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ISL54233IRUZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL54233IRUZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 18 page ISL54233 8 FN7918.0 December 21, 2011 Application Block Diagram Detailed Description The ISL54233 device consists of dual SP3T (single pole/triple throw) analog switches. It operates from a single DC power supply in the range of 2.7V to 4.6V. It was designed to function as a differential 3 to 1 multiplexer to select between three different differential data signals. It is offered in tiny UTQFN and TQFN packages for use in MP3 players, PDAs, cellphones, and other personal media players. The device consists of six 6Ω data switches. It was designed to pass high-speed USB differential data and digital video signals with minimal edge and phase distortion. It can swing rail-to-rail to pass UART and full-speed USB signals. The COM pins can accept signals that swing below ground by as much as -2V. This allows an audio source to be wired-OR connected at the COM pins. The ISL54233 was specifically designed for MP3 players, personal media players and cellphone applications that need to combine three differential data channels into a single shared connector, thereby saving space and component cost. This functionality is shown in the Typical Application Block Diagram on page 1. A detailed description of the switches is provided in the following sections. Data Switches The six data switches (1D+, 1D-, 2D+, 2D-, 3D+, 3D-) are 6Ω bidirectional switches that were specifically designed to pass high-speed USB differential data signals in the range of 0V to 400mV. The switches have low capacitance and high bandwidth to pass USB high-speed signals (480Mbps) with minimum edge and phase distortion to meet USB 2.0 signal quality specifications. See Figures 15 and 16 for high-speed Eye Pattern taken with the switch in the signal path. These switches can also swing rail-to-rail and pass USB full-speed (12Mbps) and UART signals with minimal distortion. See Figure 17 for USB full-speed Eye Pattern taken with the switch in the signal path. The maximum normal operating signal range for the USB switches is from -1V to VDD. The signal voltage at D- and D+ should not be allowed to exceed the VDD voltage rail or go below ground by more than -1V for normal operation. Fault Protection and Power-Off Protection However, in the event that the USB 5.25V VBUS voltage were shorted to one or both of the COM pins, the ISL54233 has fault protection circuitry to prevent damage to the ISL54233 part. The fault circuitry allows the signal pins (COM-, COM+, 1D-, 1D+, 2D-, 2D+, 3D-, 3D+) to be driven up to 5.25V while the VDD supply voltage is in the range of 0V to 4.6V. This fault condition 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 (Power-Off Protection). When VDD is in the range of 2.7V to 4.6V, the fault voltage will pass through to the output of an active switch channel. Note: During the fault condition, normal operation is not guaranteed until the fault condition is removed. ISL54233 Operation The discussion that follows will discuss using the ISL54233 in the “Application Block Diagram” on page 8. ISL54233 DIGITAL VIDEO UART COM - COM + C1 GND 1D+ 1D- 2D+ 2D- VDD C0 LOGIC CONTROL µCONTROLLER VBUS 3.3V 3D- USB 4MΩ TRANSCEIVER 3D+ AUDIO CODEC ISL54406 HEAD PHONE JACK 100Ω |
Similar Part No. - ISL54233IRUZ-T |
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Similar Description - ISL54233IRUZ-T |
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