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CY7C25702KV18-500BZC Datasheet(PDF) 6 Page - Cypress Semiconductor |
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CY7C25702KV18-500BZC Datasheet(HTML) 6 Page - Cypress Semiconductor |
6 / 29 page CY7C25682KV18 CY7C25702KV18 Document Number: 001-66483 Rev. *B Page 6 of 29 CQ Echo Clock Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input clock (K) of the DDR II+. The timing for the echo clocks is shown in the Switching Characteristics on page 23. CQ Echo Clock Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input clock (K) of the DDR II+. The timing for the echo clocks is shown in the Switching Characteristics on page 23. 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 × RQ, where RQ is a resistor connected between ZQ and ground. Alternatively, this pin can be connected directly to VDDQ, which enables the minimum impedance mode. This pin cannot be connected directly to GND or left unconnected. DOFF Input PLL Turn Off Active LOW. Connecting this pin to ground turns off the PLL inside the device. The timing in the PLL 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 or less pull up resistor. The device behaves in DDR I mode when the PLL is turned off. In this mode, the device can be operated at a frequency of up to 167 MHz with DDR I timing. TDO Output TDO Pin 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 Input Not Connected to the Die. Can be tied to any voltage level. NC/288M Input Not Connected to the Die. Can be tied to any voltage level. VREF Input- Reference Reference Voltage Input. Static input used to set the reference level for HSTL inputs, outputs, and AC measurement points. VDD Power Supply Power Supply Inputs to the Core of the Device. VSS Ground Ground for the Device. VDDQ Power Supply Power Supply Inputs for the Outputs of the Device. Pin Definitions (continued) Pin Name I/O Pin Description |
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