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參數(shù)資料
| 型號： | NCV1455BDR2 |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 0K |
| 描述： | IC OSC MONO TIMING 8SOIC |
| 產(chǎn)品變化通告： | Product Obsolescence 11/Feb/2009 |
| 標準包裝： | 2,500 |
| 類型： | 555 型，計時器/振蕩器（單路） |
| 電源電壓： | 4.5 V ~ 16 V |
| 電流 - 電源： | 10mA |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 帶卷 (TR) |
| 供應商設備封裝： | 8-SOICN |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | NCV1455BDR2OS |
MC1455, MC1455B, NCV1455B
http://onsemi.com
6
C,
CAP
ACIT
ANCE
(
F) μ
Figure 15. Monostable Waveforms
Figure 16. Time Delay
Figure 17. Astable Circuit
Figure 18. Astable Waveforms
(RA = 10 kW, C = 0.01 mF, RL = 1.0 kW, VCC = 15 V)
(RA = 5.1 kW, C = 0.01 mF, RL = 1.0 kW; RB = 3.9 kW, VCC = 15 V)
t = 20
ms/cm
t = 50
ms/cm
100
10
1.0
0.1
0.01
0.001
10
ms 100 ms 1.0 ms 10 ms
100 ms
1.0
10
100
td, TIME DELAY (s)
RL
+VCC (5.0 V to 15 V)
Reset
VCC
8
7Discharge
6Threshold
5
Control
Voltage
1
2
Trigger
Output
3
4
RA
RL
MC1455
C
RB
Astable Mode
In the astable mode the timer is connected so that it will
retrigger itself and cause the capacitor voltage to oscillate
between 1/3 VCC and 2/3 VCC. See Figure 17.
The external capacitor changes to 2/3 VCC through RA and
RB and discharges to 1/3 VCC through RB. By varying the
ratio of these resistors the duty cycle can be varied. The
charge and discharge times are independent of the supply
voltage.
The charge time (output high) is given by:
t1 + 0.695(RA ) RB)C
The discharge time (output low) is given by:
t2 + 0.695(RB)C
Thus the total period is given by:
T + t1 ) t2 + 0.695(RA ) 2RB)C
The frequency of oscillation is then:
f +
1
1 +
1.44
(RA ) 2RB)C
and may be easily found as shown in Figure 19.
The duty cycle is given by:
DC +
RB
RA ) 2RB
To obtain the maximum duty cycle RA must be as small as
possible; but it must also be large enough to limit the
discharge current (Pin 7 current) within the maximum rating
of the discharge transistor (200 mA).
The minimum value of RA is given by:
RA w
VCC(Vdc)
I7 (A)
w
VCC(Vdc)
0.2
Figure 19. Free Running Frequency
C,
CAP
ACIT
ANCE
(
F) μ
100
10
1.0
0.1
0.01
0.001
(RA + 2 RB)
0.1
1.0
10
100
1.0 k
10 k
100
f, FREE RUNNING FREQUENCY (Hz)
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