CY7C1510JV18, CY7C1525JV18
CY7C1512JV18, CY7C1514JV18
Document #: 001-14435 Rev. *C
Page 7 of 26
CQ
Echo Clock
CQ is Referenced with Respect to C
. This is a free-running clock and is synchronized to the input clock
for output data (C) of the QDR-II. In single clock mode, CQ is generated with respect to K. The timing for
the echo clocks is shown in
Switching Characteristics
on page 22.
CQ
Echo Clock
CQ is Referenced with Respect to C
. This is a free-running clock and is synchronized to the input clock
for output data (C) of the QDR-II. In single clock mode, CQ is generated with respect to K. The timing for
the echo clocks is shown in the
Switching Characteristics
on page 22.
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, connect this pin directly to V
DDQ
, which enables the minimum
impedance mode. This pin cannot be connected directly to GND or left unconnected.
DOFF
Input
DLL Turn Off
−
Active LOW
. Connecting this pin to ground turns off the DLL inside the device. The timing
in the operation with the DLL turned off differs from those listed in this data sheet. For normal operation,
connect this pin to a pull up through a 10 K
Ω
or less pull up resistor. The device behaves in QDR-I mode
when the DLL is turned off. In this mode, the device can be operated at a frequency of up to 167 MHz
with QDR-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.
V
SS
/144M
Input
Not Connected to the Die
. Can be tied to any voltage level.
V
SS
/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
IO
Pin Description
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