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The frequency of the REF and FB inputs are fNOM/2 or fNOM/4 when the part is configured for a frequency multiplication by using a divided output as the FB input. 3. When the FS pin is selected HIGH, the REF input must not transition upon power up until VCC has reached 4.3V. Document Number: 38-07138 Rev. *B Page 3 of 19 [+] Feedback CY7B991 CY7B992 Figure 1 shows the typical outputs with FB connected to a zero skew output.[4] Figure 1. Typical Outputs with FB Connected to a Zero-Skew Output t – 6t 0U t – 5t 0U t – 4t 0U t – 3t 0U t – 2t 0U t – 1t 0U t 0 t +1t 0U t +2t 0U t +3t 0U t +4t 0U t +5t 0U t +6t 0U FBInput REFInput 1Fx 3Fx 2Fx 4Fx (N/A) LM – 6t U LL LH – 4t U LM (N/A) – 3t U LH ML – 2t U ML (N/A) – 1t U MM MM 0tU MH (N/A) +1t U HL MH +2tU HM (N/A) +3t U HH HL +4tU (N/A) HM +6t U (N/A) LL/HH DIVIDED (N/A) HH INVERT Test Mode The TEST input is a three level input. In normal system operation, this pin is connected to ground, enabling the CY7B991 or CY7B992 to operate as explained in “Skew Select Matrix” on page 3. For testing purposes, any of the three level inputs can have a removable jumper to ground, or be tied LOW through a 100. resistor. This enables an external tester to change the state of these pins. If the TEST input is forced to its MID or HIGH state, the device operates with its internal phase locked loop disconnected, and input levels supplied to REF directly controls all outputs. Relative output to output functions are the same as in normal mode. In contrast with normal operation (TEST tied LOW), all outputs function based only on the connection of their own function selects inputs (xF0 and xF1) and the waveform characteristics of the REF input. Note 4. FB connected to an output selected for “zero” skew (i.e., xF1 = xF0 = MID). Document Number: 38-07138 Rev. *B Page 4 of 19 [+] Feedback CY7B991 CY7B992 Maximum Ratings Operating Range Operating outside these boundaries affects the performance and life of the device. These user guidelines are not tested. Storage Temperature .................................–65°C to +150°C Ambient Temperature with Power Applied ............................................–55°C to +125°C Supply Voltage to Ground Potential................–0.5V to +7.0V DC Input Voltage ............................................–0.5V to +7.0V Range Ambient Temperature VCC Commercial 0°C to +70°C 5V ± 10% Industrial –40°C to +85°C 5V ± 10% Military[5] –55°C to +125°C 5V ± 10% Military[5] –55°C to +125°C 5V ± 10% Output Current into Outputs (LOW).............................64 mA Static Discharge Voltage............................................>2001V (MIL-STD-883, Method 3015) Latch Up Current.....................................................>200 mA Note 5. Indicates case temperature. Document Number: 38-07138 Rev. *B Page 5 of 19 [+] Feedback CY7B991 CY7B992 Electrical Characteristics Over the Operating Range[6] Parameter Description Test Conditions CY7B991 CY7B992 UnitMin Max Min Max VOH Output HIGH Voltage VCC = Min IOH = –16 mA 2.4 V VCC = Min, IOH =–40 mA VCC–0.75 VOL Output LOW Voltage VCC = Min, IOL = 46 mA 0.45 V VCC = Min, IOL = 46 mA 0.45 VIH Input HIGH Voltage (REF and FB inputs only) 2.0 VCC VCC – 1.35 VCC V VIL Input LOW Voltage (REF and FB inputs only) –0.5 0.8 –0.5 1.35 V VIHH Three Level Input HIGH Voltage (Test, FS, xFn)[10] Min . VCC . Max VCC – 0.85 VCC VCC – 0.85 VCC V VIMM Three Level Input MID Voltage (Test, FS, xFn)[10] Min . VCC . Max VCC/2 – 500 mV VCC/2 + 500 mV VCC/2 – 500 mV VCC/2 + 500 mV V VILL Three Level Input LOW Voltage (Test, FS, xFn)[10] Min . VCC . Maximum 0.0 0.85 0.0 0.85 V IIH Input HIGH Leakage Current (REF and FB inputs only) VCC = Max, VIN = Max. 10 10 .A IIL Input LOW Leakage Current (REF and FB inputs only) VCC = Max, VIN = 0.4V –500 –500 .A IIHH Input HIGH Current (Test, FS, xFn) VIN = VCC 200 200 .A IIMM Input MID Current (Test, FS, xFn) VIN = VCC/2 –50 50 –50 50 .A IILL Input LOW Current (Test, FS, xFn) VIN = GND –200 –200 .A IOS Output Short Circuit Current[8] VCC = Max, VOUT = GND (25°C only) –250 N/A mA ICCQ Operating Current Used by Internal Circuitry VCCN = VCCQ = Max, All Input Selects Open Com’l 85 85 mA Mil/Ind 90 90 ICCN Output Buffer Current per Output Pair[9] VCCN = VCCQ = Max, IOUT = 0 mA Input Selects Open, fMAX 14 19 mA PD Power Dissipation per Output Pair[10] VCCN = VCCQ = Max, IOUT = 0 mA Input Selects Open, fMAX 78 104[11] mW Notes 6. For more information see “Group A Subgroup Testing” on page 17. 7. 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 datasheet limits are achieved. 8. CY7B991 must be tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room temperature only. CY7B992 outputs mustno...

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