CY2305C

The CY2305C and CY2309C are die replacement parts for CY2305 and CY2309.

The CY2305C is a low-cost 3.3V zero delay buffer designed to distribute high-speed clocks and is available in a 16-pin SOIC or TSSOP package. The CY2305C is an 8-pin version of the CY2309C. It accepts one reference input, and drives out five low-skew clocks. The -1H versions of each device operate at up to 100-/133-MHz frequencies, and have higher drive than the -1 devices. All parts have on-chip PLLs which lock to an input clock on the REF pin. The PLL feedback is on-chip and is obtained from the CLKOUT pad.

The CY2305C has two banks of four outputs each, which can be controlled by the Select inputs as shown in the "Select Input Decoding" table on page 2. If all output clocks are not required, BankB can be three-stated. The select inputs also allow the input clock to be directly applied to the outputs for chip and system testing purposes.

The CY2305C and CY2309C PLLs enter a power-down mode when there are no rising edges on the REF input. In this state, the outputs are three-stated and the PLL is turned off, resulting in less than 12.0 A of current draw for commercial temperature devices and 25.0 A for industrial temperature parts. The CY2309C PLL shuts down in one additional case as shown in the table below.

In the special case when S2:S1 is 1:0, the PLL is bypassed and REF is output from DC to the maximum allowable frequency. The part behaves like a non-zero delay buffer in this mode, and the outputs are not tri-stated.

The CY2305C/CY2309C is available in two/three different configurations, as shown in the Ordering Information Table. The CY2305C-1/CY2309C-1 is the base part. The CY2305-1H/ CY2309-1H is the high-drive version of the -1, and its rise and fall times are much faster than the -1s.

These parts are not intended for 5V input-tolerant applications.