BA226F ROHM [Rohm], BA226F Datasheet

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BA226F

Manufacturer Part Number
BA226F
Description
CR timer
Manufacturer
ROHM [Rohm]
Datasheet

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The BA225, BA225F, BA235, BA226, BA226F, and BA236 are monolithic ICs having independent monostable multi-
vibrator circuits which consume very low current (0.75mA typ.). Using external resistors and capacitors, the timing
control time can be set within a range from 0.01ms to 100ms.
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 as
sub-compact attachments. The BA226, BA226F, and BA236 are available as falling edge trigger types.
Delay timers
Monostable multivibrator (ideal for VCR system con-
trollers)
Pulse generators
1) As these are edge trigger types (BA225 / BA235: ris-
2) The dual type design enables delay timer configura-
3) Fewer attachments are required.
4) Current dissipation is as low as 0.75mA for each cir-
Applications
Features
Block diagram
CR timer
BA225 / BA225F / BA235 / BA226 / BA226F / BA236
Standard ICs
BA225 / BA225F
BA226 / BA226F
ing edge trigger types, BA226 / BA236: falling edge
trigger types), there is no need for an input differenti-
ating circuit.
tion.
cuit.
TRIGGER1
OUT1
GND
CR1
1
2
3
4
CR
O
T
O
T
CR
8
7
6
5
V
OUT2
CR2
TRIGGER2
CC
BA235 / BA236
V
CC
1
5) Uniformity in the supply current between high and
6) Wide operating power supply voltage range of 4.0V
7) The BA235 and BA236 pin assignments are sym-
8) Hysteresis in the input results in a high level of noise
2
low output states simplifies the design of the power
supply section.
to 16V.
metrical, allowing reverse insertion.
withstand resistance.
O
CR
3
T
4
GND
5
6
T
CR
7
O
8
V
CC
9
1

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BA226F Summary of contents

Page 1

... CR timer BA225 / BA225F / BA235 / BA226 / BA226F / BA236 The BA225, BA225F, BA235, BA226, BA226F, and BA236 are monolithic ICs having independent monostable multi- vibrator circuits which consume very low current (0.75mA typ.). Using external resistors and capacitors, the timing control time can be set within a range from 0.01ms to 100ms. ...

Page 2

... POWER SUPPLY VOLTAGE: V (V) CC Fig. 1 Quiescent current vs. power supply voltage 2 BA225 / BA225F / BA235 / BA226 / BA226F / BA236 Symbol Limits 800 2 Pd 950 3 450 Topr – Tstg – 125 CC Symbol Min. ...

Page 3

... Timing resistor (Pins 2 and 6) Connected to the power supply line, these resistors determine the one-shot period. The timing capacitor is charged through this resistor. The recommended range for the timing resistor is 10k BA225 / BA225F / BA235 / BA226 / BA226F / BA236 1.020 1.015 1.010 1.005 1 ...

Page 4

... HIGH to LOW. At the same time, the timing capacitor is discharged to be ready for the next operation. 4 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 less, this voltage will reach threshold level (0 ...

Page 5

... Application examples Rising edge trigger Trigger input CR pin T Output Falling edge trigger Trigger input CR pin T Output BA225 / BA225F / BA235 / BA226 / BA226F / BA236 Fig. 9 Basic operation timing chart (Rising edge trigger) Fig. 10 Basic operation timing chart (Falling edge trigger) 0.4V CC One-shot cycle: T 0.5 CR 0.4V CC One-shot cycle ...

Page 6

... Standard ICs • External dimensions (Units: mm) BA225 / BA226 9.3 0 2.54 0.5 0 DIP8 BA225F / BA226F 5.0 0 1.27 0.4 0.1 0.3Min. SOP8 6 BA225 / BA225F / BA235 / BA226 / BA226F / BA236 BA235 / BA236 7.62 0.15 21.8 0.2 2.8 0 0.6 2.54 0.3 0.1 0.8 1.3 SIP9 ...

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