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DS8921 Datasheet(Fiches technique) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numéro de pièce DS8921
Description  Differential Line Driver and Receiver Pair
Télécharger  8 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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Receiver Switching Characteristics
Figure 1(Figure 2)
Symbol
Conditions
Min
Typ
Max
Units
8921
8921A
8921AT
T
pLH
C
L = 30 pF
14
22.5
20
20
ns
(
Figures 1, 2 )
T
pHL
C
L = 30 pF
14
22.5
20
20
ns
(
Figures 1, 2)
|T
pLH–T pHL|CL = 30 pF
0.5
5
3.5
5
ns
(
Figures 1, 2 )
Driver Switching Characteristics
SINGLE ENDED CHARACTERISTICS (
Figures 3, 4)
Symbol
Conditions
Min
Typ
Max
Units
8921
8921A
8921AT
T
pLH
C
L = 30 pF
10
15
15
15
ns
(
Figures 3, 4)
T
pHL
C
L = 30 pF
10
15
15
15
ns
(
Figures 3, 4)
T
TLH
C
L = 30 pF
5
8
8
9.5
ns
(
Figures 7, 8)
T
THL
C
L = 30 pF
5
8
8
9.5
ns
(
Figures 7, 8)
Skew
CL = 30 pF
1
5
3.5
3.5
ns
(
Figures 3, 4)
Driver Switching Characteristics(Note 6)
DIFFERENTIAL CHARACTERISTICS (
Figures 3, 5)
Symbol
Conditions
Min
Typ
Max
Units
8921
8921A
8921AT
T
pLH
C
L = 30 pF
10
15
15
15
ns
(
Figures 3, 5, 6)
T
pHL
C
L = 30 pF
10
15
15
15
ns
(
Figures 3, 5, 6)
|T
pLH–T pHL|CL = 30 pF
0.5
6
2.75
2.75
ns
(
Figures 3, 5, 6)
Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device
should be operated at these limits. The Table of “Electrical Characteristics” provides conditions for actual device operation.
Note 2: All currents into device pins are shown as positive values; all currents out of the device are shown as negative; all voltages are referenced to ground unless
otherwise specified. All values shown as max or min are classified on absolute value basis.
Note 3: All typical values are VCC = 5V, TA = 25˚C.
Note 4: Only one output at a time should be shorted.
Note 5: Difference between complementary outputs at the 50% point.
Note 6: Differential Delays are defined as calculated results from single ended rise and fall time measurements. This approach in establishing AC performance speci-
fications has been taken due to limitations of available Automatic Test Equipment (ATE).
The calculated ATE results assume a linear transition between measurement points and are a result of the following equations:
Where: Tcr = Crossing Point
Tra,Trb,Tfa and T fb are time measurements with respect to the input. See Figure 6 .
www.national.com
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