Pin definitions – Cypress Perform CY7C1561V18 User Manual
Page 7
CY7C1561V18, CY7C1576V18
CY7C1563V18, CY7C1565V18
Document Number: 001-05384 Rev. *F
Page 7 of 28
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. Alternately, 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 are different 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/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 and Outputs as
well as 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