Datasheet

C
L
(see Note A)
TEST CIRCUIT
S1
2
×
Open
GND
R
L
R
L
V
OH
V
OL
VOLTAGE WAVEFORMS
OUTPUT SKEW (t
sk(o)
)
Data Out at
YB
1
or YB
2
50 Ω
V
G1
V
DD
V
SEL
V
SEL
V
DD
V
DD
V
DD
/2
0
DUT
50 Ω
50 Ω
V
G2
50 Ω
V
I
TEST
R
L
S1 C
L
1.5 V to 2 V
V
DD
t
sk(p)
t
sk(o)
1.5 V to 2 V
Open
Open
200 Ω
200 Ω
V or GND
DD
V or GND
DD
10 pF
10 pF
Input Generator
Input Generator
V
O
(V
OH
+ V
OL
)/2
V
OH
V
OL
Data Out at
XB
1
or XB
2
(V
OH
+ V
OL
)/2
Data In at
Ax or Ay
t
PLHx
t
PHLx
t
sk(o)
t
sk(o)
t
PLHy
t
PHLy
t
sk(o)
= t
PLHy
- t
PLHx
or t
PHLy
- t
PHLx
V
OH
V
OL
VOLTAGE WAVEFORMS
PULSE SKEW [t
sk(p)
]
Output
(V
OH
+ V
OL
)/2
Input
V
DD
/2
t
PLH
t
PHL
t
sk(p)
= t
PHL
- t
PLH
V
DD
V
O
V
I
V
O
TS2PCIE412
www.ti.com SCDS269C –MARCH 2009–REVISED APRIL 2010
PARAMETER MEASUREMENT INFORMATION
(Skew)
A. C
L
includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output
control. Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the
output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z
O
= 50 Ω, t
r
≤ 2.5
ns, t
f
≤2.5 ns.
D. The outputs are measured one at a time, with one transition per measurement.
Figure 7. Test Circuit and Voltage Waveforms
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