Datasheet ALD4501SE, ALD4501PE, ALD4501DE Datasheet (Advanced Linear Devices Inc)

ADVANCED
LINEAR
DEVICES, INC.

QUAD PRECISION HIGH SPEED MICROPOWER TIMER

ALD4501

GENERAL DESCRIPTION

The ALD4501 timer is a high performance QUAD 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; and reduced supply current
spikes allowing smaller and lower cost decoupling capacitors. Each of the
four timers can be independently operated in either the monostable,
astable, or 50% duty cycle mode.

Each timer 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 respec-

+

tively of V

. These levels can be adjusted by using the control terminal.

When the trigger input is below the trigger level, the output is in the high
state and sourcing 2mA. When the 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. All four timers share the same control

and reset pins so that timing functions are synchronized.

FEATURES

• High speed operation -- 2MHz typical oscillation at 5V

• Each discharge output sinking current: 40mA at 5V

• Guaranteed low operating supply voltage of 2 to 12V

• Each timer is functionally equivalent to NE555 with greatly expanded
high and low frequency ranges

• High speed, low power, monolithic CMOS technology

• Low supply current 150µA typical

• Extremely low trigger, threshold and reset currents -- 10pA typical

• Operates in both monostable and astable modes

• Fixed 50% duty cycle or adjustable duty cycle

• CMOS, NMOS and TTL compatible input/output

• Low supply current spikes

ORDERING INFORMATION

Operating Temperature Range *

-55°C to +125°C0°C to +70°C0°C to +70°C
20-Pin 20-Pin 20-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

• Synchronized timer

PIN CONFIGURATION

RST 1

DSC

1

TRIG

1

DSC

2

TRIG

2

DSC

3

TRIG

3

DSC

4

TRIG

4

-

V

2

3

4

5

6

7

8

9

10

DE, PE, SE PACKAGE

20

19

18

17

16

15

14

13

12

11

BLOCK DIAGRAM (EACH TIMER)

+

THRESHOLD

CONTROL

TRIGGER

V

R

R

R

RESET

R

S

+

V

OUT

THRES

OUT

THRES

OUT

THRES

OUT

THRES

CONT

OUTPUT

DISCHARGE

1

1

2

2

3

3

4

4

ALD4501 DE ALD4501 SE ALD4501 PE

* Contact factory for industrial temperature range

-

V

© 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+ +0.3V
Power dissipation 600 mW
Operating temperature range PE, SE package 0°C to + 70°C

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

+

13.2V

DE 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 t
Initial Accuracy

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

TH

TRIG

I

TRIG

RST

I

RST

I

TH

CONT

OL

OH

t

r

t

f

DL

3.233 3.333 3.433 V

1.567 1.667 1.767 V

0.4 0.7 1.0 V

3.233 3.333 3.433 V

212 V

150 270 µA Outputs Unloaded

1.0 2.6 % C = 0.1µF

0.1 %/V RB = 1KΩ

.01 0.4 nA

.01 0.4 nA
.01 0.4 nA

0.2 0.4 V I

4.2 4.6 V I

SINK

SOURCE

10 20 ns RL = 10MΩ
10 20 ns CL = 10pF

.01 nA

= 10mA

= -2mA

Discharge Voltage Drop V

DISC

0.5 1.0 V I

0.2 0.4 V I

Maximum Frequency R
Astable Mode f

Minimum Trigger Pulse Width

Notes:1 Sample tested parameters.

2

Consists of junction leakage currents with strong temperature dependence.

MAX

1

t

TRIG

2 MHz RB = 200Ω

50 100 ns

DISCHARGE
DISCHARGE

= 470Ω

A

=100pF

C

T

= 40mA
= 15mA

ALD4501 Advanced Linear Devices 9-2

TYPICAL PERFORMANCE CHARACTERISTICS

DISCHARGE OUTPUT SINK CURRENT AS A
FUNCTION OF DISCHARGE LOW VOLTAGE

100

TA = 25°C

50
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
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

V+ = 5V

A, RB

( RA - 2RB )

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

1.00.50.2

TA = 25°C

V+ = 2V

+

V

= 5V

+

= 12V

V

0

10 20 30 40

LOWEST VOLTAGE LEVEL OF TRIGGER

PULSE ( % V

+

)

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 VOLTAGE (V)

SUPPLY CURRENT AS A FUNCTION OF

SUPPLY VOLTAGE

300
270
240
210
180
150
120

90

SUPPLY CURRENT (µA)

60
30

0

2 4 6 8 10 12

0

SUPPLY VOLTAGE (V)

612

108

T = - 40°C

A

T = + 20°C

A

T = + 85°C

A

ALD4501 Advanced Linear Devices 9-3

TYPICAL PERFORMANCE CHARACTERISTICS

OUTPUT SINK CURRENT AS A FUNCTION

OF OUTPUT VOLTAGE

100

TA = 25°C

50

20

10

5.0

2.0

1.0

0.5

0.2

OUTPUT SINK CURRENT (mA)

0.1

0.01 0.02

0.05 0.1

OUTPUT VOLTAGE (V)

QUAD ASTABLE MODE OPERATION

( FREE RUNNING OSCILLATOR )

+

V

1

RA

1

2

RB

1

3

C

1

RA

2

4

RB

2

5

C

2

RA3

6

RB

3

7

C

3

RA

4

8

RB

4

9

C

4

10

-

V

Frequency f = 1.46/ ( R
Duty Cycle DC = R

B

/ ( R

+ 2RB ) C

A

+ 2RB )

A

V

+

= 12V

V+ = 5V

V+ = 2V

OUTPUT SOURCE CURRENT (mA)

1.00.50.2

TYPICAL APPLICATIONS

+

V

20

19

OUT

1

18

17

OUT

2

16

OUT

15

3

14

13

OUT

4

12

11

SYNCHRONIZED TIMING GENERATORS

OUTPUT SOURCE CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE

-0.1

-0.2

-0.5

-1.0

V+ = 2V

V+ = 5V

V+ = 12V

-2.0

-5.0

-10

-20

-50

-100

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

-1.0
OUTPUT VOLTAGE (V)

(REFERENCED TO V

QUAD MONOSTABLE MODE OPERATION

( ONE SHOT PULSE )

+

V

1

R

1

2

INPUT 1

3

R

2

4

INPUT 2

5

R

3

6

INPUT 3

7

R

4

8

INPUT 4

9

10

-

V

+

V

20

19

18

17

16

15

14
13

12

11

+

)

DELAY 1

C

1

DELAY 2

C

2

DELAY 3

C

3

DELAY 4

C

4

Pulse Delay td = 1.1R

C

20

OUT 1

19

R

18

C

17

OUT 2

R

16

C

15

OUT 3

R

14

C

13

R

12

Timer 4 oscillates in free running mode
( 50 % Duty Cycle ) and drives the trigger
inputs of timers 1,2,3, each with indepen­dently set time delays.

TIMER 1

TIMER 2

TIMER 3

TIMER 4

1

2

3

4

5

6
7

8

C

9

10 11

ALD4501 Advanced Linear Devices 9-4