LTC1686CS8#PBF

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The LTC1686CS8#PBF, produced by Linear Technology Corporation, is an 8-bit serial/parallel-in, parallel/serial-out shift register with a clock buffer. It is a member of the large LTC1686 mixed-signal transceiver family. The transceiver is designed to convert 8-bit parallel data to a serial format or vice-versa, enabling high-speed data exchanges. As the driving force behind interfaces, this device clearly belongs to the classification of Drivers, Receivers, Transceivers.

The features of the LTC1686CS8#PBF that make it especially suitable for this application field include its high data rate - up to 95 megabits per second (Mb/s), wide supply voltage range of 2.25V to 5.5V, low power consumption of 130mW with a 5V supply, high slew rate, ESD protection of > 12kV, and low propagation delay times (500ps typical) . Combined, these features make the device optimal for touchscreen controllers, consumer electronics, low-speed a/d converters and other applications requiring high data rates.

As for the transceiver\'s working principle, this device is based upon the popular “4-wire SPI” serial protocol. SPI bus, which is short for serial peripheral interface bus, is a full-duplex synchronous serial communication interface used to send and receive data at high speeds on short distances. While 4-wire SPI adds an extra wire over the typical 3-wire format to facilitate more efficient bidirectional data transfers by simultaneously making data available while loading new data.

The LTC1686CS8#PBF is designed to incorporate the same transceiver logic and protocol, with 8-bits of data being transferred serially in and out on two signal lines. The clock signal, named CLK or CLKOUT, synchronizes the data transfers over the data lines, called DIN and DOUT. The CLK signal must be supplied from an external source, whereas the DIN and DOUT signals are provided by the transceiver itself.

As the DIN signal is driven serially into the transceiver, the 8-bit parallel data is shifted out simultaneously on the DOUT line (while being “clocked in” at a rate determined by the CLK signal). Conversely, in the serial to parallel application, the data is shifted into the LTC1686CS8#PBF through the DIN line while the parallel-converted data is shifted out over the DOUT line.

Additional logic functions – such as a serial data output reset, dual 8-bit parallel outputs enabling parallel output latching, and the ability to select between buffered and unbuffered clock output (CLKOUT) – further enhance the functionality of this transceiver.

In summary, the LTC1686CS8#PBF is an ideal example of a device specifically designed to interface between digital circuits that use different formats and/or speeds. Its 8-bit data capability, high-speed data transfers, low power consumption, and ESD protection make it well-suited for a variety of interface applications, such as touchscreen controllers, consumer electronics, and low-speed a/d converters.

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