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SMH4042A Datasheet(PDF) 19 Page - Summit Microelectronics, Inc. |
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SMH4042A Datasheet(HTML) 19 Page - Summit Microelectronics, Inc. |
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19 / 28 page  2070 9.1 5/27/03 SMH4042A SUMMIT MICROELECTRONICS, Inc. 19 I/O Buffers Depending upon the application requirements there are a number of silicon solutions that employ low on-resistance CMOS switches. Figure 15 shows one implementation using a QuickSwitch® from Quality Semiconductor. This particular device exhibits very Flat RON characteristics from 0 to 5V. The only drawback is the extra space required for the external pull-up resistors. Figure 16 shows another implementation, but the pull-up resistor structure is incorporated in the switch. The circuit also automatically switches the bias voltage out of the circuit as the CMOS switches are enabled. A potential advantage is the ability to place the interface closer to the edge of the card. The board designer should evaluate requirements and design goals to determine the best solution. The bus switches are available from both Texas Instruments and Pericom Semiconductor. Figure 15. Bus Buffers with External Pull-ups Figure 16. Bus Buffers with Integrated Pull-ups OE# LMV321 2070 Fig15 An Bn Ax Bx SGNL_VLD# 1VREF SMH4042A IDTQS34XVH245 Early Power ON# LMV321 2070 Fig16 An Bn Ax Bx SGNL_VLD# 1VREF SMH4042A SN74CBT6800 or PI5C6800 BIASV Early Power |
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Similar Description - SMH4042A |
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