TS555 datasheet(9/12 Pages) STMICROELECTRONICS

Part #	TS555

Description	LOW POWER SINGLE CMOS TIMER

Download	12 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

9 / 12 page

TS555

9/12

ASTABLE OPERATION

When the circuit is connected as shown in figure 4

(pin 2 and 6 connected) it triggers itself and free

runs as a multivibrator. The external capacitor

charges through RA and RB and discharges

through RB only. Thus the duty cycle may be pre-

cisely set by the ratio of these two resistors.

In the astable mode of operation, C charges and

discharges between 1/3 VCC and 2/3 VCC. As in

the triggered mode, the charge and discharge

times and therefore frequency, are independent of

the supply voltage.

Figure 4:

Figure 5 shows actual waveforms generated in

this mode of operation.

The charge time (output HIGH) is given by :

t1 = 0.693 (RA + RB) C

and the discharge time (output LOW) by :

t2 = 0.693 x RB x C

Thus the total period T is given by :

T = t1 + t2 = 0.693 (RA + 2RB) C

The frequency of oscillation is then :

The duty cycle is given by :

Figure 5:

VCC

Reset

Out

3

4

8

7

5

1

TS555

R

C

2

6

R

A

B

Control

Voltage

0.01 F

µ

f =

1

T

--- =

1.44

(

RA

2

RB

)C

+

--------------------------------------

D =

RB

RA

2

RB

+

---------------------------

Ω

µ

t = 0.5 ms / div

OUTPUT VOLTAGE = 5.0V/div

CAPACITOR VOLTAGE = 1.0V/div

L

R = R = 4.8 k , C = 0.1 F , R = 1.0k

AB

Similar Part No. - TS555

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	TS555	84Kb / 12P	LOW POWER SINGLE CMOS TIMERS
	TS555C	84Kb / 12P	LOW POWER SINGLE CMOS TIMERS
	TS555CD	84Kb / 12P	LOW POWER SINGLE CMOS TIMERS
	TS555CD	234Kb / 20P	Low power single CMOS timer
	TS555CDT	234Kb / 20P	Low power single CMOS timer

More results

Similar Description - TS555

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	TS555	427Kb / 19P	Low-power single CMOS timer June 2015
	TS555CDT	234Kb / 20P	Low power single CMOS timer
	TS556	129Kb / 11P	LOW POWER DUAL CMOS TIMER
	TS556	186Kb / 19P	Low-power dual CMOS timer
Samsung semiconductor	KS555	202Kb / 4P	CMOS SINGLE TIMER
Advanced Linear Devices	ALD7555	88Kb / 12P	SINGLE/DUAL CMOS ANALOG RC TIMER
National Semiconductor ...	LMC555	318Kb / 12P	CMOS Timer
National Semiconductor ...	LMC555	772Kb / 12P	CMOS Timer
Texas Instruments	LMC555	1Mb / 28P	[Old version datasheet] CMOS Timer
ELM Technology Corporat...	ELMC555AA-S	67Kb / 3P	CMOS Timer

More results

TS555 Datasheet(PDF) 9 Page - STMicroelectronics

TS555 Datasheet(HTML) 9 Page - STMicroelectronics

Similar Part No. - TS555

Similar Description - TS555

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Datasheet Download

Link URL