ald555 Advanced Linear Devices Inc (ALD), ald555 Datasheet

ald555

Manufacturer Part Number

ald555

Description

High Speed Cmos Timer

Manufacturer

Advanced Linear Devices Inc (ALD)

Datasheet

1.ALD555.pdf (4 pages)

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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 (mono-

stable) 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 200K each)

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

respectively of V +

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

• High speed, low power, monolithic CMOS technology

• Low supply current 100 A 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

• High discharge sinking current (80mA)

• Low supply current spikes

ORDERING INFORMATION

and low frequency ranges

CMOS, NMOS and TTL compatible input/output

-55 C to +125 C

8-Pin

CERDIP

Package

ALD555 DA

INEAR

DVANCED

EVICES,

These levels can be adjusted by using the control

Operating Temperature Range *

NC.

0 C to +70 C

8-Pin

Small Outline

ALD555 SA

Package (SOIC)

HIGH SPEED CMOS TIMER

0 C to +70 C

8-Pin

Plastic Dip

Package

ALD555 PA

APPLICATIONS

PIN CONFIGURATION

BLOCK DIAGRAM

•

• Precision timing

• Sequential timing

• Long delay timer

• Pulse width and pulse position

• Missing pulse detector

• Frequency divider

High speed one-shot (monostable)

pulse generation

modulation

TRIGGER

GROUND

THRESHOLD

OUTPUT

CONTROL

TRIGGER

RESET

(5)

(2)

(6)

GND

(1)

(8)

DA, PA, SA PACKAGE

TOP VIEW

RESET

(4)

DISCHARGE

THRESHOLD

CONTROL

ALD555

DISCHARGE

OUTPUT

(3)

(7)

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ald555 Summary of contents

Page 1

... EVICES, NC. 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 ...

Page 2

... Output Voltage Drop (High) Rise Time of Output 1 Fall Time of Output 1 Discharge Transistor Leakage Current Discharge Voltage Drop Maximum Frequency Astable Mode Notes: 1 Sample tested parameters. 2 Consists of junction leakage currents with strong temperature dependence. ALD555 PA,SA package DA package Symbol Min Typ 100 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 ALD555 800 + 700 600 + 500 400 300 200 100 0.2 0.5 1.0 R AND C B ...

Page 4

... OUTPUT VOLTAGE (V) ASTABLE MODE OPERATION 50% DUTY CYCLE Frequency (1.4 R TRIGGER INPUT DELAYED PULSE OUTPUT RESET ALD555 + 12V + 0.2 0.5 1.0 TYPICAL APPLICATIONS + MONOSTABLE MODE OPERATION (ONE SHOT PULSE) Pulse Delay Advanced Linear Devices ...

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