DESCRIPTION:

The QS5LV919 Clock Driver uses an internal phase locked loop (PLL) to lock low skew outputs to one of two reference clock inputs. Eight outputs are available: 2xQ, Q0-Q4, Q5, Q/2. Careful layout and design ensure < 300 ps skew between the Q0-Q4, and Q/2 outputs. The QS5LV919 includes an internal RC filter which provides excellent jitter characteristics and eliminates the need for external components. Various combinations of feedback and a divide-by-2 in the VCO path allow applications to be customized for linear VCO operation over a wide range of input SYNC frequencies. The PLL can also be disabled by the PLL_EN signal to allow low frequency or DC testing. The LOCK output asserts to indicate when phase lock has been achieved. The QS5LV919 is designed for use in high-performance workstations, multiboard computers, networking hardware, and mainframe systems. Several can be used in parallel or scattered throughout a system for guaranteed low skew, system-wide clock distribution networks.

For more information on PLL clock driver products, see Application Note AN-227.

FEATURES:

• 3.3V operation

• JEDEC compatible LVTTL level outputs

• Clock inputs are 5V tolerant

• < 300ps output skew, Q0–Q4

• 2xQ output, Q outputs, Q output, Q/2 output

• Outputs 3-state and reset while OE/RST low

• PLL disable feature for low frequency testing

• Internal loop filter RC network

• Functional equivalent to MC88LV915, IDT74FCT388915

• Positive or negative edge synchronization (PE)

• Balanced drive outputs ±24mA

• 160MHz maximum frequency (2xQ output)

• Available in QSOP and PLCC packages