ald4501 Advanced Linear Devices Inc (ALD), ald4501 Datasheet

ald4501

Manufacturer Part Number

ald4501

Description

Quad Precision High Speed Micropower Timer

Manufacturer

Advanced Linear Devices Inc (ALD)

Datasheet

1.ALD4501.pdf (4 pages)

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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.

compatible with CMOS, NMOS or TTL logic.

There are three matched internal resistors (approximately 200K

that set the threshold and trigger levels at two-thirds and one-third respec-

tively of V

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 speed, low power, monolithic CMOS technology

• Low supply current 150 A 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

* Contact factory for industrial temperature range

ORDERING INFORMATION

high and low frequency ranges

-55 C to +125 C

20-Pin

CERDIP

Package

ALD4501 DE

These levels can be adjusted by using the control terminal.

INEAR

DVANCED

EVICES,

Operating Temperature Range *

NC.

QUAD PRECISION HIGH SPEED MICROPOWER TIMER

0 C to +70 C

20-Pin

Small Outline

Package (SOIC)

ALD4501 SE

The inputs and outputs are fully

0 C to +70 C

20-Pin

Plastic Dip

Package

ALD4501 PE

each)

PIN CONFIGURATION

APPLICATIONS

• High speed one-shot (monostable)

• Precision timing

• Sequential timing

• Long delay timer

• Pulse width and pulse position

• Missing pulse detector

• Frequency divider

• Synchronized timer

BLOCK DIAGRAM (EACH TIMER)

pulse generation

modulation

THRESHOLD

CONTROL

TRIGGER

TRIG

DSC

RST

DE, PE, SE PACKAGE

RESET

ALD4501

THRES

OUT

THRES

OUT

THRES

OUT

THRES

CONT

DISCHARGE

OUTPUT

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ald4501 Summary of contents

Page 1

... NC. QUAD PRECISION HIGH SPEED MICROPOWER TIMER 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 ...

Page 2

... Fall Time of Output 1 Discharge Transistor Leakage Current Discharge Voltage Drop Maximum Frequency Astable Mode Minimum Trigger Pulse Width 1 Notes: Sample tested parameters. 2 Consists of junction leakage currents with strong temperature dependence. ALD4501 PE, SE package DE package Symbol Min Typ 150 S t 1.0 err ...

Page 3

... TIME DELAY IN THE MONOSTABLE MODE AS A FUNCTION 100 100 100 pF 100ns 100 s 1ms 10ms 100ms TIME DELAY ALD4501 + 0.2 0.5 1.0 R AND 10M 100M AND ...

Page 4

... RA3 Frequency f = 1.46 Duty Cycle TIMER 1 TIMER 2 TIMER 3 TIMER 4 ALD4501 -0.1 -0 -0.5 -1.0 -2 -5.0 -10 -20 -50 -100 0.2 0.5 1.0 TYPICAL APPLICATIONS + OUT OUT OUT OUT 4 12 ...

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