Cypress CY7C1565V18 Manual De Usuario

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

− 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.

 (continued)