0NZCY2310 14ANZ CY2314ANZ 14 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs Features Functional Description • One input to 14 output buffer/driver • Supports up to three SDRAM DIMMs • Two additional outputs for feedback • Serial interface for output control • Low skew outputs • Up to 100-MHz operation • Multiple VDD and VSS pins for noise reduction • Dedicated OE pin for testing • Low EMI outputs • 28-pin SOIC (300-mil) package The CY2314ANZ is a 3.3V buffer designed to distribute high-speed clocks in desktop PC applications. The part has 14 outputs, 12 of which can be used to drive up to three SDRAM DIMMs, and the remaining can be used for external feedback to a PLL. The device operates at 3.3V and outputs can run up to 100 MHz, thus making it compatible with Pentium® II processors. The CY2314ANZ can be used in conjunction with the CY2280, CY2281, CY2282 or similar clock synthesizer for a complete Pentium II motherboard solution. The CY2314ANZ also includes a serial interface which can enable or disable each output clock. On power-up, all output clocks are enabled. A separate Output Enable pin facilitates testing on ATE. • 3.3V operation Block Diagram Pin Configuration 28-pin SOIC Top View BUF_IN SDRAM0 SDRAM1 SDRAM2 SDRAM3 SDATA SDRAM4 SDRAM5 SDRAM6 SDRAM7 SDRAM8 SDRAM9 SDRAM10 SDRAM11 SDRAM12 Serial Interface Decoding SCLOCK VDD SDRAM0 SDRAM1 VSS VDD SDRAM2 SDRAM3 VSS BUF_IN SDRAM4 SDRAM5 SDRAM12 VDDIIC SDATA 1 2 28 27 3 4 26 25 5 24 6 23 7 22 8 9 21 20 10 19 11 18 12 17 13 14 16 15 VDD SDRAM11 SDRAM10 VSS VDD SDRAM9 SDRAM8 VSS OE SDRAM7 SDRAM6 SDRAM13 VSSIIC SCLK SDRAM13 OE Pentium is a registered trademark of Intel Corporation. Cypress Semiconductor Corporation Document #: 38-07143 Rev. *A • 3901 North First Street • San Jose • CA 95134 • 408-943-2600 Revised December 14, 2002 CY2314ANZ Pin Summary Name Pins Description VDD 1, 5, 24, 28 3.3V Digital voltage supply VSS 4, 8, 21, 25 Ground VDDIIC 13 Serial interface voltage supply VSSIIC 16 Ground for serial interface BUF_IN 9 Input clock OE 20 Output Enable, three-states outputs when LOW. Internal pull-up to VDD SDATA 14 Serial data input, internal pull-up to VDD SCLK 15 Serial clock input, internal pull-up to VDD SDRAM [0-13] 2, 3, 6, 7, 10, 11, 18, 19, 22, 23, 26, 27, 12, 17 SDRAM clock outputs Device Functionality OE SDRAM [0-13] 0 High-Z 1 1 x BUF_IN Serial Configuration Map • The Serial bits will be read by the clock driver in the following order: Byte 0 - Bits 7, 6, 5, 4, 3, 2, 1, 0 Byte 1: SDRAM Active/Inactive Register (1 = Active, 0 = Inactive), Default = Active Bit Byte 1 - Bits 7, 6, 5, 4, 3, 2, 1, 0 . Byte N - Bits 7, 6, 5, 4, 3, 2, 1, 0 • Reserved and unused bits should be programmed to “0” • Serial interface address for the CY2314ANZ is: Pin # Description Bit 7 27 SDRAM11 (Active/Inactive) Bit 6 26 SDRAM10 (Active/Inactive) Bit 5 23 SDRAM9 (Active/Inactive) Bit 4 22 SDRAM8 (Active/Inactive) -- Reserved, drive to 0 A6 A5 A4 A3 A2 A1 A0 R/W Bit 3 1 1 0 1 0 0 1 ---- Bit 2 -- Reserved, drive to 0 Bit 1 19 SDRAM7 (Active/Inactive) Bit 0 18 SDRAM6 (Active/Inactive) Byte 0:SDRAM Active/Inactive Register (1 = Enable, 0 = Disable), Default = Enabled Bit Pin # Description Byte 2: SDRAM Active/Inactive Register (1 = Active, 0 = Inactive), Default = Active Bit 7 11 SDRAM5 (Active/Inactive) Bit 6 10 SDRAM4 (Active/Inactive) Bit 5 -- Reserved, drive to 0 Bit 7 17 SDRAM13 (Active/Inactive) Bit 4 -- Reserved, drive to 0 Bit 6 12 SDRAM12 (Active/Inactive) Bit 3 7 SDRAM3 (Active/Inactive) Bit 5 -- Reserved, drive to 0 Bit 2 6 SDRAM2 (Active/Inactive) Bit 4 -- Reserved, drive to 0 Bit 1 3 SDRAM1 (Active/Inactive) Bit 3 -- Reserved, drive to 0 Bit 0 2 SDRAM0 (Active/Inactive) Bit 2 -- Reserved, drive to 0 Bit 1 -- Reserved, drive to 0 Bit 0 -- Reserved, drive to 0 Document #: 38-07143 Rev. *A Bit Pin # Description Page 2 of 8 CY2314ANZ Maximum Ratings Supply Voltage to Ground Potential ............... –0.5V to +7.0V Storage Temperature ................................. –65°C to +150°C DC Input Voltage (Except BUF_IN)........–0.5V to VDD + 0.5V Junction Temperature................................................. 150°C DC Input Voltage (BUF_IN)............................ –0.5V to +7.0V Static Discharge Voltage (per MIL-STD-883, Method 3015) ............................. >2000V Operating Conditions [1] Parameter Description Min. Max. Unit 3.135 3.465 V 0 70 °C Load Capacitance 30 pF CIN Input Capacitance 7 pF tPU Power-up time for all VDD's to reach minimum specified voltage (power ramps must be monotonic) 0.05 50 ms Min. Max. Unit 0.8 V VDD Supply Voltage TA Operating Temperature (Ambient Temperature) CL Electrical Characteristics Over the Operating Range Parameter Description Voltage[2] Test Conditions VIL Input LOW VILiic Input LOW Voltage VIH Input HIGH Voltage[2] IIL Input LOW Current (BUF_IN input) VIN = 0V IIL Input LOW Current (Except BUF_IN Pin) VIN = 0V IIH Input HIGH Current VIN = VDD VOL Output LOW Voltage[3] IOL = 25 mA VOH Voltage[3] Output HIGH Except serial interface pins For serial interface pins only 0.7 2.0 IOH = –36 mA –10 –10 V V 10 µA 100 µA 10 µA 0.4 V 2.4 V Supply Current[3] Unloaded outputs, 100 MHz IDD Supply Current[3] Loaded outputs, 100 MHz 290 mA IDD Supply Current[3] Unloaded outputs, 66.67 MHz 150 mA IDD Supply Current[3] Loaded outputs, 66.67 MHz 185 mA IDDS Supply Current BUF_IN=VDD or VSS All other inputs at VDD 500 µA IDD 200 mA Notes: 1. Electrical parameters are guaranteed under the operating conditions specified. 2. BUF_IN input has a threshold voltage of VDD/2. 3. Parameter is guaranteed by design and characterization. Not 100% tested in production. Document #: 38-07143 Rev. *A Page 3 of 8 CY2314ANZ Switching Characteristics[4] Over the Operating Range Parameter Name Test Conditions Min. Typ. Max. Unit 100 MHz Measured at 1.5V 45.0 50.0 55.0 % Rising Edge Rate[3] Measured between 0.4V and 2.4V 0.9 1.5 4.0 V/ns Falling Edge Rate[3] Measured between 2.4V and 0.4V 0.9 1.5 4.0 V/ns Maximum Operating Frequency Duty Cycle[3, 5] = t2 ÷ t1 t3 t4 Skew[3] t5 Output to Output +250 ps t6 SDRAM Buffer LH Prop. Delay[3] Input edge greater than 1 V/ns 1.0 3.5 5.0 ns t7 Delay[3] SDRAM Buffer HL Prop. t8 t9 All outputs equally loaded –250 Input edge greater than 1 V/ns 1.0 3.5 5.0 ns SDRAM Buffer Enable Delay[3] Input edge greater than 1 V/ns 1.0 5 12 ns SDRAM Buffer Disable Delay[3] Input edge greater than 1 V/ns 1.0 20 30 ns Notes: 4. All parameters specified with loaded outputs. 5. Duty cycle of input clock is 50%. Rising and falling edge rate of the input clock is greater than 1 V/ns. Switching Waveforms Duty Cycle Timing t1 t2 1.5V 1.5V 1.5V All Outputs Rise/Fall Time OUTPUT 2.4V 0.4V 2.4V 0.4V 3.3V 0V t4 t3 Output-Output Skew OUTPUT 1.5V 1.5V OUTPUT t5 Document #: 38-07143 Rev. *A Page 4 of 8 CY2314ANZ Switching Waveforms (continued) SDRAM Buffer LH and HL Propagation Delay INPUT OUTPUT t6 t7 SDRAM Buffer Enable and Disable Times OE Three-State Active OUTPUTS t8 t9 Test Circuit VDD 0.1 µF OUTPUTS CLK out CLOAD GND Document #: 38-07143 Rev. *A Page 5 of 8 CY2314ANZ Application Information Clock traces must be terminated with either series or parallel termination, as is normally done. Application Circuit Rs CPUCLK BUF_IN PCICLK USBCLK REF Rs SDATA SDATA SCLK SDRAM ( 0-13) SDRAM ( 0-13) SCLK V DD 3.3V APIC Ct V DD * CY2280 48 PIN SSOP (or CY2281 or CY2282) Cd 0.1uF V SS CY2314ANZ: 28-PIN SOIC CY2314 28 PIN SOIC * THIS FREQUENCY SYNTHESIZER IS USED TO GENERATE CPU, PCI, USB, REF, AND APIC CLOCKS. Cd = DECOUP LING CAPACITOR S Ct = OPTIONAL EMI-R EDUCING CAP ACI TORS Rs = SERIES TERMINATING RESISTORS Summary • Surface mount, low-ESR, ceramic capacitors should be used for filtering. Typically, these capacitors have a value of 0.1 µF. In some cases, smaller value capacitors may be required. • The value of the series terminating resistor satisfies the following equation, where Rtrace is the loaded characteristic impedance of the trace, Rout is the output impedance of the buffer (typically 25Ω), and Rseries is the series terminating resistor. Rseries > Rtrace – Rout • Footprints must be laid out for optional EMI-reducing capacitors, which should be placed as close to the terminating resistor as is physically possible. Typical values of these capacitors range from 4.7 pF to 22 pF. • A Ferrite Bead may be used to isolate the Board VDD from the clock generator VDD island. Ensure that the Ferrite Bead offers greater than 50Ω impedance at the clock frequency, under loaded DC conditions. Please refer to the application note “Layout and Termination Techniques for Cypress Clock Generators” for more details. • If a Ferrite Bead is used, a 10 µF–22 µF tantalum bypass capacitor should be placed close to the Ferrite Bead. This capacitor prevents power supply droop during current surges. Ordering Information Ordering Code CY2314ANZSC-1 Document #: 38-07143 Rev. *A Package Name S28 Package Type 28-Pin SOIC Operating Range Commercial Page 6 of 8 CY2314ANZ Package Diagram 28-Lead (300-Mil) Molded SOIC S21 51-85026-A Document #: 38-07143 Rev. *A Page 7 of 8 © Cypress Semiconductor Corporation, 2001. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. CY2314ANZ Document Title: CY2314ANZ 14 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs Document Number: 38-07143 REV. ECN NO. Issue Date Orig. of Change Description of Change ** 110252 11/18/01 DSG Change from Spec number: 38-00687 to 38-07143 *A 121830 12/14/02 RBI Power up requirements added to Operating Conditions Information Document #: 38-07143 Rev. *A Page 8 of 8