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PI6C3991-2J Datasheet(PDF) 3 Page - Pericom Semiconductor Corporation |
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PI6C3991-2J Datasheet(HTML) 3 Page - Pericom Semiconductor Corporation |
3 / 11 page 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PI6C3991 3.3V High-Speed, Low-Voltage Programmable Skew Clock Buffer - SuperClock® 3 PS8450B 04/09/01 FB Input REF Input (N/A) HH Invert (N/A) LL/HH Divided (N/A) LM –6tU LL LH –4tU LM (N/A) –3tU LH ML –2tU ML (N/A) –1tU MM MM 0tU MH (N/A) +1tU HL MH +2tU HM (N/A) +3tU HH HL +4tU (N/A) HM +6tU 1Fx 2Fx 3Fx 4Fx Figure1.TypicalOutputswithFBConnectedtoa Zero-SkewOutput(3) Note: 3. FB connected to an output selected for "zero" skew (ie.,xF1=xF0=MID). Block Diagram Description Phase Frequency Detector and Filter These two blocks accept input signals from the reference frequency (REF) input and the feedback (FB) input and generate correction information to control the frequency of the Voltage-Controlled Oscillator (VCO). These blocks, along with the VCO, form a Phase- Locked Loop (PLL) that tracks the incoming REF signal. VCO and Time Unit Generator The VCO accepts analog control inputs from the PLL filter block and generates a frequency that is used by the time unit generator to create discrete time units that are selected in the skew mix matrix. The operational range of the VCO is determined by the FS control pin. The time unit (tU) is determined by the operating frequency of the device and the level of the FS pin as shown in Table 1. Skew Select Matrix The skew select matrix is comprised of four independent sections. Each section has two low-skew, high-fanout drivers (xQ0, xQ1), and two corresponding three-level function select (xF0, xF1) inputs. Table 2 shows the nine possible output functions for each section as determined by the function select inputs. All times are measured with respect to the REF input assuming that the output connected to the FB input has 0tU selected. e g n a Re r u t a r e p m e T t n e i b m AV C C l ai c r e m m o CC ° 0 7 + o t C ° 0% 0 1 ± V 3 . 3 l ai rt s u d n IC ° 5 8 + o t C ° 0 4 % 0 1 ± V 3 . 3 Test Mode The TEST input is a three-level input. In normal system operation, this pin is connected to ground, allowing the PI6C3991 to operate as explained briefly above (for testing purposes, any of the three level inputs can have a removablejumper to ground, or be tied LOW through a 100 Ohm resistor. This will allow an external tester to change the state of these pins.) If the TEST input is forced to its MID or HIGH state, the device will operate with its internal phase locked loop disconnected, and input levels supplied to REF will directly control all outputs. Relative output to output functions are the same as in normal mode. In contrast with normal operation (TEST tied LOW). All outputs will function based only on the connection of their own function select inputs (xF0 and xF1) and the waveform characteristics of the REF input. Storage Temperature ...................................... 65°Cto+150°C Ambient Temperature with Power Applied .................................................55°Cto+125°C Supply Voltage to Ground Potential .................. 0.5Vto+7.0V DC Input Voltage ...............................................0.5Vto+7.0V Output Current into Outputs (LOW) ............................... 64mA Static Discharge Voltage ............................................... >2001V (perMIL-STD-883,Method3015) Latch-UpCurrent ......................................................... >200mA MaximumRatings OperatingRange |
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