参数资料
| 型号： | NCV1455BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC OSC MONO TIMING 8SOIC |
| 标准包装： | 1 |
| 类型： | 555 型，计时器/振荡器（单路） |
| 电源电压： | 4.5 V ~ 16 V |
| 电流 - 电源： | 10mA |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOICN |
| 安装类型： | 表面贴装 |
| 其它名称： | NCV1455BDR2GOSDKR |
MC1455, MC1455B, NCV1455B
http://onsemi.com
7
APPLICATIONS INFORMATION
Linear Voltage Ramp
In the monostable mode, the resistor can be replaced by a
constant current source to provide a linear ramp voltage. The
capacitor still charges from 0 VCC to 2/3 VCC. The linear
ramp time is given by:
t = 2
3
VCC
1
, where I =
VCC VB VBE
RE
If VB is much larger than VBE, then t can be made
independent of VCC.
Missing Pulse Detector
The timer can be used to produce an output when an input
pulse fails to occur within the delay of the timer. To
accomplish this, set the time delay to be slightly longer than
the time between successive input pulses. The timing cycle
is then continuously reset by the input pulse train until a
change in frequency or a missing pulse allows completion of
the timing cycle, causing a change in the output level.
Figure 20. Linear Voltage Sweep Circuit
Figure 21. Missing Pulse Detector
Figure 22. Linear Voltage Ramp Waveforms
Figure 23. Missing Pulse Detector Waveforms
Discharge
Threshold
VCC
Reset
4
3
Digital
Output
2
Trigger
1
MC1455
8VCC
RE
R1
2N4403
or Equiv
VB
R2
C
7
6
5
Sweep
Output
0.01
mF
Control
Voltage
+VCC (5.0 V to 15 V)
Reset
RL
VCC
RA
7
6
5
Control
Voltage
0.01
mF
1
Trigger
Input
Output
48
C
2N4403
or Equiv
MC1455
t = 100
ms/cm
VE
3
2
t = 500
ms/cm
(RE = 10 kW, R2 = 100 kW, R1 = 39 kW, C = 0.01 mF, VCC = 15 V)
(RA = 2.0 kW, RL = 1.0 kW, C = 0.01 mF, VCC = 15 V)
I
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