
IDT Programmable Timing Control Hub for Intel Based Systems
1602E—04/29/11
ICS9LRS3187B
Programmable Timing Control Hub for Intel Based Systems
14
Datasheet
AC Electrical Characteristics - Low Power Differential Outputs, Industrial Temperature Range
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS NOTES
Rising Edge Slew Rate
tSLR
Averaging on
2.5
3.7
4.2
V/ns
2, 3
Falling Edge Slew Rate
tFLR
Averaging on
2.5
3.7
4.2
V/ns
2, 3
Slew Rate Variation
tSLVAR
Averaging on
12.2
20
%
1, 6
Differential Voltage Swing
VSWING
Averaging off
300
mV
2
Crossing Point Voltage
VXABS
Averaging off
300
447
550
mV
1,4,5
Crossing Point Variation
VXABSVAR
Averaging off
19
140
mV
1,4,9
Maximum Output Voltage
VHIGH
Averaging off
941
1150
mV
1,7
Minimum Output Voltage
VLOW
Averaging off
-300
-43
mV
1,8
Duty Cycle
DCYC
Averaging on
45
49.8
55
%
2
CPU Skew
tSKEWCPU
Averaging on
35
100
ps
SRC Skew
tSKEWSRC
Averaging on, SRC to SATA skew when Byte0, bit 1 = 0
288
350
ps
1Measurement taken for single ended waveform on a component test board (not in system)
2 Measurement taken from differential waveform on a component test board. (not in system)
3 Slew rate measured through mimimum V_swing voltage range centered about differential zero
4 Vcross is defined at the voltage where Clock = Clock#, measured on a component test board (not in system)
NOTES: (unless otherwise noted, guaranteed by design and characterization, not 100% tested in production). CL = 2pF, Rs = 0 ohms.
5 Only applies to the differential rising edge (Clock rising, Clock# falling)
6 Matching applies to rising edge rate for Clock and falling edge rate for Clock#. It is measured using a +/-75mV window centered on the average cross point where
Clock rising meets Clock# falling. The median cross point is used to calculate the voltage
7 The max voltage including overshoot.
8 The min voltage including undershoot.
9 The total variation of all Vcross measurements in any particular system. Note this is a subset of V_cross min/max (V_Cross absolute) allowed. The intent is to
limit Vcross induced modulation by setting C_cross_delta to be smaller than V_Cross absolute
Clock Jitter Specifications - Low Power Differential Outputs, Industrial Temperature Range
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS NOTES
CPU Jitter - Cycle to Cycle
CPUJC2C
Differential Measurement
55
85
ps
1
SRC Jitter - Cycle to Cycle
SRCJC2C
Differential Measurement
55
125
ps
1
SATA Jitter - Cycle to Cycle
SATAJC2C
Differential Measurement
55
125
ps
1
DOT Jitter - Cycle to Cycle
DOTJC2C
Differential Measurement
55
250
ps
1
tjphasePLL
PCIe Gen 1
45
86
ps (p-p)
1,2,3
tjphaseLo
PCIe Gen 2
10kHz < f < 1.5MHz
23
ps
(RMS)
1,2,3
tjphaseHigh
PCIe Gen 2
1.5MHz < f < Nyquist (50MHz)
2.6
3.1
ps
(RMS)
1,2,3
1JItter specs are specified as measured on a clock characterization board. System designers need to take special care not to use these numbers, as the in-system
performance will be somewhat degraded. The receiver EMTS (chispet or CPU) will have the receiver jitter specs as measured in a real system.
2 Phase jitter requirement: The designated Gen2 outputs will meet the reference clock jitter requirements from the PCI Express Gen2 Base Spec. The test is
performed on a component test board under quiet conditions with all outputs on.
SRC Phase Jitter
3See http://www.pcisig.com for complete specs
NOTES: (unless otherwise noted, guaranteed by design and characterization, not 100% tested in production). CL = 2pF, Rs = 0 ohms.