BA226F ROHM [Rohm], BA226F Datasheet - Page 4

• Manufacturer Part Number: BA226F
• Description: CR timer
• Manufacturer: ROHM [Rohm]

•
(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 to 1M .
•
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
put state changes from HIGH to LOW. At the same
time, the timing capacitor is discharged to be ready for
the next operation.
4
Standard ICs
Operation notes
Application example
V
CC
, the flip-flop in the IC is reset and the out-
BA225 / BA225F / BA235 / BA226 / BA226F / BA236
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
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
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.
V
CC
or less, this voltage will reach threshold level (0.4
0.02 F
OUT1
), and operation will come to a halt. Also, when
8
1
100k
V
V
CC
CC
R
0
V
CC
M. M1
7
2
OUT2
CR
0.1 F
0
C
T
M. M2
R
6
3
CR
Fig. 8
BA225
BA226
BA225F
BA226F
100k
C
T
5
4
GND
or higher, the IC's inter-
V
CC
= 5V