.0010.010.111MΩ10100POWER SUPPLY VOLTAGE: VCC (V)AMBIENT TEMPERATURE: Ta (°C)TIMING PERIOD: T (ms)

Fig. 4 Power supply voltage vs.

delay timeFig. 5 Temperature vs.

delay timeFig. 6 One-shot time characteristics

•Measurement circuit

S1OFFS0mAONVCC

VCCS2IND.VµAPG100kΩBA225BA225FBA235CRGNDOUTS3Counter5mA5mAD.V0.1µFFig. 7

Attached components•(1) Timing capacitors (Pins 2 and 6)

Connected between these pins and the ground (GND),this capacitor determines the one-shot period. We rec-ommend using a capacitor with a value greater than1000pF. The one-shot cycle is determined by T = 1 / 2C • R.

(2) Timing resistor (Pins 2 and 6)

Connected to the power supply line, these resistorsdetermine the one-shot period. The timing capacitor ischarged through this resistor. The recommended rangefor the timing resistor is 10kΩto 1MΩ.

(3) Power supply capacitor (Pin 8)

Connect a 0.02µF capacitor between the power supplypin and the ground (GND) so as to prevent malfunctionresulting from a rise in the impedance of the powersupply line.

(4) Load (Pins 1 and 7)

A load of up to 5mA can be accommodated for both theinflow current and the outflow current.

3

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Standard ICs

Operation notes•(1) Usage range for voltage

BA225 / BA225F / BA235 / BA226 / BA226F / BA236

The recommended voltage range is 4.0V to 16V. Useof these ICs at 3.0V or lower voltage may cause thesame mode as the input trigger signal to be output ataround 2.6V.(2) Input trigger

The input trigger level is 2.0V. The LOW level is 1.0Vor lower and the HIGH level is 3.0 V or higher. Triggersignals of 10ms / V or lower should be used for boththe rising and falling edges.

(3) Time constant determining C • R

The recommended value for the timing capacitor is1000pF or more and that for the timing resistor is from10kΩto 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 at5kΩor less, this voltage will reach threshold level (0.4×VCC), and operation will come to a halt. Also, whentiming resistance is set to a low value, voltage remainson the CR pins, which shortens the time constant. Iftiming resistance is set to 2MΩor higher, the IC's inter-nal comparator cannot be driven, which may bringoperation to a halt.

(4) Note that pin connections and pin arrangements onthe BA225 / BA226 (BA235F / BA226F) differ fromthose on the BA235 / BA236.

Application example•Figure 8 shows an example of the circuit includingthese ICs, while Figure 9 shows the basic operationtiming chart. Figure 10 shows the basic operation tim-ing chart of the falling edge trigger type IC. When notrigger signal is applied, the output is in the LOW stateand the timing capacitor is in the discharged state.When a trigger signal is applied, its rising edge causesthe output to become HIGH and the timing capacitor tobe charged.

The charging time of this timing capacitor is determinedby the time constants of the external timing resistor andthe 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 sametime, the timing capacitor is discharged to be ready forthe next operation.

VCCROUT20.02µF8VCCCR0M. M2T76100kΩ0.1µFC5VCC = 5VM. M10CR1OUT1100kΩ RVCC0.1µF C23TBA225BA226BA225FBA226FGND4Fig. 84

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Standard ICs

BA225 / BA225F / BA235 / BA226 / BA226F / BA236

•Application examples

Rising edge triggerTrigger input

0.4VCCCR pin

TOutput

One-shot cycle: T Լ 0.5 CR

Fig. 9 Basic operation timing chart

(Rising edge trigger)

Falling edge triggerTrigger input

0.4VCCCR pin

TOutput

One-shot cycle: T Լ 0.5 CR

Fig. 10 Basic operation timing chart

(Falling edge trigger)

5

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Standard ICs

BA225 / BA225F / BA235 / BA226 / BA226F / BA236

•External dimensions (Units: mm)

BA225 / BA2269.3 ± 0.36.5 ± 0.38521.8 ± 0.22.8 ± 0.2BA235 / BA23610.5 ± 0.55.8 ± 0.210.51Min.47.623.2 ± 0.23.4 ± 0.31.2192.543.5 ± 0.50.60.81.30.3 ± 0.10.3 ± 0.12.540.5 ± 0.10° ~ 15°DIP8BA225F / BA226F5.0 ± 0.286.2 ± 0.34.4 ± 0.25SIP91.5 ± 0.1140.111.270.4 ± 0.10.3Min.0.15SOP86

0.15 ± 0.1