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SLYZ022 Datasheet(PDF) 8 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) 8 Page - Texas Instruments

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1Y1
1OE
1A1
1Y2
1A2
1Y3
1A3
1Y4
1A4
2Y1
2OE
2A1
2Y2
2A2
2Y3
2A3
2Y4
2A4
SN74LVCZ244A
SCES274I – MAY 1999 – REVISED OCTOBER 2014
www.ti.com
9 Detailed Description
9.1 Overview
This octal buffer/line driver is designed for 2.7-V to 3.6-V VCC operation.
The SN74LVCZ244A device is organized as two 4-bit line drivers with separate output-enable (OE) inputs. When
OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the
high-impedance state.
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.
When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, 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.
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.
9.2 Functional Block Diagram
9.3 Feature Description
Wide operating voltage range
Operates from 2.7 V to 3.6 V
Allows down-voltage translation
Inputs accept voltages to 5.5 V
Ioff feature
Allows voltages on the inputs and outputs when VCC is 0 V
Power-up 3-state feature
Keeps the outputs in high impedance during power up and allows for hot insertion
9.4 Device Functional Modes
Table 1. Function Table
INPUTS
OUTPUTS
Y
OE
A
L
H
H
L
L
L
H
X
High-Z
8
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Copyright © 1999–2014, Texas Instruments Incorporated
Product Folder Links: SN74LVCZ244A


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