Filter
Top Products
CY7C1546V18, CY7C1557V18
CY7C1548V18, CY7C1550V18
Document Number: 001-06550 Rev. *E 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. Alternatively, this pin is connected directly to V
DDQ
and enables
the minimum impedance mode. This pin is not 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 DLL turned off operation is different from that listed in this datasheet. For normal
operation, this pin is connected to a pull up through a 10 Kohm or less pull up resistor. The device
behaves in DDR-I mode when the DLL is turned off. In this mode, the device is operated at a
frequency of up to 167 MHz with DDR-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. Is tied to any voltage level.
NC/72M N/A Not Connected to the Die. Is tied to any voltage level.
NC/144M N/A Not Connected to the Die. Is tied to any voltage level.
NC/288M N/A Not Connected to the Die. Is tied to any voltage level.
V
REF
Input
Reference
Reference Voltage Input. Static input is 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
[+] Feedback [+] Feedback