ST TS556 User Manual

Features

Control Voltage

1

2

3

4

5

6

7

14

13

12

11

10

9

8

Discharge

Threshold

Reset

Output

Trigger

GND

Control

Voltage

+V

Discharge

Threshold

Reset

Output

Trigger

S

■ Very low power consumption:

220 µA typ at V 180 µA typ at V

■ High maximum astable frequency 2.7 MHz

■ Pin-to-pin and functionally compatible with

CC

= 5 V

= 3 V

bipolar NE556

■ 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

TS556

Low-power dual CMOS timer

N

DIP14

(Plastic package)

D

SO14

(Plastic micropackage)

The TS556 is a dual CMOS timer which offers a very low consumption: (I

cc(TYP)

I

cc(TYP)

TS556 = 220 µA at VCC=+5V versus

NE556 = 6 mA), and high frequency: (f

TS556 = 2.7 MHz versus

(max.)

f

NE556 = 0.1 MHz).

(max.)

In both monostable and astable modes, timing remains very accurate.

The TS556 provides reduced supply current spikes during output transitions, which enable the use of lower decoupling capacitors compared to those required by bipolar NE556.

Due to the high input impedance (10

12

Ω), timing

capacitors can also be minimized.

Pin connections

(top view)

October 2008 Rev 2 1/19

www.st.com

19

Absolute maximum ratings and operating conditions TS556

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

R

thja

DIP14 SO14

(2)

(1)

80

105

°C/W

Thermal resistance junction to case

R

thjc

T

j

T

stg

Junction Temperature +150 °C

Storage Temperature Range -65 to +150 °C

Human body model (HBM)

ESD

Charged device model (CDM)

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

DIP14 SO14

(2)

(1)

(4)

(3)

(5)

33 31

1200

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

TS556C TS556I TS556M

2/19

10 50

0 to +70

-40 to +125

-55 to +125

mA

°C

TS556 Schematic diagram

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 diagram

Figure 1. Schematic diagram (1/2 TS556)

3/19

Schematic diagram TS556

Output

Discharge

Ground

Trigger

Control

Voltage

Threshold

V

CC

Reset

R

B

A

R1

R

S

Q

+

-

+

-

4 / 10

5 / 9

14

2 / 12

3 / 11

6 / 8

7

1 / 13

TS556

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.

4/19

TS556 Electrical characteristics

3 Electrical characteristics

Table 4. Static electrical characteristics

V

= +2 V, T

CC

Symbol Parameter Min. Typ. Max. Unit

= +25 °C, Reset to V

amb

(unless otherwise specified)

CC

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

130 400

1.3 1.4

0.05 0.2

Discharge pin leakage current 1 100 nA

Low level output voltage (I

OL

T

≤ T

min.

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

amb

≤ T

min.

max

0.4

0.3

1.1 1.5

Reset current 10 pA

400

1.5

0.25

0.35

1.05

2.0

µA

V

5/19

Electrical characteristics TS556

Table 5. Static electrical characteristics

V

= +3 V, T

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

≤ T

amb

≤ T

max

min

Discharge saturation voltage (I

DIS

T

≤ T

amb

≤ T

max

min

= 1 mA)

dis

1.8

1.7

180 460

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

460

2.3

0.25

0.35

1.2

2.0

µA

V

6/19