The SY10/100E446 are integrated 4-bit parallel-to-serial data converters. These devices are designed to operate for NRZ data rates of up to a minimum of 1.3Gb/s. The chips generate 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 parallel data into a serial stream from bit D0 to D3. A serial input is provided to cascade two E446 devices for 8-bit conversion applications. The SYNC input will asynchronously reset the internal clock circuitry. This pin allows the user to reset the internal clock conversion unit and, thus, select the start of the conversion process. The MODE input is used to select the conversion mode of the device.
The SY10E446 and SY100E446 are integrated 4‑bit parallel‑to‑serial data converters designed for NRZ data rates up to 1.3 Gb/s (typical 1.6 Gb/s). They provide divide‑by‑4 and divide‑by‑8 clock outputs, differential serial inputs, and a VBB reference for single‑ended operation. The MODE pin selects 4‑bit or 8‑bit conversion, and the SYNC input allows asynchronous reset of the internal clock.
Electrical specifications include a VEE range of –4.2 V to –5.5 V, power‑supply current around 110 mA, and timing parameters such as a minimum pulse width of 400 ps and reset recovery time of 500 ps. The devices are offered in a 28‑pin PLCC package, with ordering codes SY10E446JC, SY10E446JCTR, SY100E446JC, and SY100E446JCTR. Mechanical drawings and dimensions are provided for the package.
| Typical data rate | 1.6 Gb/s |
|---|---|
| Maximum conversion frequency | 1.6 Gb/s |
| VEE voltage range | -4.2 V to -5.5 V |
| Package | 28‑pin PLCC |
| Minimum pulse width | 400 ps |
| Reset recovery time | 500 ps |
The converters support a typical data rate of up to 1.6 Gb/s, with a guaranteed minimum of 1.3 Gb/s.
Set the MODE input HIGH; this changes the internal clock to divide‑by‑8, allowing two devices to be cascaded for 8‑bit conversion.
Both devices are supplied in a 28‑pin PLCC package.
The VEE range extends from –4.2 V to –5.5 V.