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ISL54222IRUZ-T Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL54222IRUZ-T Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 15 page 7 FN6835.0 February 9, 2009 Application Block Diagram Detailed Description The ISL54222 device is a dual single pole/double throw (SPDT) analog switch configured as a DPDT that operates from a single DC power supply in the range of 1.8V to 3.3V. It was designed to function as a dual 2-to-1 multiplexer to select between two USB high-speed differential data signals in portable battery powered products. It is offered in a TDFN, MSOP, and a small µTQFN packages for use in MP3 players, cameras, PDAs, cellphones, and other personal media players. The device has an enable pin to open all switches. The part consists of four 5.5 Ω high speed (HSx) switches. These switches have high bandwidth and low capacitance to pass USB high-speed (480Mbps) differential data signals with minimal edge and phase distortion. They can also swing from 0V to VDD to pass USB full speed (12Mbps) differential data signals with minimal distortion. The ISL54222 was designed for MP3 players, cameras, cellphones, and other personal media player applications that have multiple high-speed or full-speed transceivers sections and need to multiplex between these USB sources to a single USB host (computer). A typical application block diagram of this functionality is previously shown. A detailed description of the HS switches is provided in the following section. High-Speed (HSx) Switches The HSx switches (HSD1-, HSD1+, HSD2-, HSD2+) are bi-directional switches that can pass rail-to-rail signals. When powered with a 1.8V supply, these switches have a nominal rON of 5.5Ω over the signal range of 0V to 400mV with a rON flatness of 0.44Ω. The rON matching between the HSD1 and HSD2 switches over this signal range is only 0.072 Ω, ensuring minimal impact by the switches to USB high speed signal transitions. As the signal level increases, the rON switch resistance increases. At signal level of 1.8V, the switch resistance is nominally 12 Ω. See Figures 7, 8, 9, 10, 11, 12 in the “Typical Performance Curves” beginning on page 9. The HSx switches were specifically designed to pass USB 2.0 high-speed (480Mbps) differential signals in the range of 0V to 400mV. They have low capacitance (6.5pF) and high bandwidth to pass the USB high-speed signals with minimum edge and phase distortion to meet USB 2.0 high speed signal quality specifications. See Figure 13 in the “Typical Performance Curves” on page 10 for USB High-speed Eye Pattern taken with switches in the differential signal paths. The HSx switches can also pass USB full-speed signals (12Mbps) with minimal distortion and meet all the USB requirements for USB 2.0 full-speed signaling. See Figure 14 and 15 in the “Typical Performance Curves” on page 11 for USB Full-speed Eye Pattern taken with switches in the differential signal paths. The maximum normal operating signal range for the HSx switches is from 0V to VDD. The signal voltage should not be allow to exceed the VDD voltage rail or go below ground by more than -0.3V for normal operation. However, in the event that the USB 5.25V VBUS voltage gets shorted to one or both of the D-/D+ pins, the ISL54222 has special fault protection circuitry to prevent damage to the ISL54222 part. The fault circuitry allows the signal pins (D-, D+, HSD1-, HSD1+, HSD2-, HSD2+) to be driven up to 5.5V while the VDD supply voltage is in the range of 0V to 3.3V. In this condition the part draws < 300µA of IDD current and causes no stress to the IC. In addition when VDD is at 0V (ground) all switches are OFF and the fault voltage is isolated from the other side of the switch. When VDD is in the PORTABLE MEDIA DEVICE ISL54222 USB TRANSCEIVER HIGH-SPEED D- D+ SEL GND HSD1- HSD1+ HSD2- HSD2+ VDD OE LOGIC CIRCUITRY µCONTROLLER USB TRANSCEIVER FULL-SPEED VBUS D- D+ GND OR FULL-SPEED HIGH_SPEED OR #1 #2 ISL54222 |
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