Datasheet ALD555SA, ALD555PA, ALD555DA Datasheet (Advanced Linear Devices Inc)

ADVANCED
LINEAR
DEVICES, INC.

ALD555

HIGH SPEED CMOS TIMER

GENERAL DESCRIPTION

The ALD555 timer is a high performance monolithic timing circuit built with
advanced silicon gate CMOS technology. It offers the benefits of high
input impedance, thereby allowing smaller timing capacitors and longer
timing cycle; high speed, with typical cycle time of 500ns; low power
dissipation for battery operated environment; reduced supply current
spikes, allowing smaller and lower cost decoupling capacitors. It is
capable of producing accurate time delays and oscillations in both
monostable and astable operation. It operates in the one-shot (mono­stable) mode or 50% duty cycle free running oscillation mode with a single
resistor and one capacitor. The inputs and outputs are fully compatible
with CMOS, NMOS or TTL logic.

There are three matched internal resistors (approximately 200KΩ each)
that set the threshold and trigger levels at two-thirds and one-third

+

respectively of V

These levels can be adjusted by using the control

.

terminal (pin 5). When the trigger input is below the trigger level, the
output is in the high state and sourcing 2mA. When threshold input is
above the threshold level at the same time the trigger input is above the
trigger level, the internal flip-flop is reset, the output goes to the low state
and sinks up to 10mA. The reset input overrides all other inputs and when
it is active (reset voltage less than 1V), the output is in the low state.

FEATURES

• Functional equivalent to NE555 with greatly expanded high
and low frequency ranges

• High speed, low power, monolithic CMOS technology

• Low supply current 100

µA typical

• Extremely low trigger, threshold and reset currents -- 1pA typical

• High speed operation -- 2MHz oscillation

• Low operating supply voltage 2 to 12V

• Operates in both monostable and astable modes

• Fixed 50% duty cycle or adjustable duty cycle
CMOS, NMOS and TTL compatible input/output

• High discharge sinking current (80mA)

• Low supply current spikes

ORDERING INFORMATION

Operating Temperature Range *

-55°C to +125°C0°C to +70°C0°C to +70°C
8-Pin 8-Pin 8-Pin

CERDIP Small Outline Plastic Dip
Package Package (SOIC) Package

APPLICATIONS

• High speed one-shot (monostable)

pulse generation

• Precision timing

• Sequential timing

• Long delay timer

• Pulse width and pulse position
modulation

• Missing pulse detector

• Frequency divider

PIN CONFIGURATION

GROUND

TRIGGER

OUTPUT

RESET

1

2

3

4

TOP VIEW

DA, PA, SA PACKAGE

8

7

6

5

V

DISCHARGE

THRESHOLD

CONTROL

BLOCK DIAGRAM

+

THRESHOLD

(6)

CONTROL

(5)

TRIGGER

(2)

GND

V
(8)

R

R

R

(1)

RESET

(4)

R

S

+

OUTPUT

(3)

DISCHARGE

(7)

ALD555 DA ALD555 SA ALD555 PA

* Contact factory for industrial temperature range

© 1998 Advanced Linear Devices, Inc. 415 T asman Drive, Sunnyvale, California 94089 -1706 Tel: [phone] Fax: [phone] http://www .aldinc.com

ABSOLUTE MAXIMUM RATINGS

Supply voltage, V
Input voltage range -0.3V to V
Power dissipation 600 mW
Operating temperature range PA,SA package 0°C to +70°C

Storage temperature range -65°C to +150°C
Lead temperature, 10 seconds +260°C

+

13.2V
+

+0.3V

DA package -55°C to +125°C

OPERATING ELECTRICAL CHARACTERISTICS

oC

= 25

T

A

Parameter Symbol Min Typ Max Unit Test Conditions

Supply Voltage V

Supply Current I

Timing error / Astable mode
Initial Accuracy t

Drift with Temperature
Drift with Supply Voltage

Threshold Voltage V

Trigger Voltage V

Trigger Current

Reset Voltage V

Reset Current
Threshold Current

Control Voltage Level V

Output Voltage Drop (Low) V

Output Voltage Drop (High) V

Rise Time of Output
Fall Time of Output

Discharge Transistor I
Leakage Current

+

V

= +5V unless otherwise specified

+

S

err

1

1

2

2

2

1

1

∆t/∆T 10.0 ppm/°CRA = 1KΩ

+

∆t/∆V

3.273 3.333 3.393 V

1.607 1.667 1.737 V

0.4 0.7 1.0 V

3.273 3.333 3.393 V

I

TH

TRIG

I

TRIG

RST

RST

I

TH

CONT

OL

OH

t

r

t

f

DL

212 V

100 180 µA Outputs Unloaded

1.0 2.2 % C = 0.1µF

0.1 %/V RB = 1KΩ

.001 0.2 nA

.001 0.2 nA
.001 0.2 nA

0.2 0.4 V I

4.2 V I

= 10mA

SINK

SOURCE

15 30 ns RL = 10MΩ
10 20 ns CL = 10pF

.01 nA

= -2mA

Discharge Voltage Drop V

DISC

0.5 1.0 V I

0.2 0.4 V I

Maximum Frequency R
Astable Mode f

Notes:1 Sample tested parameters.

2

Consists of junction leakage currents with strong temperature dependence.

MAX

1.4 2 MHz RB = 200Ω

DISCHARGE
DISCHARGE

= 470Ω

A

= 200pF

C

T

= 80mA
= 30mA

ALD555 Advanced Linear Devices 9-2

TYPICAL PERFORMANCE CHARACTERISTICS

DISCHARGE OUTPUT SINK CURRENT AS A
FUNCTION OF DISCHARGE LOW VOLTAGE

100

50

TA = 25°C

20

10

5.0

2.0

1.0

0.5

0.2

DISCHARGE SINK CURRENT (mA)

0.1

0.01 0.02 0.05 0.1 1.00.50.2
DISCHARGE LOW VOLTAGE (V)

V+ = 12V

FREE RUNNING FREQUENCY AS A

FUNCTION OF R

10 mF

1 mF

100 µF

10 µF

1 µF

100 nF

10 nF

CAPACITANCE

1 nF

100 pF

100MΩ

1KΩ

10KΩ

100KΩ

1MΩ

10MΩ

A, RB

( RA - 2RB )

V+ = 5V

V+ = 2V

AND C

TA = 25°C

MINIMUM PULSE WIDTH

REQUIRED FOR TRIGGERING

800

700

600

500
400
300
200

100

MINIMUM PULSE WIDTH (ns)

0

TA = 25°C

V+ = 2V

V
V

0

10 20 30 40

LOWEST VOLTAGE LEVEL OF TRIGGER

PULSE ( % V

+

= 5V

+

= 12V

+

)

FREQUENCY CHANGE IN THE ASTABLE MODE

AS A FUNCTION OF SUPPLY VOLTAGE

+4
+3
+2

+1

0

-1

-2

-3

FREQUENCY CHANGE (%)

-4

100.1 100

1.0 1K

10K

FREQUENCY (Hz)

TIME DELAY IN THE MONOSTABLE MODE

AS A FUNCTION OF R

10 mF

1 mF

100 µF

10 µF

1 µF

100 nF

10 nF

CAPACITANCE

1 nF

100 pF

TA = 25°C

100ns 1µs 1ms 1s 10s

10µs 100µs 10ms 100ms 100s

R

A

1KΩ

10KΩ

TIME DELAY

100K 10M 100M1M

100KΩ

1MΩ

10MΩ

100MΩ

AND C

A

1GΩ

02 4

SUPPLY CURRENT AS A FUNCTION OF

200

180

160

140

120

100

80
60

40

SUPPLY CURRENT (uA)

20

0

0

2

SUPPLY VOLTAGE (V)

SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

612

4

6 8 10 12

108

TA = - 40°C
TA = + 20°C
T

= + 85°C

A

ALD555 Advanced Linear Devices 9-3

TYPICAL PERFORMANCE CHARACTERISTICS

OUTPUT SINK CURRENT AS A

100

OUTPUT SINK CURRENT (mA)

FUNCTION OF OUTPUT VOLTAGE

TA = 25°C

50
20

10

5.0

2.0

1.0

0.5

0.2

0.1

0.01 0.02 0.05 0.1 1.00.50.2
OUTPUT VOLTAGE (V)

ASTABLE MODE OPERATION

50% DUTY CYCLE

1

2

R

3

+

V

4

V+ = 12V

8

7

6

5

V+ = 5V

V+ = 2V

OUTPUT SOURCE CURRENT (mA)

-100

TYPICAL APPLICATIONS

+

V

0.1µF

C

-0.1

-0.2

-0.5

-1.0

-2.0

-5.0

-10

-20

-50

V

OUTPUT SOURCE CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE

V+ = 2V

V+ = 5V

V+ = 12V

-0.5 -0.2 -0.1 -0.05 -0.02 -0.01

-1.0
OUTPUT VOLTAGE (V)

(REFERENCED TO V

ASTABLE MODE OPERATION

(FREE RUNNING OSCILLATOR)

1

2

3

+

4

8

7

6

5

+

)

+

V

R

A

R

B

0.1µF

C

Frequency f = 1/ (1.4 RC)

Frequency f = 1.46 / (RA + 2RB)C
Duty Cycle DC = R

/ (RA + 2RB)

B

MONOSTABLE MODE OPERATION (ONE SHOT PULSE)

TRIGGER

INPUT

DELAYED PULSE

OUTPUT

RESET

Pulse Delay td = 1.1 R

1

2

3

4

C

+

V

8

7

6

5

R

C

0.1µF

ALD555 Advanced Linear Devices 9-4