MC1455

更新时间： 2024-02-18 03:54:21

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
10页	151K
描述
Timing Circuit

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技术参数
数据手册

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MC1455 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP8,.3	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-XDIP-T8
JESD-609代码：	e0	端子数量：	8
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	CERAMIC	封装代码：	DIP
封装等效代码：	DIP8,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	5/15 V
认证状态：	Not Qualified	子类别：	Analog Waveform Generation Functions
表面贴装：	NO	技术：	BIPOLAR
温度等级：	COMMERCIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL

MC1455 数据手册

MC1455, MC1455B, NCV1455B

100

1.0

0.1

0.01

0.001

t = 50 ms/cm

(R = 10 kW, C = 0.01 mF, R = 1.0 kW, V = 15 V)

10 ms 100 ms 1.0 ms 10 ms 100 ms

1.0

100

t , TIME DELAY (s)

Figure 15. Monostable Waveforms

Figure 16. Time Delay

+V (5.0 V to 15 V)

Reset

Output

7ꢁDischarge

6ꢁThreshold

Trigger

MC1455

Control

Voltage

t = 20 ms/cm

(R = 5.1 kW, C = 0.01 mF, R = 1.0 kW; R = 3.9 kW, V = 15 V)

Figure 17. Astable Circuit

Figure 18. Astable Waveforms

Astable Mode

In the astable mode the timer is connected so that it will

retrigger itself and cause the capacitor voltage to oscillate

To obtain the maximum duty cycle R 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).

between 1/3 V and 2/3 V . See Figure 17.

The external capacitor changes to 2/3 V through R and

R and discharges to 1/3 V through R . By varying the

The minimum value of R is given by:

ratio of these resistors the duty cycle can be varied. The

charge and discharge times are independent of the supply

voltage.

(Vdc)

0.2

I7 (A)

100

The charge time (output high) is given by:

+ 0.695(R ) R )C

A B

The discharge time (output low) is given by:

+ 0.695(R )C

1.0

0.1

Thus the total period is given by:

T + t ) t + 0.695(R ) 2R )C

1.44

(R ) 2R )C

0.01

The frequency of oscillation is then:

f +

(R + 2 R )

A B

0.001

and may be easily found as shown in Figure 19.

0.1

1.0

100

1.0 k

f, FREE RUNNING FREQUENCY (Hz)

10 k

100

The duty cycle is given by:

DC +

) 2R

Figure 19. Free Running Frequency

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