Datasheet > LMC555CBP/NOPB

LMC555CBP/NOPB

更新时间： 2024-02-13 22:34:38

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
19页	949K
描述
PULSE; RECTANGULAR, 3MHz, TIMER, PBGA8, ROHS COMPLIANT, MO-211BC, SMD-8

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LMC555CBP/NOPB 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	FBGA,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.67	模拟集成电路 - 其他类型：	PULSE; RECTANGULAR
JESD-30 代码：	R-PBGA-B8	长度：	1.412 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出频率：	3 GHz
封装主体材料：	PLASTIC/EPOXY	封装代码：	FBGA
封装形状：	RECTANGULAR	封装形式：	GRID ARRAY, FINE PITCH
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
最大供电电压 (Vsup)：	12 V	最小供电电压 (Vsup)：	1.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子形式：	BALL	端子节距：	0.5 mm
端子位置：	BOTTOM	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	1.387 mm	Base Number Matches：	1

LMC555CBP/NOPB 数据手册

negative pulse to the reset terminal. The output will then

remain in the low state until a trigger pulse is again applied.

Application Information

When the reset function is not use, it is recommended that it

be connected to V₊to avoid any possibility of false triggering.

Figure 3 is a nomograph for easy determination of RC values

for various time delays.

MONOSTABLE OPERATION

In this mode of operation, the timer functions as a one-shot

(Figure 1). The external capacitor is initially held discharged

by internal circuitry. Upon application of a negative trigger

pulse of less than 1/3 V_Sto the Trigger terminal, the flip-flop

is set which both releases the short circuit across the capaci-

tor and drives the output high.

Note: In monstable operation, the trigger should be driven high before the

end of timing cycle.

00866911

00866904

FIGURE 3. Time Delay

FIGURE 1. Monostable (One-Shot)

The voltage across the capacitor then increases exponen-

tially for a period of t_H= 1.1 R_AC, which is also the time that

the output stays high, at the end of which time the voltage

equals 2/3 V_S. The comparator then resets the flip-flop which

in turn discharges the capacitor and drives the output to its

low state. Figure 2 shows the waveforms generated in this

mode of operation. Since the charge and the threshold level

of the comparator are both directly proportional to supply

voltage, the timing internal is independent of supply.

ASTABLE OPERATION

If the circuit is connected as shown in Figure 4 (Trigger and

Threshold terminals connected together) it will trigger itself

and free run as a multivibrator. The external capacitor

charges through R_A+ R_Band discharges through R_B. Thus

the duty cycle may be precisely set by the ratio of these two

resistors.

00866910

= 5V

Top Trace: Input 5 V/Div.

00866905

TIME = 0.1 ms/Div. Middle Trace: Output 5 V/Div.

= 9.1 kΩ

Bottom Trace: Capacitor Voltage 2 V/Div.

FIGURE 4. Astable (Variable Duty Cycle Oscillator)

C = 0.01 µF

In this mode of operation, the capacitor charges and dis-

charges between 1/3 V_Sand 2/3 V_S. As in the triggered

mode, the charge and discharge times, and therefore the

frequency are independent of the supply voltage.

FIGURE 2. Monostable Waveforms

Reset overrides Trigger, which can override threshold.

Therefore the trigger pulse must be shorter than the desired

t_H. The minimum pulse width for the Trigger is 20ns, and it is

400ns for the Reset. During the timing cycle when the output

is high, the further application of a trigger pulse will not effect

the circuit so long as the trigger input is returned high at least

10µs before the end of the timing interval. However the

circuit can be reset during this time by the application of a

Figure 5 shows the waveform generated in this mode of

operation.

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LMC555CBPX/NOPB	TI	PULSE; RECTANGULAR, 3MHz, TIMER, PBGA8, ROHS COMPLIANT, MO-211BC, SMD-8	获取价格
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