Cypress CY7C1518KV18, CY7C1520KV18, Pin Definitions continued, CY7C1516KV18, CY7C1527KV18

						CY7C1516KV18, CY7C1527KV18
						CY7C1518KV18, CY7C1520KV18
Pin Definitions (continued)
	Pin Name	I/O				Pin Description
	CQ	Output Clock	CQ Referenced with Respect to C. This is a free running clock and is synchronized to the input clock
			for output data (C) of the DDR-II. In the single clock mode, CQ is generated with respect to K. The timing
			for the echo clocks is shown in the AC Timing table.
		Output Clock		Referenced with Respect to		. This is a free running clock and is synchronized to the input clock
			CQ		C
	CQ
			for output data (C) of the DDR-II. In the single clock mode,				CQ	is generated with respect to K. The timing
			for the echo clocks is shown in the AC Timing table.
	ZQ	Input	Output Impedance Matching Input. This input is used to tune the device outputs to the system data bus
			impedance. CQ, CQ, and Q[x:0] output impedance are set to 0.2 x RQ, where RQ is a resistor connected
			between ZQ and ground. Alternatively, this pin can be connected directly to VDDQ, which enables the
			minimum impedance mode. This pin cannot be connected directly to GND or left unconnected.
		Input	PLL Turn Off − Active LOW. Connecting this pin to ground turns off the PLL inside the device. The timing
	DOFF
			in the PLL turned off operation differs from those listed in this data sheet. For normal operation, this pin
			is connected to a pull up through a 10 KΩ or less pull up resistor. The device behaves in DDR-I mode
			when the PLL is turned off. In this mode, the device can be operated at a frequency of up to 167 MHz
			with DDR-I timing.
	TDO	Output	TDO for JTAG.
	TCK	Input	TCK Pin for JTAG.
	TDI	Input	TDI Pin for JTAG.
	TMS	Input	TMS Pin for JTAG.
	NC	N/A	Not Connected to the Die. Can be tied to any voltage level.
	NC/144M	Input	Not Connected to the Die. Can be tied to any voltage level.
	NC/288M	Input	Not Connected to the Die. Can be tied to any voltage level.
	VREF	Input-	Reference Voltage Input. Static input used to set the reference level for HSTL inputs, outputs, and AC
		Reference	measurement points.
	VDD	Power Supply	Power supply Inputs to the Core of the Device.
	VSS	Ground	Ground for the Device.
	VDDQ	Power Supply	Power Supply Inputs for the Outputs of the Device.

Document Number: 001-00437 Rev. *E Page 7 of 30

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