Parallel-to-Serial Converter (Serializer)

A serializer, or parallel-to-serial converter, is a digital component used in high-speed data communication systems. It is a critical part of SerDes (Serializer/Deserializer) architectures, where it takes multiple parallel data bits—typically from a processor or memory bus—and converts them into a single high-speed serial bitstream. This conversion reduces the number of physical channels required for data transmission, such as cables or PCB traces, thereby lowering pin count and minimizing crosstalk. The serializer operates by loading a parallel word of N bits into an internal register on each parallel clock cycle. Using a higher-speed internal clock, typically N times the parallel clock rate, a multiplexer sequentially selects each bit from the register in a predetermined order, outputting them one after another to form the serial stream. Clock and data recovery (CDR) information is often embedded to synchronize the receiver. Typical parameters for such components include a data rate range of 1–12.5 Gbps, an input parallel bus width of 8–32 bits, a supply voltage of 1.8–3.3 V, and power consumption between 50–500 mW at maximum data rate. Operating temperature range is -40 to 85 °C for industrial grade, with humidity limits of 10–90% RH non-condensing. Input logic levels are compatible with LVCMOS 1.8/2.5/3.3 V per JESD8-7, and output differential voltage is 350–700 mV peak-to-peak per V-by-One HS. Random jitter is ≤5 ps RMS at maximum rate. ESD protection is ±2 to ±4 kV HBM per IEC 61000-4-2. Packages include QFN-32 and QFP-48, lead-free and RoHS compliant per JEDEC MS-026. These values are directory reference ranges and must be verified with the manufacturer for specific models. Standards listed are for procurement reference only and do not imply certification.

The serializer loads a parallel word of N bits into an internal register on each parallel clock cycle. Using a higher-speed internal clock (typically N times the parallel clock rate), a multiplexer sequentially selects each bit from the register in a predetermined order, outputting them one after another to form the serial stream. Clock and data recovery (CDR) information is often embedded to synchronize the receiver.