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5T9955BFI8

型号：

5T9955BFI8

品牌：

IDT[ INTEGRATED DEVICE TECHNOLOGY ]

页数：

11 页

PDF大小：

137 K

下载PDF手册
2.5V PROGRAMMABLE  
SKEW DUAL PLL CLOCK  
DRIVER TURBOCLOCK™ W  
IDT5T9955  
FEATURES:  
DESCRIPTION:  
• Ref input is 3.3V tolerant  
The IDT5T9955 is a high fanout 2.5V PLL based clock driver intended  
forhighperformancecomputinganddata-communicationsapplications.A  
keyfeatureoftheprogrammableskewistheabilityofoutputstoleadorlag  
the REF input signal. The IDT5T9955 has sixteen programmable skew  
outputs in eight banks of 2. The two separate PLLs allow the user to  
independently control A and B banks. Skew is controlled by 3-level input  
signals that may be hard-wired to appropriate high-mid-low levels.  
The feedback input allows divide-by-functionality from 1 to 12 through  
the use of the xDS[1:0] inputs. This provides the user with frequency  
multiplication from 1 to 12 without using divided outputs for feedback.  
WhenthexsOEpinisheldlow, allthexbankoutputsaresynchronously  
enabled. However, ifxsOEisheldhigh, allthexbankoutputsexceptx2Q0  
and x2Q1 are synchronously disabled. The xLOCK output is high when  
the xbank PLL has achieved phase lock.  
• 8 pairs of programmable skew outputs  
• Low skew: 185ps same pair, 250ps same bank, 350ps both  
banks  
• Selectable positive or negative edge synchronization on each  
bank: excellent for DSP applications  
• Synchronous output enable on each bank  
• Input frequency: 2MHz to 160MHz  
• Output frequency: 6MHz to 160MHz  
• 3-level inputs for skew and PLL range control  
• 3-level inputs for feedback divide selection multiply / divide  
ratios of (1-6, 8, 10, 12) / (2, 4)  
• PLL bypass for DC testing  
• External feedback, internal loop filter  
• 12mA balanced drive outputs  
• Low Jitter: <100ps cycle-to-cycle  
• Power-down mode on each bank  
• Lock indicator on each bank  
Furthermore, when xPE is held high, all the outputs are synchronized  
withthepositiveedgeoftheREFclockinput. WhenxPEisheldlow, allthe  
outputsaresynchronizedwiththenegativeedgeofREF. TheIDT5T9955  
has LVTTL outputs with 12mA balanced drive outputs.  
• Available in BGA package  
FUNCTIONALBLOCKDIAGRAM  
ALOCK  
APE  
BPE  
AFS  
BFS  
BLOCK  
REF  
TEST  
BPD  
APD  
AsOE  
BsOE  
3
3
3
3
PLL  
PLL  
/ N  
/ N  
BFB  
AFB  
3
3
3
3
BDS1:0  
B1F1:0  
ADS1:0  
A1F1:0  
3
3
B1Q0  
B1Q1  
A1Q0  
A1Q1  
3
3
Skew  
Select  
Skew  
Select  
3
3
B2Q0  
B2Q1  
3
3
A2Q0  
A2Q1  
Skew  
Skew  
Select  
B2F1:0  
B3F1:0  
B4F1:0  
A2F1:0  
A3F1:0  
A4F1:0  
Select  
3
3
B3Q0  
B3Q1  
3
3
A3Q0  
A3Q1  
Skew  
Select  
Skew  
Select  
3
3
B4Q0  
B4Q1  
A4Q0  
A4Q1  
3
3
Skew  
Select  
Skew  
Select  
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.  
INDUSTRIAL TEMPERATURE RANGE  
DECEMBER 2006  
1
c
2006 Integrated Device Technology, Inc.  
DSC 5976/13  
IDT5T9955  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
INDUSTRIALTEMPERATURERANGE  
PINCONFIGURATION  
6
B1F1  
BDS1  
BVDDQ  
A3Q1  
A4Q0  
A4Q1  
APE  
APD  
A4F1  
A3F1  
AFS  
B2F1  
BLOCK  
B1Q0  
B1Q1  
B2Q0  
B2Q1  
BFB  
5
4
A3Q0  
AGND AGND  
AGND AGND  
AGND  
AVDDQ  
AVDDQ  
AVDDQ  
ASOE  
A4F0  
A3F0  
AVDD  
BGND  
TEST  
BVDDQ  
BVDD  
B2F0  
B1F0  
BDS0  
BVDDQ BGND BGND  
BVDDQ BGND BGND  
AGND  
AVDDQ  
AVDDQ  
AVDDQ  
AVDDQ  
BVDDQ  
BVDDQ  
BVDDQ  
3
2
AVDDQ  
A1F0  
BVDDQ  
B3F0  
BVDDQ  
B4F0  
BVDDQ  
BSOE  
BVDDQ  
AFB  
AGND AGND  
AGND AGND  
AVDDQ  
ADS0  
AVDDQ  
A2F0  
REF  
BGND BGND BGND  
A2Q1  
AGND  
BGND BGND BGND  
B3Q0  
1
A2Q0  
A
A1Q1  
B
A1Q0  
C
AVDDQ  
D
ALOCK  
ADS1  
F
A1F1  
G
A2F1  
H
BFS  
J
B3F1  
K
B4F1  
L
BPD  
M
BPE  
N
B4Q1  
P
B4Q0  
R
B3Q1  
T
E
FPBGA  
TOP VIEW  
96 BALL FPBGA PACKAGE ATTRIBUTES  
1.5mm Max.  
1.4mm Nom.  
1.3mm Min.  
0.8mm  
6
5
4
TOP VIEW  
3
2
1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
J
J
K
K
L
L
M
M
N
N
P
R
R
T
T
P
1
2
3
4
5
6
5.5mm  
13.5mm  
2
IDT5T9955  
INDUSTRIALTEMPERATURERANGE  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
ABSOLUTEMAXIMUMRATINGS(1)  
CAPACITANCE(TA = +25°C, f = 1MHz, VIN = 0V)  
Symbol  
Description  
Max  
–0.5 to +4.6  
–0.5 to VDD+0.5  
–0.5 to +4.6  
1.1  
Unit  
V
Parameter Description  
InputCapacitance  
Typ.  
Max.  
10  
Unit  
VDDQ, VDD Supply Voltage to Ground  
CIN  
REF  
8
5
pF  
VI  
DC Input Voltage  
REF Input Voltage  
Maximum Power  
Dissipation  
V
Others  
7
V
NOTE:  
1. Capacitance applies to all inputs except TEST, xFS, xnF[1:0], and xDS[1:0].  
TA = 85°C  
TA = 55°C  
W
1.9  
TSTG  
Storage Temperature Range  
–65 to +150  
°C  
NOTE:  
1. Stresses beyond those listed under ABSOLUTE MAXIMUM RATINGS may cause  
permanent damage to the device. These are stress ratings only, and functional  
operation of the device at these or any other conditions above those indicated in the  
operational sections of this specification is not implied. Exposure to absolute-  
maximum-rated conditions for extended periods may affect device reliability.  
PINDESCRIPTION  
Pin Name  
REF  
Type  
IN  
Description  
ReferenceClockInput  
xFB  
IN  
Individual Feedback Inputs for A and B banks  
TEST(1)  
IN  
WhenMIDorHIGH, disablesPLL forAandBbanks(exceptforconditionsofNote1). REFgoestoalloutputs. SkewSelections(See  
ControlSummaryTable)remainineffect. SetLOWfornormaloperation.  
xsOE(1)  
IN  
IndividualSynchronousOutputEnable forAandBbanks. WhenHIGH, itstopsclockoutputs(exceptx2Q0 andx2Q1)inaLOWstate  
(forxPE=H)-x2Q0 andx2Q1maybeusedasthefeedbacksignaltomaintainphaselock. WhenTESTisheldatMIDlevelandxsOE  
is HIGH, the nF[1:0] pins act as output disable controls for individual banks when xnF[1:0] = LL. Set xsOE LOW for normal operation  
(hasinternalpull-down).  
xPE  
IN  
IndividualSelectablepositiveornegativeedgecontrolforAandBbanks. WhenLOW/HIGHtheoutputsaresynchronizedwiththenegative/  
positiveedgeofthereferenceclock(hasinternalpull-up).  
xnF[1:0]  
xFS  
IN  
IN  
3-levelinputsforselecting1of9skewtapsorfrequencyfunctions  
Selectsappropriateoscillatorcircuitbasedonanticipatedfrequencyrange. (SeeProgrammableSkewRange.) IndividualcontrolonA  
and B banks.  
xnQ[1:0]  
xDS[1:0]  
xPD  
OUT  
IN  
Eightbanksoftwooutputswithprogrammableskew  
3-levelinputsforfeedbackdividerselectionforAandBbanks  
IN  
Power down control. Shuts off either A or B bank of the chip when LOW (has internal pull-up).  
xLOCK  
OUT  
PLL lock indication signal for A and B banks. HIGH indicates lock. LOW indicates that the PLL is not locked and outputs may not be  
synchronizedtotheinputs. (FormoreinformationonapplicationspecificuseoftheLOCKpin,pleaseseeAN237.)  
VDDQ  
VDD  
PWR  
PWR  
PWR  
Powersupplyforoutputbuffers  
Powersupplyforphaselockedloop,lockoutput,andotherinternalcircuitry  
Ground  
GND  
NOTE:  
1. When TEST = MID and xsOE = HIGH, PLL remains active with xnF[1:0] = LL functioning as an output disable control for individual output banks. Skew selections remain  
in effect unless xnF[1:0] = LL.  
3
IDT5T9955  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
INDUSTRIALTEMPERATURERANGE  
PROGRAMMABLESKEW  
Output skew with respect to the REF input is adjustable to compensate order to minimize the number of control pins, 3-level inputs (HIGH-MID-  
for PCB trace delays, backplane propagation delays or to accommodate LOW) are used, they are intended for but not restricted to hard-wiring.  
requirements for special timing relationships between clocked compo- Undriven 3-level inputs default to the MID level. Where programmable  
nents. Skew is selectable as a multiple of a time unit (tU) which ranges skew is not a requirement, the control pins can be left open for the zero  
from 782ps to 1.5625ns (see Programmable Skew Range and Resolu- skew default setting. The Control Summary Table shows how to select  
tion Table). There are nine skew configurations available for each out- specific skew taps by using the xnF1:0 control pins.  
put pair. These configurations are chosen by the xnF1:0 control pins. In  
EXTERNALFEEDBACK  
By providing two separate external feedbacks, the IDT5T9955 gives  
An internal loop filter moderates the response of the VCO to the  
users flexibility with regard to skew adjustment. The xFB signal is com- phase detector. The loop filter transfer function has been chosen to  
pared with the input REF signal at the phase detector in order to drive provide minimal jitter (or frequency variation) while still providing accu-  
the VCO. Phase differences cause the VCO of the PLL to adjust up- rate responses to input frequency changes.  
wards or downwards accordingly.  
PROGRAMMABLESKEWRANGEANDRESOLUTIONTABLE  
xFS = LOW  
1/(32 x FNOM)  
24 to 40MHz  
xFS = MID  
1/(16 x FNOM)  
40 to 80MHz  
xFS = HIGH  
1/(8 x FNOM)  
80 to 160MHz  
Comments  
TimingUnitCalculation(tU)  
VCOFrequencyRange(FNOM)(1,2)  
SkewAdjustmentRange(3)  
MaxAdjustment:  
±7.8125ns  
±67.5°  
±18.75%  
tU = 1.25ns  
tU =0.833ns  
—
±9.375ns  
±135°  
±37.5%  
—
±9.375ns  
±270°  
±75%  
—
ns  
PhaseDegrees  
% of Cycle Time  
Example 1, FNOM = 25MHz  
Example 2, FNOM = 37.5MHz  
Example 3, FNOM = 50MHz  
Example 4, FNOM = 75MHz  
Example 5, FNOM = 100MHz  
Example 6, FNOM = 150MHz  
—
—
tU = 1.25ns  
tU =0.833ns  
—
—
—
—
—
tU = 1.25ns  
tU =0.833ns  
—
—
NOTES:  
1. The device may be operated outside recommended frequency ranges without damage, but functional operation is not guaranteed.  
2. The level to be set on xFS is determined by the nominal operating frequency of the VCO and Time Unit Generator. The VCO frequency always appears at x1Q1:0, x2Q1:0, and  
the higher outputs when they are operated in their undivided modes. The frequency appearing at the REF and xFB inputs will be FNOM when the output connected to xFB is  
undivided and xDS[1:0] = MM. The frequency of the REF and xFB inputs will be FNOM /2 or FNOM /4 when the part is configured for frequency multiplication by using a divided  
output as the xFB input and setting xDS[1:0] = MM. Using the xDS[1:0] inputs allows a different method for frequency multiplication (see Divide Selection Table).  
3. Skew adjustment range assumes that a zero skew output is used for feedback. If a skewed xQ output is used for feedback, then adjustment range will be greater. For example  
if a 4tU skewed output is used for feedback, all other outputs will be skewed –4tU in addition to whatever skew value is programmed for those outputs. ‘Max adjustment’ range  
applies to output pairs 3 and 4 where ±6tU skew adjustment is possible and at the lowest FNOM value.  
4
IDT5T9955  
INDUSTRIALTEMPERATURERANGE  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
DIVIDESELECTIONTABLE  
(1)  
xDS[1:0]  
LL  
xFB Divide-by-n  
Permitted Output Divide-by-n connected to xFBIN  
2
3
1 or 2  
1
LM  
LH  
4
1, 2, or 4  
1 or 2  
1, 2, or 4  
1 or 2  
1 or 2  
1
ML  
5
MM  
M H  
HL  
1
6
8
H M  
H H  
10  
12  
1
NOTE:  
1. Permissible output division ratios connected to xFB. The frequency of the REF input will be FNOM/N when the part is configured for frequency multiplication by using an undivided  
output for xFB and setting xDS[1:0] to N (N = 1-6, 8, 10, 12).  
CONTROLSUMMARYTABLEFORFEEDBACKSIGNALS  
xnF1:0  
LL(1)  
LM  
Skew (Pair #1, #2)  
Skew (Pair #3)  
Skew (Pair #4)  
Divide by 2  
–6tU  
–4tU  
–3tU  
Divide by 2  
–6tU  
LH  
–2tU  
–4tU  
–4tU  
ML  
–1tU  
–2tU  
–2tU  
MM  
M H  
HL  
Zero Skew  
1tU  
Zero Skew  
2tU  
Zero Skew  
2tU  
2tU  
4tU  
4tU  
H M  
H H  
3tU  
6tU  
6tU  
Inverted(2)  
4tU  
Divide by 4  
NOTES:  
1. LL disables outputs if TEST = MID and xsOE = HIGH.  
2. When pair #4 is set to HH (inverted), xsOE disables pair #4 HIGH when xPE = HIGH, xsOE disables pair #4 LOW when xPE = LOW.  
RECOMMENDEDOPERATINGRANGE  
Symbol  
VDD/VDDQ  
TA  
Description  
Min.  
2.3  
Typ.  
2.5  
Max.  
Unit  
V
Power Supply Voltage  
AmbientOperatingTemperature  
2.7  
-40  
+25  
+85  
°C  
5
IDT5T9955  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
INDUSTRIALTEMPERATURERANGE  
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE  
Symbol  
Parameter  
Conditions(1)  
Guaranteed Logic HIGH (REF, xFB Inputs Only)  
Guaranteed Logic LOW (REF, xFB Inputs Only)  
3-Level Inputs Only  
Min.  
Max.  
Unit  
V
VIH  
Input HIGH Voltage  
2
—
—
0.7  
VIL  
InputLOWVoltage  
V
VIHH  
VIMM  
VILL  
IIN  
Input HIGH Voltage(2)  
InputMIDVoltage(2)  
InputLOWVoltage(2)  
InputLeakageCurrent  
(REF, xFB Inputs Only)  
VDD−0.4  
VDD/2−0.2  
—
—
V
3-Level Inputs Only  
VDD/2+0.2  
0.4  
V
3-Level Inputs Only  
V
VIN = VDD or GND  
−5  
+5  
μA  
VDD = Max.  
VIN = VDD  
HIGH Level  
MID Level  
LOW Level  
—
−100  
−400  
−25  
—
+400  
+100  
—
I3  
3-LevelInputDCCurrent  
VIN = VDD/2  
μA  
(TEST, xFS, xnF[1:0], xDS[1:0])  
Input Pull-Up Current (xPE, xPD)  
Input Pull-Down Current (xsOE)  
Output HIGH Voltage  
VIN = GND  
IPU  
IPD  
VDD = Max., VIN = GND  
VDD = Max., VIN = VDD  
—
μA  
μA  
V
+100  
—
VOH  
VDD = Min., IOH = −2mA (xLOCK Output)  
VDDQ = Min., IOH = −12mA (xnQ[1:0] Outputs)  
VDD = Min., IOL = 2mA (xLOCK Output)  
VDDQ = Min., IOL = 12mA (xnQ[1:0] Outputs)  
2
2
—
VOL  
OutputLOWVoltage  
—
0.4  
0.4  
V
—
NOTES:  
1. All conditions apply to A and B banks.  
2. These inputs are normally wired to VDD, GND, or unconnected. Internal termination resistors bias unconnected inputs to VDD/2. If these inputs are switched, the function and timing  
of the outputs may be glitched, and the PLL may require an additional tLOCK time before all datasheet limits are achieved.  
POWERSUPPLYCHARACTERISTICS  
Symbol  
Parameter  
TestConditions(1)  
VDD = Max., TEST = MID, REF = LOW,  
xPE = LOW, xsOE = LOW, xPD = HIGH  
FS = MID, All outputs unloaded  
VDD = Max., xPD = LOW, xsOE = LOW  
xPE = HIGH, TEST = HIGH, xFS = HIGH  
xnF[1:0] = HH, xDS[1:0] = HH  
VIN = 2.3V, VDD = Max., xPD = LOW  
TEST = HIGH  
Typ.(2)  
Max.  
Unit  
IDDQ  
Quiescent Power Supply Current  
40  
60  
mA  
IDDPD  
ΔIDD  
IDDD  
Power Down Current  
—
1
50  
60  
μA  
μA  
Power Supply Current per Input HIGH  
(REF and xFB inputs only)  
xFS = L  
190  
150  
130  
98  
290  
230  
200  
—
Dynamic Power Supply Current per Output xFS = M  
μA/MHz  
mA  
xFS = H  
xFS = L  
FVCO = 40MHz, CL = 0pF  
FVCO = 80MHz, CL = 0pF  
FVCO = 160MHz, CL = 0pF  
ITOT  
TotalPowerSupplyCurrent  
xFS = M  
xFS = H  
132  
206  
—
—
NOTES:  
1. Measurements are for divide-by-1 outputs, xnF[1:0] = MM, and xDS[1:0] = MM. All conditions apply to A and B banks.  
2. For nominal voltage and temperature.  
6
IDT5T9955  
INDUSTRIALTEMPERATURERANGE  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
INPUTTIMINGREQUIREMENTS  
Symbol  
tR, tF  
tPWC  
Description(1)  
Maximum input rise and fall times, 0.7V to 1.7V  
Input clock pulse, HIGH or LOW  
Input duty cycle  
Min.  
—
Max.  
10  
Unit  
ns/V  
ns  
2
—
DH  
10  
90  
%
xFS = LOW  
2
40  
FREF  
Referenceclockinputfrequency  
xFS = MID  
3.33  
6.67  
80  
MHz  
xFS = HIGH  
160  
NOTE:  
1. Where pulse width implied by DH is less than tPWC limit, tPWC limit applies.  
7
IDT5T9955  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
INDUSTRIALTEMPERATURERANGE  
SWITCHINGCHARACTERISTICSOVEROPERATINGRANGE  
Symbol  
FNOM  
tRPWH  
tRPWL  
tU  
Parameter  
Min.  
Typ.  
Max.  
Unit  
VCO Frequency Range  
REF Pulse Width HIGH(1)  
REF Pulse Width LOW(1)  
SeeProgrammableSkewRangeandResolutionTable  
2
2
—
—
—
—
ns  
ns  
ProgrammableSkewTimeUnit  
SeeControlSummaryTable  
tSKEWPR  
tSKEW0  
tSKEWB  
tSKEW1  
tSKEW2  
tSKEW3  
tSKEW4  
tDEV  
Zero Output Matched-Pair Skew (xnQ0, xnQ1)(2,3)  
ZeroOutputSkew(AllOutputs)(4)  
Bank Skew(5)  
Output Skew (Rise-Rise, Fall-Fall, Same Class Outputs)(6)  
OutputSkew(Rise-Fall,Nominal-Inverted,Divided-Divided)(6)  
OutputSkew(Rise-Rise,Fall-Fall,DifferentClassOutputs)(6)  
OutputSkew(Rise-Fall,Nominal-Divided,Divided-Inverted)(2)  
Device-to-Device Skew(2,7)  
Static Phase Offset (xFS = L, M, H) (FB Divide-by-n = 1, 2, 3)(8)  
Static Phase Offset (xFS = H)(7)  
Static Phase Offset (xFS = M)(7)  
Static Phase Offset (xFS = L) (xFB Divide-by-n = 1, 2, 3, 4, 5, 6)(8)  
Static Phase Offset (xFS = L) (xFB Divide-by-n = 8, 10, 12)(8)  
Output Duty Cycle Variation from 50%  
Output HIGH Time Deviation from 50%(9)  
OutputLOWTimeDeviationfrom50%(10)  
OutputRiseTime  
—
—
50  
0.1  
0.1  
0.1  
0.2  
0.15  
0.3  
—
185  
0.25  
0.35  
0.25  
0.5  
0.5  
0.9  
0.75  
0.3  
0.5  
0.7  
0.7  
1
ps  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ms  
—
—
—
—
—
—
t(φ)1-3  
−0.3  
−0.5  
−0.7  
−0.7  
−1  
−1  
—
—
t(φ)H  
—
t(φ)M  
—
t(φ)L1-6  
t(φ)L8-12  
tODCV  
tPWH  
—
—
—
1
—
1.5  
2
tPWL  
—
—
tORISE  
tOFALL  
tLOCK  
tCCJH  
0.15  
0.15  
—
0.7  
0.7  
—
1.5  
1.5  
0.5  
100  
OutputFallTime  
PLLLockTime(11,12)  
Cycle-to-CycleOutputJitter(peak-to-peak)  
(divide by 1 output frequency, xFS = H, xFB divide-by-n=1,2)  
Cycle-to-CycleOutputJitter(peak-to-peak)  
(divide by 1 output frequency, xFS = H, xFB divide-by-n=any)  
Cycle-to-CycleOutputJitter(peak-to-peak)  
(divide by 1 output frequency, xFS = M)  
Cycle-to-CycleOutputJitter(peak-to-peak)  
(divide by 1 output frequency, xFS = L, FREF > 3MHz)  
Cycle-to-CycleOutputJitter(peak-to-peak)  
(divide by 1 output frequency, xFS = L, FREF < 3MHz)  
—
—
tCCJHA  
tCCJM  
tCCJL  
—
—
—
—
—
—
—
—
150  
200  
200  
300  
ps  
tCCJLA  
NOTES:  
1. Refer to Input Timing Requirements table for more detail.  
2. Skew is the time between the earliest and the latest output transition among all outputs for which the same tU delay has been selected when all are loaded with the specified  
load.  
3. tSKEWPR is the skew between a pair of outputs (xnQ0 and xnQ1) when all sixteen outputs are selected for 0tU.  
4. tSK(0) is the skew between outputs when they are selected for 0tU.  
5. tSKEWB is the skew between outputs (xnQ0 and xnQ1) from A and B banks when they are selected for 0tU.  
6. There are 3 classes of outputs: Nominal (multiple of tU delay), Inverted (x4Q0 and x4Q1 only with x4F0 = x4F1 = HIGH), and Divided (x3Q1:0 and x4Q1:0 only in Divide-  
by-2 or Divide-by-4 mode). Test condition: xnF0:1=MM is set on unused outputs.  
7. tDEV is the output-to-output skew between any two devices operating under the same conditions (VDDQ, VDD, ambient temperature, air flow, etc.)  
8. tφ is measured with REF input rise and fall times (from 0.7V to 1.7V) of 0.5ns. Measured from 1.25V on REF to 1.25V on xFB.  
9. Measured at 1.7V.  
10. Measured at 0.7V.  
11. tLOCK is the time that is required before synchronization is achieved. This specification is valid only after VDD/VDDQ is stable and within normal operating limits. This parameter  
is measured from the application of a new signal or frequency at REF or xFB until tPD is within specified limits.  
12. Lock detector may be unreliable for input frequencies less than approximately 4MHz, or for input signals which contain significant jitter.  
8
IDT5T9955  
INDUSTRIALTEMPERATURERANGE  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
AC TEST LOADS AND WAVEFORMS  
VDDQ  
150Ω  
Output  
Output  
150Ω  
20pF  
20pF  
For LOCK output  
For all other outputs  
tOFALL  
tORISE  
1.7V  
tPWH  
VTH = 1.25V  
0.7V  
tPWL  
2.5V Output Waveform  
≤1ns  
≤1ns  
2.5V  
1.7V  
VTH = 1.25V  
0.7V  
0V  
LVTTL Input Test Waveform  
9
IDT5T9955  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
INDUSTRIALTEMPERATURERANGE  
AC TIMING DIAGRAM  
tRPWL  
tREF  
tRPWH  
REF  
FB  
Q
t(φ)  
tODCV  
tODCV  
tCCJ1-3,  
4-6, 8-12  
tSKEWPR, B  
tSKEW0, 1  
tSKEWPR, B  
tSKEW0, 1  
OTHER Q  
tSKEW2  
tSKEW2  
INVERTED Q  
tSKEW3, 4  
tSKEW3, 4  
tSKEW3, 4  
tSKEW2, 4  
REF DIVIDED BY 2  
tSKEW1, 3, 4  
REF DIVIDED BY 4  
NOTES:  
PE:  
The AC Timing Diagram applies to PE=VDD. For PE=GND, the negative edge of FB aligns with the negative edge of REF, divided outputs change on the negative edge  
of REF, and the positive edges of the divide-by-2 and the divide-by-4 signals align.  
Skew:  
The time between the earliest and the latest output transition among all outputs for which the same tU delay has been selected when all are loaded with 20pF and terminated  
with 75Ω to VDDQ/2.  
tSKEWPR:  
tSKEWB:  
tSKEW0:  
tDEV:  
The skew between a pair of outputs (xnQ0 and xnQ1) when all eight outputs are selected for 0tU.  
The skew between outputs (xnQ0 and xnQ1) from A and B banks when they are selected for 0tU.  
The skew between outputs when they are selected for 0tU  
.
The output-to-output skew between any two devices operating under the same conditions (VDDQ, VDD, ambient temperature, air flow, etc.)  
The deviation of the output from a 50% duty cycle. Output pulse width variations are included in tSKEW2 and tSKEW4 specifications.  
tODCV:  
tPWH is measured at 1.7V.  
tPWL is measured at 0.7V.  
tORISE and tOFALL are measured between 0.7V and 1.7V.  
tLOCK:  
The time that is required before synchronization is achieved. This specification is valid only after VDD/VDDQ is stable and within normal operating limits. This parameter  
is measured from the application of a new signal or frequency at REF or FB until tPD is within specified limits.  
10  
IDT5T9955  
INDUSTRIALTEMPERATURERANGE  
2.5VPROGRAMMABLESKEWDUALPLLCLOCKDRIVERTURBOCLOCKW  
ORDERINGINFORMATION  
X
XXXXX  
XX  
IDT  
Package  
Package  
Device Type  
I
-40°C to +85°C (Industrial)  
Fine Pitch Ball Grid Array  
FBGA - Green  
BF  
BFG  
5T9955  
2.5V Programmable Skew Dual PLL Clock Driver TurboClock W  
CORPORATE HEADQUARTERS  
6024 Silver Creek Valley Road  
San Jose, CA 95138  
for SALES:  
for Tech Support:  
clockhelp@idt.com  
800-345-7015 or 408-284-8200  
fax: 408-284-2775  
www.idt.com  
11  
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