CTRL(1)

RF ≅2.2 MΩ

CL ≅16 pF

C1 ≅32 pF

C2 ≅32 pF

XOUT

XIN

OSCOUT

Y

A

Optional Signal-Conditioning Stage

CLOAD

RLOAD

CLOAD

RLOAD

Rs ≅1 kΩ

10

SN74LVC1404

SCES469F – AUGUST 2003 – REVISED MARCH 2020

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9 Detailed Description

9.1 Overview

The SN74LVC1404 device consists of one inverter with a Schmitt-trigger input and two unbuffered inverters. It is

designed for 1.65-V to 5.5-V VCC operation.

XIN and XOUT pins can be connected to a crystal or resonator in oscillator applications. The SN74LVC1404

device provides an additional unbuffered inverter (OSCOUT) and a Schmitt-trigger input inverter for signal

conditioning (see the Functional Block Diagram). 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.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,

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

NanoFree™ package technology is a major breakthrough in IC packaging concepts, using the die as the

package.

9.2 Functional Block Diagram

9.3 Feature Description

•

Wide operating voltage range

–

Operates from 1.65 V to 5.5 V

•

Has buffered output and un-buffered output from oscillator

•

Schmitt-trigger buffer

–

Allows for extra buffering of the oscillator output

•

Ioff feature

–

Allows voltages on the inputs and outputs when VCC is 0 V