ICM7555

更新时间： 2024-01-09 00:49:00

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
9页	109K
描述
General purpose CMOS timer

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技术参数
数据手册

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ICM7555 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	, CAN8,.2	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	O-MBCY-W8
JESD-609代码：	e0	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	METAL	封装等效代码：	CAN8,.2
封装形状：	ROUND	封装形式：	CYLINDRICAL
电源：	5 V	认证状态：	Not Qualified
筛选级别：	MIL-STD-883 Class C	子类别：	Analog Waveform Generation Functions
标称供电电压 (Vsup)：	5 V	技术：	CMOS
温度等级：	MILITARY	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	WIRE	端子位置：	BOTTOM
Base Number Matches：	1

ICM7555 数据手册

Philips Semiconductors Linear Products

Product specification

General purpose CMOS timer

ICM7555

improved over the standard bipolar 555 in that it controls only the

internal flip-flop, which in turn controls simultaneously the state of

the OUTPUT and DISCHARGE pins. This avoids the multiple

threshold problems sometimes encountered with slow falling edges

in the bipolar devices.

Astable Operation

If the circuit is connected as shown in Figure 2, it will trigger itself

and free run as a multivibrator. The external capacitor charges

through R and R and discharges through R only. Thus, the duty

cycle (D) may be precisely set by the ratio of these two resistors. In

this mode of operation, the capacitor charges and discharges

between 1/3 V and 2/3 V . Since the charge rate and the

threshold levels are directly proportional to the supply voltage, the

frequency of oscillation is independent of the supply voltage.

GND

DISHCARGE

THRESHOLD

TRIGGER

OUTPUT

RESET

+ R

1.38

(R + 2R )

F =

D =

OUTPUT

R + 2R

A B

CONTROL

VOLTAGE

Monostable Operation

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

the external capacitor (C) is held discharged by a transistor inside

the timer. Upon application of a negative pulse to Pin 2,TRIGGER,

the internal flip-flop is set which releases the low impedance on

DISCHARGE; the external capacitor charges and drives the

OUTPUT High. The voltage across the capacitor increases

exponentially with a time constant t = R C. When the voltage

across the capacitor equals 2/3 V , the comparator resets the

Figure 2. Astable Operation

flip-flop, which in turn discharges the capacitor rapidly and also

drives the OUTPUT to its low state. TRIGGER must return to a high

state before the OUTPUT can return to a low state.

Control Voltage

The CONTROL VOLTAGE terminal permits the two trip voltages for

the THRESHOLD and TRIGGER internal comparators to be

controlled. This provides the possibility of oscillation frequency

modulation in the astable mode, or even inhibition of oscillation,

depending on the applied voltage. In the monostable mode, delay

times can be changed by varying the applied voltage to the

CONTROL VOLTAGE pin.

DISHCARGE

THRESHOLD

TRIGGER

OUTPUT

RESET

CONTROL

VOLTAGE

OPTIONAL

CAPACITOR

< 18V

RESET

The RESET terminal is designed to have essentially the same trip

voltage as the standard bipolar 555, i.e., 0.6 to 0.7V. At all supply

voltages it represents an extremely high input impedance. The

mode of operation of the RESET function is, however, much

t = 1.05 R

Figure 3. Monostable Operation

345

August 31, 1994

1...6 7 89

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