BA236 データシートの表示（PDF） - ROHM Semiconductor

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BA236

(BA2xx) CR Timer

ROHM Semiconductor 

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

10kΩ 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

5kΩ 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 2MΩ 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.

VCC

0.02µF

OUT2

R 100kΩ

C

8

7

6

5

VCC

CR

0

T

M. M2

M. M1

0

T

CR

BA225

BA226

BA225F

BA226F

GND

1

2

3

4

OUT1

100kΩ

R

0.1µF

C

VCC

Fig. 8

VCC = 5V

4

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