Pin definitions – Cypress CY7C1415JV18 User Manual
Page 7
CY7C1411JV18, CY7C1426JV18
CY7C1413JV18, CY7C1415JV18
Document Number: 001-12557 Rev. *C
Page 7 of 28
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 the single clock mode, CQ is generated with respect to K. The timings
for the echo clocks are shown in the AC timing table.
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 the single clock mode, CQ is generated with respect to K. The timings
for the echo clocks are 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
DLL Turn Off
− Active LOW. Connecting this pin to ground turns off the DLL inside the device. The
timings in the DLL turned off operation differs from those listed in this data sheet. For normal operation,
this pin can be connected 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.
NC/72M
N/A
Not Connected to the Die. Can be tied to any voltage level.
NC/144M
N/A
Not Connected to the Die. Can be tied to any voltage level.
NC/288M
N/A
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