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PI4ULS3V204 Datasheet(PDF) 11 Page - Pericom Semiconductor Corporation |
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PI4ULS3V204 Datasheet(HTML) 11 Page - Pericom Semiconductor Corporation |
11 / 14 page ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2015-07-0031 PT0511-2 08/18/15 11 PI4ULS3V204 4-Bit Bi-directional Level Shifter for Open-drain and Push-pull Application 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 kΩ. Enable Input (EN) The PI4ULS3V204 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 VCCB and I/O VCCA 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 VCCA supply and has overvoltage tolerant protection. Power Supply Guidelines During normal operation, supply voltage VCCA can be greater than, less than or equal to VCCB. The sequencing of the power supplies will not damage the device during the power up operation. For optimal performance, 0.01μF to 0.1μF decoupling capacitors should be used on the VCCA and VCCB 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. |
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