ST TS555 User Manual

Features

■ Very low power consumption:

110 µA typ at V 90 µa typ at V

■ High maximum astable frequency of 2.7 MHz

■ Pin-to-pin functionally-compatible with bipolar

CC

= 5 V

= 3 V

NE555

■ Wide voltage range: +2 V to +16 V

■ Supply current spikes reduced during output

transitions

■ High input impedance: 10

■ Output compatible with TTL, CMOS and logic

12

Ω

MOS

Description

TS555

Low power single CMOS timer

N

DIP8

(Plastic package)

D

SO8

(Plastic micropackage)

The TS555 is a single CMOS timer with a very low consumption: (I

cc(TYP)

I

cc(TYP)

TS555 = 110 µA at V

NE555 = 3 mA),

= +5 V versus

CC

and high frequency: (f f

(max)

TS555 = 2.7 MHz versus

f(max.)

NE555 = 0.1 MHz).

Timing remains accurate in both monostable and astable mode.

The TS555 provides reduced supply current spikes during output transitions, which enable the use of lower decoupling capacitors compared to those required by bipolar NE555.

12

With the high input impedance (10

Ω), timing

capacitors can also be minimized.

P

TSSOP8

(Thin shrink small outline package)

Pin connections

(top view)

GND

Trigger

Output

Reset

1

2

3

4

8

7

6

5

V

CC

Discharge

Threshold

Control Voltage

November 2008 Rev 2 1/20

www.st.com

20

Absolute maximum ratings and operating conditions TS555

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

V

I

OUT

CC

Supply voltage +18 V

Output current ± 100 mA

Thermal resistance junction to ambient

(1)

R

thja

DIP8

(2)

SO8 TSSOP8

(2)

85 125 120

°C/W

Thermal resistance junction to case

(1)

R

thjc

T

j

T

stg

ESD

1. Short-circuits can cause excessive heating. These values are typical and specified for a single layer PCB.

2. Short-circuits can cause excessive heating. These values are typical and specified for a four layers PCB.

3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a

1.5kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.

4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins remain floating.

5. Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to the ground.

Table 2. Operating conditions

DIP8

(2)

SO8 TSSOP8

(2)

Junction temperature +150 °C

Storage temperature range -65 to +150 °C

Human body model (HBM)

Charged device model (CDM)

(3)

(4)

(5)

41 40 37

1500

200

1000

°C/W

VMachine model (MM)

Symbol Parameter Value Unit

V

I

OUT

CC

Supply voltage 2 to 16 V

Output sink current Output source current

Operating free air temperature range

T

oper

TS555C TS555I TS555M

2/20

10 50

0 to +70

-40 to +125

-55 to +125

mA

°C

TS555 Schematic diagrams

R1

50k

Ω

Τ1

R2

50k

Ω

R3

50k

Ω

R4

50k

Ω

R5

50k

Ω

R6

50k

Ω

Τ2

Τ4

Threshold

Τ5

Τ6

Τ7

Τ14

Τ8

Τ9

Τ15

Τ16

Τ17

Τ18 Τ19

Trigger

Τ24

Τ22

Τ23

Τ28

Τ29

Τ32

Τ35

Τ33

Discharge

Output

Τ10

Τ11

Τ12 Τ13

Τ20

Τ21

Τ26

Τ25

Τ27 Τ30

Τ31

Τ34

GND

RESET

V

CC

R7

2 Schematic diagrams

Figure 1. Schematic diagram

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Schematic diagrams TS555

Output

Discharge

Ground

Trigger

Control

Voltage

Threshold

V

CC

Reset

1

6

5

2

8

4

R

B

A

R1

R

S

Q

+

-

+

-

7

3

TS555

Figure 2. Block diagram

Table 3. Functions table

Reset Trigger Threshold Output

Low x x Low

High Low x High

High High High Low

High High Low Previous state

Note: LOW: level voltage ≤ minimum voltage specified.

HIGH: level voltage ≥ maximum voltage specified. x: irrelevant.

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TS555 Electrical characteristics

3 Electrical characteristics

Table 4. Static electrical characteristics

= +2 V, T

V

CC

Symbol Parameter Min. Typ. Max. Unit

= +25° C, Reset to VCC (unless otherwise specified)

amb

I

CC

V

I

DIS

V

TRIG

I

TRIG

I

V

RESET

I

RESET

Supply current (no load, high and low states)

≤ T

T

min.

amb

≤ T

max

Control voltage level

CL

T

min.

≤ T

amb

≤ T

max

Discharge saturation voltage (I

DIS

T

min.

≤ T

amb

≤ T

max

= 1 mA)

dis

1.2

1.1

65 200

1.3 1.4

0.05 0.2

Discharge pin leakage current 1 100 nA

Low level output voltage (I

OL

T

min.

≤ T

amb

High level output voltage (I

OH

T

min.

≤ T

amb

Trigger voltage

≤ T

T

min.

amb

≤ T

max

sink

source

= 1 mA)

= -0.3 mA)

1.5

0.4

0.3

0.1 0.3

1.9

0.67 0.95

Trigger current 10 pA

Threshold current 10 pA

TH

Reset voltage

T

≤ T

min.

amb

≤ T

max

0.4

0.3

1.1 1.5

Reset current 10 pA

200

1.5

0.25

0.35

1.05

2.0

µA

V

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Electrical characteristics TS555

Table 5. Static electrical characteristics

= +3 V, T

V

CC

Symbol Parameter Min. Typ. Max. Unit

= +25° C, Reset to VCC (unless otherwise specified)

amb

I

CC

V

I

DIS

V

TRIG

I

TRIG

I

V

RESET

I

RESET

Supply current (no load, high and low states)

T

≤ T

amb

≤ T

max

min.

Control voltage level

CL

T

min.

≤ T

amb

≤ T

max

Discharge saturation voltage (I

DIS

T

min.

≤ T

amb

≤ T

max

= 1 mA)

dis

1.8

1.7

90 230

22.2

0.05 0.2

Discharge pin leakage current 1 100 nA

Low level output voltage (I

OL

T

min.

≤ T

amb

High level output voltage (I

OH

T

min.

≤ T

amb

Trigger voltage

≤ T

T

min.

amb

≤ T

max

sink

source

= 1 mA)

= -0.3 mA)

2.5

0.9

0.8

0.1 0.3

2.9

11.1

Trigger current 10 pA

Threshold current 10 pA

TH

Reset voltage

≤ T

T

min.

amb

≤ T

max

0.4

0.3

1.1 1.5

Reset current 10 pA

230

2.3

0.25

0.35

1.2

2.0

µA

V

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