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ISL54230IRTZ-T Arkusz danych(PDF) 9 Page - Intersil Corporation |
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ISL54230IRTZ-T Arkusz danych(HTML) 9 Page - Intersil Corporation |
9 / 18 page 9 FN6825.2 May 28, 2009 Detailed Description The ISL54230 is a multiprotocol switch containing eight switches configured as a Quad DPDT. Each DPDT switch is independently controlled by a logic pin. The ISL54230 has four switches that are compliant in passing USB2.0 signals and four switches with low rON that can be used to pass analog or digital signals such as audio or UART. It is offered in a 36 ball WLCSP or a 32 Ld 5mmx5mm TQFN package for applications which require small package size such as cellphones and PDAs. The ISL54230 contains four switches capable of passing USB2.0 Full-Speed and High-Speed signals with minimal distortion, two 1 Ω switches and two 6Ω switches for analog/digital signals. The USB capable switches were designed with low capacitance and high bandwidth to pass USB HS signals (480Mbps) with minimal edge and phase distortion. The 1 Ω switches are designed for passing low bandwidth signals (<8MHz) and are ideal for switching power lines since the low ON-resistance minimizes power dissipation. The 6 Ω switches are designed to pass audio or data signals up to 100MHz while maintaining a low rON for good THD performance. In addition to the four independent logic control pins that control each DPDT switch, the ISL54230 contains two Output Enable (OE) logic pins that permits the IC to disable certain switches giving the user a high degree of flexibility in signal routing. Please see “OE Control Truth Table” on page 3 for an explanation of the OE pins. All logic pins on the ISL54230 are 1.8V logic compatible up to a +3.3V supply. Power Supply Considerations The power supply connected to the VDD and GND pins provides the DC bias voltage necessary to operate the IC. The ISL54230 can be operated with a supply voltage in the range of +2.0V to +5.5V. For USB applications, the supply voltage should be in the range of +3.0V to +5.5V to ensure proper signal levels on the USB data lines. A decoupling capacitor in the range 0.01µF to 0.1µF should be connected to the VDD supply pin of the IC to filter out any power supply noise that may be present on the supply lines. The capacitor should be place as closed as possible to the VDD pin. Supply Sequencing and Power-On Reset Protection Proper power supply sequencing is necessary to protect the ISL54230 from operating in fault conditions. The ISL54230 integrates Power-On Reset (POR) circuitry that prevents the switches from turning ON until the supply voltage is at least +1.4V. The POR has a 100mV hysteresis built in that will turn the switches OFF when the supply has gone below +1.3V. This function prevents signals from the switch input being passed to the output when the device operating voltage has not reached appropriate levels yet, protecting the switch from fault conditions. The POR circuitry also protects the switch from operating in a fault condition should the power supply to the IC drop below the POR threshold. Thus, the recommended operational supply voltage is within +2.0V to +5.5V. Operating at supply voltages below +2.0V may still be functional but the noise margin between the POR threshold and supply voltage will be reduced. The device may FIGURE 6A. MEASUREMENT POINTS FIGURE 6B. TEST CIRCUIT FIGURE 6. SKEW TEST Test Circuits and Waveforms (Continued) DIN+ DIN- OUT+ OUT- 50% 50% 90% 10% 10% 10% 10% 90% 90% 50% 90% 50% tri tfi tro tf0 tskew_i tskew_o OUT+ CL COM2B NO2A GND VDD C COM2A CL OUT- DIN+ DIN- |tro - tri| Delay Due to Switch for Rising Input and Rising Output Signals. |tfo - tfi| Delay Due to Switch for Falling Input and Falling Output Signals |tskew_0| Change in Skew through the Switch for Output Signals. |tskew_i| Change in Skew through the Switch for Input Signals. 15.8 Ω 15.8 Ω 143 Ω 143 Ω 45 Ω 45 Ω INx VINx OR NC2A NO2B OR NC2B ISL54230 |
Podobny numer części - ISL54230IRTZ-T |
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Podobny opis - ISL54230IRTZ-T |
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