Diodes NA555 User Manual

Description

These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the timedelay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor.

The threshold and trigger levels normally are t wo-thirds and one-third, respectively, of V by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the out put goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes low. When the output is low, a lowimpedance path is provided between discharge (DISCH) and

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ground. The output circuit is capable of sinking or sourcing current up

to 200mA. Operation is specified for supplies of 5V to 15V. With a 5-V supply, output levels are compatible with TTL inputs.

Features

. These levels can be altered

CC

NE555/SA555/NA555

Pin Assignments

(Top View)

GND

TRIG

OUT

RESET

PRECISION TIMERS

SO-8

V

CC

DISCH THRES

CONT

• Timing from microseconds to hours

• Astable or monostable operation

• Adjustable duty cycle

• TTL compatible output can source or sink up to 200mA

• “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

NE555/SA555/NA555

Document number: DS35112 Rev. 4 - 2

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Pin Descriptions

Pin Name Pin Number Description

GND 1 Ground

TRIG 2

OUT 3 Timer output

RESET 4 Reset active low

CONT 5 External adjustment of internal threshold and trigger voltages

THRES 6

DISCH 7 Low impedance discharge path

VCC

Functional Block Diagram

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Functional Table

Pin Name

GND Irrelevant Irrelevant Low On TRIG

OUT

RESET

Nominal Trigger

Voltage

<1/3V <1/3V <1/3V

Trigger set 1/3V

Threshold set to 2/3 V

8 Chip supply voltage

CC

RESET can override TRIG, which can override THRESH

Threshold

Voltage

CC

<2/3VCC

CC

<2/3VCC

CC

Irrelevant High Off

NE555/SA555/NA555

CC

Output

Low On

As previously established

Discharge

Switch

PRECISION TIMERS

NE555/SA555/NA555

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NE555/SA555/NA555

Absolute Maximum Ratings (Note 2) @ T

Symbol Parameter Rating Unit

VCC

VI IO

θ

JA

θ

JC

TJ

T

STG

Supply voltage (Note 3) 18 V Input voltage CONT, RESET, THRES, TRIG Output current ±225 mA Package thermal resistance Junction-to-Ambient Package thermal resistance Junction-to-Case Junction temperature 150 °C Storage temperature -65 to 150 °C

Recommended Operating Conditions (T

Symbol Parameter Min Max Unit

VCC

VI

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IO

TA

Notes: 2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

3. All voltage values are with respect ground.

4. Maximum power dissipation is a function of T is P

5. Maximum power dissipation is a function of T is P

Supply voltage 4.5 Input voltage CONT, RESET, THRES, TRIG Output current

Operating Ambient Temperature

(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature

= (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

D

= (TJ(max) – TC)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

D

J

(max), θJC, and TA. The maximum allowable power dissipation at any allowable ambient temperature

J

Electrical Characteristics (V

= 5V to 15V, TA = 25°C unless otherwise stated)

CC

Symbol Parameter Test conditions Min Typ. Max Unit

VTH

ITH

VTR

ITR

V

RST

I

RST

I

DIS

V

DIS

V

CON

Threshold voltage level Threshold current

(Note 6) 30 250 nA Trigger voltage level Trigger current TRIG at 0V 0.5 2 µA

RESET voltage level 0.3 0.7 1 V RESET current DISCH switch off-state current 20 100 nA

DISCH saturation voltage with output low (Note 7)

CONT voltage (open circuit)

NE555/SA555/NA555

Document number: DS35112 Rev. 4 - 2

= 25°C unless otherwise stated

A

(Note 4) 130 °C/W

(Note 5) 15 °C/W

= 25°C)

A

NE555 0 70 SA555 -40 85 NA555 -40 105

V

= 15V

CC

V

= 5V

CC

= 15V

V

CC

V

= 5V

CC

RESET at V

CC

RESET at 0V -0.4 -1.5

= 15V, I

V

CC

VCC = 5V, I V

= 15V

CC

V

= 5V

CC

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DIS

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= 15mA

= 4.5mA

PRECISION TIMERS

VCC

16 V

8.8 10 11.2

2.4 3.3 4.2

4.5 5 5.6

1.1 1.67 2.2

0.1 0.4

180 480 80 200

9 10 11

2.6 3.3 4

V

±200 mA

CC

February 2012

V

°C

V

mA

mV

V

NE555/SA555/NA555

Electrical Characteristics (V

Symbol Parameter Test conditions Min Typ. Max Unit

VOL

VOH

ICC

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TER

TTC

T

VCC

TRI

TFA

Notes: 6. This parameter influences the maximum value of the timing resistors RA and RB in the circuit of Figure 12. For example, when VCC = 5 V, the maximum value is R = R

7. No protection against excessive pin 7 current is necessary providing package dissipation rating is not exceeded

9. Values specified are for a device in a monostable circuit similar to Figure 9, with the following component values: R

10. Values specified are for a device in an astable circuit similar to Figure 12, with the following component values: R

Low level output voltage

High level output voltage

Supply current

Initial error of timing interval (Note 8)

Temperature coefficient of timing interval

Supply voltage sensitivity of timing interval

Output pulse rise time Output pulse fall time

+ RB ≉ 3.4MΩ, and for VCC = 15 V, the maximum value is 10MΩ.

A

8. Timing interval error is defined as the difference between the measured value and the average value of a random sample from ea ch process run.

= 5V to 15V, TA = 25°C unless otherwise stated)

CC

V

= 15V, I

CC

V

= 15V, I

CC

V

= 15V, I

CC

V

= 15V, I

CC

V

= 5V, I

CC

V

= 5V, I

CC

= 15V, I

V

CC

V

= 15V, I

CC

V

= 5V, I

CC

Output low, no load

Output high, no load Each time, monostable

(Note 9) Each time, astable

= 10mA

OL

= 50mA

OL

= 100mA

OL

= 200mA

OL

= 5mA

OL

= 8mA

OL

= -100mA

OH

= -200mA

OH

= -100mA

OH

V

= 15V

CC

V

= 5V

CC

= 15V

V

CC

V

= 5V

CC

(Note 10) Each time, monostable

(Note 9) Each time, astable

T

= full

A

range (Note 10) Each time, monostable

(Note 9) Each time, astable (Note 10)

CL = 15pF

PRECISION TIMERS

0.1 0.25

0.4 0.75 2 2.5

2.5

0.1 0.35

0.15 0.4

12.75 13.3

12.5

2.75 3.3 10 15 3 6 9 13 2 5

1 3

2.25

50

150

0.1 0.5

0.3 100 300 ns

100 300 ns

= 2kΩ to 100kΩ, C = 0.1uF.

A

= 1kΩ to 100kΩ, C = 0.1uF.

A

V

mA

%

ppm/°C

%/V

NE555/SA555/NA555

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O

EVEL OUTP

O

G

E

O

OUTPU

T VOLTAG

O

OUTPU

T VOLTAG

OLTAG

ROP

Typical Performance Characteristics

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10

7

(V)

4 2

LTA

1

0.7

UT V

0.4

0.2

0.1

0.07

W - L

0.04

OL

0.02

V - L

0.01 12 7 701004020104

V = 5V

CC

T = 25°C

A

I - LOW LEVEL OUTPUT CURRENT (mA)

OL

Low Level Out put Voltage vs.

Low Level Output Current @ V = 5V

T = 105°C

A

T = -40°C

A

CC

NE555/SA555/NA555

PRECISION TIMERS

10

7

V = 10V

CC

4

E (V)

2

1

0.7

0.4

0.2

0.1

0.07

W - LEVEL

0.04

OL

0.02

V - L

0.01 12 7 701004020104

I - LOW LEVEL OUTPUT CURRENT (mA)

OL

Low Level Output Voltage vs.

Low Level Output Current @ V = 10V

T = 25°C

A

T = 105°C

A

T = -40°C

A

CC

10

7 4

E (V)

2

1

0.7

0.4

0.2

0.1

0.07

W - LEVEL

0.04

OL

0.02

V - L

0.01 12 7 701004020104

V = 15V

CC

T = 105°C

A

T = 25°C

A

T = -40°C

A

I - LOW LEVEL OUTPUT CURRENT (mA)

OL

Low Level Output Voltage vs.

Low Level Output Cu r r ent @ V = 15V

CC

2

1.8

1.6

(V)

1.4

1.2

E D

1

0.8

0.6

CC OH

0.4

(V - V ) V

0.2 0

12 7 701004020104

T = -40°C

A

T = 25°C

A

T = 105°C

A

V = 5V to 15V

CC

I - HIGH LEVEL OUTPUT CURRENT (mA)

OH

Drop Between Sup ply Voltage and Ou tput vs.

High Leve l Output Cur r ent

NE555/SA555/NA555

Document number: DS35112 Rev. 4 - 2

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February 2012