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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

CTRL

XOUT

OSCOUT

1

2

7

Y

6

XIN

3

5

A

SN74LVC1404

OSCILLATOR DRIVER

FOR CRYSTAL OSCILLATOR OR CERAMIC RESONATOR

SCES469D – AUGUST 2003 – REVISED JANUARY 2007

XIN and XOUT pins can be connected to a crystal or resonator in oscillator applications. The device provides an

additional unbuffered inverter (OSCOUT) and a Schmitt-trigger input inverter for signal conditioning (see

Figure 3). The control (CTRL) input disables the oscillator circuit to reduce power consumption. The oscillator

circuit is disabled and the XOUT output is set to low level when CTRL is low. To ensure the oscillator circuit

remains disabled during power up or power down, CTRL should be connected to GND through a pulldown

resistor. The minimum value of the resistor is determined by the current-sourcing capability of the driver.

preventing damaging current backflow through the device when it is powered down.

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FUNCTION TABLES

INPUTS

OUTPUTS

CTRL

XIN

XOUT

OSCOUT

H

L

H

L

H

H

L

H

L

X

L

H

INPUT

OUTPUT

A

Y

L

H

H

L

LOGIC DIAGRAM (POSITIVE LOGIC)

2

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