Datasheet

results assume a linear transition between measurement points and are a result of the following equations: Where:
DS8921, DS8921A, DS8921AT
SNLS374C –MAY 1998–REVISED APRIL 2013 www.ti.com
Driver Switching Characteristics (continued)
SINGLE ENDED CHARACTERISTICS
Symbol Conditions Min Typ Max Units
8921 8921A 8921AT
(Figure 3 and Figure 4)
T
TLH
C
L
= 30 pF 5 8 8 9.5 ns
(Figure 7 and Figure 8)
T
THL
C
L
= 30 pF 5 8 8 9.5 ns
(Figure 7 and Figure 8)
Skew CL = 30 pF
(1)
1 5 3.5 3.5 ns
(Figure 3 and Figure 4)
(1) Difference between complementary outputs at the 50% point.
Driver Switching Characteristics
(1)
DIFFERENTIAL CHARACTERISTICS
Symbol Conditions Min Typ Max Units
8921 8921A 8921AT
T
pLH
C
L
= 30 pF 10 15 15 15 ns
(Figure 3, Figure 5, and
Figure 6)
T
pHL
C
L
= 30 pF 10 15 15 15 ns
(Figure 3, Figure 5, and
Figure 6)
|T
pLH
–T
pHL
| C
L
= 30 pF 0.5 6 2.75 2.75 ns
(Figure 3, Figure 5, and
Figure 6)
(1) Differential Delays are defined as calculated results from single ended rise and fall time measurements. This approach in establishing
AC performance specifications has been taken due to limitations of available Automatic Test Equipment (ATE). The calculated ATE
T
cr
= Crossing Point T
ra
, T
rb
, T
fa
and T
fb
are time measurements with respect to the input. See Figure 6.
AC Test Circuits and Switching Diagrams
Figure 1.
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