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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ISL54225 Arkusz danych(PDF) 9 Page - Intersil Corporation |
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ISL54225 Arkusz danych(HTML) 9 Page - Intersil Corporation |
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9 / 18 page  9 FN7627.0 July 2, 2010 Application Block Diagram Detailed Description The ISL54225 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 2.7V to 5.25V. 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, 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 and put the part in a low power state. The part contains special overvoltage detection and protection (OVP) circuitry on the D-/D+ COM pins. This circuitry acts to open the USB in-line switches when the part senses a voltage on the COM pins that is >3.8V (typ) or < -0.5V (typ). It isolates voltages up to 5.25V and down to -5V from getting through to the other side of the switch to protect the USB transceivers connected at the signal pins (HSD1-, HSD1+, HSD2-, HSD2+). The part consists of four 6.5Ω 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 3.6V to pass USB full speed (12Mbps) differential data signals with minimal distortion. The ISL54225 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) Data Switches The HSx switches (HSD1-, HSD1+, HSD2-, HSD2+) are bi-directional switches that can pass USB high-speed and USB full-speed signals when VDD is in the range of 2.7V to 5.25V. When powered with a 2.7V supply, these switches have a nominal rON of 6.5Ω over the signal range of 0V to 400mV with a rON flatness of 0.3Ω. The rON matching between the HSD1x switches and HSD2x switches over this signal range is only 0.2Ω, 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 3.3V, the switch resistance is nominally 12Ω. See Figures 9, 10, 11, 12, 13, 14, 15 and 16 in the “Typical Performance Curves” beginning on page 12. 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 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 21 in the “Typical Performance Curves” on page 14 for USB High-speed Eye Pattern taken with switch in the signal path. 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 22 in the “Typical Performance Curves” on page 14 for USB Full-speed Eye Pattern taken with switch in the signal path. PORTABLE MEDIA DEVICE ISL54225 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 OVP #1 #2 4MΩ 4MΩ 500Ω VDD ISL54225 |
Podobny numer części - ISL54225 |
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