UNISONIC TECHNOLOGIES CO., LTD

USA555

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2014 Unisonic Technologies Co., Ltd

QW-R106-005.C

PRECISION TIMERS

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DESCRIPTION

The UTC USA555 monolithic timing circuit is a highly stable

controller capable of producing accurate time delays or

oscillation. In the time-delay 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 two-thirds and

of the control-voltage terminal. When the trigger input falls below

the trigger level, the flip-flop is set, and the output 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 low-impedance path is provided between

discharge (DISCH) and ground.

The circuit may be triggered and reset on falling waveforms,

and the output structure can source or sink up to 200mA.

Operation is specified for supplies of 5V~15V.

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FEATURES

* Astable or monostable operation

* Low turn off time

* Operates in both astable and monostable modes

* Timing from microseconds to hours

* Adjustable duty cycle

* TTL-compatible output can sink or source up to 200mA

SOP-8

DIP-8

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ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

-

USA555G-S08-R

SOP-8

Tape Reel

USA555L-D08-T

USA555G-D08-T

DIP-8

Tube

Note: xx: Output Voltage, refer to Marking Information.