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MC14538BDW PDF预览

MC14538BDW

更新时间： 2024-02-03 04:58:46
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 振荡器
页数 文件大小 规格书
10页 275K
描述
Dual Precision Retriggerable/Resettable Monostable Multivibrator

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MC14538BDW 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP, SOP16,.3针数：16
Reach Compliance Code：compliantHTS代码：8542.39.00.01
Factory Lead Time：1 week风险等级：8.16
系列：4000/14000/40000JESD-30 代码：R-PDSO-G16
JESD-609代码：e4长度：10.2 mm
逻辑集成电路类型：MONOSTABLE MULTIVIBRATOR湿度敏感等级：3
数据/时钟输入次数：2功能数量：2
端子数量：16最高工作温度：125 °C
最低工作温度：-55 °C输出极性：COMPLEMENTARY
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP16,.3封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：260
电源：5/15 V传播延迟（tpd）：600 ns
认证状态：Not Qualified座面最大高度：2.05 mm
子类别：Prescaler/Multivibrators最大供电电压 (Vsup)：18 V
最小供电电压 (Vsup)：3 V标称供电电压 (Vsup)：5 V
表面贴装：YES技术：CMOS
温度等级：MILITARY端子面层：Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：5.275 mmBase Number Matches：1

MC14538BDW 数据手册

 浏览型号MC14538BDW的Datasheet PDF文件第4页浏览型号MC14538BDW的Datasheet PDF文件第5页浏览型号MC14538BDW的Datasheet PDF文件第6页浏览型号MC14538BDW的Datasheet PDF文件第8页浏览型号MC14538BDW的Datasheet PDF文件第9页浏览型号MC14538BDW的Datasheet PDF文件第10页 
RETRIGGER OPERATION  
change. Since the Q output is reset when an input low level is  
detected on the Reset input, the output pulse T can be made  
significantly shorter than the minimum pulse width specifi-  
cation.  
The MC14538B is retriggered if a valid trigger occurs ➂ fol-  
lowed by another valid trigger ➃ before the Q output has  
returned to the quiescent (zero) state. Any retrigger, after the  
timing node voltage at pin 2 or 14 has begun to rise from  
POWER–DOWN CONSIDERATIONS  
V , but has not yet reached V , will cause an increase  
ref 1 ref 2  
in output pulse width T. When a valid retrigger is initiated ➃,  
the voltage at C /R will again drop to V before  
progressing along the RC charging curve toward V . The Q  
DD  
output will remain high until time T, after the last valid retrig-  
ger.  
Large capacitance values can cause problems due to the  
large amount of energy stored. When a system containing  
the MC14538B is powered down, the capacitor voltage may  
X
X
ref 1  
discharge from V  
at pin 2 or 14. Current through the protection diodes should  
be limited to 10 mA and therefore the discharge time of the  
through the standard protection diodes  
DD  
RESET OPERATION  
V
supply must not be faster than (V  
). (C)/(10 mA). For  
DD  
example, if V  
DD  
= 10 V and C = 10 µF, the V supply  
DD  
The MC14538B may be reset during the generation of the  
output pulse. In the reset mode of operation, an input pulse  
on Reset sets the reset latch and causes the capacitor to be  
DD  
X
should discharge no faster than (10 V) x (10 µF)/(10 mA) =  
10 ms. This is normally not a problem since power supplies  
are heavily filtered and cannot discharge at this rate.  
fast charged to V  
by turning on transistor P1 ➄. When the  
DD  
voltage on the capacitor reaches V  
, the reset latch will  
ref 2  
When a more rapid decrease of V  
to zero volts occurs,  
DD  
the MC14538B can sustain damage. To avoid this possibility  
clear, and will then be ready to accept another pulse. It the  
Reset input is held low, any trigger inputs that occur will be  
inhibited and the Q and Q outputs of the output latch will not  
use an external clamping diode, D , connected as shown in  
X
Fig. 11.  
D
x
PIN ASSIGNMENT  
C
V
V
x
DD  
R
x
V
1
2
16  
15  
V
SS  
DD  
V
SS  
C
/R  
A
V
X
X
SS  
DD  
RESET A  
3
4
5
6
7
8
14  
13  
12  
11  
10  
9
C /R B  
X X  
A
A
RESET B  
Q
Q
B
Q
Q
A
B
A
A
A
B
B
RESET  
Q
B
B
V
Q
SS  
Figure 11. Use of a Diode to Limit  
Power Down Current Surge  
MOTOROLA CMOS LOGIC DATA  
MC14538B  
7
1...45678910

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