DS8921ATJ National Semiconductor, DS8921ATJ Datasheet - Page 3

• Manufacturer Part Number: DS8921ATJ
• Description: IC DIFF LINE DRV/REC PAIR 8CDIP
• Manufacturer: National Semiconductor
• Type: Line Transceiverr

Specifications of DS8921ATJ

• Number Of Drivers/receivers: 1/1
• Protocol: RS422
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DS8921ATJ

T
T
|T
T
T
T
T
Skew
T
T
|T
pLH
pHL
pLH
pHL
TLH
THL
pLH
pHL
pLH
pLH
Receiver Switching Characteristics
Figure 1(Figure 2)
Driver Switching Characteristics
SINGLE ENDED CHARACTERISTICS (Figures 3, 4)
Driver Switching Characteristics
DIFFERENTIAL CHARACTERISTICS (Figures 3, 5)
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 V
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
specifications 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: T
Symbol
T
ra
–T
–T
Symbol
Symbol
, T
rb
pHL
pHL
cr
, T
= Crossing Point
|
|
fa
and T
C
(Figures 3, 4)
C
(Figures 3, 4)
C
(Figures 7, 8)
C
(Figures 7, 8)
CL = 30 pF
(Figures 3, 4)
L
L
L
L
fb
= 30 pF
= 30 pF
= 30 pF
= 30 pF
are time measurements with respect to the input. See Figure 6 .
C
(Figures 1, 2 )
C
(Figures 1, 2)
C
(Figures 1, 2 )
C
(Figures 3, 5, 6)
C
(Figures 3, 5, 6)
C
(Figures 3, 5, 6)
L
L
L
Conditions
L
L
L
= 30 pF
= 30 pF
= 30 pF
= 30 pF
= 30 pF
= 30 pF
Conditions
CC
Conditions
= 5V, T
A
= 25˚C.
Min
Min
Min
(Note 6)
Typ
10
10
5
5
1
Typ
0.5
14
14
Typ
3
0.5
10
10
8921
15
15
8
8
5
8921
22.5
22.5
5
8921
15
15
6
8921A
Max
8921A
3.5
15
15
8921A
8
8
Max
2.75
3.5
20
20
15
15
Max
8921AT
8921AT
8921AT
9.5
9.5
3.5
15
15
2.75
15
15
20
20
5
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