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ADG3241BKS-REEL7 Datasheet(PDF) 10 Page - Analog Devices |
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ADG3241BKS-REEL7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page REV. A –10– ADG3241 Bus Isolation A common requirement of bus architectures is low capacitance loading of the bus. Such systems require bus bridge devices that extend the number of loads on the bus without exceeding the specifications. Because the ADG3241 is designed specifically for applications that do not need drive yet require simple logic functions, it solves this requirement. The device isolates access to the bus, thus minimizing capacitance loading. BUS/ BACKPLANE LOAD A LOAD C LOAD B LOAD D BUS SWITCH LOCATION Figure 11. Location of Bus Switched in a Bus Isolation Application Hot Plug and Hot Swap Isolation The ADG3241 is suitable for hot swap and hot plug applications. The output signal of the ADG3241 is limited to a voltage that is below the VCC supply, as shown in Figures 6, 8, and 10. Therefore the switch acts like a buffer to take the impact from hot insertion, protecting vital and expensive chipsets from damage. In hot plug applications, the system cannot be shut down when new hardware is being added. To overcome this, a bus switch can be positioned on the backplane between the bus devices and the hot plug connectors. The bus switch is turned off during hot plug. Figure 12 shows a typical example of this type of application. PLUG-IN CARD (1) CARD I/O CARD I/O RAM CPU PLUG-IN CARD (2) Figure 12. ADG3241 in a Hot Plug Application There are many systems, such as docking stations, PCI boards for servers, and line cards for telecommunications switches, that require the ability to handle hot swapping. If the bus can be isolated prior to insertion or removal, there is more control over the hot swap event. This isolation can be achieved using bus switches. The bus switches are positioned on the hot swap card between the connector and the devices. During hot swap, the ground pin of the hot swap card must connect to the ground pin of the backplane before any other signal or power pins. Analog Switching Bus switches can be used in many analog switching applications, for example, video graphics. Bus switches can have lower on resistance, smaller ON and OFF channel capacitance, and thus improved frequency performance than their analog counterparts. The bus switch channel itself, consisting solely of an NMOS switch, limits the operating voltage (see TPC 1 for a typical plot), but in many cases, this does not present an issue. High Impedance During Power-Up/Power-Down To ensure the high impedance state during power-up or power- down, BE should be tied to V CC through a pull-up resistor; the minimum value of the resistor is determined by the current- sinking capability of the driver. |
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