The SY89874U is a low-skew, low-jitter integrated programmable clock divider and 1:2 buffer from Micrel. This device can accept high-speed (e.g., 622MHz or higher) CML, LVPECL, LVDS or HSTL clock input signals and divide down the frequency using a programmable divider ratio to create a frequency-locked, lower speed version of the input clock. Available divider ratios are 2, 4, 8 and 16, or straight pass-through. In a typical 622MHz clock system this would provide availability of 311MHz, 155MHz, 77MHz or 38MHz auxiliary clock outputs.
The SY89874U Precision Edge device from Micrel provides a programmable clock divider and 1:2 fan‑out buffer with internal termination for LVPECL, CML, LVDS, and HSTL inputs. It supports divider ratios of 1, 2, 4, 8 and 16, low‑jitter performance (<10 pspp total jitter) and can operate from a 2.5 V or 3.3 V supply.
The part is offered in a 16‑pin MicroLeadFrame (MLF‑16) package and includes features such as TTL/CMOS select and reset pins, output disable, and parallel programming capability. Typical applications include SONET/SDH line cards, transponders and high‑end multiprocessor sensors.
| Supply voltage | 2.5 V or 3.3 V |
|---|---|
| Operating temperature range | -40 °C to +85 °C |
| Programmable divider ratios | 1, 2, 4, 8, 16 |
| Maximum output toggle frequency | 2.5 GHz (>400 mV swing) |
| Maximum input frequency | 3.2 GHz (divide‑by‑2, 4, 8, 16) |
| Package type | 16‑pin MLF (8 mm × 3 mm) |
It supports programmable divider ratios of 1, 2, 4, 8 and 16.
The device is supplied in a 16‑pin MicroLeadFrame (MLF‑16) package.
The SY89874U can be powered from either 2.5 V or 3.3 V supplies.
It operates from –40 °C up to +85 °C.