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SLYZ022 Datasheet(PDF) 8 Page - Texas Instruments |
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SLYZ022 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 24 page 
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 Submit Documentation Feedback Copyright © 1999–2014, Texas Instruments Incorporated Product Folder Links: SN74LVCZ244A |
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