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| CY2304 3.3V Zero Delay Buffer Features * Zero input-output propagation delay, adjustable by capacitive load on FBK input * Multiple configurations - see "Available Configurations" table * Multiple low-skew outputs -- Output-output skew less than 200 ps -- Device-device skew less than 500 ps * 10-MHz to 133-MHz operating range * Low jitter, less than 200 ps cycle-cycle * Space-saving 8-pin 150-mil SOIC package * 3.3V operation * Industrial temperature available The part has an on-chip phase-locked loop (PLL) that locks to an input clock presented on the REF pin. The PLL feedback is required to be driven into the FBK pin, and can be obtained from one of the outputs. The input-to-output skew is guaranteed to be less than 250 ps, and output-to-output skew is guaranteed to be less than 200 ps. The CY2304 has two banks of two outputs each. The CY2304 PLL enters a power-down state when there are no rising edges on the REF input. In this mode, all outputs are three-stated and the PLL is turned off, resulting in less than 25 A of current draw. Multiple CY2304 devices can accept the same input clock and distribute it in a system. In this case, the skew between the outputs of two devices is guaranteed to be less than 500 ps. The CY2304 is available in two different configurations, as shown in the "Available Configurations" table. The CY2304-1 is the base part, where the output frequencies equal the reference if there is no counter in the feedback path. The CY2304-2 allows the user to obtain Ref and 1/2x or 2x frequencies on each output bank. The exact configuration and output frequencies depends on which output drives the feedback pin. Functional Description The CY2304 is a 3.3V zero delay buffer designed to distribute high-speed clocks in PC, workstation, datacom, telecom, and other high-performance applications. Logic Block Diagram FBK CLKA1 REF PLL CLKA2 /2 Pin Configuration 8-pin SOIC Top View REF CLKA1 CLKA2 GND 1 2 3 4 8 7 6 5 FBK VDD CLKB2 CLKB1 Extra Divider (-2) CLKB1 CLKB2 Available Configurations Device CY2304-1 CY2304-2 CY2304-2 FBK from Bank A or B Bank A Bank B Bank A Frequency Bank B Frequency Reference Reference 2 x Reference Reference Reference/2 Reference Cypress Semiconductor Corporation Document #: 38-07247 Rev. *C * 3901 North First Street * San Jose * CA 95134 * 408-943-2600 Revised December 7, 2002 CY2304 Pin Description Pin 1 2 3 4 5 6 7 8 REF[1] CLKA1[2] CLKA2[2] GND CLKB1[2] CLKB2 VDD FBK [2] Signal Clock output, Bank A Clock output, Bank A Ground Clock output, Bank B Clock output, Bank B 3.3V supply PLL feedback input Description Input reference frequency, 5V-tolerant input Zero Delay and Skew Control REF. Input to CLKA/CLKB Delay vs. Difference in Loading Between FBK Pin and CLKA/CLKB Pins To close the feedback loop of the CY2304, the FBK pin can be driven from any of the four available output pins. The output driving the FBK pin will be driving a total load of 7 pF plus any additional load that it drives. The relative loading of this output (with respect to the remaining outputs) can adjust the input-output delay. This is shown in the graph above. For applications requiring zero input-output delay, all outputs including the one providing feedback should be equally loaded. If input-output delay adjustments are required, use the above graph to calculate loading differences between the feedback output and remaining outputs. For zero output-output skew, be sure to load outputs equally. For further information on using CY2304, refer to the application note "CY2308: Zero Delay Buffer." Notes: 1. Weak pull-down. 2. Weak pull-down on all outputs. Document #: 38-07247 Rev. *C Page 2 of 8 CY2304 Maximum Ratings Supply Voltage to Ground Potential.................-0.5V to +7.0V DC Input Voltage (Except Ref) ...............-0.5V to VDD + 0.5V DC Input Voltage REF.............................................-0.5 to 7V Storage Temperature ..................................-65C to +150C Junction Temperature ..................................................150C Static Discharge Voltage (per MIL-STD-883, Method 3015) .............................> 2000V Operating Conditions for CY2304SC-X Commercial Temperature Devices Parameter VDD TA CL CIN tPU Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance (below 100 MHz) Load Capacitance (from 100 MHz to 133 MHz) Input Capacitance[3] Power-up time for all VDD's to reach minimum specified voltage (power ramps must be monotonic) 0.05 Description Min. 3.0 0 Max. 3.6 70 30 15 7 50 Unit V C pF pF pF ms Electrical Characteristics for CY2304SC-X Commercial Temperature Devices Parameter VIL VIH IIL IIH VOL VOH IDD (PD mode) IDD Description Input LOW Voltage Input HIGH Voltage Input LOW Current Input HIGH Current Output LOW Voltage[4] Output HIGH Voltage[4] Supply Current VIN = 0V VIN = VDD IOL = 8 mA (-1, -2) IOH = -8 mA (-1, -2) Unloaded outputs, 100-MHz REF, Select inputs at VDD or GND Unloaded outputs, 66-MHz REF (-1,-2) Unloaded outputs, 33-MHz REF (-1,-2) 2.4 12.0 45.0 32.0 18.0 2.0 50.0 100.0 0.4 Test Conditions Min. Max. 0.8 Unit V V A A V V A mA mA mA Power-down Supply Current REF = 0 MHz Switching Characteristics for CY2304SC-X Commercial Temperature Devices [5] Parameter t1 t1 Name Output Frequency Output Frequency Duty Cycle[4] = t2 / t1 (-1,-2) Duty Cycle[4] = t2 / t1 (-1,-2) t3 t3 Rise Time[4] (-1, -2) Rise Time[4] (-1, -2) Test Conditions 30-pF load, all devices 15-pF load, -1, -2 devices Measured at 1.4V, FOUT = 66.66 MHz 30-pF load Measured at 1.4V, FOUT < 50.0 MHz 15-pF load Measured between 0.8V and 2.0V, 30-pF load Measured between 0.8V and 2.0V, 15-pF load Min. 10 10 40.0 45.0 50.0 50.0 Typ. Max. 100 133.3 60.0 55.0 2.20 1.50 Unit MHz MHz % % ns ns Notes: 3. Applies to both REF clock and FBK. 4. Parameter is guaranteed by design and characterization. Not 100% tested in production. 5. All parameters are specified with loaded output. Document #: 38-07247 Rev. *C Page 3 of 8 CY2304 Switching Characteristics for CY2304SC-X Commercial Temperature Devices (continued)[5] Parameter t4 t4 t5 Name Fall Time (-1, -2) [4] Test Conditions Measured between 0.8V and 2.0V, 30-pF load Measured between 0.8V and 2.0V, 15-pF load Min. Typ. Max. 2.20 1.50 200 200 400 Unit ns ns ps ps ps ps ps ps ps ps ps ps ms Fall Time[4] (-1, -2) Output-to-Output Skew All outputs equally loaded on same Bank (-1,-2)[4] Output Bank A to Output All outputs equally loaded Bank B Skew (-1) Output Bank A to Output All outputs equally loaded Bank B Skew (-2) t6 t7 tJ Skew, REF Rising Edge Measured at VDD/2 to FBK Rising Edge[4] Device-to-Device Skew[4] Cycle-to-Cycle Jitter[4] (-1) Cycle-to-Cycle Jitter[4] (-2) PLL Lock Time[4] Measured at VDD/2 on the FBK pins of devices Measured at 66.67 MHz, loaded outputs, 15-pF load Measured at 66.67 MHz, loaded outputs, 30-pF load Measured at 133.3 MHz, loaded outputs, 15 pF load Measured at 66.67 MHz, loaded outputs 30-pF load Measured at 66.67 MHz, loaded outputs 15-pF load Stable power supply, valid clocks presented on REF and FBK pins 0 0 250 500 175 200 100 400 375 1.0 tJ tLOCK Operating Conditions for CY2304SI-X Industrial Temperature Devices Parameter VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance (below 100 MHz) Load Capacitance (from 100 MHz to 133 MHz) Input Capacitance Description Min. 3.0 -40 Max. 3.6 85 30 15 7 Unit V C pF pF pF Switching Characteristics for CY2304SI-X Industrial Temperature Devices Parameter t1 t1 Name Output Frequency Output Frequency Duty Cycle[4] = t2 / t1 (-1,-2) Duty Cycle[4] = t2 / t1 (-1,-2) t3 t3 t4 t4 Rise Time[4] (-1, -2) Rise Time[4] (-1, -2) Fall Time[4] (-1, -2) Fall Time[4] (-1, -2) Test Conditions 30-pF load, All devices 15-pF load, All devices Measured at 1.4V, FOUT = 66.66 MHz 30-pF load Measured at 1.4V, FOUT < 50.0 MHz 15-pF load Measured between 0.8V and 2.0V, 30-pF load Measured between 0.8V and 2.0V, 15-pF load Measured between 0.8V and 2.0V, 30-pF load Measured between 0.8V and 2.0V, 15-pF load Min. 10 10 40.0 45.0 [5] Typ. Max. 100 133.3 Unit MHz MHz % % ns ns ns ns 50.0 50.0 60.0 55.0 2.50 1.50 2.50 1.50 Document #: 38-07247 Rev. *C Page 4 of 8 CY2304 Switching Characteristics for CY2304SI-X Industrial Temperature Devices (continued)[5] Parameter t5 Name Output-to-Output Skew on same Bank (-1,-2)[4] Test Conditions All outputs equally loaded Min. Typ. Max. 200 200 400 0 0 250 500 180 200 100 400 380 1.0 Unit ps ps ps ps ps ps ps ps ps ps ms Output Bank A to Output Bank All outputs equally loaded B Skew (-1) Output Bank A to Output Bank All outputs equally loaded B Skew (-2) t6 t7 tJ Skew, REF Rising Edge to FBK Rising Edge[4] Device-to-Device Skew[4] Cycle-to-Cycle Jitter[4] (-1) Measured at VDD/2 Measured at VDD/2 on the FBK pins of devices Measured at 66.67 MHz, loaded outputs, 15-pF load Measured at 66.67 MHz, loaded outputs, 30-pF load Measured at 133.3 MHz, loaded outputs, 15 pF load tJ Cycle-to-Cycle Jitter[4] (-2) Measured at 66.67 MHz, loaded outputs, 30-pF load Measured at 66.67 MHz, loaded outputs, 15-pF load tLOCK PLL Lock Time[4] Stable power supply, valid clocks presented on REF and FBK pins Electrical Characteristics for CY2304SI-X Industrial Temperature Devices Parameter VIL VIH IIL IIH VOL VOH IDD (PD mode) IDD Description Input LOW Voltage Input HIGH Voltage Input LOW Current Input HIGH Current Output LOW Voltage[4] Output HIGH Voltage[4] Power-down Supply Current Supply Current VIN = 0V VIN = VDD IOL = 8 mA (-1, -2) IOH = -8 mA (-1, -2) REF = 0 MHz Unloaded outputs, 100 MHz, Select inputs at VDD or GND Unloaded outputs, 66-MHz REF (-1, -2) Unloaded outputs, 33-MHz REF (-1, -2) 2.4 25.0 45.0 35.0 20.0 2.0 50.0 100.0 0.4 Test Conditions Min. Max. 0.8 Unit V V A A V V A mA mA mA Switching Waveforms Duty Cycle Timing t2 1.4V 1.4V 1.4V t1 Document #: 38-07247 Rev. *C Page 5 of 8 CY2304 Switching Waveforms All Outputs Rise/Fall Time OUTPUT 2.0V 0.8V t3 2.0V 0.8V t4 3.3V 0V Output-Output Skew OUTPUT 1.4V OUTPUT t5 1.4V Input-Output Skew INPUT VDD/2 FBK t6 VDD/2 Device-Device Skew FBK, Device 1 VDD/2 FBK, Device 2 t7 VDD/2 Test Circuits Test Circuit # 1 VDD 0.1 F OUTPUTS V DD 0.1 F GND GND CLK OUT C LOAD Test circuit for all parameters except t8 Document #: 38-07247 Rev. *C Page 6 of 8 CY2304 Ordering Information Ordering Code CY2304SC-1 CY2304SI-1 CY2304SC-2 CY2304SI-2 Package Name S8 S8 S8 S8 Package Type 8-pin 150-mil SOIC 8-pin 150-mil SOIC 8-pin 150-mil SOIC 8-pin 150-mil SOIC Operating Range Commercial Industrial Commercial Industrial Package Diagram 8-lead (150-Mil) SOIC S8 51-85066-A Document #: 38-07247 Rev. *C Page 7 of 8 (c) Cypress Semiconductor Corporation, 2002. 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. CY2304 Document Title: CY2304 3.3V Zero Delay Buffer Document Number: 38-07247 REV. ** *A *B *C ECN N0. 110512 112294 113934 121851 Issue Date 12/11/01 03/04/02 05/01/02 12/14/02 Orig. of Change SZV CKN CKN RBI Description of Change Change from Spec number: 38-01010 to 38-07247 On Pin Configuration Diagram (p.1), swapped CLKA2 and CLKA1 Added Operating Conditions for CY2304SI-X Industrial Temperature Devices, p. 4 Power up requirements added to Operating Conditions Information Document #: 38-07247 Rev. *C Page 8 of 8 |
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