ICS85105I
LOW SKEW, 1-TO-5, DIFFERENTIAL/LVCMOS-TO-0.7V HCSL FANOUT BUFFER
TABLE 5. AC CHARACTERISTICS, VDD = 3.3V 10ꢀ, TA = -40°C TO 85°C
Symbol Parameter
fMAX Output Frequency
Test Conditions
CLK_SEL = 0
CLK_SEL = 1
CLK_SEL = 0
CLK_SEL = 1
Minimum Typical Maximum Units
500
250
3.2
MHz
MHz
ns
2.0
2.0
tPD
Propagation Delay; NOTE 1
2.8
ns
tsk(o)
Output Skew; NOTE 2, 4
100
600
ps
tsk(pp)
Part-to-Part Skew; NOTE 3, 4
ps
Buffer Additive Phase Jitter, RMS;
refer to Additive Phase Jitter Section
Absolute Maximum Output Voltage;
NOTE 5, 10
Absolute Minimum Output Voltage;
NOTE 5, 11
tjit
100MHz (12kHz - 20MHz)
0.24
ps
VMAX
VMIN
1150
100
mV
mV
-300
VRB
Ringback Voltage; NOTE 6, 13
-100
500
250
V
tSTABLE
VCROSS
Time before VRB is allowed; NOTE 6, 13
Absolute Crossing Voltage; NOTE 5, 8, 9
ps
550
140
mV
Total Variation of VCROSS over all edges;
NOTE 5, 8, 12
ΔVCROSS
mV
Measured between
-150mV to +150mV
Rise/Fall Edge Rate; NOTE 6, 7
0.6
45
5.5
55
V/ns
ꢀ
odc
Output Duty Cycle; NOTE 14
All parameters measured at IJ 250MHz unless noted otherwise.
NOTE 1: Measured from the VDD/2 of the input to the differential output crossing point.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at the output
differential cross points.
NOTE 3: Defined as skew between outputs on different devices operating at the same supply voltage, same temperature, and with
equal load conditions. Using the same type of inputs on each device, the outputs are measured at the differential cross points.
NOTE 4: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 5: Measurement taken from single-ended waveform.
NOTE 6: Measurement taken from differential waveform.
NOTE 7: Measured from -150mV to +150mV on the differential waveform (derived from Qx minus nQx). The signal must be
monotonic through the measurement region for rise and fall time. The 300mV measurement window is centered on the differential
zero crossing. See Parameter Measurement Information Section.
NOTE 8: Measured at crossing point where the instantaneous voltage value of the rising edge of Qx equals the falling edge of nQx.
See Parameter Measurement Information Section.
NOTE 9: Refers to the total variation from the lowest crossing point to the highest, regardless of which edge is crossing. Refers to all
crossing points for this measurement. See Parameter Measurement Information Section.
NOTE 10: Defined as the maximum instantaneous voltage including overshoot. See Parameter Measurement Information Section.
NOTE 11: Defined as the minimum instantaneous voltage including undershoot. See Parameter Measurement Information Section.
NOTE 12: Defined as the total variation of all crossing voltage of Rising Qx and Falling nQx. This is the maximum allowed variance
in the VCROSS for any particular system. See Parameter Measurement Information Section.
NOTE: 13. TSTABLE is the time the differential clock must maintain a minimum 150mV differential voltage after rising/falling edges
before it is allowed to droop back into the VRB 100mV differential range. See Parameter Measurement Information Section.
NOTE 14: Input duty cycle must be 50ꢀ.
IDT™ / ICS™ 0.7V HCSL FANOUT BUFFER
5
ICS85105AGI REV. A JUNE 5, 2008
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