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CY7C1516KV18, CY7C1527KV18
CY7C1518KV18, CY7C1520KV18
Document Number: 001-00437 Rev. *E Page 7 of 30
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.
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.
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 V
DDQ
, which enables the
minimum impedance mode. This pin cannot be connected directly to GND or left unconnected.
DOFF
Input PLL Turn Off − Active LOW. Connecting this pin to ground turns off the PLL inside the device. The timing
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.
V
REF
Input-
Reference
Reference Voltage Input. Static input used to set the reference level for HSTL inputs, outputs, and AC
measurement points.
V
DD
Power Supply Power supply Inputs to the Core of the Device.
V
SS
Ground Ground for the Device.
V
DDQ
Power Supply Power Supply Inputs for the Outputs of the Device.
Pin Definitions (continued)
Pin Name I/O Pin Description
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