NE555T

更新时间： 2024-02-03 17:12:05

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
7页	124K
描述
IC PULSE; RECTANGULAR, TIMER, MBCY8, Analog Waveform Generation Function

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NE555T 技术参数

是否无铅：	含铅	生命周期：	Obsolete
零件包装代码：	DIE	包装说明：	DIE,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.65
其他特性：	CAN ALSO OPERATE FROM A 15V NOMINAL SUPPLY	模拟集成电路 - 其他类型：	PULSE; RECTANGULAR
JESD-30 代码：	X-XUUC-N	功能数量：	1
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	UNSPECIFIED	封装代码：	DIE
封装形状：	UNSPECIFIED	封装形式：	UNCASED CHIP
认证状态：	Not Qualified	最大供电电压 (Vsup)：	16 V
最小供电电压 (Vsup)：	4.5 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	温度等级：	COMMERCIAL
端子形式：	NO LEAD	端子位置：	UPPER
Base Number Matches：	1

NE555T 数据手册

Philips Semiconductors Linear Products

Product specification

Timer

NE/SA/SE555/SE555C

TYPICAL APPLICATIONS

10k

1/3 V

.001µF

555

VOLTS

DURATION OF

TRIGGER PULSE AS

SEEN BY THE TIMER

SWITCH GROUNDED

AT THIS POINT

NOTE: All resistor values are in Ω

Figure 1. AC Coupling of the Trigger Pulse

Trigger Pulse Width Requirements and Time

Delays

Another consideration is the “turn-off time”. This is the measurement

Due to the nature of the trigger circuitry, the timer will trigger on the

negative going edge of the input pulse. For the device to time out

properly, it is necessary that the trigger voltage level be returned to

some voltage greater than one third of the supply before the time out

period. This can be achieved by making either the trigger pulse

sufficiently short or by AC coupling into the trigger. By AC coupling

the trigger, see Figure 1, a short negative going pulse is achieved

when the trigger signal goes to ground. AC coupling is most

frequently used in conjunction with a switch or a signal that goes to

ground which initiates the timing cycle. Should the trigger be held

low, without AC coupling, for a longer duration than the timing cycle

the output will remain in a high state for the duration of the low

trigger signal, without regard to the threshold comparator state. This

is due to the predominance of Q on the base of Q , controlling

of the amount of time required after the threshold reaches 2/3 V

to turn the output low. To explain further, Q at the threshold input

turns on after reaching 2/3 V , which then turns on Q , which turns

on Q . Current from Q turns on Q which turns Q off. This

allows current from Q to turn on Q and Q to given an output

low. These steps cause the 2µs max. delay as stated in the data

sheet.

Also, a delay comparable to the turn-off time is the trigger release

time. When the trigger is low, Q is on and turns on Q which turns

on Q . Q turns off Q and allows Q to turn on. This turns off

current to Q and Q , which results in output high. When the

trigger is released, Q and Q shut off, Q turns off, Q turns on

and the circuit then follows the same path and time delay explained

as “turn off time”. This trigger release time is very important in

designing the trigger pulse width so as not to interfere with the

output signal as explained previously.

the state of the bi-stable flip-flop. When the trigger signal then

returns to a high level, the output will fall immediately. Thus, the

output signal will follow the trigger signal in this case.

352

August 31, 1994

1...4 5 67

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