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NLSX4378 Datasheet(PDF) 8 Page - ON Semiconductor |
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NLSX4378 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 9 page NLSX4378 http://onsemi.com 8 APPLICATIONS INFORMATION Level Translator Architecture The NLSX4378 auto sense translator provides bi−directional voltage level shifting to transfer data in multiple supply voltage systems. This device has two supply voltages, VL and VCC, which set the logic levels on the input and output sides of the translator. When used to transfer data from the VL to the VCC ports, input signals referenced to the VL supply are translated to output signals with a logic level matched to VCC. In a similar manner, the VCC to VL translation shifts input signals with a logic level compatible to VCC to an output signal matched to VL. The NLSX4378 consists of two bi−directional channels that independently determine the direction of the data flow without requiring a directional pin. The one−shot circuits are used to detect the rising input signals. In addition, the one shots decrease the rise time of the output signal for low−to−high transitions. Each input/output channel has an internal 10 k W pull. The magnitude of the pullup resistors can be reduced by connecting external resistors in parallel to the internal 10 k W resistors. Input Driver Requirements The rise (tR) and fall (tF) timing parameters of the open drain outputs depend on the magnitude of the pull−up resistors. In addition, the propagation times (tPD), skew (tPSKEW) and maximum data rate depend on the impedance of the device that is connected to the translator. The timing parameters listed in the data sheet assume that the output impedance of the drivers connected to the translator is less than 50 W. Enable Input (EN) The NLSX4378 has an Enable pin (EN) that provides tri−state operation at the I/O pins. Driving the Enable pin to a low logic level minimizes the power consumption of the device and drives the I/O VCC and I/O VL pins to a high impedance state. Normal translation operation occurs when the EN pin is equal to a logic high signal. The EN pin is referenced to the VL supply and has Overvoltage Tolerant (OVT) protection. Power Supply Guidelines During normal operation, supply voltage VL can be greater than, less than or equal to VCC. The sequencing of the power supplies will not damage the device during the power up operation. For optimal performance, 0.01 mF to 0.1 mF decoupling capacitors should be used on the VL and VCC power supply pins. Ceramic capacitors are a good design choice to filter and bypass any noise signals on the voltage lines to the ground plane of the PCB. The noise immunity will be maximized by placing the capacitors as close as possible to the supply and ground pins, along with minimizing the PCB connection traces. ORDERING INFORMATION Device Package Shipping† NLSX4378FCT1G mBump12 (Pb−Free) 3000 / Tape & Reel NLSX4378BFCT1G mBump12 (Backside Laminate Coating) (Pb−Free) 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. |
Similar Part No. - NLSX4378_12 |
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Similar Description - NLSX4378_12 |
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