LMC555 datasheet(3/35 Pages) TI2

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4 Pin Configuration and Functions

Figure 4-1. D Package, 8-Pin SOIC,

DGK Package, 8-Pin VSSOP,

and P Package, 8-Pin PDIP (Top View)

Figure 4-2. YPB Package, 8-Pin DSBGA (Top View)

Table 4-1. Pin Functions

TYPE

DESCRIPTION

NAME

NO.

D (SOIC),

DGK (VSSOP),

P (PDIP)

YPB (DSBGA)

CONTROL

VOLTAGE

Input

Control voltage controls the threshold and trigger levels. This pin determines

the pulse duration of the output waveform. An external voltage applied to this

pin can also be used to modulate the output waveform.

DISCHARGE

Input

Open collector output that discharges a capacitor between intervals (in

phase with output). This pin toggles the output from high to low when voltage

reaches 2/3 of the supply voltage (V+).

GROUND

Power

Ground reference voltage

OUTPUT

Output

Output driven waveform

RESET

Input

Negative pulse applied to this pin to disable or reset the timer. When not

used for reset purposes, connect this pin to V+ to avoid false triggering.

THRESHOLD

Input

Compares the voltage applied to the pin with a reference voltage of 2/3 V+.

The amplitude of voltage applied to this pin is responsible for the set state of

the flip-flop.

TRIGGER

Input

Responsible for transition of the flip-flop from set to reset. The output of the

timer depends on the amplitude of the external trigger pulse applied to this

pin.

V+

Power

Supply voltage with respect to ground

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LMC555

SNAS558N – JANUARY 2000 – REVISED MARCH 2024

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