9DB1904BKLF IDT [Integrated Device Technology], 9DB1904BKLF Datasheet - Page 7

• Manufacturer Part Number: 9DB1904BKLF
• Description: 19 Output Differential Buffer for PCIe Gen2 and QPI
• Manufacturer: IDT [Integrated Device Technology]

IDT
TA = T
1
I
2
3
differential 0V.
4
average cross point where Clock rising meets Clock# falling. The median cross point is used to calculate the voltage thresholds the
oscilloscope uses for the edge rate calculations.
5
edge (i.e. Clock rising and Clock# falling).
6
absolute) allowed. The intent is to limit Vcross induced modulation by setting V_cross_delta to be smaller than V_cross absolute.
Electrical Characteristics - DIF 0.7V Current Mode Differential Outputs
OH
Guaranteed by design and characterization, not 100% tested in production. IREF = VDD/(3xR
Slew rate is measured through the Vswing voltage range centered around differential 0V. This results in a +/-150mV window around
Matching applies to rising edge rate of Clock / falling edge rate of Clock#. It is measured in a +/-75mV window centered on the
Measured from differential waveform
Vcross is defined as voltage where Clock = Clock# measured on a component test board and only applies to the differential rising
The total variation of all Vcross measurements in any particular system. Note that this is a subset of V_cross_min/max (V_cross
9DB1904B
19 Output Differential Buffer for PCIe Gen2 and QPI
Crossing Voltage (abs)
®
Crossing Voltage (var)
= 6 x I
19 Output Differential Buffer for PCIe Gen2 and QPI
Slew rate matching
COM;
PARAMETER
Voltage High
Max Voltage
Voltage Low
Min Voltage
Slew rate
REF
Vswing
Supply Voltage VDD/VDDA = 3.3 V +/-5%, See Test Loads for Loading Conditions
and V
OH
= 0.7V @ Z
HSCL Output
9DBxxx Differential Test Loads
Buffer
Vcross_abs
SYMBOL
Δ -Vcross
Vswing
VHigh
Vmax
VLow
Vmin
Δ Trf
O
Trf
=50 Ω (100 Ω differential impedance).
DIF Zo ( Ω ) Iref ( Ω )
Differential Output Termination Table
Statistical measurement on single-ended signal
Rs
Rs
100
85
Measurement on single ended signal using
using oscilloscope math function. (Scope
Slew rate matching, Scope averaging on
absolute value. (Scope averaging off)
Rp
475
412
Scope averaging off
Scope averaging off
Scope averaging off
Scope averaging on
Rp
CONDITIONS
averaging on)
7
Rs ( Ω )
Differential Zo
33
27
Rp ( Ω )
43.2
50
R
). For R
-150
-300
MIN
660
300
250
1
2pF
R
1510
TYP
12.6
797
857
378
= 475 Ω (1%), I
39
57
2
7
2pF
MAX UNITS NOTES
1150
850
150
550
140
20
4
1607C—04/19/11
REF
V/ns
mV
mV
mV
mV
mV
%
= 2.32mA.
1, 2, 3
1, 2, 4
1, 2
1, 5
1, 6
1
1
1
1