DallasTexas Instruments Inc. latest addition to its Widebus+ family, the SN74LV4320A, is a low-cost level translating device for interfacing core processors to compact flash memory cards in consumer electronics applications.
Designed for the processor-to-CompactFlash interface, the SN74LV4320A single-chip transceiver is a low-power, dual-supply, level-translating device with 16-bit data, 11-bit address and 13-bit control lines.
It has separate Vcc rails for the system side bus and the CompactFlash connector bus, allowing voltage-level shifting. This is helpful for interfacing between a core chipset, which may operate from 3.3 V down to 1.65 V, and CF cards, which operate from 3.3-V or 5-V supply voltages.
The device also supports low-power operation by incorporating Ioff and a /MASTER_EN (shutdown) Pin.
According to TI, current interface methods are cumbersome in size and cost. Conventional devices typically consist of two 16-bit transceivers, as well as card-detect logic and several pull-up resistors. That method may have high risk of floating inputs on the card side, which could affect power consumption.
TI's SN74LV4320A transceiver eliminates such issues by providing low-power. In addition, all the input buffers feature the input-disable function, which allows conditional floating input signals. The input, output, and I/O buffers on the CompactFlash connector side have been defined to comply with CF+ and CompactFlash specification revisions 1.4 and 2.0
ESD protection at ±8kV on card-side pins helps prevent damage as CompactFlash cards are inserted and removed from their sockets. Pin assignments of the LV4320A are optimized to enable a flow-through pinout from the processor to the CompactFlash card.
The SN74LV4320A transceiver is packaged in a 114-pin BGA, and costs $3.85 each in quantities of 1,000.
For more information, see TI's datasheet: focus.ti.com/lit/ds/symlink/sn74lv4320a.pdf.
Texas Instruments Inc., 1-972-644-5580, www.ti.com.