CY7C1516KV18, CY7C1527KV18

CY7C1518KV18, CY7C1520KV18

Document Number: 001-00437 Rev. *J

Page 8 of 33

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

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 K

Ω 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

Test data out (TDO) for JTAG

TCK

Input

Test clock (TCK) pin for JTAG

TDI

Input

Test data in (TDI) pin for JTAG

TMS

Input

Test mode select (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.

Input-

Reference

Reference voltage input. Static input used to set the reference level for HSTL inputs, outputs, and AC

measurement points.

Power Supply Power supply Inputs to the core of the device.

Ground

Ground for the device.

Power Supply Power supply inputs for the outputs of the device.

Pin Name

I/O

Pin Description

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