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XRK4991IJ-5 Datasheet(PDF) 7 Page - Exar Corporation |
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XRK4991IJ-5 Datasheet(HTML) 7 Page - Exar Corporation |
7 / 12 page xr XRK4991 REV. 1.0.1 3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER 7 NOTES: 4. These inputs are normally wired to VCC, GND or left unconnected (actual threshold voltages vary as a percentage of VCC). Internal termination resistors hold unconnected inputs at VCC/2. If these inputs are switched, the function and timing of the outputs may glitch and the PLL may require an additional tLOCK time before all data sheet limits are achieved. 5. XRK4991 should be tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room temperature only. 6. Total output current per output pair can be approximated by the following expression that includes device current plus load current: XRK4991: ICCN = {(4+0.11F) + [(835-3F)/Z + (.0022FC)]N} x 1.1 Where: F = frequency in MHz C = capacitive load in pF Z = line impedance in ohms N = number of loaded outputs; 0, 1, or 2 7. Total power dissipation per output pair can be approximated by the following expression that includes device power dissipation plus power dissipation due to the load circuit: PD = {(22 + 0.61F) + [(1550 + 2.7F)/Z) + .0125FC]N} x 1.1 See note 6 for variable definition. 8. Applies to CLKIN and FB_IN inputs only. IOS Short Circuit Current [5] -200 mA VCC = Max, VOUT = GND (25° only) ICCQ Operating Current Used by Inter- nal Circuitry Com’l 95 mA VCCN = VCCQ = Max., All Inputs Selects Open Ind 100 ICCN Output Buffer Current per Output Pair [6] 19 mA VCCN = VCCQ = Max., IOUT = 0 mA Inputs Selects Open, fMAX PD Power Dissipation per Output Pair [7] 104 mW VCCN = VCCQ = Max., IOUT = 0 mA Input Selects Open, fMAX CAPACITANCE[8] SYMBOL DESCRIPTION MAX. UNIT CONDITION CIN Input Capacitance 10 pF TA = 25°C, f=1MHz, VCC=3.3V ELECTRICAL CHARACTERISTICS OVER THE 3.3V + 10% OPERATING RANGE SYMBOL DESCRIPTION MIN MAX UNIT CONDITION |
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