PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCKpairs programmable skew outpu

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PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCKpairs programmable skew outpu

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QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCKpairs programmable skew outputs skew: 200ps same pair, 250ps outputs Selectable positive negative edge synchronization: Excellent applications Synchronous output enable Output frequency: 6.25MHz 100MHz 1/2, outputs with outputs skew grades: QS5991 tSKEW0 <250ps QS5991 tSKEW0 <500ps QS5991 tSKEW0 <750ps 3-level inputs skew range control bypass testing External feedback, internal loop filter 46mA high drive outputs Jitter: <200ps peak-to-peak Outputs drive terminated lines compatible with Cypress CY7B991 Available PLCC Package
QS5991
DESCRIPTION:
QS5991 high fanout based clock driver intended high performance computing data-communications applications. feature programmable skew ability outputs lead input signal. QS5991 eight programmable skew outputs four banks Skew controlled 3-level input signals that hard-wired appropriate HIGH-MID-LOW levels. QS5991 maintains Cypress CY7B991 compatibility while providing additional features: Synchronous Output Enable (GND/sOE), Positive/Negative Edge Synchronization (VCCQ/PE). When GND/ held low, outputs synchronously enabled (CY7B991 compatibility). However, GND/sOE held high, outputs except synchronously disabled. Furthermore, when VCCQ/PE held high, outputs synchronized with positive edge clock input (CY7B991 compatibility). When VCCQ/PE held low, outputs synchronized with negative edge REF.
FUNCTIONAL BLOCK DIAGRAM
ND/sOE
Skew Select 1F1:0 Skew Select Skew Select 3F1:0 2F1:0
Skew Select 4F1:0
COMMERCIAL/INDUSTRIAL TEMPERATURE RANGES
2000 Integrated Device Technology, Inc.
MARCH 2000
DSC-5809/-
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
CONFIGURATION
VCCQ
ABSOLUTE MAXIMUM RATINGS
Symbol Rating Supply Voltage Ground Input Voltage Maximum Power Dissipation 85°C) TSTG Storage Temperature Range Max. -0.5 -0.5
Unit
ND/sO
-65°C +150°C
J32-1
NOTE: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS cause permanent damage device. This stress rating only functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect reliability.
CAPACITANCE 1MHz,
Parameter Description Input Capacitance Typ. Max. Unit
NOTE: Capacitance applies inputs except TEST, nF1:0.
PLCC VIEW
DESCRIPTION
Name TEST GND/ Type Reference Clock Input Feedback Input When HIGH, disables (except conditions Note goes outputs. Skew selections (see Control Summary Table) remain effect. normal operation. Synchronous Output Enable. When HIGH, stops clock outputs (Except 3Q1) state used feedback signal maintain phase lock. When TEST held level GND/sOE HIGH, nF[1:0] pins output disable controls individual banks when nF[1:0] GND/sOE normal operation. Selectable positive negative edge control. When LOW/HIGH outputs synchronized with negative/positive edge reference clock. 3-level inputs selecting skew taps frequency functions. Selects appropriate oscillator circuit based anticipated frequency range. (See Programmable Skew Range.) Four banks outputs with programmable skew. Power supply output buffers Power supply phase locked loop other internal circuitry Ground Description
VCCQ/PE nF[1:0] nQ[1:0] VCCN VCCQ
NOTE: When TEST GND/sOE HIGH, remains active with nF[1:0] functioning output disable control individual output banks. Skew selections remain effect unless nF[1:0]
PROGRAMMABLE SKEW
Output skew with respect input adjustable compensate trace delays, backplane propagation delays accommodate requirements special timing relationships between clocked components. Skew selectable multiple time unit which order nanosecond (see Programmable Skew Range Resolution Table). There nine skew configurations available each output pair. These configurations chosen nF1:0 control pins. order minimize number control pins, 3-level inputs (HIGH-MID-LOW) used, they intended restricted hard-wiring. Undriven 3-level inputs default level. Where programmable skew requirement, control pins left open zero skew default setting. Control Summary Table shows select specific skew taps using nF1:0 control pins.
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
EXTERNAL FEEDBACK
providing external feedback, QS5991 gives users flexibility with regard skew adjustment. signal compared with input signal phase detector order drive VCO. Phase differences cause adjust upwards downwards accordingly. internal loop filter moderates response phase detector. loop filter transfer function been chosen provide minimal jitter frequency variation) while still providing accurate responses input frequency changes.
PROGRAMMABLE SKEW RANGE RESOLUTION TABLE
Timing Unit Calculation (tU) Frequency Range (FNOM) (1,2) Skew Adjustment Range Adjustment: ±9.09ns ±14% Example FNOM 25MHz Example FNOM 30MHz Example FNOM 40MHz Example FNOM 50MHz Example FNOM 80MHz 0.91ns 0.76ns ±9.23ns ±23% 0.96ns 0.77ns ±9.38ns ±37% 0.78ns Phase Degrees Cycle Time 1/(44 FNOM) 35MHz 1/(26 FNOM) 60MHz HIGH 1/(16 FNOM) Comments
NOTES: device operated outside recommended frequency ranges without damage, functional operation guaranteed. Selecting appropriate value based input frequency range allows operate `sweet spot' where jitter lowest. level determined nominal operating frequency Time Unit Generator. frequency always appears 1Q1:0, 2Q1:0, higher outputs when they operated their undivided modes. frequency appearing inputs will same when output connected undivided. frequency inputs will frequency when part configured frequency multiplication using divided output input. Skew adjustment range assumes that zero skew output used feedback. skewed output used feedback, then adjustment range will greater. example skewed output used feedback, other outputs will skewed -4tU addition whatever skew value programmed those outputs. `Max adjustment' range applies output pairs where skew adjustment possible lowest FNOM value. maximum Clock Input Frequency 85MHz. feedback Control Summary Table explicitly output frequency 100MHz.
CONTROL SUMMARY TABLE FEEDBACK SIGNALS
nF1:0 LL(1) Skew (Pair -4tU -3tU -2tU -1tU Zero Skew Skew (Pair Divide -6tU -4tU -2tU Zero Skew Divide Skew (Pair Divide -6tU -4tU -2tU Zero Skew Inverted(2)
NOTES: disables outputs TEST GND/sOE HIGH. When pair (inverted), GND/sOE disables pair HIGH when VCCQ/PE= HIGH, GND/sOE disables pair when VCCQ/PE= LOW.
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
RECOMMENDED OPERATING RANGE
QS5991-5, (Industrial) Symbol Description Power Supply Voltage Ambient Operating Temperature Min. Max. Min. 4.75 QS5991-2 (Commercial) Max. 5.25 Unit
ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol VIHH VIMM VILL Parameter Input HIGH Voltage Input Voltage Input HIGH Voltage Input Voltage
Conditions Guaranteed Logic HIGH (REF, Inputs Only) Guaranteed Logic (REF, Inputs Only) 3-Level Inputs Only 3-Level Inputs Only 3-Level Inputs Only Max. VCC/2 Max., Max., Min., -16mA Min., -40mA Min., 46mA
Min. VCC-1 VCC/2-0.5
Max. VCC/2+0.5 ±200 ±200 ±100 ±100 0.45
Unit
Input Voltage Input Leakage Current (REF, Inputs Only) 3-Level Input Current (TEST, nF1:0) Input Pull-Up Current (VCCQ/PE) Input Pull-Down Current (GND/sOE) Output HIGH Voltage Output Voltage Output Short Circuit Current
HIGH Level Level Level
Max.,
NOTES: These inputs normally wired VCC, GND, unconnected. Internal termination resistors bias unconnected inputs VCC/2. these inputs switched, function timing outputs glitched, require additional tLOCK time before datasheet limits achieved. This measured 25°C with 10:1 duty cycle, output time, second maximum.
POWER SUPPLY CHARACTERISTICS
Symbol ICCQ ICCD ITOT Parameter Quiescent Power Supply Current Power Supply Current Input HIGH Dynamic Power Supply Current Output Total Power Supply Current Test Conditions Max., TEST MID, LOW, GND/sOE LOW, outputs unloaded Max., 3.4V Max., FREF 20MHz, 240pF FREF 33MHz, 240pF FREF 66MHz, 240pF
NOTE: eight outputs, each loaded with 30pF.
Typ.
Max.
Unit µA/MHz
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
INPUT TIMING REQUIREMENTS
Symbol tPWC Description Maximum input rise fall times, 0.8V Input clock pulse, HIGH Input duty cycle Reference Clock Input Min. Max. Unit ns/V
NOTE: Where pulse width implied less than tPWC limit, tPWC limit applies.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
QS5991-2 Symbol FNOM tRPWH tRPWL tSKEWPR tSKEW0 tSKEW1 tSKEW2 tSKEW3 tSKEW4 tDEV tODCV tPWH tPWL tORISE tOFALL tLOCK Parameter Frequency Range Pulse Width HIGH Pulse Width Programmable Skew Time Unit Zero Output Matched-Pair Skew (xQ0, xQ1) (1,2, -0.25 -1.2 0.15 0.15 Peak-to-Peak
(1,9) (1,10)
QS5991-5
QS5991-7 Unit
Min.
Typ. 0.05 0.25 0.25
Max. Min. Typ. Max. Min. Typ. Max. Programmable Skew Range Resolution Table 0.25 01.2 0.75 0.25 -0.5 -1.2 0.15 0.15 0.25 0.25 1.25 -0.7 -1.2 0.15 0.15 0.25 0.75 1.65
Skew Selection Table Output Pairs
Zero Output Skew (All Outputs) 0pF(1, Output Skew (Rise-Rise, Fall-Fall, Same Class Outputs)(1, Output Skew (Rise-Fall, Nominal-Inverted, Divided-Divided)(1, Output Skew (Rise-Rise, Fall-Fall, Different Class Outputs)(1, Output Skew (Rise-Fall, Nominal-Divided, Divided-Inverted)(1, Device-to-Device Skew( 1,2, Input Propagation Delay( 1,8) Output Duty Cycle Variation from Output HIGH Time Deviation from Output Time Deviation from Output Rise Time(1) Output Fall Time(1) Lock Time(7) Cycle-to-Cycle Output Jitter
NOTES: timing tolerances apply FNOM 25MHz. Skew time between earliest latest output transition among outputs which same delay been selected when loaded with specified load. tSKEWPR skew between pair outputs (xQ0 xQ1) when eight outputs selected 0tU. tSKEW0 skew between outputs when they selected 0tU. There classes outputs: Nominal (multiple delay), Inverted (4Q0 only with HIGH), Divided (3Qx only Divide-by-2 Divide-by-4 mode). tDEV output-to-output skew between devices operating under same conditions ambient temperature, flow, etc.) tLOCK time that required before synchronization achieved. This specification valid only after stable within normal operating limits. This parameter measured from application signal frequency until within specified limits. measured with input rise fall times (from 0.8V 1ns. Measured Measured 0.8V. Refer Input Timing Requirements table more detail.
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
TEST LOADS WAVEFORMS
Output
50pF 30pF devices)
TEST LOAD
ORISE
OFALL
2.0V
0.8V
OUTPUT WAVEFORM
3.0V 2.0V 1.5V 0.8V
INPUT TEST WAVEFORM
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
TIMING DIAGRAM
SKEW SKEW
SKEW
SKEW
SKEW SKEW
IVIDED
SKEW
SKEW 1,3,4
SKEW
IVIDED
NOTES: VCCQ/PE: Timing Diagram applies VCCQ/PE=VCC. VCCQ/PE=GND, negative edge aligns with negative edge REF, divided outputs change negative edge REF, positive edges divide-by-2 divide-by-4 signals align. Skew: time between earliest latest output transition among outputs which same delay been selected when loaded with 50pF (30pF terminated with 2.06V. skew between outputs when they selected 0tU. output-to-output skew between devices operating under same conditions (VCC, ambient temperature, flow, etc.) deviation output from duty cycle. Output pulse width variations included SKEW2 tSKEW4 specifications.
tSKEWPR: skew between pair outputs (xQ0 xQ1) when eight outputs selected 0tU. tSKEW0: tDEV: tODCV:
tPWH measured 2.0V. tPWL measured 0.8V. tORISE tOFALL measured between 0.8V 2.0V. tLOCK: time that required before synchronization achieved. This specification valid only after stable within normal operating limits. This parameter measured from application signal frequency until within specified limits.
QS5991 PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCK
ORDERING INFORMATION
XXXXX Device Type Package Process
Commercial (0°C +70°C) Industrial (-40°C +85°C)
Rectangular Plastic Leaded Chip Carrier (J32-1)
5991-2 5991-5 5991-7
Programmable Skew Clock Driver TurboClock
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PROGRAMMABLE SKEW CLOCK DRIVER TURBOCLOCKpairs programmable skew outpu

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