SERDES cuts system cost

The new 14-bit low-voltage differential signaling (LVDS) serializer/deserializer (SERDES) from Texas Instruments Inc. (TI) promises to save system cost and board space in consumer electronics products.

According to the company, the new SN75LVDT1422 full duplex SERDES reduces system space and component requirements by incorporating in a single device a 14-bit serializer and 14-bit deserializer, each operating independently. The serializer accepts 14 transistor-transistor logic (TTL) input lines and generates two LVDS high-speed serial streams plus one LVDS clock signal, while the deserializer accepts three LVDS input signals, including two high-speed serial streams and one LVDS clock signal, and drives out 14 TTL data signals plus one TTL clock. The LVDT1422 provides three termination resistors for the differential LVDS inputs, thereby minimizing cost and board space, while providing better overall signal integrity, added TI.

The LVDT1422 supports a phase-locked loop (PLL) range of 10MHz to 100MHz without needing external PLL components. It is designed for consumer applications requiring bidirectional data flows, such as memory cards where data can be written as well as read. The SERDES also features a &lt360mW (typ) power at 100MHz and power-down mode typical at <500&microW. It supports spread spectrum clocking and reduces cable size, cost and system electromagnetic interference (EMI). In addition, its 175MBps speed in TX/RX modes enables video transfer over distances not possible with TTL, and its inputs and outputs are compatible with TIA/EIA-644 LVDS standard, said TI.

Availability

Rated for operation between the -10°C to 70°C temperature range, the LVDT1422 is available in a Pb-free 64-pin thin quad flat package (TQFP) and has a suggested resale price of $3.70 in 1,000-piece quantities.