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SLYZ022 Datasheet(PDF) 9 Page - Texas Instruments

Part No. SLYZ022
Description  SN74LVCZ244A Octal Buffer/Driver With 3-State Outputs
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

SLYZ022 Datasheet(HTML) 9 Page - Texas Instruments

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µC or
System Logic
OE
V
GND
A1
A4
Y1
Y4
Regulated 3.3 V
µC
System Logic
LEDs
CC
SN74LVCZ244A
www.ti.com
SCES274I – MAY 1999 – REVISED OCTOBER 2014
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
The SN74LVCZ244A 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. This
device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict. To ensure the high-impedance state during power up or power down, OE should
be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking
capability of the driver.
10.2 Typical Application
Figure 4. Typical Application Schematic
10.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Care should be taken to avoid bus
contention, because it can drive currents that would exceed maximum limits. The high drive will also create fast
edges into light loads; therefore, routing and load conditions should be considered to prevent ringing.
Copyright © 1999–2014, Texas Instruments Incorporated
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