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Switching Characteristics
(Continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 3 and 8)
Symbol
Parameter
Conditions
Reference
Min
Typ
Max
Units
RECEIVER CHARACTERISTICS
t
PHL
Propagation Delay
C
L
e
15 pF
Figures 12, 13
30
210
400
ns
High to Low
t
PLH
Propagation Delay
30
190
400
ns
Low to High
t
SK
Skew,
l
t
PHL
b
t
PLH
l
0
20
50
ns
t
PLZ
Output Disable Time
C
L
e
15 pF
Figures 14, 15, 16
Ð
50
150
ns
t
PHZ
Ð
55
150
ns
t
PZL
Output Enable Time
Ð
40
150
ns
t
PZH
Ð
45
150
ns
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 devices
should be operated at these limits. The table of ‘‘Electrical Characteristics’’ specifies conditions of device operation.
Note 2:
Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except V
OD1
and
V
OD2
.
Note 3:
All typicals are given for: V
CC
e a
5.0V, T
A
e a
25
§
C.
Note 4:
Delta
l
V
OD2
l
and Delta
l
V
OC
l
are changes in magnitude of V
OD2
and V
OC
, respectively, that occur when input changes state.
Note 5:
Threshold parameter limits specified as an algebraic value rather than by magnitude.
Note 6:
Hysteresis defined as V
HST
e
V
TH
b
V
TL
.
Note 7:
I
IN
includes the receiver input current and driver TRI-STATE leakage current.
Note 8:
C
L
includes probe and jig capacitance.
Note 9:
For complete details of test, see RS-485.
Parameter Measurement Information
TL/F/12040 – 2
FIGURE 1. Driver V
OD2
and V
OC
TL/F/12040 – 18
FIGURE 2. Driver V
OD3
TL/F/12040 – 3
FIGURE 3. Driver V
OH
and V
OL
TL/F/12040 – 4
Vtest
e b
7V to
a
12V
FIGURE 4. Driver I
OSD
TL/F/12040 – 5
FIGURE 5. Driver Differential Propagation Delay Test Circuit
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