The SY10/100E445 are integrated 4-bit serial-to-parallel data converters. The devices are designed to operate for NRZ data rates of up to 2.5Gb/s. The chip generates a divide-by-4 and a divide-by-8 clock for both 4-bit conversion and a two-chip 8-bit conversion function. The conversion sequence was chosen to convert the first serial bit to Q0, the second to Q1, etc. Two selectable serial inputs provide a loopback capability for testing purposes when the device is used in conjunction with the E446 parallel-to-serial converter. The start bit for conversion can be moved using the SYNC input. When asynchronously applied for a period of time, a single pulse will lock the conversion to the selected input.
The SY10E445 and SY100E445 are 4‑bit serial‑to‑parallel converters designed for high‑speed NRZ data rates up to 2.5 Gb/s. They feature differential serial inputs, on‑chip clock generation (÷4 and ÷8), a VBB reference for single‑ended operation, and a MODE pin that enables an 8‑bit conversion scheme when cascaded.
The document provides detailed pin configurations, electrical characteristics, timing diagrams, and application information such as loop‑back testing and cascading two devices to form a 1:8 demultiplexer. Ordering information and mechanical dimensions are also included.
| Maximum data rate | 2.5 Gb/s |
|---|---|
| VEE voltage range | -4.2 V to -5.5 V |
| Input HIGH current | 150 µA |
| Package type | 28‑pin PLCC |
| Internal pull‑down resistor | 75 kΩ |
The devices support NRZ data rates up to 2.5 Gb/s.
Drive the MODE input HIGH; the output then changes on every eighth clock cycle for 8‑bit conversion.
The VEE range is from –4.2 V to –5.5 V.
Both parts are available in a 28‑pin PLCC package.