MC3456D

更新时间： 2024-02-12 17:15:42

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		模拟波形发生功能信号电路光电二极管
页数	文件大小	规格书
10页	204K
描述
DUAL PULSE; RECTANGULAR, TIMER, PDSO14, PLASTIC, SO-14

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技术参数
数据手册

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MC3456D 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP14,.3	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDIP-T14
JESD-609代码：	e0	端子数量：	14
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP14,.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	Base Number Matches：	1

MC3456D 数据手册

MC3456

Figure 13. 1/2 Representative Circuit Schematic

Control Voltage

Threshold

Comparator

Trigger

Comparator

Flip–Flop

Output

4.7 k

830

4.7 k

1.0 k

6.8 k

5.0 k

Threshold

7.0 k

4.7 k

3.9 k

Output

10 k

c b

5.0 k

Trigger

Reset

220

Reset

4.7 k

100 k

Discharge

Gnd

Discharge

100

GENERAL OPERATION

The MC3456 is a dual timing circuit which uses as its

timing elements an external resistor/capacitor network. It can

be used in both the monostable (one shot) and astable

modes with frequency and duty cycle, controlled by the

capacitor and resistor values. While the timing is dependent

upon the external passive components, the monolithic circuit

provides the starting circuit, voltage comparison and other

functions needed for a complete timing circuit. Internal to the

integrated circuit are two comparators, one for the input

signal and the other for capacitor voltage; also a flip–flop and

digital output are included. The comparator reference

voltages are always a fixed ratio of the supply voltage thus

providing output timing independent of supply voltage.

that the output is high is given by the equation t = 1.1 R C.

Various combinations of R and C and their associated times

are shown in Figure 14. The trigger pulse width must be less

than the timing period.

A reset pin is provided to discharge the capacitor thus

interrupting the timing cycle. As long as the reset pin is low,

the capacitor discharge transistor is turned “on” and prevents

the capacitor from charging. While the reset voltage is

applied the digital output will remain the same. The reset pin

should be tied to the supply voltage when not in use.

Figure 14. Time Delay

100

Monostable Mode

In the monostable mode, a capacitor and a single resistor

are used for the timing network. Both the threshold terminal

and the discharge transistor terminal are connected together

in this mode (refer to circuit Figure 15). When the input

1.0

voltage to the trigger comparator falls below 1/3 V

the

comparator output triggers the flip–flop so that it’s output sets

low. This turns the capacitor discharge transistor “off” and

drives the digital output to the high state. This condition

allows the capacitor to charge at an exponential rate which is

set by the RC time constant. When the capacitor voltage

0.1

0.01

reaches 2/3 V

the threshold comparator resets the

0.001

flip–flop. This action discharges the timing capacitor and

returns the digital output to the low state. Once the flip–flop

has been triggered by an input signal, it cannot be retriggered

until the present timing period has been completed. The time

µs

100

µs

1.0 ms 10 ms

100 ms

1.0

100

t , TIME DELAY (s)

MOTOROLA ANALOG IC DEVICE DATA

1 2 3 456 7 8...10

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与MC3456D相关器件

型号	品牌	描述	获取价格	数据表
MC3456DR2	MOTOROLA	2 Func, BIPolar, PDSO14, PLASTIC, SO-14	获取价格
MC3456L	MOTOROLA	Analog Waveform Generation Function, BIPolar, CDIP14	获取价格
MC3456LD	MOTOROLA	Analog Waveform Generation Function, BIPolar, CDIP14	获取价格
MC3456LDS	MOTOROLA	IC,TIMER,BIPOLAR,DIP,14PIN,CERAMIC	获取价格
MC3456LS	MOTOROLA	Analog Waveform Generation Function, BIPolar, CDIP14	获取价格
MC3456P	MOTOROLA	DUAL TIMING CIRCUIT	获取价格

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